init: agent event bus + state
structure: state/CURRENT.md — 2-4 line session state (rewritten each session) events/ — json event bus (pull-based, optional context) persistent/ — important decisions (one doc per decision) emit — helper script for emitting events
This commit is contained in:
commit
75168f7678
1
.gitignore
vendored
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1
.gitignore
vendored
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# no ignores, track everything
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18
emit
Executable file
18
emit
Executable file
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#!/usr/bin/env bash
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# Emit an event to the agent event bus
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# Usage: emit <agent> <action> <subject> [summary]
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# Example: emit clawdbot deployed discord-feed-bots "5 feeds live"
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AGENT="${1:?usage: emit <agent> <action> <subject> [summary]}"
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ACTION="${2:?}"
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SUBJECT="${3:?}"
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SUMMARY="${4:-}"
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TIMESTAMP=$(date -u +%Y-%m-%dT%H:%M:%SZ)
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EPOCH=$(date +%s)
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FILE="$HOME/.agents/events/${EPOCH}-${AGENT}-${ACTION}-${SUBJECT}.json"
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cat > "$FILE" << EOF
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{"agent":"$AGENT","action":"$ACTION","subject":"$SUBJECT","summary":"$SUMMARY","timestamp":"$TIMESTAMP"}
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EOF
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echo "$FILE"
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{"agent":"clawdbot","action":"configured","subject":"discord-server","summary":"feeds category, server category, welcome + announcements channels","timestamp":"2026-01-24T10:27:05Z"}
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@ -0,0 +1 @@
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{"agent":"clawdbot","action":"deployed","subject":"discord-feed-bots","summary":"reddit, github, twitter, claude releases, weekly trends — systemd timers + webhooks","timestamp":"2026-01-24T10:27:05Z"}
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@ -0,0 +1 @@
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{"agent":"clawdbot","action":"installed","subject":"audio-separator","summary":"UVR5 stem splitting + yt-dlp","timestamp":"2026-01-24T10:27:05Z"}
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1
events/1769250425-clawdbot-installed-image-gen.json
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1
events/1769250425-clawdbot-installed-image-gen.json
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{"agent":"clawdbot","action":"installed","subject":"image-gen","summary":"gemini-3-pro-image-preview via google AI","timestamp":"2026-01-24T10:27:05Z"}
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1
events/1769250425-clawdbot-setup-agent-event-bus.json
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1
events/1769250425-clawdbot-setup-agent-event-bus.json
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{"agent":"clawdbot","action":"setup","subject":"agent-event-bus","summary":"~/.agents/ with state, events, persistent","timestamp":"2026-01-24T10:27:05Z"}
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85
skills/ask-questions-if-underspecified/SKILL.md
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85
skills/ask-questions-if-underspecified/SKILL.md
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---
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name: ask-questions-if-underspecified
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description: Clarify requirements before implementing. Use when serious doubts araise.
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---
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# Ask Questions If Underspecified
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## When to Use
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Use this skill when a request has multiple plausible interpretations or key details (objective, scope, constraints, environment, or safety) are unclear.
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## When NOT to Use
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Do not use this skill when the request is already clear, or when a quick, low-risk discovery read can answer the missing details.
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## Goal
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Ask the minimum set of clarifying questions needed to avoid wrong work; do not start implementing until the must-have questions are answered (or the user explicitly approves proceeding with stated assumptions).
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## Workflow
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### 1) Decide whether the request is underspecified
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Treat a request as underspecified if after exploring how to perform the work, some or all of the following are not clear:
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- Define the objective (what should change vs stay the same)
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- Define "done" (acceptance criteria, examples, edge cases)
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- Define scope (which files/components/users are in/out)
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- Define constraints (compatibility, performance, style, deps, time)
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- Identify environment (language/runtime versions, OS, build/test runner)
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- Clarify safety/reversibility (data migration, rollout/rollback, risk)
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If multiple plausible interpretations exist, assume it is underspecified.
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### 2) Ask must-have questions first (keep it small)
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Ask 1-5 questions in the first pass. Prefer questions that eliminate whole branches of work.
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Make questions easy to answer:
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- Optimize for scannability (short, numbered questions; avoid paragraphs)
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- Offer multiple-choice options when possible
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- Suggest reasonable defaults when appropriate (mark them clearly as the default/recommended choice; bold the recommended choice in the list, or if you present options in a code block, put a bold "Recommended" line immediately above the block and also tag defaults inside the block)
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- Include a fast-path response (e.g., reply `defaults` to accept all recommended/default choices)
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- Include a low-friction "not sure" option when helpful (e.g., "Not sure - use default")
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- Separate "Need to know" from "Nice to know" if that reduces friction
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- Structure options so the user can respond with compact decisions (e.g., `1b 2a 3c`); restate the chosen options in plain language to confirm
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### 3) Pause before acting
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Until must-have answers arrive:
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- Do not run commands, edit files, or produce a detailed plan that depends on unknowns
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- Do perform a clearly labeled, low-risk discovery step only if it does not commit you to a direction (e.g., inspect repo structure, read relevant config files)
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If the user explicitly asks you to proceed without answers:
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- State your assumptions as a short numbered list
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- Ask for confirmation; proceed only after they confirm or correct them
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### 4) Confirm interpretation, then proceed
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Once you have answers, restate the requirements in 1-3 sentences (including key constraints and what success looks like), then start work.
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## Question templates
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- "Before I start, I need: (1) ..., (2) ..., (3) .... If you don't care about (2), I will assume ...."
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- "Which of these should it be? A) ... B) ... C) ... (pick one)"
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- "What would you consider 'done'? For example: ..."
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- "Any constraints I must follow (versions, performance, style, deps)? If none, I will target the existing project defaults."
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- Use numbered questions with lettered options and a clear reply format
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```text
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1) Scope?
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a) Minimal change (default)
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b) Refactor while touching the area
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c) Not sure - use default
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2) Compatibility target?
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a) Current project defaults (default)
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b) Also support older versions: <specify>
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c) Not sure - use default
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Reply with: defaults (or 1a 2a)
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```
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## Anti-patterns
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- Don't ask questions you can answer with a quick, low-risk discovery read (e.g., configs, existing patterns, docs).
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- Don't ask open-ended questions if a tight multiple-choice or yes/no would eliminate ambiguity faster.
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428
skills/kpi-dashboard-design/SKILL.md
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428
skills/kpi-dashboard-design/SKILL.md
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---
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name: kpi-dashboard-design
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description: Design effective KPI dashboards with metrics selection, visualization best practices, and real-time monitoring patterns. Use when building business dashboards, selecting metrics, or designing data visualization layouts.
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---
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# KPI Dashboard Design
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Comprehensive patterns for designing effective Key Performance Indicator (KPI) dashboards that drive business decisions.
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## When to Use This Skill
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- Designing executive dashboards
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- Selecting meaningful KPIs
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- Building real-time monitoring displays
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- Creating department-specific metrics views
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- Improving existing dashboard layouts
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- Establishing metric governance
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## Core Concepts
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### 1. KPI Framework
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| Level | Focus | Update Frequency | Audience |
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| --------------- | ---------------- | ----------------- | ---------- |
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| **Strategic** | Long-term goals | Monthly/Quarterly | Executives |
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| **Tactical** | Department goals | Weekly/Monthly | Managers |
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| **Operational** | Day-to-day | Real-time/Daily | Teams |
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### 2. SMART KPIs
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```
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Specific: Clear definition
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Measurable: Quantifiable
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Achievable: Realistic targets
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Relevant: Aligned to goals
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Time-bound: Defined period
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```
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### 3. Dashboard Hierarchy
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```
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├── Executive Summary (1 page)
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│ ├── 4-6 headline KPIs
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│ ├── Trend indicators
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│ └── Key alerts
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├── Department Views
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│ ├── Sales Dashboard
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│ ├── Marketing Dashboard
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│ ├── Operations Dashboard
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│ └── Finance Dashboard
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└── Detailed Drilldowns
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├── Individual metrics
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└── Root cause analysis
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```
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## Common KPIs by Department
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### Sales KPIs
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```yaml
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Revenue Metrics:
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- Monthly Recurring Revenue (MRR)
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- Annual Recurring Revenue (ARR)
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- Average Revenue Per User (ARPU)
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- Revenue Growth Rate
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Pipeline Metrics:
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- Sales Pipeline Value
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- Win Rate
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- Average Deal Size
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- Sales Cycle Length
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Activity Metrics:
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- Calls/Emails per Rep
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- Demos Scheduled
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- Proposals Sent
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- Close Rate
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```
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### Marketing KPIs
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```yaml
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Acquisition:
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- Cost Per Acquisition (CPA)
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- Customer Acquisition Cost (CAC)
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- Lead Volume
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- Marketing Qualified Leads (MQL)
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|
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Engagement:
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- Website Traffic
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- Conversion Rate
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- Email Open/Click Rate
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- Social Engagement
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ROI:
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- Marketing ROI
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- Campaign Performance
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- Channel Attribution
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- CAC Payback Period
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```
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### Product KPIs
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```yaml
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Usage:
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- Daily/Monthly Active Users (DAU/MAU)
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- Session Duration
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- Feature Adoption Rate
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- Stickiness (DAU/MAU)
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Quality:
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- Net Promoter Score (NPS)
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- Customer Satisfaction (CSAT)
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- Bug/Issue Count
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- Time to Resolution
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Growth:
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- User Growth Rate
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- Activation Rate
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- Retention Rate
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- Churn Rate
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```
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### Finance KPIs
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```yaml
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Profitability:
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- Gross Margin
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- Net Profit Margin
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- EBITDA
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- Operating Margin
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|
||||
Liquidity:
|
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- Current Ratio
|
||||
- Quick Ratio
|
||||
- Cash Flow
|
||||
- Working Capital
|
||||
|
||||
Efficiency:
|
||||
- Revenue per Employee
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- Operating Expense Ratio
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- Days Sales Outstanding
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- Inventory Turnover
|
||||
```
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||||
## Dashboard Layout Patterns
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### Pattern 1: Executive Summary
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|
||||
```
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┌─────────────────────────────────────────────────────────────┐
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│ EXECUTIVE DASHBOARD [Date Range ▼] │
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├─────────────┬─────────────┬─────────────┬─────────────────┤
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│ REVENUE │ PROFIT │ CUSTOMERS │ NPS SCORE │
|
||||
│ $2.4M │ $450K │ 12,450 │ 72 │
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│ ▲ 12% │ ▲ 8% │ ▲ 15% │ ▲ 5pts │
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├─────────────┴─────────────┴─────────────┴─────────────────┤
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│ │
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│ Revenue Trend │ Revenue by Product │
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│ ┌───────────────────────┐ │ ┌──────────────────┐ │
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│ │ /\ /\ │ │ │ ████████ 45% │ │
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||||
│ │ / \ / \ /\ │ │ │ ██████ 32% │ │
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||||
│ │ / \/ \ / \ │ │ │ ████ 18% │ │
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||||
│ │ / \/ \ │ │ │ ██ 5% │ │
|
||||
│ └───────────────────────┘ │ └──────────────────┘ │
|
||||
│ │
|
||||
├─────────────────────────────────────────────────────────────┤
|
||||
│ 🔴 Alert: Churn rate exceeded threshold (>5%) │
|
||||
│ 🟡 Warning: Support ticket volume 20% above average │
|
||||
└─────────────────────────────────────────────────────────────┘
|
||||
```
|
||||
|
||||
### Pattern 2: SaaS Metrics Dashboard
|
||||
|
||||
```
|
||||
┌─────────────────────────────────────────────────────────────┐
|
||||
│ SAAS METRICS Jan 2024 [Monthly ▼] │
|
||||
├──────────────────────┬──────────────────────────────────────┤
|
||||
│ ┌────────────────┐ │ MRR GROWTH │
|
||||
│ │ MRR │ │ ┌────────────────────────────────┐ │
|
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│ │ $125,000 │ │ │ /── │ │
|
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│ │ ▲ 8% │ │ │ /────/ │ │
|
||||
│ └────────────────┘ │ │ /────/ │ │
|
||||
│ ┌────────────────┐ │ │ /────/ │ │
|
||||
│ │ ARR │ │ │ /────/ │ │
|
||||
│ │ $1,500,000 │ │ └────────────────────────────────┘ │
|
||||
│ │ ▲ 15% │ │ J F M A M J J A S O N D │
|
||||
│ └────────────────┘ │ │
|
||||
├──────────────────────┼──────────────────────────────────────┤
|
||||
│ UNIT ECONOMICS │ COHORT RETENTION │
|
||||
│ │ │
|
||||
│ CAC: $450 │ Month 1: ████████████████████ 100% │
|
||||
│ LTV: $2,700 │ Month 3: █████████████████ 85% │
|
||||
│ LTV/CAC: 6.0x │ Month 6: ████████████████ 80% │
|
||||
│ │ Month 12: ██████████████ 72% │
|
||||
│ Payback: 4 months │ │
|
||||
├──────────────────────┴──────────────────────────────────────┤
|
||||
│ CHURN ANALYSIS │
|
||||
│ ┌──────────┬──────────┬──────────┬──────────────────────┐ │
|
||||
│ │ Gross │ Net │ Logo │ Expansion │ │
|
||||
│ │ 4.2% │ 1.8% │ 3.1% │ 2.4% │ │
|
||||
│ └──────────┴──────────┴──────────┴──────────────────────┘ │
|
||||
└─────────────────────────────────────────────────────────────┘
|
||||
```
|
||||
|
||||
### Pattern 3: Real-time Operations
|
||||
|
||||
```
|
||||
┌─────────────────────────────────────────────────────────────┐
|
||||
│ OPERATIONS CENTER Live ● Last: 10:42:15 │
|
||||
├────────────────────────────┬────────────────────────────────┤
|
||||
│ SYSTEM HEALTH │ SERVICE STATUS │
|
||||
│ ┌──────────────────────┐ │ │
|
||||
│ │ CPU MEM DISK │ │ ● API Gateway Healthy │
|
||||
│ │ 45% 72% 58% │ │ ● User Service Healthy │
|
||||
│ │ ███ ████ ███ │ │ ● Payment Service Degraded │
|
||||
│ │ ███ ████ ███ │ │ ● Database Healthy │
|
||||
│ │ ███ ████ ███ │ │ ● Cache Healthy │
|
||||
│ └──────────────────────┘ │ │
|
||||
├────────────────────────────┼────────────────────────────────┤
|
||||
│ REQUEST THROUGHPUT │ ERROR RATE │
|
||||
│ ┌──────────────────────┐ │ ┌──────────────────────────┐ │
|
||||
│ │ ▁▂▃▄▅▆▇█▇▆▅▄▃▂▁▂▃▄▅ │ │ │ ▁▁▁▁▁▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁ │ │
|
||||
│ └──────────────────────┘ │ └──────────────────────────┘ │
|
||||
│ Current: 12,450 req/s │ Current: 0.02% │
|
||||
│ Peak: 18,200 req/s │ Threshold: 1.0% │
|
||||
├────────────────────────────┴────────────────────────────────┤
|
||||
│ RECENT ALERTS │
|
||||
│ 10:40 🟡 High latency on payment-service (p99 > 500ms) │
|
||||
│ 10:35 🟢 Resolved: Database connection pool recovered │
|
||||
│ 10:22 🔴 Payment service circuit breaker tripped │
|
||||
└─────────────────────────────────────────────────────────────┘
|
||||
```
|
||||
|
||||
## Implementation Patterns
|
||||
|
||||
### SQL for KPI Calculations
|
||||
|
||||
```sql
|
||||
-- Monthly Recurring Revenue (MRR)
|
||||
WITH mrr_calculation AS (
|
||||
SELECT
|
||||
DATE_TRUNC('month', billing_date) AS month,
|
||||
SUM(
|
||||
CASE subscription_interval
|
||||
WHEN 'monthly' THEN amount
|
||||
WHEN 'yearly' THEN amount / 12
|
||||
WHEN 'quarterly' THEN amount / 3
|
||||
END
|
||||
) AS mrr
|
||||
FROM subscriptions
|
||||
WHERE status = 'active'
|
||||
GROUP BY DATE_TRUNC('month', billing_date)
|
||||
)
|
||||
SELECT
|
||||
month,
|
||||
mrr,
|
||||
LAG(mrr) OVER (ORDER BY month) AS prev_mrr,
|
||||
(mrr - LAG(mrr) OVER (ORDER BY month)) / LAG(mrr) OVER (ORDER BY month) * 100 AS growth_pct
|
||||
FROM mrr_calculation;
|
||||
|
||||
-- Cohort Retention
|
||||
WITH cohorts AS (
|
||||
SELECT
|
||||
user_id,
|
||||
DATE_TRUNC('month', created_at) AS cohort_month
|
||||
FROM users
|
||||
),
|
||||
activity AS (
|
||||
SELECT
|
||||
user_id,
|
||||
DATE_TRUNC('month', event_date) AS activity_month
|
||||
FROM user_events
|
||||
WHERE event_type = 'active_session'
|
||||
)
|
||||
SELECT
|
||||
c.cohort_month,
|
||||
EXTRACT(MONTH FROM age(a.activity_month, c.cohort_month)) AS months_since_signup,
|
||||
COUNT(DISTINCT a.user_id) AS active_users,
|
||||
COUNT(DISTINCT a.user_id)::FLOAT / COUNT(DISTINCT c.user_id) * 100 AS retention_rate
|
||||
FROM cohorts c
|
||||
LEFT JOIN activity a ON c.user_id = a.user_id
|
||||
AND a.activity_month >= c.cohort_month
|
||||
GROUP BY c.cohort_month, EXTRACT(MONTH FROM age(a.activity_month, c.cohort_month))
|
||||
ORDER BY c.cohort_month, months_since_signup;
|
||||
|
||||
-- Customer Acquisition Cost (CAC)
|
||||
SELECT
|
||||
DATE_TRUNC('month', acquired_date) AS month,
|
||||
SUM(marketing_spend) / NULLIF(COUNT(new_customers), 0) AS cac,
|
||||
SUM(marketing_spend) AS total_spend,
|
||||
COUNT(new_customers) AS customers_acquired
|
||||
FROM (
|
||||
SELECT
|
||||
DATE_TRUNC('month', u.created_at) AS acquired_date,
|
||||
u.id AS new_customers,
|
||||
m.spend AS marketing_spend
|
||||
FROM users u
|
||||
JOIN marketing_spend m ON DATE_TRUNC('month', u.created_at) = m.month
|
||||
WHERE u.source = 'marketing'
|
||||
) acquisition
|
||||
GROUP BY DATE_TRUNC('month', acquired_date);
|
||||
```
|
||||
|
||||
### Python Dashboard Code (Streamlit)
|
||||
|
||||
```python
|
||||
import streamlit as st
|
||||
import pandas as pd
|
||||
import plotly.express as px
|
||||
import plotly.graph_objects as go
|
||||
|
||||
st.set_page_config(page_title="KPI Dashboard", layout="wide")
|
||||
|
||||
# Header with date filter
|
||||
col1, col2 = st.columns([3, 1])
|
||||
with col1:
|
||||
st.title("Executive Dashboard")
|
||||
with col2:
|
||||
date_range = st.selectbox(
|
||||
"Period",
|
||||
["Last 7 Days", "Last 30 Days", "Last Quarter", "YTD"]
|
||||
)
|
||||
|
||||
# KPI Cards
|
||||
def metric_card(label, value, delta, prefix="", suffix=""):
|
||||
delta_color = "green" if delta >= 0 else "red"
|
||||
delta_arrow = "▲" if delta >= 0 else "▼"
|
||||
st.metric(
|
||||
label=label,
|
||||
value=f"{prefix}{value:,.0f}{suffix}",
|
||||
delta=f"{delta_arrow} {abs(delta):.1f}%"
|
||||
)
|
||||
|
||||
col1, col2, col3, col4 = st.columns(4)
|
||||
with col1:
|
||||
metric_card("Revenue", 2400000, 12.5, prefix="$")
|
||||
with col2:
|
||||
metric_card("Customers", 12450, 15.2)
|
||||
with col3:
|
||||
metric_card("NPS Score", 72, 5.0)
|
||||
with col4:
|
||||
metric_card("Churn Rate", 4.2, -0.8, suffix="%")
|
||||
|
||||
# Charts
|
||||
col1, col2 = st.columns(2)
|
||||
|
||||
with col1:
|
||||
st.subheader("Revenue Trend")
|
||||
revenue_data = pd.DataFrame({
|
||||
'Month': pd.date_range('2024-01-01', periods=12, freq='M'),
|
||||
'Revenue': [180000, 195000, 210000, 225000, 240000, 255000,
|
||||
270000, 285000, 300000, 315000, 330000, 345000]
|
||||
})
|
||||
fig = px.line(revenue_data, x='Month', y='Revenue',
|
||||
line_shape='spline', markers=True)
|
||||
fig.update_layout(height=300)
|
||||
st.plotly_chart(fig, use_container_width=True)
|
||||
|
||||
with col2:
|
||||
st.subheader("Revenue by Product")
|
||||
product_data = pd.DataFrame({
|
||||
'Product': ['Enterprise', 'Professional', 'Starter', 'Other'],
|
||||
'Revenue': [45, 32, 18, 5]
|
||||
})
|
||||
fig = px.pie(product_data, values='Revenue', names='Product',
|
||||
hole=0.4)
|
||||
fig.update_layout(height=300)
|
||||
st.plotly_chart(fig, use_container_width=True)
|
||||
|
||||
# Cohort Heatmap
|
||||
st.subheader("Cohort Retention")
|
||||
cohort_data = pd.DataFrame({
|
||||
'Cohort': ['Jan', 'Feb', 'Mar', 'Apr', 'May'],
|
||||
'M0': [100, 100, 100, 100, 100],
|
||||
'M1': [85, 87, 84, 86, 88],
|
||||
'M2': [78, 80, 76, 79, None],
|
||||
'M3': [72, 74, 70, None, None],
|
||||
'M4': [68, 70, None, None, None],
|
||||
})
|
||||
fig = go.Figure(data=go.Heatmap(
|
||||
z=cohort_data.iloc[:, 1:].values,
|
||||
x=['M0', 'M1', 'M2', 'M3', 'M4'],
|
||||
y=cohort_data['Cohort'],
|
||||
colorscale='Blues',
|
||||
text=cohort_data.iloc[:, 1:].values,
|
||||
texttemplate='%{text}%',
|
||||
textfont={"size": 12},
|
||||
))
|
||||
fig.update_layout(height=250)
|
||||
st.plotly_chart(fig, use_container_width=True)
|
||||
|
||||
# Alerts Section
|
||||
st.subheader("Alerts")
|
||||
alerts = [
|
||||
{"level": "error", "message": "Churn rate exceeded threshold (>5%)"},
|
||||
{"level": "warning", "message": "Support ticket volume 20% above average"},
|
||||
]
|
||||
for alert in alerts:
|
||||
if alert["level"] == "error":
|
||||
st.error(f"🔴 {alert['message']}")
|
||||
elif alert["level"] == "warning":
|
||||
st.warning(f"🟡 {alert['message']}")
|
||||
```
|
||||
|
||||
## Best Practices
|
||||
|
||||
### Do's
|
||||
|
||||
- **Limit to 5-7 KPIs** - Focus on what matters
|
||||
- **Show context** - Comparisons, trends, targets
|
||||
- **Use consistent colors** - Red=bad, green=good
|
||||
- **Enable drilldown** - From summary to detail
|
||||
- **Update appropriately** - Match metric frequency
|
||||
|
||||
### Don'ts
|
||||
|
||||
- **Don't show vanity metrics** - Focus on actionable data
|
||||
- **Don't overcrowd** - White space aids comprehension
|
||||
- **Don't use 3D charts** - They distort perception
|
||||
- **Don't hide methodology** - Document calculations
|
||||
- **Don't ignore mobile** - Ensure responsive design
|
||||
|
||||
## Resources
|
||||
|
||||
- [Stephen Few's Dashboard Design](https://www.perceptualedge.com/articles/visual_business_intelligence/rules_for_using_color.pdf)
|
||||
- [Edward Tufte's Principles](https://www.edwardtufte.com/tufte/)
|
||||
- [Google Data Studio Gallery](https://datastudio.google.com/gallery)
|
||||
331
skills/meme-factory/SKILL.md
Normal file
331
skills/meme-factory/SKILL.md
Normal file
@ -0,0 +1,331 @@
|
||||
---
|
||||
name: meme-factory
|
||||
description: Generate memes using the memegen.link API. Use when users request memes, want to add humor to content, or need visual aids for social media. Supports 100+ popular templates with custom text and styling.
|
||||
---
|
||||
|
||||
# Meme Factory
|
||||
|
||||
Create memes using the free memegen.link API and textual meme formats.
|
||||
|
||||
---
|
||||
|
||||
## Triggers
|
||||
|
||||
| Trigger | Description |
|
||||
|---------|-------------|
|
||||
| `/meme-factory` | Manual invocation |
|
||||
| `/meme-factory {template} {top} {bottom}` | Direct meme generation |
|
||||
| `meme-factory: create a meme about X` | Natural language request |
|
||||
|
||||
---
|
||||
|
||||
## Quick Reference
|
||||
|
||||
| Action | Format |
|
||||
|--------|--------|
|
||||
| Basic meme | `https://api.memegen.link/images/{template}/{top}/{bottom}.png` |
|
||||
| With sizing | `?width=1200&height=630` |
|
||||
| Custom background | `?style=https://example.com/image.jpg` |
|
||||
| All templates | https://api.memegen.link/templates/ |
|
||||
| Interactive docs | https://api.memegen.link/docs/ |
|
||||
|
||||
**Additional Resources:**
|
||||
- [Markdown Memes Guide](references/markdown-memes-guide.md) - 15+ textual meme formats
|
||||
- [Examples](references/examples.md) - Practical usage examples
|
||||
- [meme_generator.py](scripts/meme_generator.py) - Python helper script
|
||||
|
||||
---
|
||||
|
||||
## Quick Start
|
||||
|
||||
### Basic Meme Structure
|
||||
|
||||
```
|
||||
https://api.memegen.link/images/{template}/{top_text}/{bottom_text}.{extension}
|
||||
```
|
||||
|
||||
**Example:**
|
||||
```
|
||||
https://api.memegen.link/images/buzz/memes/memes_everywhere.png
|
||||
```
|
||||
|
||||
Result: Buzz Lightyear meme with "memes" at top and "memes everywhere" at bottom.
|
||||
|
||||
### Text Formatting
|
||||
|
||||
| Character | Encoding |
|
||||
|-----------|----------|
|
||||
| Space | `_` or `-` |
|
||||
| Newline | `~n` |
|
||||
| Question mark | `~q` |
|
||||
| Percent | `~p` |
|
||||
| Slash | `~s` |
|
||||
| Hash | `~h` |
|
||||
| Single quote | `''` |
|
||||
| Double quote | `""` |
|
||||
|
||||
---
|
||||
|
||||
## Popular Templates
|
||||
|
||||
| Template | Use Case | Example |
|
||||
|----------|----------|---------|
|
||||
| `buzz` | X, X everywhere | bugs/bugs_everywhere |
|
||||
| `drake` | Comparisons | manual_testing/automated_testing |
|
||||
| `success` | Victories | deployed/no_errors |
|
||||
| `fine` | Things going wrong | server_on_fire/this_is_fine |
|
||||
| `fry` | Uncertainty | not_sure_if_bug/or_feature |
|
||||
| `changemind` | Hot takes | tabs_are_better_than_spaces |
|
||||
| `distracted` | Priorities | my_code/new_framework/current_project |
|
||||
| `mordor` | One does not simply | one_does_not_simply/deploy_on_friday |
|
||||
|
||||
---
|
||||
|
||||
## Template Selection Guide
|
||||
|
||||
| Context | Template | Why |
|
||||
|---------|----------|-----|
|
||||
| Comparing options | `drake` | Two-panel reject/approve format |
|
||||
| Celebrating wins | `success` | Positive outcome emphasis |
|
||||
| Problems ignored | `fine` | Ironic "everything is fine" |
|
||||
| Uncertainty | `fry` | "Not sure if X or Y" format |
|
||||
| Controversial opinion | `changemind` | Statement + challenge |
|
||||
| Ubiquitous things | `buzz` | "X, X everywhere" |
|
||||
| Bad ideas | `mordor` | "One does not simply..." |
|
||||
|
||||
---
|
||||
|
||||
## Validation
|
||||
|
||||
After generating a meme:
|
||||
|
||||
- [ ] URL returns valid image (test in browser)
|
||||
- [ ] Text is readable (not too long)
|
||||
- [ ] Template matches the message context
|
||||
- [ ] Special characters properly encoded
|
||||
- [ ] Dimensions appropriate for platform
|
||||
|
||||
### Platform Dimensions
|
||||
|
||||
| Platform | Dimensions |
|
||||
|----------|------------|
|
||||
| Social media (Open Graph) | 1200x630 |
|
||||
| Slack/Discord | 800x600 |
|
||||
| GitHub | Default |
|
||||
|
||||
---
|
||||
|
||||
## Anti-Patterns
|
||||
|
||||
| Avoid | Why | Instead |
|
||||
|-------|-----|---------|
|
||||
| Spaces without encoding | URL breaks | Use `_` or `-` |
|
||||
| Too much text | Unreadable | 2-6 words per line |
|
||||
| Wrong template | Message mismatch | Match template to context |
|
||||
| Missing extension | Invalid URL | Always include `.png`, `.jpg`, etc. |
|
||||
| Unencoded special chars | URL breaks | Use `~q`, `~s`, `~p`, etc. |
|
||||
| Assuming template exists | 404 error | Check templates list first |
|
||||
|
||||
---
|
||||
|
||||
## Verification
|
||||
|
||||
Meme generation is successful when:
|
||||
|
||||
1. **URL is valid** - Returns HTTP 200
|
||||
2. **Image renders** - Displays correctly in markdown
|
||||
3. **Text is visible** - Properly formatted on image
|
||||
4. **Context matches** - Template fits the message
|
||||
|
||||
**Test command:**
|
||||
```bash
|
||||
curl -I "https://api.memegen.link/images/buzz/test/test.png"
|
||||
# Should return: HTTP/2 200
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
<details>
|
||||
<summary><strong>Deep Dive: Advanced Features</strong></summary>
|
||||
|
||||
### Image Formats
|
||||
|
||||
| Extension | Use Case |
|
||||
|-----------|----------|
|
||||
| `.png` | Best quality, default |
|
||||
| `.jpg` | Smaller file size |
|
||||
| `.webp` | Modern, good compression |
|
||||
| `.gif` | Animated templates |
|
||||
|
||||
### Dimensions
|
||||
|
||||
```
|
||||
?width=800
|
||||
?height=600
|
||||
?width=800&height=600 (padded to exact)
|
||||
```
|
||||
|
||||
### Layout Options
|
||||
|
||||
```
|
||||
?layout=top # Text at top only
|
||||
?layout=bottom # Text at bottom only
|
||||
?layout=default # Standard top/bottom
|
||||
```
|
||||
|
||||
### Custom Fonts
|
||||
|
||||
View available: https://api.memegen.link/fonts/
|
||||
|
||||
```
|
||||
?font=impact (default)
|
||||
```
|
||||
|
||||
### Custom Images
|
||||
|
||||
Use any image as background:
|
||||
|
||||
```
|
||||
https://api.memegen.link/images/custom/hello/world.png?style=https://example.com/image.jpg
|
||||
```
|
||||
|
||||
</details>
|
||||
|
||||
<details>
|
||||
<summary><strong>Deep Dive: Contextual Memes</strong></summary>
|
||||
|
||||
### Code Reviews
|
||||
|
||||
```
|
||||
Template: fry
|
||||
https://api.memegen.link/images/fry/not_sure_if_feature/or_bug.png
|
||||
```
|
||||
|
||||
### Deployments
|
||||
|
||||
```
|
||||
Template: interesting
|
||||
https://api.memegen.link/images/interesting/i_dont_always_test/but_when_i_do_i_do_it_in_production.png
|
||||
```
|
||||
|
||||
### Documentation
|
||||
|
||||
```
|
||||
Template: yodawg
|
||||
https://api.memegen.link/images/yodawg/yo_dawg_i_heard_you_like_docs/so_i_documented_the_documentation.png
|
||||
```
|
||||
|
||||
### Performance Issues
|
||||
|
||||
```
|
||||
Template: fine
|
||||
https://api.memegen.link/images/fine/memory_usage_at_99~/this_is_fine.png
|
||||
```
|
||||
|
||||
### Successful Deploy
|
||||
|
||||
```
|
||||
Template: success
|
||||
https://api.memegen.link/images/success/deployed_to_production/zero_downtime.png
|
||||
```
|
||||
|
||||
</details>
|
||||
|
||||
<details>
|
||||
<summary><strong>Deep Dive: Workflow Integration</strong></summary>
|
||||
|
||||
### Generating Memes in Response
|
||||
|
||||
```markdown
|
||||
Here's a relevant meme:
|
||||
|
||||
|
||||
```
|
||||
|
||||
### Dynamic Generation (Python)
|
||||
|
||||
```python
|
||||
def generate_status_meme(status: str, message: str):
|
||||
template_map = {
|
||||
"success": "success",
|
||||
"failure": "fine",
|
||||
"review": "fry",
|
||||
"deploy": "interesting"
|
||||
}
|
||||
|
||||
template = template_map.get(status, "buzz")
|
||||
words = message.split()
|
||||
top = "_".join(words[0:3])
|
||||
bottom = "_".join(words[3:6])
|
||||
|
||||
return f"https://api.memegen.link/images/{template}/{top}/{bottom}.png"
|
||||
```
|
||||
|
||||
### Using the Helper Script
|
||||
|
||||
```python
|
||||
from meme_generator import MemeGenerator
|
||||
|
||||
meme = MemeGenerator()
|
||||
url = meme.generate("buzz", "features", "features everywhere")
|
||||
print(url)
|
||||
```
|
||||
|
||||
</details>
|
||||
|
||||
<details>
|
||||
<summary><strong>Deep Dive: API Reference</strong></summary>
|
||||
|
||||
### Endpoints
|
||||
|
||||
| Endpoint | Purpose |
|
||||
|----------|---------|
|
||||
| `/templates/` | List all templates |
|
||||
| `/templates/{id}` | Template details |
|
||||
| `/fonts/` | Available fonts |
|
||||
| `/images/{template}/{top}/{bottom}.{ext}` | Generate meme |
|
||||
|
||||
### API Characteristics
|
||||
|
||||
- Free and open-source
|
||||
- No API key required
|
||||
- No rate limiting (normal use)
|
||||
- Stateless (all info in URL)
|
||||
- Images generated on-demand
|
||||
|
||||
### Error Handling
|
||||
|
||||
1. Check template at https://api.memegen.link/templates/
|
||||
2. Verify text formatting (underscores for spaces)
|
||||
3. Check special character encoding
|
||||
4. Ensure valid extension
|
||||
5. Test URL in browser
|
||||
|
||||
</details>
|
||||
|
||||
---
|
||||
|
||||
## References
|
||||
|
||||
| Document | Content |
|
||||
|----------|---------|
|
||||
| [markdown-memes-guide.md](references/markdown-memes-guide.md) | 15+ textual meme formats (greentext, copypasta, ASCII, etc.) |
|
||||
| [examples.md](references/examples.md) | Practical usage examples |
|
||||
|
||||
### Scripts
|
||||
|
||||
| Script | Purpose |
|
||||
|--------|---------|
|
||||
| [meme_generator.py](scripts/meme_generator.py) | Python helper for meme generation |
|
||||
|
||||
---
|
||||
|
||||
## Summary
|
||||
|
||||
Generate contextual memes to:
|
||||
- Add humor to conversations
|
||||
- Create social media visuals
|
||||
- Make code reviews engaging
|
||||
- Celebrate successes
|
||||
|
||||
**Golden rule:** Keep text concise, match template to context.
|
||||
457
skills/meme-factory/references/examples.md
Normal file
457
skills/meme-factory/references/examples.md
Normal file
@ -0,0 +1,457 @@
|
||||
# Meme Generation Examples
|
||||
|
||||
This document provides practical examples of using the meme generation skill in various contexts.
|
||||
|
||||
## Basic Examples
|
||||
|
||||
### Example 1: Simple Meme
|
||||
|
||||
**Request:**
|
||||
"Create a meme about bugs everywhere"
|
||||
|
||||
**Response:**
|
||||
```
|
||||
Here's a Buzz Lightyear meme about bugs:
|
||||
|
||||
|
||||
```
|
||||
|
||||
### Example 2: Drake Comparison Meme
|
||||
|
||||
**Request:**
|
||||
"Make a Drake meme comparing manual testing vs automated testing"
|
||||
|
||||
**Response:**
|
||||
```
|
||||
Here's a Drake meme comparing testing approaches:
|
||||
|
||||
|
||||
```
|
||||
|
||||
### Example 3: Success Meme
|
||||
|
||||
**Request:**
|
||||
"Generate a success kid meme about all tests passing"
|
||||
|
||||
**Response:**
|
||||
```
|
||||
Here's a success meme:
|
||||
|
||||
|
||||
```
|
||||
|
||||
## Programming Examples
|
||||
|
||||
### Python Script Example
|
||||
|
||||
```python
|
||||
from meme_generator import MemeGenerator
|
||||
|
||||
# Initialize generator
|
||||
meme = MemeGenerator()
|
||||
|
||||
# Generate a basic meme
|
||||
url = meme.generate(
|
||||
template="buzz",
|
||||
top_text="features",
|
||||
bottom_text="features everywhere"
|
||||
)
|
||||
print(f"Meme URL: {url}")
|
||||
|
||||
# Generate with custom dimensions for social media
|
||||
url = meme.generate(
|
||||
template="drake",
|
||||
top_text="writing tests later",
|
||||
bottom_text="writing tests first",
|
||||
width=1200,
|
||||
height=630
|
||||
)
|
||||
print(f"Social media meme: {url}")
|
||||
|
||||
# Get markdown for embedding
|
||||
markdown = meme.get_markdown_image(url, alt_text="TDD Meme")
|
||||
print(f"Markdown: {markdown}")
|
||||
```
|
||||
|
||||
### CLI Example
|
||||
|
||||
```bash
|
||||
# Generate a basic meme
|
||||
python meme_generator.py generate buzz "features" "features everywhere"
|
||||
|
||||
# Generate with markdown output
|
||||
python meme_generator.py generate success "deployed" "no errors" --markdown
|
||||
|
||||
# Generate with custom dimensions
|
||||
python meme_generator.py generate drake "old way" "new way" --width 1200 --height 630
|
||||
|
||||
# List all available templates
|
||||
python meme_generator.py list-templates
|
||||
|
||||
# Suggest template for context
|
||||
python meme_generator.py suggest "deployment success"
|
||||
```
|
||||
|
||||
## Context-Specific Examples
|
||||
|
||||
### Code Review Context
|
||||
|
||||
**Scenario:** Reviewing pull request with many changes
|
||||
|
||||
```python
|
||||
# Not sure if improvements or over-engineering
|
||||
url = meme.generate("fry", "not sure if improvements", "or over engineering")
|
||||
```
|
||||
|
||||
**Result:**
|
||||
```
|
||||
https://api.memegen.link/images/fry/not_sure_if_improvements/or_over_engineering.png
|
||||
```
|
||||
|
||||
### Deployment Context
|
||||
|
||||
**Scenario:** Successful production deployment
|
||||
|
||||
```python
|
||||
# Success kid meme
|
||||
url = meme.generate("success", "deployed to production", "zero downtime")
|
||||
```
|
||||
|
||||
**Result:**
|
||||
```
|
||||
https://api.memegen.link/images/success/deployed_to_production/zero_downtime.png
|
||||
```
|
||||
|
||||
### Incident Response Context
|
||||
|
||||
**Scenario:** Production fire
|
||||
|
||||
```python
|
||||
# This is fine meme
|
||||
url = meme.generate("fine", "production is down", "this is fine")
|
||||
```
|
||||
|
||||
**Result:**
|
||||
```
|
||||
https://api.memegen.link/images/fine/production_is_down/this_is_fine.png
|
||||
```
|
||||
|
||||
### Documentation Context
|
||||
|
||||
**Scenario:** Documentation improvements
|
||||
|
||||
```python
|
||||
# Yo dawg meme
|
||||
url = meme.generate(
|
||||
"yodawg",
|
||||
"yo dawg i heard you like docs",
|
||||
"so i documented the documentation"
|
||||
)
|
||||
```
|
||||
|
||||
**Result:**
|
||||
```
|
||||
https://api.memegen.link/images/yodawg/yo_dawg_i_heard_you_like_docs/so_i_documented_the_documentation.png
|
||||
```
|
||||
|
||||
## Advanced Examples
|
||||
|
||||
### Custom Dimensions for Social Media
|
||||
|
||||
**Open Graph (1200x630)**
|
||||
|
||||
```python
|
||||
url = meme.generate(
|
||||
"buzz",
|
||||
"features",
|
||||
"features everywhere",
|
||||
width=1200,
|
||||
height=630
|
||||
)
|
||||
```
|
||||
|
||||
### Custom Layout
|
||||
|
||||
**Top-only text**
|
||||
|
||||
```python
|
||||
url = meme.generate(
|
||||
"rollsafe",
|
||||
"cant have bugs in production",
|
||||
layout="top"
|
||||
)
|
||||
```
|
||||
|
||||
### Multiple Format Generation
|
||||
|
||||
```python
|
||||
formats = ["png", "jpg", "webp"]
|
||||
for fmt in formats:
|
||||
url = meme.generate(
|
||||
"success",
|
||||
"all tests passing",
|
||||
"first try",
|
||||
extension=fmt
|
||||
)
|
||||
print(f"{fmt.upper()}: {url}")
|
||||
```
|
||||
|
||||
## Integration Examples
|
||||
|
||||
### Slack Bot Integration
|
||||
|
||||
```python
|
||||
def send_deployment_meme(channel: str, status: str):
|
||||
"""Send a meme to Slack based on deployment status."""
|
||||
meme = MemeGenerator()
|
||||
|
||||
if status == "success":
|
||||
url = meme.generate("success", "deployed", "no errors")
|
||||
message = "Deployment successful!"
|
||||
elif status == "failure":
|
||||
url = meme.generate("fine", "deployment failed", "this is fine")
|
||||
message = "Deployment needs attention"
|
||||
else:
|
||||
url = meme.generate("fry", "not sure if deployed", "or still deploying")
|
||||
message = "Deployment status unclear"
|
||||
|
||||
# Send to Slack (pseudo-code)
|
||||
slack_client.chat_postMessage(
|
||||
channel=channel,
|
||||
text=message,
|
||||
attachments=[{"image_url": url}]
|
||||
)
|
||||
```
|
||||
|
||||
### GitHub PR Comments
|
||||
|
||||
```python
|
||||
def comment_pr_review(pr_number: int, review_type: str):
|
||||
"""Add a meme to PR comments based on review."""
|
||||
meme = MemeGenerator()
|
||||
|
||||
review_memes = {
|
||||
"approved": meme.generate("success", "lgtm", "ship it"),
|
||||
"changes_requested": meme.generate("yuno", "y u no", "write tests"),
|
||||
"complex": meme.generate("fry", "not sure if feature", "or bug")
|
||||
}
|
||||
|
||||
url = review_memes.get(review_type)
|
||||
markdown = meme.get_markdown_image(url, alt_text="Code Review Meme")
|
||||
|
||||
# Post comment (pseudo-code)
|
||||
github_client.issues.create_comment(
|
||||
pr_number,
|
||||
f"Code review complete!\n\n{markdown}"
|
||||
)
|
||||
```
|
||||
|
||||
### Discord Bot Integration
|
||||
|
||||
```python
|
||||
@bot.command()
|
||||
async def deploy_meme(ctx, status: str):
|
||||
"""Generate deployment meme for Discord."""
|
||||
meme = MemeGenerator()
|
||||
|
||||
if status == "success":
|
||||
url = meme.generate("success", "deployed", "zero downtime")
|
||||
elif status == "fail":
|
||||
url = meme.generate("fine", "servers on fire", "this is fine")
|
||||
|
||||
await ctx.send(f"Deployment Status: {status}")
|
||||
await ctx.send(url)
|
||||
```
|
||||
|
||||
## Batch Generation Examples
|
||||
|
||||
### Generate Multiple Memes for a Topic
|
||||
|
||||
```python
|
||||
def generate_testing_memes():
|
||||
"""Generate a collection of testing-related memes."""
|
||||
meme = MemeGenerator()
|
||||
|
||||
memes = [
|
||||
meme.generate("drake", "manual testing", "automated testing"),
|
||||
meme.generate("success", "all tests passing", "on first try"),
|
||||
meme.generate("fry", "not sure if bug", "or feature"),
|
||||
meme.generate("interesting", "i dont always test", "but when i do i test in production"),
|
||||
]
|
||||
|
||||
print("Testing Meme Collection:\n")
|
||||
for i, url in enumerate(memes, 1):
|
||||
print(f"{i}. {url}")
|
||||
|
||||
generate_testing_memes()
|
||||
```
|
||||
|
||||
### Generate Memes for Documentation
|
||||
|
||||
```python
|
||||
def generate_docs_memes():
|
||||
"""Generate documentation-related memes."""
|
||||
meme = MemeGenerator()
|
||||
|
||||
topics = [
|
||||
("yodawg", "yo dawg i heard you like docs", "so i documented your docs"),
|
||||
("buzz", "documentation", "documentation everywhere"),
|
||||
("wonka", "oh you write documentation", "tell me more about this fantasy"),
|
||||
("ancient", "documentation", "documentation"),
|
||||
]
|
||||
|
||||
for template, top, bottom in topics:
|
||||
url = meme.generate(template, top, bottom)
|
||||
markdown = meme.get_markdown_image(url)
|
||||
print(markdown)
|
||||
|
||||
generate_docs_memes()
|
||||
```
|
||||
|
||||
## Error Handling Examples
|
||||
|
||||
### Check Template Validity
|
||||
|
||||
```python
|
||||
def generate_safe_meme(template: str, top: str, bottom: str):
|
||||
"""Generate meme with error handling."""
|
||||
meme = MemeGenerator()
|
||||
|
||||
# Check if template exists
|
||||
if template not in meme.TEMPLATES:
|
||||
print(f"Warning: '{template}' not in known templates")
|
||||
print(f"Falling back to 'buzz'")
|
||||
template = "buzz"
|
||||
|
||||
url = meme.generate(template, top, bottom)
|
||||
return url
|
||||
```
|
||||
|
||||
### Context-Based Template Selection
|
||||
|
||||
```python
|
||||
def smart_meme_generation(context: str, top: str, bottom: str):
|
||||
"""Generate meme with automatic template selection."""
|
||||
meme = MemeGenerator()
|
||||
|
||||
# Suggest template based on context
|
||||
suggested_template = meme.suggest_template_for_context(context)
|
||||
|
||||
print(f"Context: {context}")
|
||||
print(f"Suggested template: {suggested_template}")
|
||||
|
||||
url = meme.generate(suggested_template, top, bottom)
|
||||
return url
|
||||
|
||||
# Examples
|
||||
url1 = smart_meme_generation("deployment success", "deployed", "no errors")
|
||||
url2 = smart_meme_generation("debugging nightmare", "bugs", "bugs everywhere")
|
||||
url3 = smart_meme_generation("code comparison", "old code", "new code")
|
||||
```
|
||||
|
||||
## Tips for Effective Memes
|
||||
|
||||
### Good Examples
|
||||
|
||||
```python
|
||||
# ✅ Concise text
|
||||
meme.generate("buzz", "bugs", "bugs everywhere")
|
||||
|
||||
# ✅ Relevant template
|
||||
meme.generate("drake", "manual work", "automation")
|
||||
|
||||
# ✅ Clear message
|
||||
meme.generate("success", "deployed", "zero errors")
|
||||
```
|
||||
|
||||
### Bad Examples
|
||||
|
||||
```python
|
||||
# ❌ Too much text
|
||||
meme.generate(
|
||||
"buzz",
|
||||
"there are way too many bugs in this codebase",
|
||||
"seriously there are bugs absolutely everywhere i look"
|
||||
)
|
||||
|
||||
# ❌ Wrong template choice
|
||||
meme.generate("success", "production is down", "servers crashed") # Should use 'fine'
|
||||
|
||||
# ❌ Unclear message
|
||||
meme.generate("buzz", "stuff", "things")
|
||||
```
|
||||
|
||||
## Testing Your Memes
|
||||
|
||||
```python
|
||||
def test_meme_generation():
|
||||
"""Test meme generation with various inputs."""
|
||||
meme = MemeGenerator()
|
||||
|
||||
test_cases = [
|
||||
("buzz", "test", "test everywhere", "png"),
|
||||
("drake", "bugs", "features", "jpg"),
|
||||
("success", "deployed", "working", "webp"),
|
||||
]
|
||||
|
||||
print("Testing meme generation:\n")
|
||||
for template, top, bottom, ext in test_cases:
|
||||
url = meme.generate(template, top, bottom, extension=ext)
|
||||
print(f"✓ {template} ({ext}): {url}")
|
||||
|
||||
test_meme_generation()
|
||||
```
|
||||
|
||||
## Real-World Workflow Example
|
||||
|
||||
```python
|
||||
def deployment_workflow_with_memes(deployment_result: dict):
|
||||
"""Complete deployment workflow with contextual memes."""
|
||||
meme = MemeGenerator()
|
||||
|
||||
# Pre-deployment
|
||||
pre_deploy = meme.generate("buzz", "deployments", "deployments incoming")
|
||||
print(f"Pre-deployment: {pre_deploy}")
|
||||
|
||||
# During deployment
|
||||
if deployment_result["status"] == "in_progress":
|
||||
during = meme.generate("fry", "not sure if deploying", "or already deployed")
|
||||
print(f"During: {during}")
|
||||
|
||||
# Post-deployment
|
||||
if deployment_result["success"]:
|
||||
post = meme.generate(
|
||||
"success",
|
||||
"deployed to production",
|
||||
"zero downtime",
|
||||
width=1200,
|
||||
height=630
|
||||
)
|
||||
slack_message = f"Deployment successful! {post}"
|
||||
else:
|
||||
post = meme.generate("fine", "deployment failed", "this is fine")
|
||||
slack_message = f"Deployment needs attention: {post}"
|
||||
|
||||
print(f"Post-deployment: {slack_message}")
|
||||
|
||||
# Example usage
|
||||
deployment_workflow_with_memes({
|
||||
"status": "completed",
|
||||
"success": True,
|
||||
"duration": "5m 32s"
|
||||
})
|
||||
```
|
||||
|
||||
## Summary
|
||||
|
||||
These examples demonstrate:
|
||||
- Basic meme generation
|
||||
- Context-aware template selection
|
||||
- Integration with popular platforms
|
||||
- Error handling and validation
|
||||
- Batch generation workflows
|
||||
- Real-world use cases
|
||||
|
||||
For more examples and templates, visit:
|
||||
- https://api.memegen.link/docs/
|
||||
- https://api.memegen.link/templates/
|
||||
1082
skills/meme-factory/references/markdown-memes-guide.md
Normal file
1082
skills/meme-factory/references/markdown-memes-guide.md
Normal file
File diff suppressed because it is too large
Load Diff
244
skills/meme-factory/scripts/meme_generator.py
Normal file
244
skills/meme-factory/scripts/meme_generator.py
Normal file
@ -0,0 +1,244 @@
|
||||
#!/usr/bin/env python3
|
||||
"""Meme Generator Helper.
|
||||
|
||||
A Python interface for the memegen.link API to generate memes programmatically.
|
||||
|
||||
Usage:
|
||||
python meme_generator.py generate buzz "memes" "memes everywhere"
|
||||
python meme_generator.py list-templates
|
||||
python meme_generator.py suggest "deployment success"
|
||||
|
||||
Or import as a module:
|
||||
from meme_generator import MemeGenerator
|
||||
meme = MemeGenerator()
|
||||
url = meme.generate("buzz", "hello", "world")
|
||||
"""
|
||||
|
||||
import argparse
|
||||
import urllib.parse
|
||||
|
||||
|
||||
class MemeGenerator:
|
||||
"""Generate memes using the memegen.link API."""
|
||||
|
||||
BASE_URL = "https://api.memegen.link"
|
||||
|
||||
# Popular templates with their use cases
|
||||
TEMPLATES = {
|
||||
"buzz": "X, X everywhere (Buzz Lightyear)",
|
||||
"drake": "Comparing two options (Drake Hotline Bling)",
|
||||
"success": "Celebrating wins (Success Kid)",
|
||||
"fine": "Things going wrong (This is Fine Dog)",
|
||||
"fry": "Uncertainty (Futurama Fry)",
|
||||
"changemind": "Controversial opinions (Change My Mind)",
|
||||
"distracted": "Priorities/distractions (Distracted Boyfriend)",
|
||||
"yodawg": "Yo dawg, I heard you like X (Xzibit)",
|
||||
"interesting": "I don't always X (Most Interesting Man)",
|
||||
"mordor": "One does not simply X (Boromir)",
|
||||
"yuno": "Y U NO (Y U NO Guy)",
|
||||
"doge": "Much X, very Y (Doge)",
|
||||
"wonka": "Condescending statements (Wonka)",
|
||||
"ancient": "Aliens/conspiracy (Ancient Aliens Guy)",
|
||||
"skeptical": "Skeptical reactions (Third World Skeptical Kid)",
|
||||
"awesome": "Good/bad situations (Awesome/Awkward Penguin)",
|
||||
"rollsafe": "Can't X if Y (Roll Safe)",
|
||||
"surprised": "Surprised reactions (Surprised Pikachu)",
|
||||
"thinking": "Thinking/pondering (Thinking Guy)",
|
||||
"boardroom": "Bad suggestions (Boardroom Meeting)",
|
||||
}
|
||||
|
||||
# Context-based template suggestions
|
||||
CONTEXT_MAP = {
|
||||
"success": ["success", "awesome"],
|
||||
"failure": ["fine", "yuno"],
|
||||
"comparison": ["drake", "awesome", "distracted"],
|
||||
"uncertainty": ["fry", "suspicious"],
|
||||
"statement": ["buzz", "yodawg", "interesting", "mordor", "changemind"],
|
||||
"reaction": ["success", "fine", "surprised", "thinking"],
|
||||
"humor": ["doge", "wonka", "ancient", "rollsafe"],
|
||||
"deployment": ["success", "fine", "interesting"],
|
||||
"testing": ["success", "fry", "interesting"],
|
||||
"debugging": ["fine", "fry", "buzz"],
|
||||
"documentation": ["yodawg", "buzz", "wonka"],
|
||||
}
|
||||
|
||||
def __init__(self) -> None:
|
||||
"""Initialize the meme generator."""
|
||||
|
||||
def _format_text(self, text: str) -> str:
|
||||
"""Format text for URL inclusion following memegen rules."""
|
||||
replacements = {
|
||||
" ": "_",
|
||||
"-": "--",
|
||||
"_": "__",
|
||||
"?": "~q",
|
||||
"%": "~p",
|
||||
"#": "~h",
|
||||
"/": "~s",
|
||||
'"': "''",
|
||||
}
|
||||
|
||||
escaped = "".join(replacements.get(char, char) for char in text)
|
||||
|
||||
# Percent-encode any remaining reserved characters while preserving
|
||||
# memegen's escape sequences and allowed characters.
|
||||
return urllib.parse.quote(escaped, safe="-_~")
|
||||
|
||||
def generate( # noqa: PLR0913
|
||||
self,
|
||||
template: str,
|
||||
top_text: str = "",
|
||||
bottom_text: str = "",
|
||||
extension: str = "png",
|
||||
width: int | None = None,
|
||||
height: int | None = None,
|
||||
layout: str | None = None,
|
||||
style: str | None = None,
|
||||
font: str | None = None,
|
||||
) -> str:
|
||||
"""Generate a meme URL.
|
||||
|
||||
Args:
|
||||
template: Template name (e.g., 'buzz', 'drake')
|
||||
top_text: Text for the top of the meme
|
||||
bottom_text: Text for the bottom of the meme
|
||||
extension: Image format ('png', 'jpg', 'webp', 'gif')
|
||||
width: Optional width in pixels
|
||||
height: Optional height in pixels
|
||||
layout: Optional layout ('top', 'bottom', 'default')
|
||||
style: Optional style or custom background URL
|
||||
font: Optional font name
|
||||
|
||||
Returns:
|
||||
URL to the generated meme
|
||||
|
||||
"""
|
||||
# Format text
|
||||
top = self._format_text(top_text) if top_text else "_"
|
||||
bottom = self._format_text(bottom_text) if bottom_text else "_"
|
||||
|
||||
# Build base URL
|
||||
url = f"{self.BASE_URL}/images/{template}/{top}/{bottom}.{extension}"
|
||||
|
||||
# Add query parameters
|
||||
params = {}
|
||||
if width:
|
||||
params["width"] = str(width)
|
||||
if height:
|
||||
params["height"] = str(height)
|
||||
if layout:
|
||||
params["layout"] = layout
|
||||
if style:
|
||||
params["style"] = style
|
||||
if font:
|
||||
params["font"] = font
|
||||
|
||||
if params:
|
||||
query_string = urllib.parse.urlencode(params)
|
||||
url = f"{url}?{query_string}"
|
||||
|
||||
return url
|
||||
|
||||
def suggest_template_for_context(self, context: str) -> str:
|
||||
"""Suggest a template based on context.
|
||||
|
||||
Args:
|
||||
context: Description of the situation (e.g., 'deployment success')
|
||||
|
||||
Returns:
|
||||
Suggested template name
|
||||
|
||||
"""
|
||||
context_lower = context.lower()
|
||||
|
||||
# Check for keyword matches
|
||||
for key, templates in self.CONTEXT_MAP.items():
|
||||
if key in context_lower:
|
||||
return templates[0]
|
||||
|
||||
# Default fallback
|
||||
return "buzz"
|
||||
|
||||
def list_templates(self) -> dict[str, str]:
|
||||
"""List all available templates with descriptions.
|
||||
|
||||
Returns:
|
||||
Dictionary of template names and descriptions
|
||||
|
||||
"""
|
||||
return self.TEMPLATES
|
||||
|
||||
def get_markdown_image(self, url: str, alt_text: str = "Meme", width: int | None = None) -> str:
|
||||
"""Generate markdown for embedding the meme image.
|
||||
|
||||
Args:
|
||||
url: The meme URL
|
||||
alt_text: Alternative text for the image
|
||||
width: Optional width specification
|
||||
|
||||
Returns:
|
||||
Markdown image syntax
|
||||
|
||||
"""
|
||||
if width:
|
||||
return f'<img src="{url}" alt="{alt_text}" width="{width}"/>'
|
||||
return f""
|
||||
|
||||
|
||||
def main() -> None:
|
||||
"""CLI interface for the meme generator."""
|
||||
parser = argparse.ArgumentParser(description="Generate memes using memegen.link")
|
||||
subparsers = parser.add_subparsers(dest="command", help="Command to run")
|
||||
|
||||
# Generate command
|
||||
generate_parser = subparsers.add_parser("generate", help="Generate a meme")
|
||||
generate_parser.add_argument("template", help="Template name (e.g., buzz, drake)")
|
||||
generate_parser.add_argument("top", help="Top text")
|
||||
generate_parser.add_argument("bottom", nargs="?", default="", help="Bottom text")
|
||||
generate_parser.add_argument(
|
||||
"--extension", "-e", default="png", help="Image format (png, jpg, webp, gif)"
|
||||
)
|
||||
generate_parser.add_argument("--width", "-w", type=int, help="Image width")
|
||||
generate_parser.add_argument("--height", type=int, help="Image height")
|
||||
generate_parser.add_argument("--layout", "-l", help="Layout (top, bottom, default)")
|
||||
generate_parser.add_argument("--markdown", "-m", action="store_true", help="Output as markdown")
|
||||
|
||||
# List templates command
|
||||
subparsers.add_parser("list-templates", help="List all available templates")
|
||||
|
||||
# Suggest template command
|
||||
suggest_parser = subparsers.add_parser("suggest", help="Suggest template for context")
|
||||
suggest_parser.add_argument("context", help="Context description")
|
||||
|
||||
args = parser.parse_args()
|
||||
generator = MemeGenerator()
|
||||
|
||||
if args.command == "generate":
|
||||
generator.generate(
|
||||
template=args.template,
|
||||
top_text=args.top,
|
||||
bottom_text=args.bottom,
|
||||
extension=args.extension,
|
||||
width=args.width,
|
||||
height=getattr(args, "height", None),
|
||||
layout=args.layout,
|
||||
)
|
||||
if args.markdown:
|
||||
pass
|
||||
else:
|
||||
pass
|
||||
|
||||
elif args.command == "list-templates":
|
||||
templates = generator.list_templates()
|
||||
for _name, _description in sorted(templates.items()):
|
||||
pass
|
||||
|
||||
elif args.command == "suggest":
|
||||
generator.suggest_template_for_context(args.context)
|
||||
|
||||
else:
|
||||
parser.print_help()
|
||||
|
||||
|
||||
if __name__ == "__main__":
|
||||
main()
|
||||
43
skills/remotion-best-practices/SKILL.md
Normal file
43
skills/remotion-best-practices/SKILL.md
Normal file
@ -0,0 +1,43 @@
|
||||
---
|
||||
name: remotion-best-practices
|
||||
description: Best practices for Remotion - Video creation in React
|
||||
metadata:
|
||||
tags: remotion, video, react, animation, composition
|
||||
---
|
||||
|
||||
## When to use
|
||||
|
||||
Use this skills whenever you are dealing with Remotion code to obtain the domain-specific knowledge.
|
||||
|
||||
## How to use
|
||||
|
||||
Read individual rule files for detailed explanations and code examples:
|
||||
|
||||
- [rules/3d.md](rules/3d.md) - 3D content in Remotion using Three.js and React Three Fiber
|
||||
- [rules/animations.md](rules/animations.md) - Fundamental animation skills for Remotion
|
||||
- [rules/assets.md](rules/assets.md) - Importing images, videos, audio, and fonts into Remotion
|
||||
- [rules/audio.md](rules/audio.md) - Using audio and sound in Remotion - importing, trimming, volume, speed, pitch
|
||||
- [rules/calculate-metadata.md](rules/calculate-metadata.md) - Dynamically set composition duration, dimensions, and props
|
||||
- [rules/can-decode.md](rules/can-decode.md) - Check if a video can be decoded by the browser using Mediabunny
|
||||
- [rules/charts.md](rules/charts.md) - Chart and data visualization patterns for Remotion
|
||||
- [rules/compositions.md](rules/compositions.md) - Defining compositions, stills, folders, default props and dynamic metadata
|
||||
- [rules/display-captions.md](rules/display-captions.md) - Displaying captions in Remotion with TikTok-style pages and word highlighting
|
||||
- [rules/extract-frames.md](rules/extract-frames.md) - Extract frames from videos at specific timestamps using Mediabunny
|
||||
- [rules/fonts.md](rules/fonts.md) - Loading Google Fonts and local fonts in Remotion
|
||||
- [rules/get-audio-duration.md](rules/get-audio-duration.md) - Getting the duration of an audio file in seconds with Mediabunny
|
||||
- [rules/get-video-dimensions.md](rules/get-video-dimensions.md) - Getting the width and height of a video file with Mediabunny
|
||||
- [rules/get-video-duration.md](rules/get-video-duration.md) - Getting the duration of a video file in seconds with Mediabunny
|
||||
- [rules/gifs.md](rules/gifs.md) - Displaying GIFs synchronized with Remotion's timeline
|
||||
- [rules/images.md](rules/images.md) - Embedding images in Remotion using the Img component
|
||||
- [rules/import-srt-captions.md](rules/import-srt-captions.md) - Importing .srt subtitle files into Remotion using @remotion/captions
|
||||
- [rules/lottie.md](rules/lottie.md) - Embedding Lottie animations in Remotion
|
||||
- [rules/measuring-dom-nodes.md](rules/measuring-dom-nodes.md) - Measuring DOM element dimensions in Remotion
|
||||
- [rules/measuring-text.md](rules/measuring-text.md) - Measuring text dimensions, fitting text to containers, and checking overflow
|
||||
- [rules/sequencing.md](rules/sequencing.md) - Sequencing patterns for Remotion - delay, trim, limit duration of items
|
||||
- [rules/tailwind.md](rules/tailwind.md) - Using TailwindCSS in Remotion
|
||||
- [rules/text-animations.md](rules/text-animations.md) - Typography and text animation patterns for Remotion
|
||||
- [rules/timing.md](rules/timing.md) - Interpolation curves in Remotion - linear, easing, spring animations
|
||||
- [rules/transcribe-captions.md](rules/transcribe-captions.md) - Transcribing audio to generate captions in Remotion
|
||||
- [rules/transitions.md](rules/transitions.md) - Scene transition patterns for Remotion
|
||||
- [rules/trimming.md](rules/trimming.md) - Trimming patterns for Remotion - cut the beginning or end of animations
|
||||
- [rules/videos.md](rules/videos.md) - Embedding videos in Remotion - trimming, volume, speed, looping, pitch
|
||||
86
skills/remotion-best-practices/rules/3d.md
Normal file
86
skills/remotion-best-practices/rules/3d.md
Normal file
@ -0,0 +1,86 @@
|
||||
---
|
||||
name: 3d
|
||||
description: 3D content in Remotion using Three.js and React Three Fiber.
|
||||
metadata:
|
||||
tags: 3d, three, threejs
|
||||
---
|
||||
|
||||
# Using Three.js and React Three Fiber in Remotion
|
||||
|
||||
Follow React Three Fiber and Three.js best practices.
|
||||
Only the following Remotion-specific rules need to be followed:
|
||||
|
||||
## Prerequisites
|
||||
|
||||
First, the `@remotion/three` package needs to be installed.
|
||||
If it is not, use the following command:
|
||||
|
||||
```bash
|
||||
npx remotion add @remotion/three # If project uses npm
|
||||
bunx remotion add @remotion/three # If project uses bun
|
||||
yarn remotion add @remotion/three # If project uses yarn
|
||||
pnpm exec remotion add @remotion/three # If project uses pnpm
|
||||
```
|
||||
|
||||
## Using ThreeCanvas
|
||||
|
||||
You MUST wrap 3D content in `<ThreeCanvas>` and include proper lighting.
|
||||
`<ThreeCanvas>` MUST have a `width` and `height` prop.
|
||||
|
||||
```tsx
|
||||
import { ThreeCanvas } from "@remotion/three";
|
||||
import { useVideoConfig } from "remotion";
|
||||
|
||||
const { width, height } = useVideoConfig();
|
||||
|
||||
<ThreeCanvas width={width} height={height}>
|
||||
<ambientLight intensity={0.4} />
|
||||
<directionalLight position={[5, 5, 5]} intensity={0.8} />
|
||||
<mesh>
|
||||
<sphereGeometry args={[1, 32, 32]} />
|
||||
<meshStandardMaterial color="red" />
|
||||
</mesh>
|
||||
</ThreeCanvas>
|
||||
```
|
||||
|
||||
## No animations not driven by `useCurrentFrame()`
|
||||
|
||||
Shaders, models etc MUST NOT animate by themselves.
|
||||
No animations are allowed unless they are driven by `useCurrentFrame()`.
|
||||
Otherwise, it will cause flickering during rendering.
|
||||
|
||||
Using `useFrame()` from `@react-three/fiber` is forbidden.
|
||||
|
||||
## Animate using `useCurrentFrame()`
|
||||
|
||||
Use `useCurrentFrame()` to perform animations.
|
||||
|
||||
```tsx
|
||||
const frame = useCurrentFrame();
|
||||
const rotationY = frame * 0.02;
|
||||
|
||||
<mesh rotation={[0, rotationY, 0]}>
|
||||
<boxGeometry args={[2, 2, 2]} />
|
||||
<meshStandardMaterial color="#4a9eff" />
|
||||
</mesh>
|
||||
```
|
||||
|
||||
## Using `<Sequence>` inside `<ThreeCanvas>`
|
||||
|
||||
The `layout` prop of any `<Sequence>` inside a `<ThreeCanvas>` must be set to `none`.
|
||||
|
||||
```tsx
|
||||
import { Sequence } from "remotion";
|
||||
import { ThreeCanvas } from "@remotion/three";
|
||||
|
||||
const { width, height } = useVideoConfig();
|
||||
|
||||
<ThreeCanvas width={width} height={height}>
|
||||
<Sequence layout="none">
|
||||
<mesh>
|
||||
<boxGeometry args={[2, 2, 2]} />
|
||||
<meshStandardMaterial color="#4a9eff" />
|
||||
</mesh>
|
||||
</Sequence>
|
||||
</ThreeCanvas>
|
||||
```
|
||||
29
skills/remotion-best-practices/rules/animations.md
Normal file
29
skills/remotion-best-practices/rules/animations.md
Normal file
@ -0,0 +1,29 @@
|
||||
---
|
||||
name: animations
|
||||
description: Fundamental animation skills for Remotion
|
||||
metadata:
|
||||
tags: animations, transitions, frames, useCurrentFrame
|
||||
---
|
||||
|
||||
All animations MUST be driven by the `useCurrentFrame()` hook.
|
||||
Write animations in seconds and multiply them by the `fps` value from `useVideoConfig()`.
|
||||
|
||||
```tsx
|
||||
import { useCurrentFrame } from "remotion";
|
||||
|
||||
export const FadeIn = () => {
|
||||
const frame = useCurrentFrame();
|
||||
const { fps } = useVideoConfig();
|
||||
|
||||
const opacity = interpolate(frame, [0, 2 * fps], [0, 1], {
|
||||
extrapolateRight: 'clamp',
|
||||
});
|
||||
|
||||
return (
|
||||
<div style={{ opacity }}>Hello World!</div>
|
||||
);
|
||||
};
|
||||
```
|
||||
|
||||
CSS transitions or animations are FORBIDDEN - they will not render correctly.
|
||||
Tailwind animation class names are FORBIDDEN - they will not render correctly.
|
||||
78
skills/remotion-best-practices/rules/assets.md
Normal file
78
skills/remotion-best-practices/rules/assets.md
Normal file
@ -0,0 +1,78 @@
|
||||
---
|
||||
name: assets
|
||||
description: Importing images, videos, audio, and fonts into Remotion
|
||||
metadata:
|
||||
tags: assets, staticFile, images, fonts, public
|
||||
---
|
||||
|
||||
# Importing assets in Remotion
|
||||
|
||||
## The public folder
|
||||
|
||||
Place assets in the `public/` folder at your project root.
|
||||
|
||||
## Using staticFile()
|
||||
|
||||
You MUST use `staticFile()` to reference files from the `public/` folder:
|
||||
|
||||
```tsx
|
||||
import {Img, staticFile} from 'remotion';
|
||||
|
||||
export const MyComposition = () => {
|
||||
return <Img src={staticFile('logo.png')} />;
|
||||
};
|
||||
```
|
||||
|
||||
The function returns an encoded URL that works correctly when deploying to subdirectories.
|
||||
|
||||
## Using with components
|
||||
|
||||
**Images:**
|
||||
|
||||
```tsx
|
||||
import {Img, staticFile} from 'remotion';
|
||||
|
||||
<Img src={staticFile('photo.png')} />;
|
||||
```
|
||||
|
||||
**Videos:**
|
||||
|
||||
```tsx
|
||||
import {Video} from '@remotion/media';
|
||||
import {staticFile} from 'remotion';
|
||||
|
||||
<Video src={staticFile('clip.mp4')} />;
|
||||
```
|
||||
|
||||
**Audio:**
|
||||
|
||||
```tsx
|
||||
import {Audio} from '@remotion/media';
|
||||
import {staticFile} from 'remotion';
|
||||
|
||||
<Audio src={staticFile('music.mp3')} />;
|
||||
```
|
||||
|
||||
**Fonts:**
|
||||
|
||||
```tsx
|
||||
import {staticFile} from 'remotion';
|
||||
|
||||
const fontFamily = new FontFace('MyFont', `url(${staticFile('font.woff2')})`);
|
||||
await fontFamily.load();
|
||||
document.fonts.add(fontFamily);
|
||||
```
|
||||
|
||||
## Remote URLs
|
||||
|
||||
Remote URLs can be used directly without `staticFile()`:
|
||||
|
||||
```tsx
|
||||
<Img src="https://example.com/image.png" />
|
||||
<Video src="https://remotion.media/video.mp4" />
|
||||
```
|
||||
|
||||
## Important notes
|
||||
|
||||
- Remotion components (`<Img>`, `<Video>`, `<Audio>`) ensure assets are fully loaded before rendering
|
||||
- Special characters in filenames (`#`, `?`, `&`) are automatically encoded
|
||||
173
skills/remotion-best-practices/rules/assets/charts-bar-chart.tsx
Normal file
173
skills/remotion-best-practices/rules/assets/charts-bar-chart.tsx
Normal file
@ -0,0 +1,173 @@
|
||||
import {loadFont} from '@remotion/google-fonts/Inter';
|
||||
import {AbsoluteFill, spring, useCurrentFrame, useVideoConfig} from 'remotion';
|
||||
|
||||
const {fontFamily} = loadFont();
|
||||
|
||||
const COLOR_BAR = '#D4AF37';
|
||||
const COLOR_TEXT = '#ffffff';
|
||||
const COLOR_MUTED = '#888888';
|
||||
const COLOR_BG = '#0a0a0a';
|
||||
const COLOR_AXIS = '#333333';
|
||||
|
||||
// Ideal composition size: 1280x720
|
||||
|
||||
const Title: React.FC<{children: React.ReactNode}> = ({children}) => (
|
||||
<div style={{textAlign: 'center', marginBottom: 40}}>
|
||||
<div style={{color: COLOR_TEXT, fontSize: 48, fontWeight: 600}}>
|
||||
{children}
|
||||
</div>
|
||||
</div>
|
||||
);
|
||||
|
||||
const YAxis: React.FC<{steps: number[]; height: number}> = ({
|
||||
steps,
|
||||
height,
|
||||
}) => (
|
||||
<div
|
||||
style={{
|
||||
display: 'flex',
|
||||
flexDirection: 'column',
|
||||
justifyContent: 'space-between',
|
||||
height,
|
||||
paddingRight: 16,
|
||||
}}
|
||||
>
|
||||
{steps
|
||||
.slice()
|
||||
.reverse()
|
||||
.map((step) => (
|
||||
<div
|
||||
key={step}
|
||||
style={{
|
||||
color: COLOR_MUTED,
|
||||
fontSize: 20,
|
||||
textAlign: 'right',
|
||||
}}
|
||||
>
|
||||
{step.toLocaleString()}
|
||||
</div>
|
||||
))}
|
||||
</div>
|
||||
);
|
||||
|
||||
const Bar: React.FC<{
|
||||
height: number;
|
||||
progress: number;
|
||||
}> = ({height, progress}) => (
|
||||
<div
|
||||
style={{
|
||||
flex: 1,
|
||||
display: 'flex',
|
||||
flexDirection: 'column',
|
||||
justifyContent: 'flex-end',
|
||||
}}
|
||||
>
|
||||
<div
|
||||
style={{
|
||||
width: '100%',
|
||||
height,
|
||||
backgroundColor: COLOR_BAR,
|
||||
borderRadius: '8px 8px 0 0',
|
||||
opacity: progress,
|
||||
}}
|
||||
/>
|
||||
</div>
|
||||
);
|
||||
|
||||
const XAxis: React.FC<{
|
||||
children: React.ReactNode;
|
||||
labels: string[];
|
||||
height: number;
|
||||
}> = ({children, labels, height}) => (
|
||||
<div style={{flex: 1, display: 'flex', flexDirection: 'column'}}>
|
||||
<div
|
||||
style={{
|
||||
display: 'flex',
|
||||
alignItems: 'flex-end',
|
||||
gap: 16,
|
||||
height,
|
||||
borderLeft: `2px solid ${COLOR_AXIS}`,
|
||||
borderBottom: `2px solid ${COLOR_AXIS}`,
|
||||
paddingLeft: 16,
|
||||
}}
|
||||
>
|
||||
{children}
|
||||
</div>
|
||||
<div
|
||||
style={{
|
||||
display: 'flex',
|
||||
gap: 16,
|
||||
paddingLeft: 16,
|
||||
marginTop: 12,
|
||||
}}
|
||||
>
|
||||
{labels.map((label) => (
|
||||
<div
|
||||
key={label}
|
||||
style={{
|
||||
flex: 1,
|
||||
textAlign: 'center',
|
||||
color: COLOR_MUTED,
|
||||
fontSize: 20,
|
||||
}}
|
||||
>
|
||||
{label}
|
||||
</div>
|
||||
))}
|
||||
</div>
|
||||
</div>
|
||||
);
|
||||
|
||||
export const MyAnimation = () => {
|
||||
const frame = useCurrentFrame();
|
||||
const {fps, height} = useVideoConfig();
|
||||
|
||||
const data = [
|
||||
{month: 'Jan', price: 2039},
|
||||
{month: 'Mar', price: 2160},
|
||||
{month: 'May', price: 2327},
|
||||
{month: 'Jul', price: 2426},
|
||||
{month: 'Sep', price: 2634},
|
||||
{month: 'Nov', price: 2672},
|
||||
];
|
||||
|
||||
const minPrice = 2000;
|
||||
const maxPrice = 2800;
|
||||
const priceRange = maxPrice - minPrice;
|
||||
const chartHeight = height - 280;
|
||||
const yAxisSteps = [2000, 2400, 2800];
|
||||
|
||||
return (
|
||||
<AbsoluteFill
|
||||
style={{
|
||||
backgroundColor: COLOR_BG,
|
||||
padding: 60,
|
||||
display: 'flex',
|
||||
flexDirection: 'column',
|
||||
fontFamily,
|
||||
}}
|
||||
>
|
||||
<Title>Gold Price 2024</Title>
|
||||
|
||||
<div style={{display: 'flex', flex: 1}}>
|
||||
<YAxis steps={yAxisSteps} height={chartHeight} />
|
||||
<XAxis height={chartHeight} labels={data.map((d) => d.month)}>
|
||||
{data.map((item, i) => {
|
||||
const progress = spring({
|
||||
frame: frame - i * 5 - 10,
|
||||
fps,
|
||||
config: {damping: 18, stiffness: 80},
|
||||
});
|
||||
|
||||
const barHeight =
|
||||
((item.price - minPrice) / priceRange) * chartHeight * progress;
|
||||
|
||||
return (
|
||||
<Bar key={item.month} height={barHeight} progress={progress} />
|
||||
);
|
||||
})}
|
||||
</XAxis>
|
||||
</div>
|
||||
</AbsoluteFill>
|
||||
);
|
||||
};
|
||||
@ -0,0 +1,100 @@
|
||||
import {
|
||||
AbsoluteFill,
|
||||
interpolate,
|
||||
useCurrentFrame,
|
||||
useVideoConfig,
|
||||
} from 'remotion';
|
||||
|
||||
const COLOR_BG = '#ffffff';
|
||||
const COLOR_TEXT = '#000000';
|
||||
const FULL_TEXT = 'From prompt to motion graphics. This is Remotion.';
|
||||
const PAUSE_AFTER = 'From prompt to motion graphics.';
|
||||
const FONT_SIZE = 72;
|
||||
const FONT_WEIGHT = 700;
|
||||
const CHAR_FRAMES = 2;
|
||||
const CURSOR_BLINK_FRAMES = 16;
|
||||
const PAUSE_SECONDS = 1;
|
||||
|
||||
// Ideal composition size: 1280x720
|
||||
|
||||
const getTypedText = ({
|
||||
frame,
|
||||
fullText,
|
||||
pauseAfter,
|
||||
charFrames,
|
||||
pauseFrames,
|
||||
}: {
|
||||
frame: number;
|
||||
fullText: string;
|
||||
pauseAfter: string;
|
||||
charFrames: number;
|
||||
pauseFrames: number;
|
||||
}): string => {
|
||||
const pauseIndex = fullText.indexOf(pauseAfter);
|
||||
const preLen =
|
||||
pauseIndex >= 0 ? pauseIndex + pauseAfter.length : fullText.length;
|
||||
|
||||
let typedChars = 0;
|
||||
if (frame < preLen * charFrames) {
|
||||
typedChars = Math.floor(frame / charFrames);
|
||||
} else if (frame < preLen * charFrames + pauseFrames) {
|
||||
typedChars = preLen;
|
||||
} else {
|
||||
const postPhase = frame - preLen * charFrames - pauseFrames;
|
||||
typedChars = Math.min(
|
||||
fullText.length,
|
||||
preLen + Math.floor(postPhase / charFrames),
|
||||
);
|
||||
}
|
||||
return fullText.slice(0, typedChars);
|
||||
};
|
||||
|
||||
const Cursor: React.FC<{
|
||||
frame: number;
|
||||
blinkFrames: number;
|
||||
symbol?: string;
|
||||
}> = ({frame, blinkFrames, symbol = '\u258C'}) => {
|
||||
const opacity = interpolate(
|
||||
frame % blinkFrames,
|
||||
[0, blinkFrames / 2, blinkFrames],
|
||||
[1, 0, 1],
|
||||
{extrapolateLeft: 'clamp', extrapolateRight: 'clamp'},
|
||||
);
|
||||
|
||||
return <span style={{opacity}}>{symbol}</span>;
|
||||
};
|
||||
|
||||
export const MyAnimation = () => {
|
||||
const frame = useCurrentFrame();
|
||||
const {fps} = useVideoConfig();
|
||||
|
||||
const pauseFrames = Math.round(fps * PAUSE_SECONDS);
|
||||
|
||||
const typedText = getTypedText({
|
||||
frame,
|
||||
fullText: FULL_TEXT,
|
||||
pauseAfter: PAUSE_AFTER,
|
||||
charFrames: CHAR_FRAMES,
|
||||
pauseFrames,
|
||||
});
|
||||
|
||||
return (
|
||||
<AbsoluteFill
|
||||
style={{
|
||||
backgroundColor: COLOR_BG,
|
||||
}}
|
||||
>
|
||||
<div
|
||||
style={{
|
||||
color: COLOR_TEXT,
|
||||
fontSize: FONT_SIZE,
|
||||
fontWeight: FONT_WEIGHT,
|
||||
fontFamily: 'sans-serif',
|
||||
}}
|
||||
>
|
||||
<span>{typedText}</span>
|
||||
<Cursor frame={frame} blinkFrames={CURSOR_BLINK_FRAMES} />
|
||||
</div>
|
||||
</AbsoluteFill>
|
||||
);
|
||||
};
|
||||
@ -0,0 +1,108 @@
|
||||
import {loadFont} from '@remotion/google-fonts/Inter';
|
||||
import React from 'react';
|
||||
import {
|
||||
AbsoluteFill,
|
||||
spring,
|
||||
useCurrentFrame,
|
||||
useVideoConfig,
|
||||
} from 'remotion';
|
||||
|
||||
/*
|
||||
* Highlight a word in a sentence with a spring-animated wipe effect.
|
||||
*/
|
||||
|
||||
// Ideal composition size: 1280x720
|
||||
|
||||
const COLOR_BG = '#ffffff';
|
||||
const COLOR_TEXT = '#000000';
|
||||
const COLOR_HIGHLIGHT = '#A7C7E7';
|
||||
const FULL_TEXT = 'This is Remotion.';
|
||||
const HIGHLIGHT_WORD = 'Remotion';
|
||||
const FONT_SIZE = 72;
|
||||
const FONT_WEIGHT = 700;
|
||||
const HIGHLIGHT_START_FRAME = 30;
|
||||
const HIGHLIGHT_WIPE_DURATION = 18;
|
||||
|
||||
const {fontFamily} = loadFont();
|
||||
|
||||
const Highlight: React.FC<{
|
||||
word: string;
|
||||
color: string;
|
||||
delay: number;
|
||||
durationInFrames: number;
|
||||
}> = ({word, color, delay, durationInFrames}) => {
|
||||
const frame = useCurrentFrame();
|
||||
const {fps} = useVideoConfig();
|
||||
|
||||
const highlightProgress = spring({
|
||||
fps,
|
||||
frame,
|
||||
config: {damping: 200},
|
||||
delay,
|
||||
durationInFrames,
|
||||
});
|
||||
const scaleX = Math.max(0, Math.min(1, highlightProgress));
|
||||
|
||||
return (
|
||||
<span style={{position: 'relative', display: 'inline-block'}}>
|
||||
<span
|
||||
style={{
|
||||
position: 'absolute',
|
||||
left: 0,
|
||||
right: 0,
|
||||
top: '50%',
|
||||
height: '1.05em',
|
||||
transform: `translateY(-50%) scaleX(${scaleX})`,
|
||||
transformOrigin: 'left center',
|
||||
backgroundColor: color,
|
||||
borderRadius: '0.18em',
|
||||
zIndex: 0,
|
||||
}}
|
||||
/>
|
||||
<span style={{position: 'relative', zIndex: 1}}>{word}</span>
|
||||
</span>
|
||||
);
|
||||
};
|
||||
|
||||
export const MyAnimation = () => {
|
||||
const highlightIndex = FULL_TEXT.indexOf(HIGHLIGHT_WORD);
|
||||
const hasHighlight = highlightIndex >= 0;
|
||||
const preText = hasHighlight ? FULL_TEXT.slice(0, highlightIndex) : FULL_TEXT;
|
||||
const postText = hasHighlight
|
||||
? FULL_TEXT.slice(highlightIndex + HIGHLIGHT_WORD.length)
|
||||
: '';
|
||||
|
||||
return (
|
||||
<AbsoluteFill
|
||||
style={{
|
||||
backgroundColor: COLOR_BG,
|
||||
alignItems: 'center',
|
||||
justifyContent: 'center',
|
||||
fontFamily,
|
||||
}}
|
||||
>
|
||||
<div
|
||||
style={{
|
||||
color: COLOR_TEXT,
|
||||
fontSize: FONT_SIZE,
|
||||
fontWeight: FONT_WEIGHT,
|
||||
}}
|
||||
>
|
||||
{hasHighlight ? (
|
||||
<>
|
||||
<span>{preText}</span>
|
||||
<Highlight
|
||||
word={HIGHLIGHT_WORD}
|
||||
color={COLOR_HIGHLIGHT}
|
||||
delay={HIGHLIGHT_START_FRAME}
|
||||
durationInFrames={HIGHLIGHT_WIPE_DURATION}
|
||||
/>
|
||||
<span>{postText}</span>
|
||||
</>
|
||||
) : (
|
||||
<span>{FULL_TEXT}</span>
|
||||
)}
|
||||
</div>
|
||||
</AbsoluteFill>
|
||||
);
|
||||
};
|
||||
172
skills/remotion-best-practices/rules/audio.md
Normal file
172
skills/remotion-best-practices/rules/audio.md
Normal file
@ -0,0 +1,172 @@
|
||||
---
|
||||
name: audio
|
||||
description: Using audio and sound in Remotion - importing, trimming, volume, speed, pitch
|
||||
metadata:
|
||||
tags: audio, media, trim, volume, speed, loop, pitch, mute, sound, sfx
|
||||
---
|
||||
|
||||
# Using audio in Remotion
|
||||
|
||||
## Prerequisites
|
||||
|
||||
First, the @remotion/media package needs to be installed.
|
||||
If it is not installed, use the following command:
|
||||
|
||||
```bash
|
||||
npx remotion add @remotion/media # If project uses npm
|
||||
bunx remotion add @remotion/media # If project uses bun
|
||||
yarn remotion add @remotion/media # If project uses yarn
|
||||
pnpm exec remotion add @remotion/media # If project uses pnpm
|
||||
```
|
||||
|
||||
## Importing Audio
|
||||
|
||||
Use `<Audio>` from `@remotion/media` to add audio to your composition.
|
||||
|
||||
```tsx
|
||||
import { Audio } from "@remotion/media";
|
||||
import { staticFile } from "remotion";
|
||||
|
||||
export const MyComposition = () => {
|
||||
return <Audio src={staticFile("audio.mp3")} />;
|
||||
};
|
||||
```
|
||||
|
||||
Remote URLs are also supported:
|
||||
|
||||
```tsx
|
||||
<Audio src="https://remotion.media/audio.mp3" />
|
||||
```
|
||||
|
||||
By default, audio plays from the start, at full volume and full length.
|
||||
Multiple audio tracks can be layered by adding multiple `<Audio>` components.
|
||||
|
||||
## Trimming
|
||||
|
||||
Use `trimBefore` and `trimAfter` to remove portions of the audio. Values are in frames.
|
||||
|
||||
```tsx
|
||||
const { fps } = useVideoConfig();
|
||||
|
||||
return (
|
||||
<Audio
|
||||
src={staticFile("audio.mp3")}
|
||||
trimBefore={2 * fps} // Skip the first 2 seconds
|
||||
trimAfter={10 * fps} // End at the 10 second mark
|
||||
/>
|
||||
);
|
||||
```
|
||||
|
||||
The audio still starts playing at the beginning of the composition - only the specified portion is played.
|
||||
|
||||
## Delaying
|
||||
|
||||
Wrap the audio in a `<Sequence>` to delay when it starts:
|
||||
|
||||
```tsx
|
||||
import { Sequence, staticFile } from "remotion";
|
||||
import { Audio } from "@remotion/media";
|
||||
|
||||
const { fps } = useVideoConfig();
|
||||
|
||||
return (
|
||||
<Sequence from={1 * fps}>
|
||||
<Audio src={staticFile("audio.mp3")} />
|
||||
</Sequence>
|
||||
);
|
||||
```
|
||||
|
||||
The audio will start playing after 1 second.
|
||||
|
||||
## Volume
|
||||
|
||||
Set a static volume (0 to 1):
|
||||
|
||||
```tsx
|
||||
<Audio src={staticFile("audio.mp3")} volume={0.5} />
|
||||
```
|
||||
|
||||
Or use a callback for dynamic volume based on the current frame:
|
||||
|
||||
```tsx
|
||||
import { interpolate } from "remotion";
|
||||
|
||||
const { fps } = useVideoConfig();
|
||||
|
||||
return (
|
||||
<Audio
|
||||
src={staticFile("audio.mp3")}
|
||||
volume={(f) =>
|
||||
interpolate(f, [0, 1 * fps], [0, 1], { extrapolateRight: "clamp" })
|
||||
}
|
||||
/>
|
||||
);
|
||||
```
|
||||
|
||||
The value of `f` starts at 0 when the audio begins to play, not the composition frame.
|
||||
|
||||
## Muting
|
||||
|
||||
Use `muted` to silence the audio. It can be set dynamically:
|
||||
|
||||
```tsx
|
||||
const frame = useCurrentFrame();
|
||||
const { fps } = useVideoConfig();
|
||||
|
||||
return (
|
||||
<Audio
|
||||
src={staticFile("audio.mp3")}
|
||||
muted={frame >= 2 * fps && frame <= 4 * fps} // Mute between 2s and 4s
|
||||
/>
|
||||
);
|
||||
```
|
||||
|
||||
## Speed
|
||||
|
||||
Use `playbackRate` to change the playback speed:
|
||||
|
||||
```tsx
|
||||
<Audio src={staticFile("audio.mp3")} playbackRate={2} /> {/* 2x speed */}
|
||||
<Audio src={staticFile("audio.mp3")} playbackRate={0.5} /> {/* Half speed */}
|
||||
```
|
||||
|
||||
Reverse playback is not supported.
|
||||
|
||||
## Looping
|
||||
|
||||
Use `loop` to loop the audio indefinitely:
|
||||
|
||||
```tsx
|
||||
<Audio src={staticFile("audio.mp3")} loop />
|
||||
```
|
||||
|
||||
Use `loopVolumeCurveBehavior` to control how the frame count behaves when looping:
|
||||
|
||||
- `"repeat"`: Frame count resets to 0 each loop (default)
|
||||
- `"extend"`: Frame count continues incrementing
|
||||
|
||||
```tsx
|
||||
<Audio
|
||||
src={staticFile("audio.mp3")}
|
||||
loop
|
||||
loopVolumeCurveBehavior="extend"
|
||||
volume={(f) => interpolate(f, [0, 300], [1, 0])} // Fade out over multiple loops
|
||||
/>
|
||||
```
|
||||
|
||||
## Pitch
|
||||
|
||||
Use `toneFrequency` to adjust the pitch without affecting speed. Values range from 0.01 to 2:
|
||||
|
||||
```tsx
|
||||
<Audio
|
||||
src={staticFile("audio.mp3")}
|
||||
toneFrequency={1.5} // Higher pitch
|
||||
/>
|
||||
<Audio
|
||||
src={staticFile("audio.mp3")}
|
||||
toneFrequency={0.8} // Lower pitch
|
||||
/>
|
||||
```
|
||||
|
||||
Pitch shifting only works during server-side rendering, not in the Remotion Studio preview or in the `<Player />`.
|
||||
104
skills/remotion-best-practices/rules/calculate-metadata.md
Normal file
104
skills/remotion-best-practices/rules/calculate-metadata.md
Normal file
@ -0,0 +1,104 @@
|
||||
---
|
||||
name: calculate-metadata
|
||||
description: Dynamically set composition duration, dimensions, and props
|
||||
metadata:
|
||||
tags: calculateMetadata, duration, dimensions, props, dynamic
|
||||
---
|
||||
|
||||
# Using calculateMetadata
|
||||
|
||||
Use `calculateMetadata` on a `<Composition>` to dynamically set duration, dimensions, and transform props before rendering.
|
||||
|
||||
```tsx
|
||||
<Composition id="MyComp" component={MyComponent} durationInFrames={300} fps={30} width={1920} height={1080} defaultProps={{videoSrc: 'https://remotion.media/video.mp4'}} calculateMetadata={calculateMetadata} />
|
||||
```
|
||||
|
||||
## Setting duration based on a video
|
||||
|
||||
Use the `getMediaMetadata()` function from the mediabunny/metadata skill to get the video duration:
|
||||
|
||||
```tsx
|
||||
import {CalculateMetadataFunction} from 'remotion';
|
||||
import {getMediaMetadata} from '../get-media-metadata';
|
||||
|
||||
const calculateMetadata: CalculateMetadataFunction<Props> = async ({props}) => {
|
||||
const {durationInSeconds} = await getMediaMetadata(props.videoSrc);
|
||||
|
||||
return {
|
||||
durationInFrames: Math.ceil(durationInSeconds * 30),
|
||||
};
|
||||
};
|
||||
```
|
||||
|
||||
## Matching dimensions of a video
|
||||
|
||||
```tsx
|
||||
const calculateMetadata: CalculateMetadataFunction<Props> = async ({props}) => {
|
||||
const {durationInSeconds, dimensions} = await getMediaMetadata(props.videoSrc);
|
||||
|
||||
return {
|
||||
durationInFrames: Math.ceil(durationInSeconds * 30),
|
||||
width: dimensions?.width ?? 1920,
|
||||
height: dimensions?.height ?? 1080,
|
||||
};
|
||||
};
|
||||
```
|
||||
|
||||
## Setting duration based on multiple videos
|
||||
|
||||
```tsx
|
||||
const calculateMetadata: CalculateMetadataFunction<Props> = async ({props}) => {
|
||||
const metadataPromises = props.videos.map((video) => getMediaMetadata(video.src));
|
||||
const allMetadata = await Promise.all(metadataPromises);
|
||||
|
||||
const totalDuration = allMetadata.reduce((sum, meta) => sum + meta.durationInSeconds, 0);
|
||||
|
||||
return {
|
||||
durationInFrames: Math.ceil(totalDuration * 30),
|
||||
};
|
||||
};
|
||||
```
|
||||
|
||||
## Setting a default outName
|
||||
|
||||
Set the default output filename based on props:
|
||||
|
||||
```tsx
|
||||
const calculateMetadata: CalculateMetadataFunction<Props> = async ({props}) => {
|
||||
return {
|
||||
defaultOutName: `video-${props.id}.mp4`,
|
||||
};
|
||||
};
|
||||
```
|
||||
|
||||
## Transforming props
|
||||
|
||||
Fetch data or transform props before rendering:
|
||||
|
||||
```tsx
|
||||
const calculateMetadata: CalculateMetadataFunction<Props> = async ({props, abortSignal}) => {
|
||||
const response = await fetch(props.dataUrl, {signal: abortSignal});
|
||||
const data = await response.json();
|
||||
|
||||
return {
|
||||
props: {
|
||||
...props,
|
||||
fetchedData: data,
|
||||
},
|
||||
};
|
||||
};
|
||||
```
|
||||
|
||||
The `abortSignal` cancels stale requests when props change in the Studio.
|
||||
|
||||
## Return value
|
||||
|
||||
All fields are optional. Returned values override the `<Composition>` props:
|
||||
|
||||
- `durationInFrames`: Number of frames
|
||||
- `width`: Composition width in pixels
|
||||
- `height`: Composition height in pixels
|
||||
- `fps`: Frames per second
|
||||
- `props`: Transformed props passed to the component
|
||||
- `defaultOutName`: Default output filename
|
||||
- `defaultCodec`: Default codec for rendering
|
||||
75
skills/remotion-best-practices/rules/can-decode.md
Normal file
75
skills/remotion-best-practices/rules/can-decode.md
Normal file
@ -0,0 +1,75 @@
|
||||
---
|
||||
name: can-decode
|
||||
description: Check if a video can be decoded by the browser using Mediabunny
|
||||
metadata:
|
||||
tags: decode, validation, video, audio, compatibility, browser
|
||||
---
|
||||
|
||||
# Checking if a video can be decoded
|
||||
|
||||
Use Mediabunny to check if a video can be decoded by the browser before attempting to play it.
|
||||
|
||||
## The `canDecode()` function
|
||||
|
||||
This function can be copy-pasted into any project.
|
||||
|
||||
```tsx
|
||||
import { Input, ALL_FORMATS, UrlSource } from "mediabunny";
|
||||
|
||||
export const canDecode = async (src: string) => {
|
||||
const input = new Input({
|
||||
formats: ALL_FORMATS,
|
||||
source: new UrlSource(src, {
|
||||
getRetryDelay: () => null,
|
||||
}),
|
||||
});
|
||||
|
||||
try {
|
||||
await input.getFormat();
|
||||
} catch {
|
||||
return false;
|
||||
}
|
||||
|
||||
const videoTrack = await input.getPrimaryVideoTrack();
|
||||
if (videoTrack && !(await videoTrack.canDecode())) {
|
||||
return false;
|
||||
}
|
||||
|
||||
const audioTrack = await input.getPrimaryAudioTrack();
|
||||
if (audioTrack && !(await audioTrack.canDecode())) {
|
||||
return false;
|
||||
}
|
||||
|
||||
return true;
|
||||
};
|
||||
```
|
||||
|
||||
## Usage
|
||||
|
||||
```tsx
|
||||
const src = "https://remotion.media/video.mp4";
|
||||
const isDecodable = await canDecode(src);
|
||||
|
||||
if (isDecodable) {
|
||||
console.log("Video can be decoded");
|
||||
} else {
|
||||
console.log("Video cannot be decoded by this browser");
|
||||
}
|
||||
```
|
||||
|
||||
## Using with Blob
|
||||
|
||||
For file uploads or drag-and-drop, use `BlobSource`:
|
||||
|
||||
```tsx
|
||||
import { Input, ALL_FORMATS, BlobSource } from "mediabunny";
|
||||
|
||||
export const canDecodeBlob = async (blob: Blob) => {
|
||||
const input = new Input({
|
||||
formats: ALL_FORMATS,
|
||||
source: new BlobSource(blob),
|
||||
});
|
||||
|
||||
// Same validation logic as above
|
||||
};
|
||||
```
|
||||
58
skills/remotion-best-practices/rules/charts.md
Normal file
58
skills/remotion-best-practices/rules/charts.md
Normal file
@ -0,0 +1,58 @@
|
||||
---
|
||||
name: charts
|
||||
description: Chart and data visualization patterns for Remotion. Use when creating bar charts, pie charts, histograms, progress bars, or any data-driven animations.
|
||||
metadata:
|
||||
tags: charts, data, visualization, bar-chart, pie-chart, graphs
|
||||
---
|
||||
|
||||
# Charts in Remotion
|
||||
|
||||
You can create bar charts in Remotion by using regular React code - HTML and SVG is allowed, as well as D3.js.
|
||||
|
||||
## No animations not powered by `useCurrentFrame()`
|
||||
|
||||
Disable all animations by third party libraries.
|
||||
They will cause flickering during rendering.
|
||||
Instead, drive all animations from `useCurrentFrame()`.
|
||||
|
||||
## Bar Chart Animations
|
||||
|
||||
See [Bar Chart Example](assets/charts/bar-chart.tsx) for a basic example implmentation.
|
||||
|
||||
### Staggered Bars
|
||||
|
||||
You can animate the height of the bars and stagger them like this:
|
||||
|
||||
```tsx
|
||||
const STAGGER_DELAY = 5;
|
||||
const frame = useCurrentFrame();
|
||||
const {fps} = useVideoConfig();
|
||||
|
||||
const bars = data.map((item, i) => {
|
||||
const delay = i * STAGGER_DELAY;
|
||||
const height = spring({
|
||||
frame,
|
||||
fps,
|
||||
delay,
|
||||
config: {damping: 200},
|
||||
});
|
||||
return <div style={{height: height * item.value}} />;
|
||||
});
|
||||
```
|
||||
|
||||
## Pie Chart Animation
|
||||
|
||||
Animate segments using stroke-dashoffset, starting from 12 o'clock.
|
||||
|
||||
```tsx
|
||||
const frame = useCurrentFrame();
|
||||
const {fps} = useVideoConfig();
|
||||
|
||||
const progress = interpolate(frame, [0, 100], [0, 1]);
|
||||
|
||||
const circumference = 2 * Math.PI * radius;
|
||||
const segmentLength = (value / total) * circumference;
|
||||
const offset = interpolate(progress, [0, 1], [segmentLength, 0]);
|
||||
|
||||
<circle r={radius} cx={center} cy={center} fill="none" stroke={color} strokeWidth={strokeWidth} strokeDasharray={`${segmentLength} ${circumference}`} strokeDashoffset={offset} transform={`rotate(-90 ${center} ${center})`} />;
|
||||
```
|
||||
146
skills/remotion-best-practices/rules/compositions.md
Normal file
146
skills/remotion-best-practices/rules/compositions.md
Normal file
@ -0,0 +1,146 @@
|
||||
---
|
||||
name: compositions
|
||||
description: Defining compositions, stills, folders, default props and dynamic metadata
|
||||
metadata:
|
||||
tags: composition, still, folder, props, metadata
|
||||
---
|
||||
|
||||
A `<Composition>` defines the component, width, height, fps and duration of a renderable video.
|
||||
|
||||
It normally is placed in the `src/Root.tsx` file.
|
||||
|
||||
```tsx
|
||||
import { Composition } from "remotion";
|
||||
import { MyComposition } from "./MyComposition";
|
||||
|
||||
export const RemotionRoot = () => {
|
||||
return (
|
||||
<Composition
|
||||
id="MyComposition"
|
||||
component={MyComposition}
|
||||
durationInFrames={100}
|
||||
fps={30}
|
||||
width={1080}
|
||||
height={1080}
|
||||
/>
|
||||
);
|
||||
};
|
||||
```
|
||||
|
||||
## Default Props
|
||||
|
||||
Pass `defaultProps` to provide initial values for your component.
|
||||
Values must be JSON-serializable (`Date`, `Map`, `Set`, and `staticFile()` are supported).
|
||||
|
||||
```tsx
|
||||
import { Composition } from "remotion";
|
||||
import { MyComposition, MyCompositionProps } from "./MyComposition";
|
||||
|
||||
export const RemotionRoot = () => {
|
||||
return (
|
||||
<Composition
|
||||
id="MyComposition"
|
||||
component={MyComposition}
|
||||
durationInFrames={100}
|
||||
fps={30}
|
||||
width={1080}
|
||||
height={1080}
|
||||
defaultProps={{
|
||||
title: "Hello World",
|
||||
color: "#ff0000",
|
||||
} satisfies MyCompositionProps}
|
||||
/>
|
||||
);
|
||||
};
|
||||
```
|
||||
|
||||
Use `type` declarations for props rather than `interface` to ensure `defaultProps` type safety.
|
||||
|
||||
## Folders
|
||||
|
||||
Use `<Folder>` to organize compositions in the sidebar.
|
||||
Folder names can only contain letters, numbers, and hyphens.
|
||||
|
||||
```tsx
|
||||
import { Composition, Folder } from "remotion";
|
||||
|
||||
export const RemotionRoot = () => {
|
||||
return (
|
||||
<>
|
||||
<Folder name="Marketing">
|
||||
<Composition id="Promo" /* ... */ />
|
||||
<Composition id="Ad" /* ... */ />
|
||||
</Folder>
|
||||
<Folder name="Social">
|
||||
<Folder name="Instagram">
|
||||
<Composition id="Story" /* ... */ />
|
||||
<Composition id="Reel" /* ... */ />
|
||||
</Folder>
|
||||
</Folder>
|
||||
</>
|
||||
);
|
||||
};
|
||||
```
|
||||
|
||||
## Stills
|
||||
|
||||
Use `<Still>` for single-frame images. It does not require `durationInFrames` or `fps`.
|
||||
|
||||
```tsx
|
||||
import { Still } from "remotion";
|
||||
import { Thumbnail } from "./Thumbnail";
|
||||
|
||||
export const RemotionRoot = () => {
|
||||
return (
|
||||
<Still
|
||||
id="Thumbnail"
|
||||
component={Thumbnail}
|
||||
width={1280}
|
||||
height={720}
|
||||
/>
|
||||
);
|
||||
};
|
||||
```
|
||||
|
||||
## Calculate Metadata
|
||||
|
||||
Use `calculateMetadata` to make dimensions, duration, or props dynamic based on data.
|
||||
|
||||
```tsx
|
||||
import { Composition, CalculateMetadataFunction } from "remotion";
|
||||
import { MyComposition, MyCompositionProps } from "./MyComposition";
|
||||
|
||||
const calculateMetadata: CalculateMetadataFunction<MyCompositionProps> = async ({
|
||||
props,
|
||||
abortSignal,
|
||||
}) => {
|
||||
const data = await fetch(`https://api.example.com/video/${props.videoId}`, {
|
||||
signal: abortSignal,
|
||||
}).then((res) => res.json());
|
||||
|
||||
return {
|
||||
durationInFrames: Math.ceil(data.duration * 30),
|
||||
props: {
|
||||
...props,
|
||||
videoUrl: data.url,
|
||||
},
|
||||
};
|
||||
};
|
||||
|
||||
export const RemotionRoot = () => {
|
||||
return (
|
||||
<Composition
|
||||
id="MyComposition"
|
||||
component={MyComposition}
|
||||
durationInFrames={100} // Placeholder, will be overridden
|
||||
fps={30}
|
||||
width={1080}
|
||||
height={1080}
|
||||
defaultProps={{ videoId: "abc123" }}
|
||||
calculateMetadata={calculateMetadata}
|
||||
/>
|
||||
);
|
||||
};
|
||||
```
|
||||
|
||||
The function can return `props`, `durationInFrames`, `width`, `height`, `fps`, and codec-related defaults. It runs once before rendering begins.
|
||||
126
skills/remotion-best-practices/rules/display-captions.md
Normal file
126
skills/remotion-best-practices/rules/display-captions.md
Normal file
@ -0,0 +1,126 @@
|
||||
---
|
||||
name: display-captions
|
||||
description: Displaying captions in Remotion with TikTok-style pages and word highlighting
|
||||
metadata:
|
||||
tags: captions, subtitles, display, tiktok, highlight
|
||||
---
|
||||
|
||||
# Displaying captions in Remotion
|
||||
|
||||
This guide explains how to display captions in Remotion, assuming you already have captions in the `Caption` format.
|
||||
|
||||
## Prerequisites
|
||||
|
||||
First, the @remotion/captions package needs to be installed.
|
||||
If it is not installed, use the following command:
|
||||
|
||||
```bash
|
||||
npx remotion add @remotion/captions # If project uses npm
|
||||
bunx remotion add @remotion/captions # If project uses bun
|
||||
yarn remotion add @remotion/captions # If project uses yarn
|
||||
pnpm exec remotion add @remotion/captions # If project uses pnpm
|
||||
```
|
||||
|
||||
## Creating pages
|
||||
|
||||
Use `createTikTokStyleCaptions()` to group captions into pages. The `combineTokensWithinMilliseconds` option controls how many words appear at once:
|
||||
|
||||
```tsx
|
||||
import {useMemo} from 'react';
|
||||
import {createTikTokStyleCaptions} from '@remotion/captions';
|
||||
import type {Caption} from '@remotion/captions';
|
||||
|
||||
// How often captions should switch (in milliseconds)
|
||||
// Higher values = more words per page
|
||||
// Lower values = fewer words (more word-by-word)
|
||||
const SWITCH_CAPTIONS_EVERY_MS = 1200;
|
||||
|
||||
const {pages} = useMemo(() => {
|
||||
return createTikTokStyleCaptions({
|
||||
captions,
|
||||
combineTokensWithinMilliseconds: SWITCH_CAPTIONS_EVERY_MS,
|
||||
});
|
||||
}, [captions]);
|
||||
```
|
||||
|
||||
## Rendering with Sequences
|
||||
|
||||
Map over the pages and render each one in a `<Sequence>`. Calculate the start frame and duration from the page timing:
|
||||
|
||||
```tsx
|
||||
import {Sequence, useVideoConfig, AbsoluteFill} from 'remotion';
|
||||
import type {TikTokPage} from '@remotion/captions';
|
||||
|
||||
const CaptionedContent: React.FC = () => {
|
||||
const {fps} = useVideoConfig();
|
||||
|
||||
return (
|
||||
<AbsoluteFill>
|
||||
{pages.map((page, index) => {
|
||||
const nextPage = pages[index + 1] ?? null;
|
||||
const startFrame = (page.startMs / 1000) * fps;
|
||||
const endFrame = Math.min(
|
||||
nextPage ? (nextPage.startMs / 1000) * fps : Infinity,
|
||||
startFrame + (SWITCH_CAPTIONS_EVERY_MS / 1000) * fps,
|
||||
);
|
||||
const durationInFrames = endFrame - startFrame;
|
||||
|
||||
if (durationInFrames <= 0) {
|
||||
return null;
|
||||
}
|
||||
|
||||
return (
|
||||
<Sequence
|
||||
key={index}
|
||||
from={startFrame}
|
||||
durationInFrames={durationInFrames}
|
||||
>
|
||||
<CaptionPage page={page} />
|
||||
</Sequence>
|
||||
);
|
||||
})}
|
||||
</AbsoluteFill>
|
||||
);
|
||||
};
|
||||
```
|
||||
|
||||
## Word highlighting
|
||||
|
||||
A caption page contains `tokens` which you can use to highlight the currently spoken word:
|
||||
|
||||
```tsx
|
||||
import {AbsoluteFill, useCurrentFrame, useVideoConfig} from 'remotion';
|
||||
import type {TikTokPage} from '@remotion/captions';
|
||||
|
||||
const HIGHLIGHT_COLOR = '#39E508';
|
||||
|
||||
const CaptionPage: React.FC<{page: TikTokPage}> = ({page}) => {
|
||||
const frame = useCurrentFrame();
|
||||
const {fps} = useVideoConfig();
|
||||
|
||||
// Current time relative to the start of the sequence
|
||||
const currentTimeMs = (frame / fps) * 1000;
|
||||
// Convert to absolute time by adding the page start
|
||||
const absoluteTimeMs = page.startMs + currentTimeMs;
|
||||
|
||||
return (
|
||||
<AbsoluteFill style={{justifyContent: 'center', alignItems: 'center'}}>
|
||||
<div style={{fontSize: 80, fontWeight: 'bold', whiteSpace: 'pre'}}>
|
||||
{page.tokens.map((token) => {
|
||||
const isActive =
|
||||
token.fromMs <= absoluteTimeMs && token.toMs > absoluteTimeMs;
|
||||
|
||||
return (
|
||||
<span
|
||||
key={token.fromMs}
|
||||
style={{color: isActive ? HIGHLIGHT_COLOR : 'white'}}
|
||||
>
|
||||
{token.text}
|
||||
</span>
|
||||
);
|
||||
})}
|
||||
</div>
|
||||
</AbsoluteFill>
|
||||
);
|
||||
};
|
||||
```
|
||||
229
skills/remotion-best-practices/rules/extract-frames.md
Normal file
229
skills/remotion-best-practices/rules/extract-frames.md
Normal file
@ -0,0 +1,229 @@
|
||||
---
|
||||
name: extract-frames
|
||||
description: Extract frames from videos at specific timestamps using Mediabunny
|
||||
metadata:
|
||||
tags: frames, extract, video, thumbnail, filmstrip, canvas
|
||||
---
|
||||
|
||||
# Extracting frames from videos
|
||||
|
||||
Use Mediabunny to extract frames from videos at specific timestamps. This is useful for generating thumbnails, filmstrips, or processing individual frames.
|
||||
|
||||
## The `extractFrames()` function
|
||||
|
||||
This function can be copy-pasted into any project.
|
||||
|
||||
```tsx
|
||||
import {
|
||||
ALL_FORMATS,
|
||||
Input,
|
||||
UrlSource,
|
||||
VideoSample,
|
||||
VideoSampleSink,
|
||||
} from "mediabunny";
|
||||
|
||||
type Options = {
|
||||
track: { width: number; height: number };
|
||||
container: string;
|
||||
durationInSeconds: number | null;
|
||||
};
|
||||
|
||||
export type ExtractFramesTimestampsInSecondsFn = (
|
||||
options: Options
|
||||
) => Promise<number[]> | number[];
|
||||
|
||||
export type ExtractFramesProps = {
|
||||
src: string;
|
||||
timestampsInSeconds: number[] | ExtractFramesTimestampsInSecondsFn;
|
||||
onVideoSample: (sample: VideoSample) => void;
|
||||
signal?: AbortSignal;
|
||||
};
|
||||
|
||||
export async function extractFrames({
|
||||
src,
|
||||
timestampsInSeconds,
|
||||
onVideoSample,
|
||||
signal,
|
||||
}: ExtractFramesProps): Promise<void> {
|
||||
using input = new Input({
|
||||
formats: ALL_FORMATS,
|
||||
source: new UrlSource(src),
|
||||
});
|
||||
|
||||
const [durationInSeconds, format, videoTrack] = await Promise.all([
|
||||
input.computeDuration(),
|
||||
input.getFormat(),
|
||||
input.getPrimaryVideoTrack(),
|
||||
]);
|
||||
|
||||
if (!videoTrack) {
|
||||
throw new Error("No video track found in the input");
|
||||
}
|
||||
|
||||
if (signal?.aborted) {
|
||||
throw new Error("Aborted");
|
||||
}
|
||||
|
||||
const timestamps =
|
||||
typeof timestampsInSeconds === "function"
|
||||
? await timestampsInSeconds({
|
||||
track: {
|
||||
width: videoTrack.displayWidth,
|
||||
height: videoTrack.displayHeight,
|
||||
},
|
||||
container: format.name,
|
||||
durationInSeconds,
|
||||
})
|
||||
: timestampsInSeconds;
|
||||
|
||||
if (timestamps.length === 0) {
|
||||
return;
|
||||
}
|
||||
|
||||
if (signal?.aborted) {
|
||||
throw new Error("Aborted");
|
||||
}
|
||||
|
||||
const sink = new VideoSampleSink(videoTrack);
|
||||
|
||||
for await (using videoSample of sink.samplesAtTimestamps(timestamps)) {
|
||||
if (signal?.aborted) {
|
||||
break;
|
||||
}
|
||||
|
||||
if (!videoSample) {
|
||||
continue;
|
||||
}
|
||||
|
||||
onVideoSample(videoSample);
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
## Basic usage
|
||||
|
||||
Extract frames at specific timestamps:
|
||||
|
||||
```tsx
|
||||
await extractFrames({
|
||||
src: "https://remotion.media/video.mp4",
|
||||
timestampsInSeconds: [0, 1, 2, 3, 4],
|
||||
onVideoSample: (sample) => {
|
||||
const canvas = document.createElement("canvas");
|
||||
canvas.width = sample.displayWidth;
|
||||
canvas.height = sample.displayHeight;
|
||||
const ctx = canvas.getContext("2d");
|
||||
sample.draw(ctx!, 0, 0);
|
||||
},
|
||||
});
|
||||
```
|
||||
|
||||
## Creating a filmstrip
|
||||
|
||||
Use a callback function to dynamically calculate timestamps based on video metadata:
|
||||
|
||||
```tsx
|
||||
const canvasWidth = 500;
|
||||
const canvasHeight = 80;
|
||||
const fromSeconds = 0;
|
||||
const toSeconds = 10;
|
||||
|
||||
await extractFrames({
|
||||
src: "https://remotion.media/video.mp4",
|
||||
timestampsInSeconds: async ({ track, durationInSeconds }) => {
|
||||
const aspectRatio = track.width / track.height;
|
||||
const amountOfFramesFit = Math.ceil(
|
||||
canvasWidth / (canvasHeight * aspectRatio)
|
||||
);
|
||||
const segmentDuration = toSeconds - fromSeconds;
|
||||
const timestamps: number[] = [];
|
||||
|
||||
for (let i = 0; i < amountOfFramesFit; i++) {
|
||||
timestamps.push(
|
||||
fromSeconds + (segmentDuration / amountOfFramesFit) * (i + 0.5)
|
||||
);
|
||||
}
|
||||
|
||||
return timestamps;
|
||||
},
|
||||
onVideoSample: (sample) => {
|
||||
console.log(`Frame at ${sample.timestamp}s`);
|
||||
|
||||
const canvas = document.createElement("canvas");
|
||||
canvas.width = sample.displayWidth;
|
||||
canvas.height = sample.displayHeight;
|
||||
const ctx = canvas.getContext("2d");
|
||||
sample.draw(ctx!, 0, 0);
|
||||
},
|
||||
});
|
||||
```
|
||||
|
||||
## Cancellation with AbortSignal
|
||||
|
||||
Cancel frame extraction after a timeout:
|
||||
|
||||
```tsx
|
||||
const controller = new AbortController();
|
||||
|
||||
setTimeout(() => controller.abort(), 5000);
|
||||
|
||||
try {
|
||||
await extractFrames({
|
||||
src: "https://remotion.media/video.mp4",
|
||||
timestampsInSeconds: [0, 1, 2, 3, 4],
|
||||
onVideoSample: (sample) => {
|
||||
using frame = sample;
|
||||
const canvas = document.createElement("canvas");
|
||||
canvas.width = frame.displayWidth;
|
||||
canvas.height = frame.displayHeight;
|
||||
const ctx = canvas.getContext("2d");
|
||||
frame.draw(ctx!, 0, 0);
|
||||
},
|
||||
signal: controller.signal,
|
||||
});
|
||||
|
||||
console.log("Frame extraction complete!");
|
||||
} catch (error) {
|
||||
console.error("Frame extraction was aborted or failed:", error);
|
||||
}
|
||||
```
|
||||
|
||||
## Timeout with Promise.race
|
||||
|
||||
```tsx
|
||||
const controller = new AbortController();
|
||||
|
||||
const timeoutPromise = new Promise<never>((_, reject) => {
|
||||
const timeoutId = setTimeout(() => {
|
||||
controller.abort();
|
||||
reject(new Error("Frame extraction timed out after 10 seconds"));
|
||||
}, 10000);
|
||||
|
||||
controller.signal.addEventListener("abort", () => clearTimeout(timeoutId), {
|
||||
once: true,
|
||||
});
|
||||
});
|
||||
|
||||
try {
|
||||
await Promise.race([
|
||||
extractFrames({
|
||||
src: "https://remotion.media/video.mp4",
|
||||
timestampsInSeconds: [0, 1, 2, 3, 4],
|
||||
onVideoSample: (sample) => {
|
||||
using frame = sample;
|
||||
const canvas = document.createElement("canvas");
|
||||
canvas.width = frame.displayWidth;
|
||||
canvas.height = frame.displayHeight;
|
||||
const ctx = canvas.getContext("2d");
|
||||
frame.draw(ctx!, 0, 0);
|
||||
},
|
||||
signal: controller.signal,
|
||||
}),
|
||||
timeoutPromise,
|
||||
]);
|
||||
|
||||
console.log("Frame extraction complete!");
|
||||
} catch (error) {
|
||||
console.error("Frame extraction was aborted or failed:", error);
|
||||
}
|
||||
```
|
||||
152
skills/remotion-best-practices/rules/fonts.md
Normal file
152
skills/remotion-best-practices/rules/fonts.md
Normal file
@ -0,0 +1,152 @@
|
||||
---
|
||||
name: fonts
|
||||
description: Loading Google Fonts and local fonts in Remotion
|
||||
metadata:
|
||||
tags: fonts, google-fonts, typography, text
|
||||
---
|
||||
|
||||
# Using fonts in Remotion
|
||||
|
||||
## Google Fonts with @remotion/google-fonts
|
||||
|
||||
The recommended way to use Google Fonts. It's type-safe and automatically blocks rendering until the font is ready.
|
||||
|
||||
### Prerequisites
|
||||
|
||||
First, the @remotion/google-fonts package needs to be installed.
|
||||
If it is not installed, use the following command:
|
||||
|
||||
```bash
|
||||
npx remotion add @remotion/google-fonts # If project uses npm
|
||||
bunx remotion add @remotion/google-fonts # If project uses bun
|
||||
yarn remotion add @remotion/google-fonts # If project uses yarn
|
||||
pnpm exec remotion add @remotion/google-fonts # If project uses pnpm
|
||||
```
|
||||
|
||||
```tsx
|
||||
import { loadFont } from "@remotion/google-fonts/Lobster";
|
||||
|
||||
const { fontFamily } = loadFont();
|
||||
|
||||
export const MyComposition = () => {
|
||||
return <div style={{ fontFamily }}>Hello World</div>;
|
||||
};
|
||||
```
|
||||
|
||||
Preferrably, specify only needed weights and subsets to reduce file size:
|
||||
|
||||
```tsx
|
||||
import { loadFont } from "@remotion/google-fonts/Roboto";
|
||||
|
||||
const { fontFamily } = loadFont("normal", {
|
||||
weights: ["400", "700"],
|
||||
subsets: ["latin"],
|
||||
});
|
||||
```
|
||||
|
||||
### Waiting for font to load
|
||||
|
||||
Use `waitUntilDone()` if you need to know when the font is ready:
|
||||
|
||||
```tsx
|
||||
import { loadFont } from "@remotion/google-fonts/Lobster";
|
||||
|
||||
const { fontFamily, waitUntilDone } = loadFont();
|
||||
|
||||
await waitUntilDone();
|
||||
```
|
||||
|
||||
## Local fonts with @remotion/fonts
|
||||
|
||||
For local font files, use the `@remotion/fonts` package.
|
||||
|
||||
### Prerequisites
|
||||
|
||||
First, install @remotion/fonts:
|
||||
|
||||
```bash
|
||||
npx remotion add @remotion/fonts # If project uses npm
|
||||
bunx remotion add @remotion/fonts # If project uses bun
|
||||
yarn remotion add @remotion/fonts # If project uses yarn
|
||||
pnpm exec remotion add @remotion/fonts # If project uses pnpm
|
||||
```
|
||||
|
||||
### Loading a local font
|
||||
|
||||
Place your font file in the `public/` folder and use `loadFont()`:
|
||||
|
||||
```tsx
|
||||
import { loadFont } from "@remotion/fonts";
|
||||
import { staticFile } from "remotion";
|
||||
|
||||
await loadFont({
|
||||
family: "MyFont",
|
||||
url: staticFile("MyFont-Regular.woff2"),
|
||||
});
|
||||
|
||||
export const MyComposition = () => {
|
||||
return <div style={{ fontFamily: "MyFont" }}>Hello World</div>;
|
||||
};
|
||||
```
|
||||
|
||||
### Loading multiple weights
|
||||
|
||||
Load each weight separately with the same family name:
|
||||
|
||||
```tsx
|
||||
import { loadFont } from "@remotion/fonts";
|
||||
import { staticFile } from "remotion";
|
||||
|
||||
await Promise.all([
|
||||
loadFont({
|
||||
family: "Inter",
|
||||
url: staticFile("Inter-Regular.woff2"),
|
||||
weight: "400",
|
||||
}),
|
||||
loadFont({
|
||||
family: "Inter",
|
||||
url: staticFile("Inter-Bold.woff2"),
|
||||
weight: "700",
|
||||
}),
|
||||
]);
|
||||
```
|
||||
|
||||
### Available options
|
||||
|
||||
```tsx
|
||||
loadFont({
|
||||
family: "MyFont", // Required: name to use in CSS
|
||||
url: staticFile("font.woff2"), // Required: font file URL
|
||||
format: "woff2", // Optional: auto-detected from extension
|
||||
weight: "400", // Optional: font weight
|
||||
style: "normal", // Optional: normal or italic
|
||||
display: "block", // Optional: font-display behavior
|
||||
});
|
||||
```
|
||||
|
||||
## Using in components
|
||||
|
||||
Call `loadFont()` at the top level of your component or in a separate file that's imported early:
|
||||
|
||||
```tsx
|
||||
import { loadFont } from "@remotion/google-fonts/Montserrat";
|
||||
|
||||
const { fontFamily } = loadFont("normal", {
|
||||
weights: ["400", "700"],
|
||||
subsets: ["latin"],
|
||||
});
|
||||
|
||||
export const Title: React.FC<{ text: string }> = ({ text }) => {
|
||||
return (
|
||||
<h1
|
||||
style={{
|
||||
fontFamily,
|
||||
fontSize: 80,
|
||||
fontWeight: "bold",
|
||||
}}
|
||||
>
|
||||
{text}
|
||||
</h1>
|
||||
);
|
||||
};
|
||||
```
|
||||
58
skills/remotion-best-practices/rules/get-audio-duration.md
Normal file
58
skills/remotion-best-practices/rules/get-audio-duration.md
Normal file
@ -0,0 +1,58 @@
|
||||
---
|
||||
name: get-audio-duration
|
||||
description: Getting the duration of an audio file in seconds with Mediabunny
|
||||
metadata:
|
||||
tags: duration, audio, length, time, seconds, mp3, wav
|
||||
---
|
||||
|
||||
# Getting audio duration with Mediabunny
|
||||
|
||||
Mediabunny can extract the duration of an audio file. It works in browser, Node.js, and Bun environments.
|
||||
|
||||
## Getting audio duration
|
||||
|
||||
```tsx
|
||||
import { Input, ALL_FORMATS, UrlSource } from "mediabunny";
|
||||
|
||||
export const getAudioDuration = async (src: string) => {
|
||||
const input = new Input({
|
||||
formats: ALL_FORMATS,
|
||||
source: new UrlSource(src, {
|
||||
getRetryDelay: () => null,
|
||||
}),
|
||||
});
|
||||
|
||||
const durationInSeconds = await input.computeDuration();
|
||||
return durationInSeconds;
|
||||
};
|
||||
```
|
||||
|
||||
## Usage
|
||||
|
||||
```tsx
|
||||
const duration = await getAudioDuration("https://remotion.media/audio.mp3");
|
||||
console.log(duration); // e.g. 180.5 (seconds)
|
||||
```
|
||||
|
||||
## Using with local files
|
||||
|
||||
For local files, use `FileSource` instead of `UrlSource`:
|
||||
|
||||
```tsx
|
||||
import { Input, ALL_FORMATS, FileSource } from "mediabunny";
|
||||
|
||||
const input = new Input({
|
||||
formats: ALL_FORMATS,
|
||||
source: new FileSource(file), // File object from input or drag-drop
|
||||
});
|
||||
|
||||
const durationInSeconds = await input.computeDuration();
|
||||
```
|
||||
|
||||
## Using with staticFile in Remotion
|
||||
|
||||
```tsx
|
||||
import { staticFile } from "remotion";
|
||||
|
||||
const duration = await getAudioDuration(staticFile("audio.mp3"));
|
||||
```
|
||||
68
skills/remotion-best-practices/rules/get-video-dimensions.md
Normal file
68
skills/remotion-best-practices/rules/get-video-dimensions.md
Normal file
@ -0,0 +1,68 @@
|
||||
---
|
||||
name: get-video-dimensions
|
||||
description: Getting the width and height of a video file with Mediabunny
|
||||
metadata:
|
||||
tags: dimensions, width, height, resolution, size, video
|
||||
---
|
||||
|
||||
# Getting video dimensions with Mediabunny
|
||||
|
||||
Mediabunny can extract the width and height of a video file. It works in browser, Node.js, and Bun environments.
|
||||
|
||||
## Getting video dimensions
|
||||
|
||||
```tsx
|
||||
import { Input, ALL_FORMATS, UrlSource } from "mediabunny";
|
||||
|
||||
export const getVideoDimensions = async (src: string) => {
|
||||
const input = new Input({
|
||||
formats: ALL_FORMATS,
|
||||
source: new UrlSource(src, {
|
||||
getRetryDelay: () => null,
|
||||
}),
|
||||
});
|
||||
|
||||
const videoTrack = await input.getPrimaryVideoTrack();
|
||||
if (!videoTrack) {
|
||||
throw new Error("No video track found");
|
||||
}
|
||||
|
||||
return {
|
||||
width: videoTrack.displayWidth,
|
||||
height: videoTrack.displayHeight,
|
||||
};
|
||||
};
|
||||
```
|
||||
|
||||
## Usage
|
||||
|
||||
```tsx
|
||||
const dimensions = await getVideoDimensions("https://remotion.media/video.mp4");
|
||||
console.log(dimensions.width); // e.g. 1920
|
||||
console.log(dimensions.height); // e.g. 1080
|
||||
```
|
||||
|
||||
## Using with local files
|
||||
|
||||
For local files, use `FileSource` instead of `UrlSource`:
|
||||
|
||||
```tsx
|
||||
import { Input, ALL_FORMATS, FileSource } from "mediabunny";
|
||||
|
||||
const input = new Input({
|
||||
formats: ALL_FORMATS,
|
||||
source: new FileSource(file), // File object from input or drag-drop
|
||||
});
|
||||
|
||||
const videoTrack = await input.getPrimaryVideoTrack();
|
||||
const width = videoTrack.displayWidth;
|
||||
const height = videoTrack.displayHeight;
|
||||
```
|
||||
|
||||
## Using with staticFile in Remotion
|
||||
|
||||
```tsx
|
||||
import { staticFile } from "remotion";
|
||||
|
||||
const dimensions = await getVideoDimensions(staticFile("video.mp4"));
|
||||
```
|
||||
58
skills/remotion-best-practices/rules/get-video-duration.md
Normal file
58
skills/remotion-best-practices/rules/get-video-duration.md
Normal file
@ -0,0 +1,58 @@
|
||||
---
|
||||
name: get-video-duration
|
||||
description: Getting the duration of a video file in seconds with Mediabunny
|
||||
metadata:
|
||||
tags: duration, video, length, time, seconds
|
||||
---
|
||||
|
||||
# Getting video duration with Mediabunny
|
||||
|
||||
Mediabunny can extract the duration of a video file. It works in browser, Node.js, and Bun environments.
|
||||
|
||||
## Getting video duration
|
||||
|
||||
```tsx
|
||||
import { Input, ALL_FORMATS, UrlSource } from "mediabunny";
|
||||
|
||||
export const getVideoDuration = async (src: string) => {
|
||||
const input = new Input({
|
||||
formats: ALL_FORMATS,
|
||||
source: new UrlSource(src, {
|
||||
getRetryDelay: () => null,
|
||||
}),
|
||||
});
|
||||
|
||||
const durationInSeconds = await input.computeDuration();
|
||||
return durationInSeconds;
|
||||
};
|
||||
```
|
||||
|
||||
## Usage
|
||||
|
||||
```tsx
|
||||
const duration = await getVideoDuration("https://remotion.media/video.mp4");
|
||||
console.log(duration); // e.g. 10.5 (seconds)
|
||||
```
|
||||
|
||||
## Using with local files
|
||||
|
||||
For local files, use `FileSource` instead of `UrlSource`:
|
||||
|
||||
```tsx
|
||||
import { Input, ALL_FORMATS, FileSource } from "mediabunny";
|
||||
|
||||
const input = new Input({
|
||||
formats: ALL_FORMATS,
|
||||
source: new FileSource(file), // File object from input or drag-drop
|
||||
});
|
||||
|
||||
const durationInSeconds = await input.computeDuration();
|
||||
```
|
||||
|
||||
## Using with staticFile in Remotion
|
||||
|
||||
```tsx
|
||||
import { staticFile } from "remotion";
|
||||
|
||||
const duration = await getVideoDuration(staticFile("video.mp4"));
|
||||
```
|
||||
138
skills/remotion-best-practices/rules/gifs.md
Normal file
138
skills/remotion-best-practices/rules/gifs.md
Normal file
@ -0,0 +1,138 @@
|
||||
---
|
||||
name: gif
|
||||
description: Displaying GIFs, APNG, AVIF and WebP in Remotion
|
||||
metadata:
|
||||
tags: gif, animation, images, animated, apng, avif, webp
|
||||
---
|
||||
|
||||
# Using Animated images in Remotion
|
||||
|
||||
## Basic usage
|
||||
|
||||
Use `<AnimatedImage>` to display a GIF, APNG, AVIF or WebP image synchronized with Remotion's timeline:
|
||||
|
||||
```tsx
|
||||
import {AnimatedImage, staticFile} from 'remotion';
|
||||
|
||||
export const MyComposition = () => {
|
||||
return <AnimatedImage src={staticFile('animation.gif')} width={500} height={500} />;
|
||||
};
|
||||
```
|
||||
|
||||
Remote URLs are also supported (must have CORS enabled):
|
||||
|
||||
```tsx
|
||||
<AnimatedImage src="https://example.com/animation.gif" width={500} height={500} />
|
||||
```
|
||||
|
||||
## Sizing and fit
|
||||
|
||||
Control how the image fills its container with the `fit` prop:
|
||||
|
||||
```tsx
|
||||
// Stretch to fill (default)
|
||||
<AnimatedImage src={staticFile("animation.gif")} width={500} height={300} fit="fill" />
|
||||
|
||||
// Maintain aspect ratio, fit inside container
|
||||
<AnimatedImage src={staticFile("animation.gif")} width={500} height={300} fit="contain" />
|
||||
|
||||
// Fill container, crop if needed
|
||||
<AnimatedImage src={staticFile("animation.gif")} width={500} height={300} fit="cover" />
|
||||
```
|
||||
|
||||
## Playback speed
|
||||
|
||||
Use `playbackRate` to control the animation speed:
|
||||
|
||||
```tsx
|
||||
<AnimatedImage src={staticFile("animation.gif")} width={500} height={500} playbackRate={2} /> {/* 2x speed */}
|
||||
<AnimatedImage src={staticFile("animation.gif")} width={500} height={500} playbackRate={0.5} /> {/* Half speed */}
|
||||
```
|
||||
|
||||
## Looping behavior
|
||||
|
||||
Control what happens when the animation finishes:
|
||||
|
||||
```tsx
|
||||
// Loop indefinitely (default)
|
||||
<AnimatedImage src={staticFile("animation.gif")} width={500} height={500} loopBehavior="loop" />
|
||||
|
||||
// Play once, show final frame
|
||||
<AnimatedImage src={staticFile("animation.gif")} width={500} height={500} loopBehavior="pause-after-finish" />
|
||||
|
||||
// Play once, then clear canvas
|
||||
<AnimatedImage src={staticFile("animation.gif")} width={500} height={500} loopBehavior="clear-after-finish" />
|
||||
```
|
||||
|
||||
## Styling
|
||||
|
||||
Use the `style` prop for additional CSS (use `width` and `height` props for sizing):
|
||||
|
||||
```tsx
|
||||
<AnimatedImage
|
||||
src={staticFile('animation.gif')}
|
||||
width={500}
|
||||
height={500}
|
||||
style={{
|
||||
borderRadius: 20,
|
||||
position: 'absolute',
|
||||
top: 100,
|
||||
left: 50,
|
||||
}}
|
||||
/>
|
||||
```
|
||||
|
||||
## Getting GIF duration
|
||||
|
||||
Use `getGifDurationInSeconds()` from `@remotion/gif` to get the duration of a GIF.
|
||||
|
||||
```bash
|
||||
npx remotion add @remotion/gif # If project uses npm
|
||||
bunx remotion add @remotion/gif # If project uses bun
|
||||
yarn remotion add @remotion/gif # If project uses yarn
|
||||
pnpm exec remotion add @remotion/gif # If project uses pnpm
|
||||
```
|
||||
|
||||
```tsx
|
||||
import {getGifDurationInSeconds} from '@remotion/gif';
|
||||
import {staticFile} from 'remotion';
|
||||
|
||||
const duration = await getGifDurationInSeconds(staticFile('animation.gif'));
|
||||
console.log(duration); // e.g. 2.5
|
||||
```
|
||||
|
||||
This is useful for setting the composition duration to match the GIF:
|
||||
|
||||
```tsx
|
||||
import {getGifDurationInSeconds} from '@remotion/gif';
|
||||
import {staticFile, CalculateMetadataFunction} from 'remotion';
|
||||
|
||||
const calculateMetadata: CalculateMetadataFunction = async () => {
|
||||
const duration = await getGifDurationInSeconds(staticFile('animation.gif'));
|
||||
return {
|
||||
durationInFrames: Math.ceil(duration * 30),
|
||||
};
|
||||
};
|
||||
```
|
||||
|
||||
## Alternative
|
||||
|
||||
If `<AnimatedImage>` does not work (only supported in Chrome and Firefox), you can use `<Gif>` from `@remotion/gif` instead.
|
||||
|
||||
```bash
|
||||
npx remotion add @remotion/gif # If project uses npm
|
||||
bunx remotion add @remotion/gif # If project uses bun
|
||||
yarn remotion add @remotion/gif # If project uses yarn
|
||||
pnpm exec remotion add @remotion/gif # If project uses pnpm
|
||||
```
|
||||
|
||||
```tsx
|
||||
import {Gif} from '@remotion/gif';
|
||||
import {staticFile} from 'remotion';
|
||||
|
||||
export const MyComposition = () => {
|
||||
return <Gif src={staticFile('animation.gif')} width={500} height={500} />;
|
||||
};
|
||||
```
|
||||
|
||||
The `<Gif>` component has the same props as `<AnimatedImage>` but only supports GIF files.
|
||||
130
skills/remotion-best-practices/rules/images.md
Normal file
130
skills/remotion-best-practices/rules/images.md
Normal file
@ -0,0 +1,130 @@
|
||||
---
|
||||
name: images
|
||||
description: Embedding images in Remotion using the <Img> component
|
||||
metadata:
|
||||
tags: images, img, staticFile, png, jpg, svg, webp
|
||||
---
|
||||
|
||||
# Using images in Remotion
|
||||
|
||||
## The `<Img>` component
|
||||
|
||||
Always use the `<Img>` component from `remotion` to display images:
|
||||
|
||||
```tsx
|
||||
import { Img, staticFile } from "remotion";
|
||||
|
||||
export const MyComposition = () => {
|
||||
return <Img src={staticFile("photo.png")} />;
|
||||
};
|
||||
```
|
||||
|
||||
## Important restrictions
|
||||
|
||||
**You MUST use the `<Img>` component from `remotion`.** Do not use:
|
||||
|
||||
- Native HTML `<img>` elements
|
||||
- Next.js `<Image>` component
|
||||
- CSS `background-image`
|
||||
|
||||
The `<Img>` component ensures images are fully loaded before rendering, preventing flickering and blank frames during video export.
|
||||
|
||||
## Local images with staticFile()
|
||||
|
||||
Place images in the `public/` folder and use `staticFile()` to reference them:
|
||||
|
||||
```
|
||||
my-video/
|
||||
├─ public/
|
||||
│ ├─ logo.png
|
||||
│ ├─ avatar.jpg
|
||||
│ └─ icon.svg
|
||||
├─ src/
|
||||
├─ package.json
|
||||
```
|
||||
|
||||
```tsx
|
||||
import { Img, staticFile } from "remotion";
|
||||
|
||||
<Img src={staticFile("logo.png")} />
|
||||
```
|
||||
|
||||
## Remote images
|
||||
|
||||
Remote URLs can be used directly without `staticFile()`:
|
||||
|
||||
```tsx
|
||||
<Img src="https://example.com/image.png" />
|
||||
```
|
||||
|
||||
Ensure remote images have CORS enabled.
|
||||
|
||||
For animated GIFs, use the `<Gif>` component from `@remotion/gif` instead.
|
||||
|
||||
## Sizing and positioning
|
||||
|
||||
Use the `style` prop to control size and position:
|
||||
|
||||
```tsx
|
||||
<Img
|
||||
src={staticFile("photo.png")}
|
||||
style={{
|
||||
width: 500,
|
||||
height: 300,
|
||||
position: "absolute",
|
||||
top: 100,
|
||||
left: 50,
|
||||
objectFit: "cover",
|
||||
}}
|
||||
/>
|
||||
```
|
||||
|
||||
## Dynamic image paths
|
||||
|
||||
Use template literals for dynamic file references:
|
||||
|
||||
```tsx
|
||||
import { Img, staticFile, useCurrentFrame } from "remotion";
|
||||
|
||||
const frame = useCurrentFrame();
|
||||
|
||||
// Image sequence
|
||||
<Img src={staticFile(`frames/frame${frame}.png`)} />
|
||||
|
||||
// Selecting based on props
|
||||
<Img src={staticFile(`avatars/${props.userId}.png`)} />
|
||||
|
||||
// Conditional images
|
||||
<Img src={staticFile(`icons/${isActive ? "active" : "inactive"}.svg`)} />
|
||||
```
|
||||
|
||||
This pattern is useful for:
|
||||
|
||||
- Image sequences (frame-by-frame animations)
|
||||
- User-specific avatars or profile images
|
||||
- Theme-based icons
|
||||
- State-dependent graphics
|
||||
|
||||
## Getting image dimensions
|
||||
|
||||
Use `getImageDimensions()` to get the dimensions of an image:
|
||||
|
||||
```tsx
|
||||
import { getImageDimensions, staticFile } from "remotion";
|
||||
|
||||
const { width, height } = await getImageDimensions(staticFile("photo.png"));
|
||||
```
|
||||
|
||||
This is useful for calculating aspect ratios or sizing compositions:
|
||||
|
||||
```tsx
|
||||
import { getImageDimensions, staticFile, CalculateMetadataFunction } from "remotion";
|
||||
|
||||
const calculateMetadata: CalculateMetadataFunction = async () => {
|
||||
const { width, height } = await getImageDimensions(staticFile("photo.png"));
|
||||
return {
|
||||
width,
|
||||
height,
|
||||
};
|
||||
};
|
||||
```
|
||||
67
skills/remotion-best-practices/rules/import-srt-captions.md
Normal file
67
skills/remotion-best-practices/rules/import-srt-captions.md
Normal file
@ -0,0 +1,67 @@
|
||||
---
|
||||
name: import-srt-captions
|
||||
description: Importing .srt subtitle files into Remotion using @remotion/captions
|
||||
metadata:
|
||||
tags: captions, subtitles, srt, import, parse
|
||||
---
|
||||
|
||||
# Importing .srt subtitles into Remotion
|
||||
|
||||
If you have an existing `.srt` subtitle file, you can import it into Remotion using `parseSrt()` from `@remotion/captions`.
|
||||
|
||||
## Prerequisites
|
||||
|
||||
First, the @remotion/captions package needs to be installed.
|
||||
If it is not installed, use the following command:
|
||||
|
||||
```bash
|
||||
npx remotion add @remotion/captions # If project uses npm
|
||||
bunx remotion add @remotion/captions # If project uses bun
|
||||
yarn remotion add @remotion/captions # If project uses yarn
|
||||
pnpm exec remotion add @remotion/captions # If project uses pnpm
|
||||
```
|
||||
|
||||
## Reading an .srt file
|
||||
|
||||
Use `staticFile()` to reference an `.srt` file in your `public` folder, then fetch and parse it:
|
||||
|
||||
```tsx
|
||||
import {useState, useEffect, useCallback} from 'react';
|
||||
import {AbsoluteFill, staticFile, useDelayRender} from 'remotion';
|
||||
import {parseSrt} from '@remotion/captions';
|
||||
import type {Caption} from '@remotion/captions';
|
||||
|
||||
export const MyComponent: React.FC = () => {
|
||||
const [captions, setCaptions] = useState<Caption[] | null>(null);
|
||||
const {delayRender, continueRender, cancelRender} = useDelayRender();
|
||||
const [handle] = useState(() => delayRender());
|
||||
|
||||
const fetchCaptions = useCallback(async () => {
|
||||
try {
|
||||
const response = await fetch(staticFile('subtitles.srt'));
|
||||
const text = await response.text();
|
||||
const {captions: parsed} = parseSrt({input: text});
|
||||
setCaptions(parsed);
|
||||
continueRender(handle);
|
||||
} catch (e) {
|
||||
cancelRender(e);
|
||||
}
|
||||
}, [continueRender, cancelRender, handle]);
|
||||
|
||||
useEffect(() => {
|
||||
fetchCaptions();
|
||||
}, [fetchCaptions]);
|
||||
|
||||
if (!captions) {
|
||||
return null;
|
||||
}
|
||||
|
||||
return <AbsoluteFill>{/* Use captions here */}</AbsoluteFill>;
|
||||
};
|
||||
```
|
||||
|
||||
Remote URLs are also supported - you can `fetch()` a remote file via URL instead of using `staticFile()`.
|
||||
|
||||
## Using imported captions
|
||||
|
||||
Once parsed, the captions are in the `Caption` format and can be used with all `@remotion/captions` utilities.
|
||||
68
skills/remotion-best-practices/rules/lottie.md
Normal file
68
skills/remotion-best-practices/rules/lottie.md
Normal file
@ -0,0 +1,68 @@
|
||||
---
|
||||
name: lottie
|
||||
description: Embedding Lottie animations in Remotion.
|
||||
metadata:
|
||||
category: Animation
|
||||
---
|
||||
|
||||
# Using Lottie Animations in Remotion
|
||||
|
||||
## Prerequisites
|
||||
|
||||
First, the @remotion/lottie package needs to be installed.
|
||||
If it is not, use the following command:
|
||||
|
||||
```bash
|
||||
npx remotion add @remotion/lottie # If project uses npm
|
||||
bunx remotion add @remotion/lottie # If project uses bun
|
||||
yarn remotion add @remotion/lottie # If project uses yarn
|
||||
pnpm exec remotion add @remotion/lottie # If project uses pnpm
|
||||
```
|
||||
|
||||
## Displaying a Lottie file
|
||||
|
||||
To import a Lottie animation:
|
||||
|
||||
- Fetch the Lottie asset
|
||||
- Wrap the loading process in `delayRender()` and `continueRender()`
|
||||
- Save the animation data in a state
|
||||
- Render the Lottie animation using the `Lottie` component from the `@remotion/lottie` package
|
||||
|
||||
```tsx
|
||||
import {Lottie, LottieAnimationData} from '@remotion/lottie';
|
||||
import {useEffect, useState} from 'react';
|
||||
import {cancelRender, continueRender, delayRender} from 'remotion';
|
||||
|
||||
export const MyAnimation = () => {
|
||||
const [handle] = useState(() => delayRender('Loading Lottie animation'));
|
||||
|
||||
const [animationData, setAnimationData] = useState<LottieAnimationData | null>(null);
|
||||
|
||||
useEffect(() => {
|
||||
fetch('https://assets4.lottiefiles.com/packages/lf20_zyquagfl.json')
|
||||
.then((data) => data.json())
|
||||
.then((json) => {
|
||||
setAnimationData(json);
|
||||
continueRender(handle);
|
||||
})
|
||||
.catch((err) => {
|
||||
cancelRender(err);
|
||||
});
|
||||
}, [handle]);
|
||||
|
||||
if (!animationData) {
|
||||
return null;
|
||||
}
|
||||
|
||||
return <Lottie animationData={animationData} />;
|
||||
};
|
||||
```
|
||||
|
||||
## Styling and animating
|
||||
|
||||
Lottie supports the `style` prop to allow styles and animations:
|
||||
|
||||
```tsx
|
||||
return <Lottie animationData={animationData} style={{width: 400, height: 400}} />;
|
||||
```
|
||||
|
||||
35
skills/remotion-best-practices/rules/measuring-dom-nodes.md
Normal file
35
skills/remotion-best-practices/rules/measuring-dom-nodes.md
Normal file
@ -0,0 +1,35 @@
|
||||
---
|
||||
name: measuring-dom-nodes
|
||||
description: Measuring DOM element dimensions in Remotion
|
||||
metadata:
|
||||
tags: measure, layout, dimensions, getBoundingClientRect, scale
|
||||
---
|
||||
|
||||
# Measuring DOM nodes in Remotion
|
||||
|
||||
Remotion applies a `scale()` transform to the video container, which affects values from `getBoundingClientRect()`. Use `useCurrentScale()` to get correct measurements.
|
||||
|
||||
## Measuring element dimensions
|
||||
|
||||
```tsx
|
||||
import { useCurrentScale } from "remotion";
|
||||
import { useRef, useEffect, useState } from "react";
|
||||
|
||||
export const MyComponent = () => {
|
||||
const ref = useRef<HTMLDivElement>(null);
|
||||
const scale = useCurrentScale();
|
||||
const [dimensions, setDimensions] = useState({ width: 0, height: 0 });
|
||||
|
||||
useEffect(() => {
|
||||
if (!ref.current) return;
|
||||
const rect = ref.current.getBoundingClientRect();
|
||||
setDimensions({
|
||||
width: rect.width / scale,
|
||||
height: rect.height / scale,
|
||||
});
|
||||
}, [scale]);
|
||||
|
||||
return <div ref={ref}>Content to measure</div>;
|
||||
};
|
||||
```
|
||||
|
||||
143
skills/remotion-best-practices/rules/measuring-text.md
Normal file
143
skills/remotion-best-practices/rules/measuring-text.md
Normal file
@ -0,0 +1,143 @@
|
||||
---
|
||||
name: measuring-text
|
||||
description: Measuring text dimensions, fitting text to containers, and checking overflow
|
||||
metadata:
|
||||
tags: measure, text, layout, dimensions, fitText, fillTextBox
|
||||
---
|
||||
|
||||
# Measuring text in Remotion
|
||||
|
||||
## Prerequisites
|
||||
|
||||
Install @remotion/layout-utils if it is not already installed:
|
||||
|
||||
```bash
|
||||
npx remotion add @remotion/layout-utils # If project uses npm
|
||||
bunx remotion add @remotion/layout-utils # If project uses bun
|
||||
yarn remotion add @remotion/layout-utils # If project uses yarn
|
||||
pnpm exec remotion add @remotion/layout-utils # If project uses pnpm
|
||||
```
|
||||
|
||||
## Measuring text dimensions
|
||||
|
||||
Use `measureText()` to calculate the width and height of text:
|
||||
|
||||
```tsx
|
||||
import { measureText } from "@remotion/layout-utils";
|
||||
|
||||
const { width, height } = measureText({
|
||||
text: "Hello World",
|
||||
fontFamily: "Arial",
|
||||
fontSize: 32,
|
||||
fontWeight: "bold",
|
||||
});
|
||||
```
|
||||
|
||||
Results are cached - duplicate calls return the cached result.
|
||||
|
||||
## Fitting text to a width
|
||||
|
||||
Use `fitText()` to find the optimal font size for a container:
|
||||
|
||||
```tsx
|
||||
import { fitText } from "@remotion/layout-utils";
|
||||
|
||||
const { fontSize } = fitText({
|
||||
text: "Hello World",
|
||||
withinWidth: 600,
|
||||
fontFamily: "Inter",
|
||||
fontWeight: "bold",
|
||||
});
|
||||
|
||||
return (
|
||||
<div
|
||||
style={{
|
||||
fontSize: Math.min(fontSize, 80), // Cap at 80px
|
||||
fontFamily: "Inter",
|
||||
fontWeight: "bold",
|
||||
}}
|
||||
>
|
||||
Hello World
|
||||
</div>
|
||||
);
|
||||
```
|
||||
|
||||
## Checking text overflow
|
||||
|
||||
Use `fillTextBox()` to check if text exceeds a box:
|
||||
|
||||
```tsx
|
||||
import { fillTextBox } from "@remotion/layout-utils";
|
||||
|
||||
const box = fillTextBox({ maxBoxWidth: 400, maxLines: 3 });
|
||||
|
||||
const words = ["Hello", "World", "This", "is", "a", "test"];
|
||||
for (const word of words) {
|
||||
const { exceedsBox } = box.add({
|
||||
text: word + " ",
|
||||
fontFamily: "Arial",
|
||||
fontSize: 24,
|
||||
});
|
||||
if (exceedsBox) {
|
||||
// Text would overflow, handle accordingly
|
||||
break;
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
## Best practices
|
||||
|
||||
**Load fonts first:** Only call measurement functions after fonts are loaded.
|
||||
|
||||
```tsx
|
||||
import { loadFont } from "@remotion/google-fonts/Inter";
|
||||
|
||||
const { fontFamily, waitUntilDone } = loadFont("normal", {
|
||||
weights: ["400"],
|
||||
subsets: ["latin"],
|
||||
});
|
||||
|
||||
waitUntilDone().then(() => {
|
||||
// Now safe to measure
|
||||
const { width } = measureText({
|
||||
text: "Hello",
|
||||
fontFamily,
|
||||
fontSize: 32,
|
||||
});
|
||||
})
|
||||
```
|
||||
|
||||
**Use validateFontIsLoaded:** Catch font loading issues early:
|
||||
|
||||
```tsx
|
||||
measureText({
|
||||
text: "Hello",
|
||||
fontFamily: "MyCustomFont",
|
||||
fontSize: 32,
|
||||
validateFontIsLoaded: true, // Throws if font not loaded
|
||||
});
|
||||
```
|
||||
|
||||
**Match font properties:** Use the same properties for measurement and rendering:
|
||||
|
||||
```tsx
|
||||
const fontStyle = {
|
||||
fontFamily: "Inter",
|
||||
fontSize: 32,
|
||||
fontWeight: "bold" as const,
|
||||
letterSpacing: "0.5px",
|
||||
};
|
||||
|
||||
const { width } = measureText({
|
||||
text: "Hello",
|
||||
...fontStyle,
|
||||
});
|
||||
|
||||
return <div style={fontStyle}>Hello</div>;
|
||||
```
|
||||
|
||||
**Avoid padding and border:** Use `outline` instead of `border` to prevent layout differences:
|
||||
|
||||
```tsx
|
||||
<div style={{ outline: "2px solid red" }}>Text</div>
|
||||
```
|
||||
106
skills/remotion-best-practices/rules/sequencing.md
Normal file
106
skills/remotion-best-practices/rules/sequencing.md
Normal file
@ -0,0 +1,106 @@
|
||||
---
|
||||
name: sequencing
|
||||
description: Sequencing patterns for Remotion - delay, trim, limit duration of items
|
||||
metadata:
|
||||
tags: sequence, series, timing, delay, trim
|
||||
---
|
||||
|
||||
Use `<Sequence>` to delay when an element appears in the timeline.
|
||||
|
||||
```tsx
|
||||
import { Sequence } from "remotion";
|
||||
|
||||
const {fps} = useVideoConfig();
|
||||
|
||||
<Sequence from={1 * fps} durationInFrames={2 * fps} premountFor={1 * fps}>
|
||||
<Title />
|
||||
</Sequence>
|
||||
<Sequence from={2 * fps} durationInFrames={2 * fps} premountFor={1 * fps}>
|
||||
<Subtitle />
|
||||
</Sequence>
|
||||
```
|
||||
|
||||
This will by default wrap the component in an absolute fill element.
|
||||
If the items should not be wrapped, use the `layout` prop:
|
||||
|
||||
```tsx
|
||||
<Sequence layout="none">
|
||||
<Title />
|
||||
</Sequence>
|
||||
```
|
||||
|
||||
## Premounting
|
||||
|
||||
This loads the component in the timeline before it is actually played.
|
||||
Always premount any `<Sequence>`!
|
||||
|
||||
```tsx
|
||||
<Sequence premountFor={1 * fps}>
|
||||
<Title />
|
||||
</Sequence>
|
||||
```
|
||||
|
||||
## Series
|
||||
|
||||
Use `<Series>` when elements should play one after another without overlap.
|
||||
|
||||
```tsx
|
||||
import {Series} from 'remotion';
|
||||
|
||||
<Series>
|
||||
<Series.Sequence durationInFrames={45}>
|
||||
<Intro />
|
||||
</Series.Sequence>
|
||||
<Series.Sequence durationInFrames={60}>
|
||||
<MainContent />
|
||||
</Series.Sequence>
|
||||
<Series.Sequence durationInFrames={30}>
|
||||
<Outro />
|
||||
</Series.Sequence>
|
||||
</Series>;
|
||||
```
|
||||
|
||||
Same as with `<Sequence>`, the items will be wrapped in an absolute fill element by default when using `<Series.Sequence>`, unless the `layout` prop is set to `none`.
|
||||
|
||||
### Series with overlaps
|
||||
|
||||
Use negative offset for overlapping sequences:
|
||||
|
||||
```tsx
|
||||
<Series>
|
||||
<Series.Sequence durationInFrames={60}>
|
||||
<SceneA />
|
||||
</Series.Sequence>
|
||||
<Series.Sequence offset={-15} durationInFrames={60}>
|
||||
{/* Starts 15 frames before SceneA ends */}
|
||||
<SceneB />
|
||||
</Series.Sequence>
|
||||
</Series>
|
||||
```
|
||||
|
||||
## Frame References Inside Sequences
|
||||
|
||||
Inside a Sequence, `useCurrentFrame()` returns the local frame (starting from 0):
|
||||
|
||||
```tsx
|
||||
<Sequence from={60} durationInFrames={30}>
|
||||
<MyComponent />
|
||||
{/* Inside MyComponent, useCurrentFrame() returns 0-29, not 60-89 */}
|
||||
</Sequence>
|
||||
```
|
||||
|
||||
## Nested Sequences
|
||||
|
||||
Sequences can be nested for complex timing:
|
||||
|
||||
```tsx
|
||||
<Sequence from={0} durationInFrames={120}>
|
||||
<Background />
|
||||
<Sequence from={15} durationInFrames={90} layout="none">
|
||||
<Title />
|
||||
</Sequence>
|
||||
<Sequence from={45} durationInFrames={60} layout="none">
|
||||
<Subtitle />
|
||||
</Sequence>
|
||||
</Sequence>
|
||||
```
|
||||
11
skills/remotion-best-practices/rules/tailwind.md
Normal file
11
skills/remotion-best-practices/rules/tailwind.md
Normal file
@ -0,0 +1,11 @@
|
||||
---
|
||||
name: tailwind
|
||||
description: Using TailwindCSS in Remotion.
|
||||
metadata:
|
||||
---
|
||||
|
||||
You can and should use TailwindCSS in Remotion, if TailwindCSS is installed in the project.
|
||||
|
||||
Don't use `transition-*` or `animate-*` classes - always animate using the `useCurrentFrame()` hook.
|
||||
|
||||
Tailwind must be installed and enabled first in a Remotion project - fetch https://www.remotion.dev/docs/tailwind using WebFetch for instructions.
|
||||
20
skills/remotion-best-practices/rules/text-animations.md
Normal file
20
skills/remotion-best-practices/rules/text-animations.md
Normal file
@ -0,0 +1,20 @@
|
||||
---
|
||||
name: text-animations
|
||||
description: Typography and text animation patterns for Remotion.
|
||||
metadata:
|
||||
tags: typography, text, typewriter, highlighter ken
|
||||
---
|
||||
|
||||
## Text animations
|
||||
|
||||
Based on `useCurrentFrame()`, reduce the string character by character to create a typewriter effect.
|
||||
|
||||
## Typewriter Effect
|
||||
|
||||
See [Typewriter](assets/text-animations-typewriter.tsx) for an advanced example with a blinking cursor and a pause after the first sentence.
|
||||
|
||||
Always use string slicing for typewriter effects. Never use per-character opacity.
|
||||
|
||||
## Word Highlighting
|
||||
|
||||
See [Word Highlight](assets/text-animations-word-highlight.tsx) for an example for how a word highlight is animated, like with a highlighter pen.
|
||||
179
skills/remotion-best-practices/rules/timing.md
Normal file
179
skills/remotion-best-practices/rules/timing.md
Normal file
@ -0,0 +1,179 @@
|
||||
---
|
||||
name: timing
|
||||
description: Interpolation curves in Remotion - linear, easing, spring animations
|
||||
metadata:
|
||||
tags: spring, bounce, easing, interpolation
|
||||
---
|
||||
|
||||
A simple linear interpolation is done using the `interpolate` function.
|
||||
|
||||
```ts title="Going from 0 to 1 over 100 frames"
|
||||
import {interpolate} from 'remotion';
|
||||
|
||||
const opacity = interpolate(frame, [0, 100], [0, 1]);
|
||||
```
|
||||
|
||||
By default, the values are not clamped, so the value can go outside the range [0, 1].
|
||||
Here is how they can be clamped:
|
||||
|
||||
```ts title="Going from 0 to 1 over 100 frames with extrapolation"
|
||||
const opacity = interpolate(frame, [0, 100], [0, 1], {
|
||||
extrapolateRight: 'clamp',
|
||||
extrapolateLeft: 'clamp',
|
||||
});
|
||||
```
|
||||
|
||||
## Spring animations
|
||||
|
||||
Spring animations have a more natural motion.
|
||||
They go from 0 to 1 over time.
|
||||
|
||||
```ts title="Spring animation from 0 to 1 over 100 frames"
|
||||
import {spring, useCurrentFrame, useVideoConfig} from 'remotion';
|
||||
|
||||
const frame = useCurrentFrame();
|
||||
const {fps} = useVideoConfig();
|
||||
|
||||
const scale = spring({
|
||||
frame,
|
||||
fps,
|
||||
});
|
||||
```
|
||||
|
||||
### Physical properties
|
||||
|
||||
The default configuration is: `mass: 1, damping: 10, stiffness: 100`.
|
||||
This leads to the animation having a bit of bounce before it settles.
|
||||
|
||||
The config can be overwritten like this:
|
||||
|
||||
```ts
|
||||
const scale = spring({
|
||||
frame,
|
||||
fps,
|
||||
config: {damping: 200},
|
||||
});
|
||||
```
|
||||
|
||||
The recommended configuration for a natural motion without a bounce is: `{ damping: 200 }`.
|
||||
|
||||
Here are some common configurations:
|
||||
|
||||
```tsx
|
||||
const smooth = {damping: 200}; // Smooth, no bounce (subtle reveals)
|
||||
const snappy = {damping: 20, stiffness: 200}; // Snappy, minimal bounce (UI elements)
|
||||
const bouncy = {damping: 8}; // Bouncy entrance (playful animations)
|
||||
const heavy = {damping: 15, stiffness: 80, mass: 2}; // Heavy, slow, small bounce
|
||||
```
|
||||
|
||||
### Delay
|
||||
|
||||
The animation starts immediately by default.
|
||||
Use the `delay` parameter to delay the animation by a number of frames.
|
||||
|
||||
```tsx
|
||||
const entrance = spring({
|
||||
frame: frame - ENTRANCE_DELAY,
|
||||
fps,
|
||||
delay: 20,
|
||||
});
|
||||
```
|
||||
|
||||
### Duration
|
||||
|
||||
A `spring()` has a natural duration based on the physical properties.
|
||||
To stretch the animation to a specific duration, use the `durationInFrames` parameter.
|
||||
|
||||
```tsx
|
||||
const spring = spring({
|
||||
frame,
|
||||
fps,
|
||||
durationInFrames: 40,
|
||||
});
|
||||
```
|
||||
|
||||
### Combining spring() with interpolate()
|
||||
|
||||
Map spring output (0-1) to custom ranges:
|
||||
|
||||
```tsx
|
||||
const springProgress = spring({
|
||||
frame,
|
||||
fps,
|
||||
});
|
||||
|
||||
// Map to rotation
|
||||
const rotation = interpolate(springProgress, [0, 1], [0, 360]);
|
||||
|
||||
<div style={{rotate: rotation + 'deg'}} />;
|
||||
```
|
||||
|
||||
### Adding springs
|
||||
|
||||
Springs return just numbers, so math can be performed:
|
||||
|
||||
```tsx
|
||||
const frame = useCurrentFrame();
|
||||
const {fps, durationInFrames} = useVideoConfig();
|
||||
|
||||
const inAnimation = spring({
|
||||
frame,
|
||||
fps,
|
||||
});
|
||||
const outAnimation = spring({
|
||||
frame,
|
||||
fps,
|
||||
durationInFrames: 1 * fps,
|
||||
delay: durationInFrames - 1 * fps,
|
||||
});
|
||||
|
||||
const scale = inAnimation - outAnimation;
|
||||
```
|
||||
|
||||
## Easing
|
||||
|
||||
Easing can be added to the `interpolate` function:
|
||||
|
||||
```ts
|
||||
import {interpolate, Easing} from 'remotion';
|
||||
|
||||
const value1 = interpolate(frame, [0, 100], [0, 1], {
|
||||
easing: Easing.inOut(Easing.quad),
|
||||
extrapolateLeft: 'clamp',
|
||||
extrapolateRight: 'clamp',
|
||||
});
|
||||
```
|
||||
|
||||
The default easing is `Easing.linear`.
|
||||
There are various other convexities:
|
||||
|
||||
- `Easing.in` for starting slow and accelerating
|
||||
- `Easing.out` for starting fast and slowing down
|
||||
- `Easing.inOut`
|
||||
|
||||
and curves (sorted from most linear to most curved):
|
||||
|
||||
- `Easing.quad`
|
||||
- `Easing.sin`
|
||||
- `Easing.exp`
|
||||
- `Easing.circle`
|
||||
|
||||
Convexities and curves need be combined for an easing function:
|
||||
|
||||
```ts
|
||||
const value1 = interpolate(frame, [0, 100], [0, 1], {
|
||||
easing: Easing.inOut(Easing.quad),
|
||||
extrapolateLeft: 'clamp',
|
||||
extrapolateRight: 'clamp',
|
||||
});
|
||||
```
|
||||
|
||||
Cubic bezier curves are also supported:
|
||||
|
||||
```ts
|
||||
const value1 = interpolate(frame, [0, 100], [0, 1], {
|
||||
easing: Easing.bezier(0.8, 0.22, 0.96, 0.65),
|
||||
extrapolateLeft: 'clamp',
|
||||
extrapolateRight: 'clamp',
|
||||
});
|
||||
```
|
||||
19
skills/remotion-best-practices/rules/transcribe-captions.md
Normal file
19
skills/remotion-best-practices/rules/transcribe-captions.md
Normal file
@ -0,0 +1,19 @@
|
||||
---
|
||||
name: transcribe-captions
|
||||
description: Transcribing audio to generate captions in Remotion
|
||||
metadata:
|
||||
tags: captions, transcribe, whisper, audio, speech-to-text
|
||||
---
|
||||
|
||||
# Transcribing audio
|
||||
|
||||
Remotion provides several built-in options for transcribing audio to generate captions:
|
||||
|
||||
- `@remotion/install-whisper-cpp` - Transcribe locally on a server using Whisper.cpp. Fast and free, but requires server infrastructure.
|
||||
https://remotion.dev/docs/install-whisper-cpp
|
||||
|
||||
- `@remotion/whisper-web` - Transcribe in the browser using WebAssembly. No server needed and free, but slower due to WASM overhead.
|
||||
https://remotion.dev/docs/whisper-web
|
||||
|
||||
- `@remotion/openai-whisper` - Use OpenAI Whisper API for cloud-based transcription. Fast and no server needed, but requires payment.
|
||||
https://remotion.dev/docs/openai-whisper/openai-whisper-api-to-captions
|
||||
122
skills/remotion-best-practices/rules/transitions.md
Normal file
122
skills/remotion-best-practices/rules/transitions.md
Normal file
@ -0,0 +1,122 @@
|
||||
---
|
||||
name: transitions
|
||||
description: Fullscreen scene transitions for Remotion.
|
||||
metadata:
|
||||
tags: transitions, fade, slide, wipe, scenes
|
||||
---
|
||||
|
||||
## Fullscreen transitions
|
||||
|
||||
Using `<TransitionSeries>` to animate between multiple scenes or clips.
|
||||
This will absolutely position the children.
|
||||
|
||||
## Prerequisites
|
||||
|
||||
First, the @remotion/transitions package needs to be installed.
|
||||
If it is not, use the following command:
|
||||
|
||||
```bash
|
||||
npx remotion add @remotion/transitions # If project uses npm
|
||||
bunx remotion add @remotion/transitions # If project uses bun
|
||||
yarn remotion add @remotion/transitions # If project uses yarn
|
||||
pnpm exec remotion add @remotion/transitions # If project uses pnpm
|
||||
```
|
||||
|
||||
## Example usage
|
||||
|
||||
```tsx
|
||||
import {TransitionSeries, linearTiming} from '@remotion/transitions';
|
||||
import {fade} from '@remotion/transitions/fade';
|
||||
|
||||
<TransitionSeries>
|
||||
<TransitionSeries.Sequence durationInFrames={60}>
|
||||
<SceneA />
|
||||
</TransitionSeries.Sequence>
|
||||
<TransitionSeries.Transition presentation={fade()} timing={linearTiming({durationInFrames: 15})} />
|
||||
<TransitionSeries.Sequence durationInFrames={60}>
|
||||
<SceneB />
|
||||
</TransitionSeries.Sequence>
|
||||
</TransitionSeries>;
|
||||
```
|
||||
|
||||
## Available Transition Types
|
||||
|
||||
Import transitions from their respective modules:
|
||||
|
||||
```tsx
|
||||
import {fade} from '@remotion/transitions/fade';
|
||||
import {slide} from '@remotion/transitions/slide';
|
||||
import {wipe} from '@remotion/transitions/wipe';
|
||||
import {flip} from '@remotion/transitions/flip';
|
||||
import {clockWipe} from '@remotion/transitions/clock-wipe';
|
||||
```
|
||||
|
||||
## Slide Transition with Direction
|
||||
|
||||
Specify slide direction for enter/exit animations.
|
||||
|
||||
```tsx
|
||||
import {slide} from '@remotion/transitions/slide';
|
||||
|
||||
<TransitionSeries.Transition presentation={slide({direction: 'from-left'})} timing={linearTiming({durationInFrames: 20})} />;
|
||||
```
|
||||
|
||||
Directions: `"from-left"`, `"from-right"`, `"from-top"`, `"from-bottom"`
|
||||
|
||||
## Timing Options
|
||||
|
||||
```tsx
|
||||
import {linearTiming, springTiming} from '@remotion/transitions';
|
||||
|
||||
// Linear timing - constant speed
|
||||
linearTiming({durationInFrames: 20});
|
||||
|
||||
// Spring timing - organic motion
|
||||
springTiming({config: {damping: 200}, durationInFrames: 25});
|
||||
```
|
||||
|
||||
## Duration calculation
|
||||
|
||||
Transitions overlap adjacent scenes, so the total composition length is **shorter** than the sum of all sequence durations.
|
||||
|
||||
For example, with two 60-frame sequences and a 15-frame transition:
|
||||
|
||||
- Without transitions: `60 + 60 = 120` frames
|
||||
- With transition: `60 + 60 - 15 = 105` frames
|
||||
|
||||
The transition duration is subtracted because both scenes play simultaneously during the transition.
|
||||
|
||||
### Getting the duration of a transition
|
||||
|
||||
Use the `getDurationInFrames()` method on the timing object:
|
||||
|
||||
```tsx
|
||||
import {linearTiming, springTiming} from '@remotion/transitions';
|
||||
|
||||
const linearDuration = linearTiming({durationInFrames: 20}).getDurationInFrames({fps: 30});
|
||||
// Returns 20
|
||||
|
||||
const springDuration = springTiming({config: {damping: 200}}).getDurationInFrames({fps: 30});
|
||||
// Returns calculated duration based on spring physics
|
||||
```
|
||||
|
||||
For `springTiming` without an explicit `durationInFrames`, the duration depends on `fps` because it calculates when the spring animation settles.
|
||||
|
||||
### Calculating total composition duration
|
||||
|
||||
```tsx
|
||||
import {linearTiming} from '@remotion/transitions';
|
||||
|
||||
const scene1Duration = 60;
|
||||
const scene2Duration = 60;
|
||||
const scene3Duration = 60;
|
||||
|
||||
const timing1 = linearTiming({durationInFrames: 15});
|
||||
const timing2 = linearTiming({durationInFrames: 20});
|
||||
|
||||
const transition1Duration = timing1.getDurationInFrames({fps: 30});
|
||||
const transition2Duration = timing2.getDurationInFrames({fps: 30});
|
||||
|
||||
const totalDuration = scene1Duration + scene2Duration + scene3Duration - transition1Duration - transition2Duration;
|
||||
// 60 + 60 + 60 - 15 - 20 = 145 frames
|
||||
```
|
||||
53
skills/remotion-best-practices/rules/trimming.md
Normal file
53
skills/remotion-best-practices/rules/trimming.md
Normal file
@ -0,0 +1,53 @@
|
||||
---
|
||||
name: trimming
|
||||
description: Trimming patterns for Remotion - cut the beginning or end of animations
|
||||
metadata:
|
||||
tags: sequence, trim, clip, cut, offset
|
||||
---
|
||||
|
||||
Use `<Sequence>` with a negative `from` value to trim the start of an animation.
|
||||
|
||||
## Trim the Beginning
|
||||
|
||||
A negative `from` value shifts time backwards, making the animation start partway through:
|
||||
|
||||
```tsx
|
||||
import { Sequence, useVideoConfig } from "remotion";
|
||||
|
||||
const fps = useVideoConfig();
|
||||
|
||||
<Sequence from={-0.5 * fps}>
|
||||
<MyAnimation />
|
||||
</Sequence>
|
||||
```
|
||||
|
||||
The animation appears 15 frames into its progress - the first 15 frames are trimmed off.
|
||||
Inside `<MyAnimation>`, `useCurrentFrame()` starts at 15 instead of 0.
|
||||
|
||||
## Trim the End
|
||||
|
||||
Use `durationInFrames` to unmount content after a specified duration:
|
||||
|
||||
```tsx
|
||||
|
||||
<Sequence durationInFrames={1.5 * fps}>
|
||||
<MyAnimation />
|
||||
</Sequence>
|
||||
```
|
||||
|
||||
The animation plays for 45 frames, then the component unmounts.
|
||||
|
||||
## Trim and Delay
|
||||
|
||||
Nest sequences to both trim the beginning and delay when it appears:
|
||||
|
||||
```tsx
|
||||
<Sequence from={30}>
|
||||
<Sequence from={-15}>
|
||||
<MyAnimation />
|
||||
</Sequence>
|
||||
</Sequence>
|
||||
```
|
||||
|
||||
The inner sequence trims 15 frames from the start, and the outer sequence delays the result by 30 frames.
|
||||
|
||||
171
skills/remotion-best-practices/rules/videos.md
Normal file
171
skills/remotion-best-practices/rules/videos.md
Normal file
@ -0,0 +1,171 @@
|
||||
---
|
||||
name: videos
|
||||
description: Embedding videos in Remotion - trimming, volume, speed, looping, pitch
|
||||
metadata:
|
||||
tags: video, media, trim, volume, speed, loop, pitch
|
||||
---
|
||||
|
||||
# Using videos in Remotion
|
||||
|
||||
## Prerequisites
|
||||
|
||||
First, the @remotion/media package needs to be installed.
|
||||
If it is not, use the following command:
|
||||
|
||||
```bash
|
||||
npx remotion add @remotion/media # If project uses npm
|
||||
bunx remotion add @remotion/media # If project uses bun
|
||||
yarn remotion add @remotion/media # If project uses yarn
|
||||
pnpm exec remotion add @remotion/media # If project uses pnpm
|
||||
```
|
||||
|
||||
Use `<Video>` from `@remotion/media` to embed videos into your composition.
|
||||
|
||||
```tsx
|
||||
import { Video } from "@remotion/media";
|
||||
import { staticFile } from "remotion";
|
||||
|
||||
export const MyComposition = () => {
|
||||
return <Video src={staticFile("video.mp4")} />;
|
||||
};
|
||||
```
|
||||
|
||||
Remote URLs are also supported:
|
||||
|
||||
```tsx
|
||||
<Video src="https://remotion.media/video.mp4" />
|
||||
```
|
||||
|
||||
## Trimming
|
||||
|
||||
Use `trimBefore` and `trimAfter` to remove portions of the video. Values are in seconds.
|
||||
|
||||
```tsx
|
||||
const { fps } = useVideoConfig();
|
||||
|
||||
return (
|
||||
<Video
|
||||
src={staticFile("video.mp4")}
|
||||
trimBefore={2 * fps} // Skip the first 2 seconds
|
||||
trimAfter={10 * fps} // End at the 10 second mark
|
||||
/>
|
||||
);
|
||||
```
|
||||
|
||||
## Delaying
|
||||
|
||||
Wrap the video in a `<Sequence>` to delay when it appears:
|
||||
|
||||
```tsx
|
||||
import { Sequence, staticFile } from "remotion";
|
||||
import { Video } from "@remotion/media";
|
||||
|
||||
const { fps } = useVideoConfig();
|
||||
|
||||
return (
|
||||
<Sequence from={1 * fps}>
|
||||
<Video src={staticFile("video.mp4")} />
|
||||
</Sequence>
|
||||
);
|
||||
```
|
||||
|
||||
The video will appear after 1 second.
|
||||
|
||||
## Sizing and Position
|
||||
|
||||
Use the `style` prop to control size and position:
|
||||
|
||||
```tsx
|
||||
<Video
|
||||
src={staticFile("video.mp4")}
|
||||
style={{
|
||||
width: 500,
|
||||
height: 300,
|
||||
position: "absolute",
|
||||
top: 100,
|
||||
left: 50,
|
||||
objectFit: "cover",
|
||||
}}
|
||||
/>
|
||||
```
|
||||
|
||||
## Volume
|
||||
|
||||
Set a static volume (0 to 1):
|
||||
|
||||
```tsx
|
||||
<Video src={staticFile("video.mp4")} volume={0.5} />
|
||||
```
|
||||
|
||||
Or use a callback for dynamic volume based on the current frame:
|
||||
|
||||
```tsx
|
||||
import { interpolate } from "remotion";
|
||||
|
||||
const { fps } = useVideoConfig();
|
||||
|
||||
return (
|
||||
<Video
|
||||
src={staticFile("video.mp4")}
|
||||
volume={(f) =>
|
||||
interpolate(f, [0, 1 * fps], [0, 1], { extrapolateRight: "clamp" })
|
||||
}
|
||||
/>
|
||||
);
|
||||
```
|
||||
|
||||
Use `muted` to silence the video entirely:
|
||||
|
||||
```tsx
|
||||
<Video src={staticFile("video.mp4")} muted />
|
||||
```
|
||||
|
||||
## Speed
|
||||
|
||||
Use `playbackRate` to change the playback speed:
|
||||
|
||||
```tsx
|
||||
<Video src={staticFile("video.mp4")} playbackRate={2} /> {/* 2x speed */}
|
||||
<Video src={staticFile("video.mp4")} playbackRate={0.5} /> {/* Half speed */}
|
||||
```
|
||||
|
||||
Reverse playback is not supported.
|
||||
|
||||
## Looping
|
||||
|
||||
Use `loop` to loop the video indefinitely:
|
||||
|
||||
```tsx
|
||||
<Video src={staticFile("video.mp4")} loop />
|
||||
```
|
||||
|
||||
Use `loopVolumeCurveBehavior` to control how the frame count behaves when looping:
|
||||
|
||||
- `"repeat"`: Frame count resets to 0 each loop (for `volume` callback)
|
||||
- `"extend"`: Frame count continues incrementing
|
||||
|
||||
```tsx
|
||||
<Video
|
||||
src={staticFile("video.mp4")}
|
||||
loop
|
||||
loopVolumeCurveBehavior="extend"
|
||||
volume={(f) => interpolate(f, [0, 300], [1, 0])} // Fade out over multiple loops
|
||||
/>
|
||||
```
|
||||
|
||||
## Pitch
|
||||
|
||||
Use `toneFrequency` to adjust the pitch without affecting speed. Values range from 0.01 to 2:
|
||||
|
||||
```tsx
|
||||
<Video
|
||||
src={staticFile("video.mp4")}
|
||||
toneFrequency={1.5} // Higher pitch
|
||||
/>
|
||||
<Video
|
||||
src={staticFile("video.mp4")}
|
||||
toneFrequency={0.8} // Lower pitch
|
||||
/>
|
||||
```
|
||||
|
||||
Pitch shifting only works during server-side rendering, not in the Remotion Studio preview or in the `<Player />`.
|
||||
142
skills/reverse-engineering-tools/SKILL.md
Normal file
142
skills/reverse-engineering-tools/SKILL.md
Normal file
@ -0,0 +1,142 @@
|
||||
---
|
||||
name: reverse-engineering-tools
|
||||
description: Guide for reverse engineering tools and techniques used in game security research. Use this skill when working with debuggers, disassemblers, memory analysis tools, binary analysis, or decompilers for game security research.
|
||||
---
|
||||
|
||||
# Reverse Engineering Tools & Techniques
|
||||
|
||||
## Overview
|
||||
|
||||
This skill covers reverse engineering resources for game security research, including debuggers, disassemblers, memory analysis tools, and specialized game hacking utilities.
|
||||
|
||||
## Debugging Tools
|
||||
|
||||
### Windows Debuggers
|
||||
- **Cheat Engine**: Memory scanner and debugger for games
|
||||
- **x64dbg**: Open-source x86/x64 debugger
|
||||
- **WinDbg**: Microsoft's kernel/user-mode debugger
|
||||
- **ReClass.NET**: Memory structure reconstruction
|
||||
- **HyperDbg**: Hypervisor-based debugger
|
||||
|
||||
### Specialized Debuggers
|
||||
- **CE Mono Helper**: Unity/Mono game debugging
|
||||
- **dnSpy**: .NET assembly debugger/decompiler
|
||||
- **ILSpy**: .NET decompiler
|
||||
- **frida**: Dynamic instrumentation toolkit
|
||||
|
||||
### Platform-Specific
|
||||
- **edb-debugger**: Linux debugger
|
||||
- **PINCE**: Linux game hacking tool
|
||||
- **H5GG**: iOS cheat engine
|
||||
- **Hardware Breakpoint Tools**: HWBP implementations
|
||||
|
||||
## Disassembly & Decompilation
|
||||
|
||||
### Multi-Platform
|
||||
- **IDA Pro**: Industry standard disassembler
|
||||
- **Ghidra**: NSA's reverse engineering framework
|
||||
- **Binary Ninja**: Modern RE platform
|
||||
- **Cutter**: Radare2 GUI
|
||||
|
||||
### Specialized Tools
|
||||
- **IL2CPP Dumper**: Unity IL2CPP analysis
|
||||
- **dnSpy**: .NET/Unity decompilation
|
||||
- **jadx**: Android DEX decompiler
|
||||
- **Recaf**: Java bytecode editor
|
||||
|
||||
## Memory Analysis
|
||||
|
||||
### Memory Scanners
|
||||
```
|
||||
- Cheat Engine: Pattern scanning, value searching
|
||||
- ReClass.NET: Structure reconstruction
|
||||
- Process Hacker: System analysis
|
||||
```
|
||||
|
||||
### Dump Tools
|
||||
```
|
||||
- KsDumper: Kernel-space process dumping
|
||||
- PE-bear: PE file analysis
|
||||
- ImHex: Hex editor for RE
|
||||
```
|
||||
|
||||
## Dynamic Binary Instrumentation (DBI)
|
||||
|
||||
### Frameworks
|
||||
- **Frida**: Cross-platform DBI
|
||||
- **DynamoRIO**: Runtime code manipulation
|
||||
- **Pin**: Intel's DBI framework
|
||||
- **TinyInst**: Lightweight instrumentation
|
||||
- **QBDI**: QuarkslaB DBI
|
||||
|
||||
### Use Cases
|
||||
1. API hooking and tracing
|
||||
2. Code coverage analysis
|
||||
3. Fuzzing harness creation
|
||||
4. Behavioral analysis
|
||||
|
||||
## Anti-Analysis Bypass
|
||||
|
||||
### Techniques
|
||||
- Anti-debug detection bypass
|
||||
- VM/Sandbox evasion
|
||||
- Timing attack mitigation
|
||||
- PatchGuard circumvention
|
||||
|
||||
### Tools
|
||||
- **TitanHide**: Anti-debug hiding
|
||||
- **HyperHide**: Hypervisor-based hiding
|
||||
- **ScyllaHide**: Anti-anti-debug plugin
|
||||
|
||||
## Game-Specific Analysis
|
||||
|
||||
### Unity Games
|
||||
1. Locate `GameAssembly.dll` (IL2CPP) or managed DLLs
|
||||
2. Use IL2CPP Dumper for structure recovery
|
||||
3. Apply dnSpy for Mono games
|
||||
4. Hook via Unity-specific frameworks
|
||||
|
||||
### Unreal Engine Games
|
||||
1. Identify UE version from signatures
|
||||
2. Use SDK generators (Dumper-7)
|
||||
3. Analyze Blueprint bytecode
|
||||
4. Hook UObject/UFunction systems
|
||||
|
||||
### Native Games
|
||||
1. Standard PE analysis
|
||||
2. Import/export reconstruction
|
||||
3. Pattern scanning for signatures
|
||||
4. Runtime memory analysis
|
||||
|
||||
## Workflow Best Practices
|
||||
|
||||
### Initial Analysis
|
||||
```
|
||||
1. Identify protections (packer, obfuscator, anti-cheat)
|
||||
2. Determine game engine and version
|
||||
3. Collect symbol information if available
|
||||
4. Map out key modules and dependencies
|
||||
```
|
||||
|
||||
### Deep Analysis
|
||||
```
|
||||
1. Locate target functionality
|
||||
2. Trace execution flow
|
||||
3. Document structures and relationships
|
||||
4. Develop hooking strategy
|
||||
```
|
||||
|
||||
## VMProtect/Themida Analysis
|
||||
|
||||
### Resources
|
||||
- Devirtualization tools
|
||||
- Control flow recovery
|
||||
- Handler analysis techniques
|
||||
- Unpacking methodologies
|
||||
|
||||
## ROP/Exploit Development
|
||||
|
||||
### Tools
|
||||
- **ROPgadget**: Gadget finder
|
||||
- **rp++**: Fast ROP gadget finder
|
||||
- **angrop**: Automated ROP chain generation
|
||||
202
skills/skill-creator/LICENSE.txt
Normal file
202
skills/skill-creator/LICENSE.txt
Normal file
@ -0,0 +1,202 @@
|
||||
|
||||
Apache License
|
||||
Version 2.0, January 2004
|
||||
http://www.apache.org/licenses/
|
||||
|
||||
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
|
||||
|
||||
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|
||||
|
||||
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|
||||
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|
||||
|
||||
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|
||||
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|
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|
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|
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|
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|
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|
||||
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|
||||
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|
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|
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356
skills/skill-creator/SKILL.md
Normal file
356
skills/skill-creator/SKILL.md
Normal file
@ -0,0 +1,356 @@
|
||||
---
|
||||
name: skill-creator
|
||||
description: Guide for creating effective skills. This skill should be used when users want to create a new skill (or update an existing skill) that extends Claude's capabilities with specialized knowledge, workflows, or tool integrations.
|
||||
license: Complete terms in LICENSE.txt
|
||||
---
|
||||
|
||||
# Skill Creator
|
||||
|
||||
This skill provides guidance for creating effective skills.
|
||||
|
||||
## About Skills
|
||||
|
||||
Skills are modular, self-contained packages that extend Claude's capabilities by providing
|
||||
specialized knowledge, workflows, and tools. Think of them as "onboarding guides" for specific
|
||||
domains or tasks—they transform Claude from a general-purpose agent into a specialized agent
|
||||
equipped with procedural knowledge that no model can fully possess.
|
||||
|
||||
### What Skills Provide
|
||||
|
||||
1. Specialized workflows - Multi-step procedures for specific domains
|
||||
2. Tool integrations - Instructions for working with specific file formats or APIs
|
||||
3. Domain expertise - Company-specific knowledge, schemas, business logic
|
||||
4. Bundled resources - Scripts, references, and assets for complex and repetitive tasks
|
||||
|
||||
## Core Principles
|
||||
|
||||
### Concise is Key
|
||||
|
||||
The context window is a public good. Skills share the context window with everything else Claude needs: system prompt, conversation history, other Skills' metadata, and the actual user request.
|
||||
|
||||
**Default assumption: Claude is already very smart.** Only add context Claude doesn't already have. Challenge each piece of information: "Does Claude really need this explanation?" and "Does this paragraph justify its token cost?"
|
||||
|
||||
Prefer concise examples over verbose explanations.
|
||||
|
||||
### Set Appropriate Degrees of Freedom
|
||||
|
||||
Match the level of specificity to the task's fragility and variability:
|
||||
|
||||
**High freedom (text-based instructions)**: Use when multiple approaches are valid, decisions depend on context, or heuristics guide the approach.
|
||||
|
||||
**Medium freedom (pseudocode or scripts with parameters)**: Use when a preferred pattern exists, some variation is acceptable, or configuration affects behavior.
|
||||
|
||||
**Low freedom (specific scripts, few parameters)**: Use when operations are fragile and error-prone, consistency is critical, or a specific sequence must be followed.
|
||||
|
||||
Think of Claude as exploring a path: a narrow bridge with cliffs needs specific guardrails (low freedom), while an open field allows many routes (high freedom).
|
||||
|
||||
### Anatomy of a Skill
|
||||
|
||||
Every skill consists of a required SKILL.md file and optional bundled resources:
|
||||
|
||||
```
|
||||
skill-name/
|
||||
├── SKILL.md (required)
|
||||
│ ├── YAML frontmatter metadata (required)
|
||||
│ │ ├── name: (required)
|
||||
│ │ └── description: (required)
|
||||
│ └── Markdown instructions (required)
|
||||
└── Bundled Resources (optional)
|
||||
├── scripts/ - Executable code (Python/Bash/etc.)
|
||||
├── references/ - Documentation intended to be loaded into context as needed
|
||||
└── assets/ - Files used in output (templates, icons, fonts, etc.)
|
||||
```
|
||||
|
||||
#### SKILL.md (required)
|
||||
|
||||
Every SKILL.md consists of:
|
||||
|
||||
- **Frontmatter** (YAML): Contains `name` and `description` fields. These are the only fields that Claude reads to determine when the skill gets used, thus it is very important to be clear and comprehensive in describing what the skill is, and when it should be used.
|
||||
- **Body** (Markdown): Instructions and guidance for using the skill. Only loaded AFTER the skill triggers (if at all).
|
||||
|
||||
#### Bundled Resources (optional)
|
||||
|
||||
##### Scripts (`scripts/`)
|
||||
|
||||
Executable code (Python/Bash/etc.) for tasks that require deterministic reliability or are repeatedly rewritten.
|
||||
|
||||
- **When to include**: When the same code is being rewritten repeatedly or deterministic reliability is needed
|
||||
- **Example**: `scripts/rotate_pdf.py` for PDF rotation tasks
|
||||
- **Benefits**: Token efficient, deterministic, may be executed without loading into context
|
||||
- **Note**: Scripts may still need to be read by Claude for patching or environment-specific adjustments
|
||||
|
||||
##### References (`references/`)
|
||||
|
||||
Documentation and reference material intended to be loaded as needed into context to inform Claude's process and thinking.
|
||||
|
||||
- **When to include**: For documentation that Claude should reference while working
|
||||
- **Examples**: `references/finance.md` for financial schemas, `references/mnda.md` for company NDA template, `references/policies.md` for company policies, `references/api_docs.md` for API specifications
|
||||
- **Use cases**: Database schemas, API documentation, domain knowledge, company policies, detailed workflow guides
|
||||
- **Benefits**: Keeps SKILL.md lean, loaded only when Claude determines it's needed
|
||||
- **Best practice**: If files are large (>10k words), include grep search patterns in SKILL.md
|
||||
- **Avoid duplication**: Information should live in either SKILL.md or references files, not both. Prefer references files for detailed information unless it's truly core to the skill—this keeps SKILL.md lean while making information discoverable without hogging the context window. Keep only essential procedural instructions and workflow guidance in SKILL.md; move detailed reference material, schemas, and examples to references files.
|
||||
|
||||
##### Assets (`assets/`)
|
||||
|
||||
Files not intended to be loaded into context, but rather used within the output Claude produces.
|
||||
|
||||
- **When to include**: When the skill needs files that will be used in the final output
|
||||
- **Examples**: `assets/logo.png` for brand assets, `assets/slides.pptx` for PowerPoint templates, `assets/frontend-template/` for HTML/React boilerplate, `assets/font.ttf` for typography
|
||||
- **Use cases**: Templates, images, icons, boilerplate code, fonts, sample documents that get copied or modified
|
||||
- **Benefits**: Separates output resources from documentation, enables Claude to use files without loading them into context
|
||||
|
||||
#### What to Not Include in a Skill
|
||||
|
||||
A skill should only contain essential files that directly support its functionality. Do NOT create extraneous documentation or auxiliary files, including:
|
||||
|
||||
- README.md
|
||||
- INSTALLATION_GUIDE.md
|
||||
- QUICK_REFERENCE.md
|
||||
- CHANGELOG.md
|
||||
- etc.
|
||||
|
||||
The skill should only contain the information needed for an AI agent to do the job at hand. It should not contain auxilary context about the process that went into creating it, setup and testing procedures, user-facing documentation, etc. Creating additional documentation files just adds clutter and confusion.
|
||||
|
||||
### Progressive Disclosure Design Principle
|
||||
|
||||
Skills use a three-level loading system to manage context efficiently:
|
||||
|
||||
1. **Metadata (name + description)** - Always in context (~100 words)
|
||||
2. **SKILL.md body** - When skill triggers (<5k words)
|
||||
3. **Bundled resources** - As needed by Claude (Unlimited because scripts can be executed without reading into context window)
|
||||
|
||||
#### Progressive Disclosure Patterns
|
||||
|
||||
Keep SKILL.md body to the essentials and under 500 lines to minimize context bloat. Split content into separate files when approaching this limit. When splitting out content into other files, it is very important to reference them from SKILL.md and describe clearly when to read them, to ensure the reader of the skill knows they exist and when to use them.
|
||||
|
||||
**Key principle:** When a skill supports multiple variations, frameworks, or options, keep only the core workflow and selection guidance in SKILL.md. Move variant-specific details (patterns, examples, configuration) into separate reference files.
|
||||
|
||||
**Pattern 1: High-level guide with references**
|
||||
|
||||
```markdown
|
||||
# PDF Processing
|
||||
|
||||
## Quick start
|
||||
|
||||
Extract text with pdfplumber:
|
||||
[code example]
|
||||
|
||||
## Advanced features
|
||||
|
||||
- **Form filling**: See [FORMS.md](FORMS.md) for complete guide
|
||||
- **API reference**: See [REFERENCE.md](REFERENCE.md) for all methods
|
||||
- **Examples**: See [EXAMPLES.md](EXAMPLES.md) for common patterns
|
||||
```
|
||||
|
||||
Claude loads FORMS.md, REFERENCE.md, or EXAMPLES.md only when needed.
|
||||
|
||||
**Pattern 2: Domain-specific organization**
|
||||
|
||||
For Skills with multiple domains, organize content by domain to avoid loading irrelevant context:
|
||||
|
||||
```
|
||||
bigquery-skill/
|
||||
├── SKILL.md (overview and navigation)
|
||||
└── reference/
|
||||
├── finance.md (revenue, billing metrics)
|
||||
├── sales.md (opportunities, pipeline)
|
||||
├── product.md (API usage, features)
|
||||
└── marketing.md (campaigns, attribution)
|
||||
```
|
||||
|
||||
When a user asks about sales metrics, Claude only reads sales.md.
|
||||
|
||||
Similarly, for skills supporting multiple frameworks or variants, organize by variant:
|
||||
|
||||
```
|
||||
cloud-deploy/
|
||||
├── SKILL.md (workflow + provider selection)
|
||||
└── references/
|
||||
├── aws.md (AWS deployment patterns)
|
||||
├── gcp.md (GCP deployment patterns)
|
||||
└── azure.md (Azure deployment patterns)
|
||||
```
|
||||
|
||||
When the user chooses AWS, Claude only reads aws.md.
|
||||
|
||||
**Pattern 3: Conditional details**
|
||||
|
||||
Show basic content, link to advanced content:
|
||||
|
||||
```markdown
|
||||
# DOCX Processing
|
||||
|
||||
## Creating documents
|
||||
|
||||
Use docx-js for new documents. See [DOCX-JS.md](DOCX-JS.md).
|
||||
|
||||
## Editing documents
|
||||
|
||||
For simple edits, modify the XML directly.
|
||||
|
||||
**For tracked changes**: See [REDLINING.md](REDLINING.md)
|
||||
**For OOXML details**: See [OOXML.md](OOXML.md)
|
||||
```
|
||||
|
||||
Claude reads REDLINING.md or OOXML.md only when the user needs those features.
|
||||
|
||||
**Important guidelines:**
|
||||
|
||||
- **Avoid deeply nested references** - Keep references one level deep from SKILL.md. All reference files should link directly from SKILL.md.
|
||||
- **Structure longer reference files** - For files longer than 100 lines, include a table of contents at the top so Claude can see the full scope when previewing.
|
||||
|
||||
## Skill Creation Process
|
||||
|
||||
Skill creation involves these steps:
|
||||
|
||||
1. Understand the skill with concrete examples
|
||||
2. Plan reusable skill contents (scripts, references, assets)
|
||||
3. Initialize the skill (run init_skill.py)
|
||||
4. Edit the skill (implement resources and write SKILL.md)
|
||||
5. Package the skill (run package_skill.py)
|
||||
6. Iterate based on real usage
|
||||
|
||||
Follow these steps in order, skipping only if there is a clear reason why they are not applicable.
|
||||
|
||||
### Step 1: Understanding the Skill with Concrete Examples
|
||||
|
||||
Skip this step only when the skill's usage patterns are already clearly understood. It remains valuable even when working with an existing skill.
|
||||
|
||||
To create an effective skill, clearly understand concrete examples of how the skill will be used. This understanding can come from either direct user examples or generated examples that are validated with user feedback.
|
||||
|
||||
For example, when building an image-editor skill, relevant questions include:
|
||||
|
||||
- "What functionality should the image-editor skill support? Editing, rotating, anything else?"
|
||||
- "Can you give some examples of how this skill would be used?"
|
||||
- "I can imagine users asking for things like 'Remove the red-eye from this image' or 'Rotate this image'. Are there other ways you imagine this skill being used?"
|
||||
- "What would a user say that should trigger this skill?"
|
||||
|
||||
To avoid overwhelming users, avoid asking too many questions in a single message. Start with the most important questions and follow up as needed for better effectiveness.
|
||||
|
||||
Conclude this step when there is a clear sense of the functionality the skill should support.
|
||||
|
||||
### Step 2: Planning the Reusable Skill Contents
|
||||
|
||||
To turn concrete examples into an effective skill, analyze each example by:
|
||||
|
||||
1. Considering how to execute on the example from scratch
|
||||
2. Identifying what scripts, references, and assets would be helpful when executing these workflows repeatedly
|
||||
|
||||
Example: When building a `pdf-editor` skill to handle queries like "Help me rotate this PDF," the analysis shows:
|
||||
|
||||
1. Rotating a PDF requires re-writing the same code each time
|
||||
2. A `scripts/rotate_pdf.py` script would be helpful to store in the skill
|
||||
|
||||
Example: When designing a `frontend-webapp-builder` skill for queries like "Build me a todo app" or "Build me a dashboard to track my steps," the analysis shows:
|
||||
|
||||
1. Writing a frontend webapp requires the same boilerplate HTML/React each time
|
||||
2. An `assets/hello-world/` template containing the boilerplate HTML/React project files would be helpful to store in the skill
|
||||
|
||||
Example: When building a `big-query` skill to handle queries like "How many users have logged in today?" the analysis shows:
|
||||
|
||||
1. Querying BigQuery requires re-discovering the table schemas and relationships each time
|
||||
2. A `references/schema.md` file documenting the table schemas would be helpful to store in the skill
|
||||
|
||||
To establish the skill's contents, analyze each concrete example to create a list of the reusable resources to include: scripts, references, and assets.
|
||||
|
||||
### Step 3: Initializing the Skill
|
||||
|
||||
At this point, it is time to actually create the skill.
|
||||
|
||||
Skip this step only if the skill being developed already exists, and iteration or packaging is needed. In this case, continue to the next step.
|
||||
|
||||
When creating a new skill from scratch, always run the `init_skill.py` script. The script conveniently generates a new template skill directory that automatically includes everything a skill requires, making the skill creation process much more efficient and reliable.
|
||||
|
||||
Usage:
|
||||
|
||||
```bash
|
||||
scripts/init_skill.py <skill-name> --path <output-directory>
|
||||
```
|
||||
|
||||
The script:
|
||||
|
||||
- Creates the skill directory at the specified path
|
||||
- Generates a SKILL.md template with proper frontmatter and TODO placeholders
|
||||
- Creates example resource directories: `scripts/`, `references/`, and `assets/`
|
||||
- Adds example files in each directory that can be customized or deleted
|
||||
|
||||
After initialization, customize or remove the generated SKILL.md and example files as needed.
|
||||
|
||||
### Step 4: Edit the Skill
|
||||
|
||||
When editing the (newly-generated or existing) skill, remember that the skill is being created for another instance of Claude to use. Include information that would be beneficial and non-obvious to Claude. Consider what procedural knowledge, domain-specific details, or reusable assets would help another Claude instance execute these tasks more effectively.
|
||||
|
||||
#### Learn Proven Design Patterns
|
||||
|
||||
Consult these helpful guides based on your skill's needs:
|
||||
|
||||
- **Multi-step processes**: See references/workflows.md for sequential workflows and conditional logic
|
||||
- **Specific output formats or quality standards**: See references/output-patterns.md for template and example patterns
|
||||
|
||||
These files contain established best practices for effective skill design.
|
||||
|
||||
#### Start with Reusable Skill Contents
|
||||
|
||||
To begin implementation, start with the reusable resources identified above: `scripts/`, `references/`, and `assets/` files. Note that this step may require user input. For example, when implementing a `brand-guidelines` skill, the user may need to provide brand assets or templates to store in `assets/`, or documentation to store in `references/`.
|
||||
|
||||
Added scripts must be tested by actually running them to ensure there are no bugs and that the output matches what is expected. If there are many similar scripts, only a representative sample needs to be tested to ensure confidence that they all work while balancing time to completion.
|
||||
|
||||
Any example files and directories not needed for the skill should be deleted. The initialization script creates example files in `scripts/`, `references/`, and `assets/` to demonstrate structure, but most skills won't need all of them.
|
||||
|
||||
#### Update SKILL.md
|
||||
|
||||
**Writing Guidelines:** Always use imperative/infinitive form.
|
||||
|
||||
##### Frontmatter
|
||||
|
||||
Write the YAML frontmatter with `name` and `description`:
|
||||
|
||||
- `name`: The skill name
|
||||
- `description`: This is the primary triggering mechanism for your skill, and helps Claude understand when to use the skill.
|
||||
- Include both what the Skill does and specific triggers/contexts for when to use it.
|
||||
- Include all "when to use" information here - Not in the body. The body is only loaded after triggering, so "When to Use This Skill" sections in the body are not helpful to Claude.
|
||||
- Example description for a `docx` skill: "Comprehensive document creation, editing, and analysis with support for tracked changes, comments, formatting preservation, and text extraction. Use when Claude needs to work with professional documents (.docx files) for: (1) Creating new documents, (2) Modifying or editing content, (3) Working with tracked changes, (4) Adding comments, or any other document tasks"
|
||||
|
||||
Do not include any other fields in YAML frontmatter.
|
||||
|
||||
##### Body
|
||||
|
||||
Write instructions for using the skill and its bundled resources.
|
||||
|
||||
### Step 5: Packaging a Skill
|
||||
|
||||
Once development of the skill is complete, it must be packaged into a distributable .skill file that gets shared with the user. The packaging process automatically validates the skill first to ensure it meets all requirements:
|
||||
|
||||
```bash
|
||||
scripts/package_skill.py <path/to/skill-folder>
|
||||
```
|
||||
|
||||
Optional output directory specification:
|
||||
|
||||
```bash
|
||||
scripts/package_skill.py <path/to/skill-folder> ./dist
|
||||
```
|
||||
|
||||
The packaging script will:
|
||||
|
||||
1. **Validate** the skill automatically, checking:
|
||||
|
||||
- YAML frontmatter format and required fields
|
||||
- Skill naming conventions and directory structure
|
||||
- Description completeness and quality
|
||||
- File organization and resource references
|
||||
|
||||
2. **Package** the skill if validation passes, creating a .skill file named after the skill (e.g., `my-skill.skill`) that includes all files and maintains the proper directory structure for distribution. The .skill file is a zip file with a .skill extension.
|
||||
|
||||
If validation fails, the script will report the errors and exit without creating a package. Fix any validation errors and run the packaging command again.
|
||||
|
||||
### Step 6: Iterate
|
||||
|
||||
After testing the skill, users may request improvements. Often this happens right after using the skill, with fresh context of how the skill performed.
|
||||
|
||||
**Iteration workflow:**
|
||||
|
||||
1. Use the skill on real tasks
|
||||
2. Notice struggles or inefficiencies
|
||||
3. Identify how SKILL.md or bundled resources should be updated
|
||||
4. Implement changes and test again
|
||||
82
skills/skill-creator/references/output-patterns.md
Normal file
82
skills/skill-creator/references/output-patterns.md
Normal file
@ -0,0 +1,82 @@
|
||||
# Output Patterns
|
||||
|
||||
Use these patterns when skills need to produce consistent, high-quality output.
|
||||
|
||||
## Template Pattern
|
||||
|
||||
Provide templates for output format. Match the level of strictness to your needs.
|
||||
|
||||
**For strict requirements (like API responses or data formats):**
|
||||
|
||||
```markdown
|
||||
## Report structure
|
||||
|
||||
ALWAYS use this exact template structure:
|
||||
|
||||
# [Analysis Title]
|
||||
|
||||
## Executive summary
|
||||
[One-paragraph overview of key findings]
|
||||
|
||||
## Key findings
|
||||
- Finding 1 with supporting data
|
||||
- Finding 2 with supporting data
|
||||
- Finding 3 with supporting data
|
||||
|
||||
## Recommendations
|
||||
1. Specific actionable recommendation
|
||||
2. Specific actionable recommendation
|
||||
```
|
||||
|
||||
**For flexible guidance (when adaptation is useful):**
|
||||
|
||||
```markdown
|
||||
## Report structure
|
||||
|
||||
Here is a sensible default format, but use your best judgment:
|
||||
|
||||
# [Analysis Title]
|
||||
|
||||
## Executive summary
|
||||
[Overview]
|
||||
|
||||
## Key findings
|
||||
[Adapt sections based on what you discover]
|
||||
|
||||
## Recommendations
|
||||
[Tailor to the specific context]
|
||||
|
||||
Adjust sections as needed for the specific analysis type.
|
||||
```
|
||||
|
||||
## Examples Pattern
|
||||
|
||||
For skills where output quality depends on seeing examples, provide input/output pairs:
|
||||
|
||||
```markdown
|
||||
## Commit message format
|
||||
|
||||
Generate commit messages following these examples:
|
||||
|
||||
**Example 1:**
|
||||
Input: Added user authentication with JWT tokens
|
||||
Output:
|
||||
```
|
||||
feat(auth): implement JWT-based authentication
|
||||
|
||||
Add login endpoint and token validation middleware
|
||||
```
|
||||
|
||||
**Example 2:**
|
||||
Input: Fixed bug where dates displayed incorrectly in reports
|
||||
Output:
|
||||
```
|
||||
fix(reports): correct date formatting in timezone conversion
|
||||
|
||||
Use UTC timestamps consistently across report generation
|
||||
```
|
||||
|
||||
Follow this style: type(scope): brief description, then detailed explanation.
|
||||
```
|
||||
|
||||
Examples help Claude understand the desired style and level of detail more clearly than descriptions alone.
|
||||
28
skills/skill-creator/references/workflows.md
Normal file
28
skills/skill-creator/references/workflows.md
Normal file
@ -0,0 +1,28 @@
|
||||
# Workflow Patterns
|
||||
|
||||
## Sequential Workflows
|
||||
|
||||
For complex tasks, break operations into clear, sequential steps. It is often helpful to give Claude an overview of the process towards the beginning of SKILL.md:
|
||||
|
||||
```markdown
|
||||
Filling a PDF form involves these steps:
|
||||
|
||||
1. Analyze the form (run analyze_form.py)
|
||||
2. Create field mapping (edit fields.json)
|
||||
3. Validate mapping (run validate_fields.py)
|
||||
4. Fill the form (run fill_form.py)
|
||||
5. Verify output (run verify_output.py)
|
||||
```
|
||||
|
||||
## Conditional Workflows
|
||||
|
||||
For tasks with branching logic, guide Claude through decision points:
|
||||
|
||||
```markdown
|
||||
1. Determine the modification type:
|
||||
**Creating new content?** → Follow "Creation workflow" below
|
||||
**Editing existing content?** → Follow "Editing workflow" below
|
||||
|
||||
2. Creation workflow: [steps]
|
||||
3. Editing workflow: [steps]
|
||||
```
|
||||
303
skills/skill-creator/scripts/init_skill.py
Executable file
303
skills/skill-creator/scripts/init_skill.py
Executable file
@ -0,0 +1,303 @@
|
||||
#!/usr/bin/env python3
|
||||
"""
|
||||
Skill Initializer - Creates a new skill from template
|
||||
|
||||
Usage:
|
||||
init_skill.py <skill-name> --path <path>
|
||||
|
||||
Examples:
|
||||
init_skill.py my-new-skill --path skills/public
|
||||
init_skill.py my-api-helper --path skills/private
|
||||
init_skill.py custom-skill --path /custom/location
|
||||
"""
|
||||
|
||||
import sys
|
||||
from pathlib import Path
|
||||
|
||||
|
||||
SKILL_TEMPLATE = """---
|
||||
name: {skill_name}
|
||||
description: [TODO: Complete and informative explanation of what the skill does and when to use it. Include WHEN to use this skill - specific scenarios, file types, or tasks that trigger it.]
|
||||
---
|
||||
|
||||
# {skill_title}
|
||||
|
||||
## Overview
|
||||
|
||||
[TODO: 1-2 sentences explaining what this skill enables]
|
||||
|
||||
## Structuring This Skill
|
||||
|
||||
[TODO: Choose the structure that best fits this skill's purpose. Common patterns:
|
||||
|
||||
**1. Workflow-Based** (best for sequential processes)
|
||||
- Works well when there are clear step-by-step procedures
|
||||
- Example: DOCX skill with "Workflow Decision Tree" → "Reading" → "Creating" → "Editing"
|
||||
- Structure: ## Overview → ## Workflow Decision Tree → ## Step 1 → ## Step 2...
|
||||
|
||||
**2. Task-Based** (best for tool collections)
|
||||
- Works well when the skill offers different operations/capabilities
|
||||
- Example: PDF skill with "Quick Start" → "Merge PDFs" → "Split PDFs" → "Extract Text"
|
||||
- Structure: ## Overview → ## Quick Start → ## Task Category 1 → ## Task Category 2...
|
||||
|
||||
**3. Reference/Guidelines** (best for standards or specifications)
|
||||
- Works well for brand guidelines, coding standards, or requirements
|
||||
- Example: Brand styling with "Brand Guidelines" → "Colors" → "Typography" → "Features"
|
||||
- Structure: ## Overview → ## Guidelines → ## Specifications → ## Usage...
|
||||
|
||||
**4. Capabilities-Based** (best for integrated systems)
|
||||
- Works well when the skill provides multiple interrelated features
|
||||
- Example: Product Management with "Core Capabilities" → numbered capability list
|
||||
- Structure: ## Overview → ## Core Capabilities → ### 1. Feature → ### 2. Feature...
|
||||
|
||||
Patterns can be mixed and matched as needed. Most skills combine patterns (e.g., start with task-based, add workflow for complex operations).
|
||||
|
||||
Delete this entire "Structuring This Skill" section when done - it's just guidance.]
|
||||
|
||||
## [TODO: Replace with the first main section based on chosen structure]
|
||||
|
||||
[TODO: Add content here. See examples in existing skills:
|
||||
- Code samples for technical skills
|
||||
- Decision trees for complex workflows
|
||||
- Concrete examples with realistic user requests
|
||||
- References to scripts/templates/references as needed]
|
||||
|
||||
## Resources
|
||||
|
||||
This skill includes example resource directories that demonstrate how to organize different types of bundled resources:
|
||||
|
||||
### scripts/
|
||||
Executable code (Python/Bash/etc.) that can be run directly to perform specific operations.
|
||||
|
||||
**Examples from other skills:**
|
||||
- PDF skill: `fill_fillable_fields.py`, `extract_form_field_info.py` - utilities for PDF manipulation
|
||||
- DOCX skill: `document.py`, `utilities.py` - Python modules for document processing
|
||||
|
||||
**Appropriate for:** Python scripts, shell scripts, or any executable code that performs automation, data processing, or specific operations.
|
||||
|
||||
**Note:** Scripts may be executed without loading into context, but can still be read by Claude for patching or environment adjustments.
|
||||
|
||||
### references/
|
||||
Documentation and reference material intended to be loaded into context to inform Claude's process and thinking.
|
||||
|
||||
**Examples from other skills:**
|
||||
- Product management: `communication.md`, `context_building.md` - detailed workflow guides
|
||||
- BigQuery: API reference documentation and query examples
|
||||
- Finance: Schema documentation, company policies
|
||||
|
||||
**Appropriate for:** In-depth documentation, API references, database schemas, comprehensive guides, or any detailed information that Claude should reference while working.
|
||||
|
||||
### assets/
|
||||
Files not intended to be loaded into context, but rather used within the output Claude produces.
|
||||
|
||||
**Examples from other skills:**
|
||||
- Brand styling: PowerPoint template files (.pptx), logo files
|
||||
- Frontend builder: HTML/React boilerplate project directories
|
||||
- Typography: Font files (.ttf, .woff2)
|
||||
|
||||
**Appropriate for:** Templates, boilerplate code, document templates, images, icons, fonts, or any files meant to be copied or used in the final output.
|
||||
|
||||
---
|
||||
|
||||
**Any unneeded directories can be deleted.** Not every skill requires all three types of resources.
|
||||
"""
|
||||
|
||||
EXAMPLE_SCRIPT = '''#!/usr/bin/env python3
|
||||
"""
|
||||
Example helper script for {skill_name}
|
||||
|
||||
This is a placeholder script that can be executed directly.
|
||||
Replace with actual implementation or delete if not needed.
|
||||
|
||||
Example real scripts from other skills:
|
||||
- pdf/scripts/fill_fillable_fields.py - Fills PDF form fields
|
||||
- pdf/scripts/convert_pdf_to_images.py - Converts PDF pages to images
|
||||
"""
|
||||
|
||||
def main():
|
||||
print("This is an example script for {skill_name}")
|
||||
# TODO: Add actual script logic here
|
||||
# This could be data processing, file conversion, API calls, etc.
|
||||
|
||||
if __name__ == "__main__":
|
||||
main()
|
||||
'''
|
||||
|
||||
EXAMPLE_REFERENCE = """# Reference Documentation for {skill_title}
|
||||
|
||||
This is a placeholder for detailed reference documentation.
|
||||
Replace with actual reference content or delete if not needed.
|
||||
|
||||
Example real reference docs from other skills:
|
||||
- product-management/references/communication.md - Comprehensive guide for status updates
|
||||
- product-management/references/context_building.md - Deep-dive on gathering context
|
||||
- bigquery/references/ - API references and query examples
|
||||
|
||||
## When Reference Docs Are Useful
|
||||
|
||||
Reference docs are ideal for:
|
||||
- Comprehensive API documentation
|
||||
- Detailed workflow guides
|
||||
- Complex multi-step processes
|
||||
- Information too lengthy for main SKILL.md
|
||||
- Content that's only needed for specific use cases
|
||||
|
||||
## Structure Suggestions
|
||||
|
||||
### API Reference Example
|
||||
- Overview
|
||||
- Authentication
|
||||
- Endpoints with examples
|
||||
- Error codes
|
||||
- Rate limits
|
||||
|
||||
### Workflow Guide Example
|
||||
- Prerequisites
|
||||
- Step-by-step instructions
|
||||
- Common patterns
|
||||
- Troubleshooting
|
||||
- Best practices
|
||||
"""
|
||||
|
||||
EXAMPLE_ASSET = """# Example Asset File
|
||||
|
||||
This placeholder represents where asset files would be stored.
|
||||
Replace with actual asset files (templates, images, fonts, etc.) or delete if not needed.
|
||||
|
||||
Asset files are NOT intended to be loaded into context, but rather used within
|
||||
the output Claude produces.
|
||||
|
||||
Example asset files from other skills:
|
||||
- Brand guidelines: logo.png, slides_template.pptx
|
||||
- Frontend builder: hello-world/ directory with HTML/React boilerplate
|
||||
- Typography: custom-font.ttf, font-family.woff2
|
||||
- Data: sample_data.csv, test_dataset.json
|
||||
|
||||
## Common Asset Types
|
||||
|
||||
- Templates: .pptx, .docx, boilerplate directories
|
||||
- Images: .png, .jpg, .svg, .gif
|
||||
- Fonts: .ttf, .otf, .woff, .woff2
|
||||
- Boilerplate code: Project directories, starter files
|
||||
- Icons: .ico, .svg
|
||||
- Data files: .csv, .json, .xml, .yaml
|
||||
|
||||
Note: This is a text placeholder. Actual assets can be any file type.
|
||||
"""
|
||||
|
||||
|
||||
def title_case_skill_name(skill_name):
|
||||
"""Convert hyphenated skill name to Title Case for display."""
|
||||
return ' '.join(word.capitalize() for word in skill_name.split('-'))
|
||||
|
||||
|
||||
def init_skill(skill_name, path):
|
||||
"""
|
||||
Initialize a new skill directory with template SKILL.md.
|
||||
|
||||
Args:
|
||||
skill_name: Name of the skill
|
||||
path: Path where the skill directory should be created
|
||||
|
||||
Returns:
|
||||
Path to created skill directory, or None if error
|
||||
"""
|
||||
# Determine skill directory path
|
||||
skill_dir = Path(path).resolve() / skill_name
|
||||
|
||||
# Check if directory already exists
|
||||
if skill_dir.exists():
|
||||
print(f"❌ Error: Skill directory already exists: {skill_dir}")
|
||||
return None
|
||||
|
||||
# Create skill directory
|
||||
try:
|
||||
skill_dir.mkdir(parents=True, exist_ok=False)
|
||||
print(f"✅ Created skill directory: {skill_dir}")
|
||||
except Exception as e:
|
||||
print(f"❌ Error creating directory: {e}")
|
||||
return None
|
||||
|
||||
# Create SKILL.md from template
|
||||
skill_title = title_case_skill_name(skill_name)
|
||||
skill_content = SKILL_TEMPLATE.format(
|
||||
skill_name=skill_name,
|
||||
skill_title=skill_title
|
||||
)
|
||||
|
||||
skill_md_path = skill_dir / 'SKILL.md'
|
||||
try:
|
||||
skill_md_path.write_text(skill_content)
|
||||
print("✅ Created SKILL.md")
|
||||
except Exception as e:
|
||||
print(f"❌ Error creating SKILL.md: {e}")
|
||||
return None
|
||||
|
||||
# Create resource directories with example files
|
||||
try:
|
||||
# Create scripts/ directory with example script
|
||||
scripts_dir = skill_dir / 'scripts'
|
||||
scripts_dir.mkdir(exist_ok=True)
|
||||
example_script = scripts_dir / 'example.py'
|
||||
example_script.write_text(EXAMPLE_SCRIPT.format(skill_name=skill_name))
|
||||
example_script.chmod(0o755)
|
||||
print("✅ Created scripts/example.py")
|
||||
|
||||
# Create references/ directory with example reference doc
|
||||
references_dir = skill_dir / 'references'
|
||||
references_dir.mkdir(exist_ok=True)
|
||||
example_reference = references_dir / 'api_reference.md'
|
||||
example_reference.write_text(EXAMPLE_REFERENCE.format(skill_title=skill_title))
|
||||
print("✅ Created references/api_reference.md")
|
||||
|
||||
# Create assets/ directory with example asset placeholder
|
||||
assets_dir = skill_dir / 'assets'
|
||||
assets_dir.mkdir(exist_ok=True)
|
||||
example_asset = assets_dir / 'example_asset.txt'
|
||||
example_asset.write_text(EXAMPLE_ASSET)
|
||||
print("✅ Created assets/example_asset.txt")
|
||||
except Exception as e:
|
||||
print(f"❌ Error creating resource directories: {e}")
|
||||
return None
|
||||
|
||||
# Print next steps
|
||||
print(f"\n✅ Skill '{skill_name}' initialized successfully at {skill_dir}")
|
||||
print("\nNext steps:")
|
||||
print("1. Edit SKILL.md to complete the TODO items and update the description")
|
||||
print("2. Customize or delete the example files in scripts/, references/, and assets/")
|
||||
print("3. Run the validator when ready to check the skill structure")
|
||||
|
||||
return skill_dir
|
||||
|
||||
|
||||
def main():
|
||||
if len(sys.argv) < 4 or sys.argv[2] != '--path':
|
||||
print("Usage: init_skill.py <skill-name> --path <path>")
|
||||
print("\nSkill name requirements:")
|
||||
print(" - Hyphen-case identifier (e.g., 'data-analyzer')")
|
||||
print(" - Lowercase letters, digits, and hyphens only")
|
||||
print(" - Max 40 characters")
|
||||
print(" - Must match directory name exactly")
|
||||
print("\nExamples:")
|
||||
print(" init_skill.py my-new-skill --path skills/public")
|
||||
print(" init_skill.py my-api-helper --path skills/private")
|
||||
print(" init_skill.py custom-skill --path /custom/location")
|
||||
sys.exit(1)
|
||||
|
||||
skill_name = sys.argv[1]
|
||||
path = sys.argv[3]
|
||||
|
||||
print(f"🚀 Initializing skill: {skill_name}")
|
||||
print(f" Location: {path}")
|
||||
print()
|
||||
|
||||
result = init_skill(skill_name, path)
|
||||
|
||||
if result:
|
||||
sys.exit(0)
|
||||
else:
|
||||
sys.exit(1)
|
||||
|
||||
|
||||
if __name__ == "__main__":
|
||||
main()
|
||||
110
skills/skill-creator/scripts/package_skill.py
Executable file
110
skills/skill-creator/scripts/package_skill.py
Executable file
@ -0,0 +1,110 @@
|
||||
#!/usr/bin/env python3
|
||||
"""
|
||||
Skill Packager - Creates a distributable .skill file of a skill folder
|
||||
|
||||
Usage:
|
||||
python utils/package_skill.py <path/to/skill-folder> [output-directory]
|
||||
|
||||
Example:
|
||||
python utils/package_skill.py skills/public/my-skill
|
||||
python utils/package_skill.py skills/public/my-skill ./dist
|
||||
"""
|
||||
|
||||
import sys
|
||||
import zipfile
|
||||
from pathlib import Path
|
||||
from quick_validate import validate_skill
|
||||
|
||||
|
||||
def package_skill(skill_path, output_dir=None):
|
||||
"""
|
||||
Package a skill folder into a .skill file.
|
||||
|
||||
Args:
|
||||
skill_path: Path to the skill folder
|
||||
output_dir: Optional output directory for the .skill file (defaults to current directory)
|
||||
|
||||
Returns:
|
||||
Path to the created .skill file, or None if error
|
||||
"""
|
||||
skill_path = Path(skill_path).resolve()
|
||||
|
||||
# Validate skill folder exists
|
||||
if not skill_path.exists():
|
||||
print(f"❌ Error: Skill folder not found: {skill_path}")
|
||||
return None
|
||||
|
||||
if not skill_path.is_dir():
|
||||
print(f"❌ Error: Path is not a directory: {skill_path}")
|
||||
return None
|
||||
|
||||
# Validate SKILL.md exists
|
||||
skill_md = skill_path / "SKILL.md"
|
||||
if not skill_md.exists():
|
||||
print(f"❌ Error: SKILL.md not found in {skill_path}")
|
||||
return None
|
||||
|
||||
# Run validation before packaging
|
||||
print("🔍 Validating skill...")
|
||||
valid, message = validate_skill(skill_path)
|
||||
if not valid:
|
||||
print(f"❌ Validation failed: {message}")
|
||||
print(" Please fix the validation errors before packaging.")
|
||||
return None
|
||||
print(f"✅ {message}\n")
|
||||
|
||||
# Determine output location
|
||||
skill_name = skill_path.name
|
||||
if output_dir:
|
||||
output_path = Path(output_dir).resolve()
|
||||
output_path.mkdir(parents=True, exist_ok=True)
|
||||
else:
|
||||
output_path = Path.cwd()
|
||||
|
||||
skill_filename = output_path / f"{skill_name}.skill"
|
||||
|
||||
# Create the .skill file (zip format)
|
||||
try:
|
||||
with zipfile.ZipFile(skill_filename, 'w', zipfile.ZIP_DEFLATED) as zipf:
|
||||
# Walk through the skill directory
|
||||
for file_path in skill_path.rglob('*'):
|
||||
if file_path.is_file():
|
||||
# Calculate the relative path within the zip
|
||||
arcname = file_path.relative_to(skill_path.parent)
|
||||
zipf.write(file_path, arcname)
|
||||
print(f" Added: {arcname}")
|
||||
|
||||
print(f"\n✅ Successfully packaged skill to: {skill_filename}")
|
||||
return skill_filename
|
||||
|
||||
except Exception as e:
|
||||
print(f"❌ Error creating .skill file: {e}")
|
||||
return None
|
||||
|
||||
|
||||
def main():
|
||||
if len(sys.argv) < 2:
|
||||
print("Usage: python utils/package_skill.py <path/to/skill-folder> [output-directory]")
|
||||
print("\nExample:")
|
||||
print(" python utils/package_skill.py skills/public/my-skill")
|
||||
print(" python utils/package_skill.py skills/public/my-skill ./dist")
|
||||
sys.exit(1)
|
||||
|
||||
skill_path = sys.argv[1]
|
||||
output_dir = sys.argv[2] if len(sys.argv) > 2 else None
|
||||
|
||||
print(f"📦 Packaging skill: {skill_path}")
|
||||
if output_dir:
|
||||
print(f" Output directory: {output_dir}")
|
||||
print()
|
||||
|
||||
result = package_skill(skill_path, output_dir)
|
||||
|
||||
if result:
|
||||
sys.exit(0)
|
||||
else:
|
||||
sys.exit(1)
|
||||
|
||||
|
||||
if __name__ == "__main__":
|
||||
main()
|
||||
95
skills/skill-creator/scripts/quick_validate.py
Executable file
95
skills/skill-creator/scripts/quick_validate.py
Executable file
@ -0,0 +1,95 @@
|
||||
#!/usr/bin/env python3
|
||||
"""
|
||||
Quick validation script for skills - minimal version
|
||||
"""
|
||||
|
||||
import sys
|
||||
import os
|
||||
import re
|
||||
import yaml
|
||||
from pathlib import Path
|
||||
|
||||
def validate_skill(skill_path):
|
||||
"""Basic validation of a skill"""
|
||||
skill_path = Path(skill_path)
|
||||
|
||||
# Check SKILL.md exists
|
||||
skill_md = skill_path / 'SKILL.md'
|
||||
if not skill_md.exists():
|
||||
return False, "SKILL.md not found"
|
||||
|
||||
# Read and validate frontmatter
|
||||
content = skill_md.read_text()
|
||||
if not content.startswith('---'):
|
||||
return False, "No YAML frontmatter found"
|
||||
|
||||
# Extract frontmatter
|
||||
match = re.match(r'^---\n(.*?)\n---', content, re.DOTALL)
|
||||
if not match:
|
||||
return False, "Invalid frontmatter format"
|
||||
|
||||
frontmatter_text = match.group(1)
|
||||
|
||||
# Parse YAML frontmatter
|
||||
try:
|
||||
frontmatter = yaml.safe_load(frontmatter_text)
|
||||
if not isinstance(frontmatter, dict):
|
||||
return False, "Frontmatter must be a YAML dictionary"
|
||||
except yaml.YAMLError as e:
|
||||
return False, f"Invalid YAML in frontmatter: {e}"
|
||||
|
||||
# Define allowed properties
|
||||
ALLOWED_PROPERTIES = {'name', 'description', 'license', 'allowed-tools', 'metadata'}
|
||||
|
||||
# Check for unexpected properties (excluding nested keys under metadata)
|
||||
unexpected_keys = set(frontmatter.keys()) - ALLOWED_PROPERTIES
|
||||
if unexpected_keys:
|
||||
return False, (
|
||||
f"Unexpected key(s) in SKILL.md frontmatter: {', '.join(sorted(unexpected_keys))}. "
|
||||
f"Allowed properties are: {', '.join(sorted(ALLOWED_PROPERTIES))}"
|
||||
)
|
||||
|
||||
# Check required fields
|
||||
if 'name' not in frontmatter:
|
||||
return False, "Missing 'name' in frontmatter"
|
||||
if 'description' not in frontmatter:
|
||||
return False, "Missing 'description' in frontmatter"
|
||||
|
||||
# Extract name for validation
|
||||
name = frontmatter.get('name', '')
|
||||
if not isinstance(name, str):
|
||||
return False, f"Name must be a string, got {type(name).__name__}"
|
||||
name = name.strip()
|
||||
if name:
|
||||
# Check naming convention (hyphen-case: lowercase with hyphens)
|
||||
if not re.match(r'^[a-z0-9-]+$', name):
|
||||
return False, f"Name '{name}' should be hyphen-case (lowercase letters, digits, and hyphens only)"
|
||||
if name.startswith('-') or name.endswith('-') or '--' in name:
|
||||
return False, f"Name '{name}' cannot start/end with hyphen or contain consecutive hyphens"
|
||||
# Check name length (max 64 characters per spec)
|
||||
if len(name) > 64:
|
||||
return False, f"Name is too long ({len(name)} characters). Maximum is 64 characters."
|
||||
|
||||
# Extract and validate description
|
||||
description = frontmatter.get('description', '')
|
||||
if not isinstance(description, str):
|
||||
return False, f"Description must be a string, got {type(description).__name__}"
|
||||
description = description.strip()
|
||||
if description:
|
||||
# Check for angle brackets
|
||||
if '<' in description or '>' in description:
|
||||
return False, "Description cannot contain angle brackets (< or >)"
|
||||
# Check description length (max 1024 characters per spec)
|
||||
if len(description) > 1024:
|
||||
return False, f"Description is too long ({len(description)} characters). Maximum is 1024 characters."
|
||||
|
||||
return True, "Skill is valid!"
|
||||
|
||||
if __name__ == "__main__":
|
||||
if len(sys.argv) != 2:
|
||||
print("Usage: python quick_validate.py <skill_directory>")
|
||||
sys.exit(1)
|
||||
|
||||
valid, message = validate_skill(sys.argv[1])
|
||||
print(message)
|
||||
sys.exit(0 if valid else 1)
|
||||
56
skills/skills-installer/SKILL.md
Normal file
56
skills/skills-installer/SKILL.md
Normal file
@ -0,0 +1,56 @@
|
||||
---
|
||||
name: skills-installer
|
||||
description: Install skills from skills.sh globally using the npx skills CLI. Use when user asks to "install a skill", "add a skill globally", "find skills for X", "browse skills.sh", or wants to discover and install agent skills from the skills.sh directory.
|
||||
---
|
||||
|
||||
# Skills Installer
|
||||
|
||||
Install agent skills from skills.sh to extend Claude's capabilities.
|
||||
|
||||
## Installation Commands
|
||||
|
||||
```bash
|
||||
# List available skills in a repo
|
||||
npx skills add <owner/repo> --list
|
||||
|
||||
# Install specific skill to project
|
||||
npx skills add <owner/repo> --skill <skill-name> --agent claude-code --yes
|
||||
|
||||
# Install specific skill globally
|
||||
npx skills add <owner/repo> --skill <skill-name> --agent claude-code --global --yes
|
||||
|
||||
# Install all skills from repo globally
|
||||
npx skills add <owner/repo> --agent claude-code --global --all
|
||||
```
|
||||
|
||||
## Popular Skill Repositories
|
||||
|
||||
| Repository | Skills | Use Case |
|
||||
|------------|--------|----------|
|
||||
| cloudflare/skills | wrangler, web-perf, agents-sdk, durable-objects | Cloudflare Workers, performance |
|
||||
| vercel-labs/agent-skills | vercel-react-best-practices, web-design-guidelines | React/Next.js, web design |
|
||||
| anthropics/skills | frontend-design, skill-creator | UI design, skill creation |
|
||||
| expo/skills | building-native-ui | React Native, mobile |
|
||||
| better-auth/skills | better-auth-best-practices | Authentication |
|
||||
| remotion-dev/skills | remotion-best-practices | Video creation |
|
||||
| stripe/ai | stripe-ai | Payment integrations |
|
||||
|
||||
## Workflow
|
||||
|
||||
1. Browse https://skills.sh/ for available skills
|
||||
2. List skills in a repo: `npx skills add <owner/repo> --list`
|
||||
3. Install globally: `npx skills add <owner/repo> --skill <name> --agent claude-code --global --yes`
|
||||
|
||||
## CLI Options
|
||||
|
||||
- `--list` - List available skills without installing
|
||||
- `--skill <name>` - Install specific skill(s)
|
||||
- `--agent <agent>` - Target agent (claude-code, opencode, cursor, codex, etc.)
|
||||
- `--global` - Install to user level (~/.agents/skills/)
|
||||
- `--yes` - Skip confirmation prompts
|
||||
- `--all` - Install all skills to all agents
|
||||
|
||||
## Installation Locations
|
||||
|
||||
- **Project-level**: `./.agents/skills/<skill-name>/` with symlink to `./.claude/skills/`
|
||||
- **Global**: `~/.agents/skills/<skill-name>/` with symlink to `~/.claude/skills/`
|
||||
2719
skills/vercel-react-best-practices/AGENTS.md
Normal file
2719
skills/vercel-react-best-practices/AGENTS.md
Normal file
File diff suppressed because it is too large
Load Diff
125
skills/vercel-react-best-practices/SKILL.md
Normal file
125
skills/vercel-react-best-practices/SKILL.md
Normal file
@ -0,0 +1,125 @@
|
||||
---
|
||||
name: vercel-react-best-practices
|
||||
description: React and Next.js performance optimization guidelines from Vercel Engineering. This skill should be used when writing, reviewing, or refactoring React/Next.js code to ensure optimal performance patterns. Triggers on tasks involving React components, Next.js pages, data fetching, bundle optimization, or performance improvements.
|
||||
license: MIT
|
||||
metadata:
|
||||
author: vercel
|
||||
version: "1.0.0"
|
||||
---
|
||||
|
||||
# Vercel React Best Practices
|
||||
|
||||
Comprehensive performance optimization guide for React and Next.js applications, maintained by Vercel. Contains 45 rules across 8 categories, prioritized by impact to guide automated refactoring and code generation.
|
||||
|
||||
## When to Apply
|
||||
|
||||
Reference these guidelines when:
|
||||
- Writing new React components or Next.js pages
|
||||
- Implementing data fetching (client or server-side)
|
||||
- Reviewing code for performance issues
|
||||
- Refactoring existing React/Next.js code
|
||||
- Optimizing bundle size or load times
|
||||
|
||||
## Rule Categories by Priority
|
||||
|
||||
| Priority | Category | Impact | Prefix |
|
||||
|----------|----------|--------|--------|
|
||||
| 1 | Eliminating Waterfalls | CRITICAL | `async-` |
|
||||
| 2 | Bundle Size Optimization | CRITICAL | `bundle-` |
|
||||
| 3 | Server-Side Performance | HIGH | `server-` |
|
||||
| 4 | Client-Side Data Fetching | MEDIUM-HIGH | `client-` |
|
||||
| 5 | Re-render Optimization | MEDIUM | `rerender-` |
|
||||
| 6 | Rendering Performance | MEDIUM | `rendering-` |
|
||||
| 7 | JavaScript Performance | LOW-MEDIUM | `js-` |
|
||||
| 8 | Advanced Patterns | LOW | `advanced-` |
|
||||
|
||||
## Quick Reference
|
||||
|
||||
### 1. Eliminating Waterfalls (CRITICAL)
|
||||
|
||||
- `async-defer-await` - Move await into branches where actually used
|
||||
- `async-parallel` - Use Promise.all() for independent operations
|
||||
- `async-dependencies` - Use better-all for partial dependencies
|
||||
- `async-api-routes` - Start promises early, await late in API routes
|
||||
- `async-suspense-boundaries` - Use Suspense to stream content
|
||||
|
||||
### 2. Bundle Size Optimization (CRITICAL)
|
||||
|
||||
- `bundle-barrel-imports` - Import directly, avoid barrel files
|
||||
- `bundle-dynamic-imports` - Use next/dynamic for heavy components
|
||||
- `bundle-defer-third-party` - Load analytics/logging after hydration
|
||||
- `bundle-conditional` - Load modules only when feature is activated
|
||||
- `bundle-preload` - Preload on hover/focus for perceived speed
|
||||
|
||||
### 3. Server-Side Performance (HIGH)
|
||||
|
||||
- `server-cache-react` - Use React.cache() for per-request deduplication
|
||||
- `server-cache-lru` - Use LRU cache for cross-request caching
|
||||
- `server-serialization` - Minimize data passed to client components
|
||||
- `server-parallel-fetching` - Restructure components to parallelize fetches
|
||||
- `server-after-nonblocking` - Use after() for non-blocking operations
|
||||
|
||||
### 4. Client-Side Data Fetching (MEDIUM-HIGH)
|
||||
|
||||
- `client-swr-dedup` - Use SWR for automatic request deduplication
|
||||
- `client-event-listeners` - Deduplicate global event listeners
|
||||
|
||||
### 5. Re-render Optimization (MEDIUM)
|
||||
|
||||
- `rerender-defer-reads` - Don't subscribe to state only used in callbacks
|
||||
- `rerender-memo` - Extract expensive work into memoized components
|
||||
- `rerender-dependencies` - Use primitive dependencies in effects
|
||||
- `rerender-derived-state` - Subscribe to derived booleans, not raw values
|
||||
- `rerender-functional-setstate` - Use functional setState for stable callbacks
|
||||
- `rerender-lazy-state-init` - Pass function to useState for expensive values
|
||||
- `rerender-transitions` - Use startTransition for non-urgent updates
|
||||
|
||||
### 6. Rendering Performance (MEDIUM)
|
||||
|
||||
- `rendering-animate-svg-wrapper` - Animate div wrapper, not SVG element
|
||||
- `rendering-content-visibility` - Use content-visibility for long lists
|
||||
- `rendering-hoist-jsx` - Extract static JSX outside components
|
||||
- `rendering-svg-precision` - Reduce SVG coordinate precision
|
||||
- `rendering-hydration-no-flicker` - Use inline script for client-only data
|
||||
- `rendering-activity` - Use Activity component for show/hide
|
||||
- `rendering-conditional-render` - Use ternary, not && for conditionals
|
||||
|
||||
### 7. JavaScript Performance (LOW-MEDIUM)
|
||||
|
||||
- `js-batch-dom-css` - Group CSS changes via classes or cssText
|
||||
- `js-index-maps` - Build Map for repeated lookups
|
||||
- `js-cache-property-access` - Cache object properties in loops
|
||||
- `js-cache-function-results` - Cache function results in module-level Map
|
||||
- `js-cache-storage` - Cache localStorage/sessionStorage reads
|
||||
- `js-combine-iterations` - Combine multiple filter/map into one loop
|
||||
- `js-length-check-first` - Check array length before expensive comparison
|
||||
- `js-early-exit` - Return early from functions
|
||||
- `js-hoist-regexp` - Hoist RegExp creation outside loops
|
||||
- `js-min-max-loop` - Use loop for min/max instead of sort
|
||||
- `js-set-map-lookups` - Use Set/Map for O(1) lookups
|
||||
- `js-tosorted-immutable` - Use toSorted() for immutability
|
||||
|
||||
### 8. Advanced Patterns (LOW)
|
||||
|
||||
- `advanced-event-handler-refs` - Store event handlers in refs
|
||||
- `advanced-use-latest` - useLatest for stable callback refs
|
||||
|
||||
## How to Use
|
||||
|
||||
Read individual rule files for detailed explanations and code examples:
|
||||
|
||||
```
|
||||
rules/async-parallel.md
|
||||
rules/bundle-barrel-imports.md
|
||||
rules/_sections.md
|
||||
```
|
||||
|
||||
Each rule file contains:
|
||||
- Brief explanation of why it matters
|
||||
- Incorrect code example with explanation
|
||||
- Correct code example with explanation
|
||||
- Additional context and references
|
||||
|
||||
## Full Compiled Document
|
||||
|
||||
For the complete guide with all rules expanded: `AGENTS.md`
|
||||
@ -0,0 +1,55 @@
|
||||
---
|
||||
title: Store Event Handlers in Refs
|
||||
impact: LOW
|
||||
impactDescription: stable subscriptions
|
||||
tags: advanced, hooks, refs, event-handlers, optimization
|
||||
---
|
||||
|
||||
## Store Event Handlers in Refs
|
||||
|
||||
Store callbacks in refs when used in effects that shouldn't re-subscribe on callback changes.
|
||||
|
||||
**Incorrect (re-subscribes on every render):**
|
||||
|
||||
```tsx
|
||||
function useWindowEvent(event: string, handler: (e) => void) {
|
||||
useEffect(() => {
|
||||
window.addEventListener(event, handler)
|
||||
return () => window.removeEventListener(event, handler)
|
||||
}, [event, handler])
|
||||
}
|
||||
```
|
||||
|
||||
**Correct (stable subscription):**
|
||||
|
||||
```tsx
|
||||
function useWindowEvent(event: string, handler: (e) => void) {
|
||||
const handlerRef = useRef(handler)
|
||||
useEffect(() => {
|
||||
handlerRef.current = handler
|
||||
}, [handler])
|
||||
|
||||
useEffect(() => {
|
||||
const listener = (e) => handlerRef.current(e)
|
||||
window.addEventListener(event, listener)
|
||||
return () => window.removeEventListener(event, listener)
|
||||
}, [event])
|
||||
}
|
||||
```
|
||||
|
||||
**Alternative: use `useEffectEvent` if you're on latest React:**
|
||||
|
||||
```tsx
|
||||
import { useEffectEvent } from 'react'
|
||||
|
||||
function useWindowEvent(event: string, handler: (e) => void) {
|
||||
const onEvent = useEffectEvent(handler)
|
||||
|
||||
useEffect(() => {
|
||||
window.addEventListener(event, onEvent)
|
||||
return () => window.removeEventListener(event, onEvent)
|
||||
}, [event])
|
||||
}
|
||||
```
|
||||
|
||||
`useEffectEvent` provides a cleaner API for the same pattern: it creates a stable function reference that always calls the latest version of the handler.
|
||||
@ -0,0 +1,39 @@
|
||||
---
|
||||
title: useEffectEvent for Stable Callback Refs
|
||||
impact: LOW
|
||||
impactDescription: prevents effect re-runs
|
||||
tags: advanced, hooks, useEffectEvent, refs, optimization
|
||||
---
|
||||
|
||||
## useEffectEvent for Stable Callback Refs
|
||||
|
||||
Access latest values in callbacks without adding them to dependency arrays. Prevents effect re-runs while avoiding stale closures.
|
||||
|
||||
**Incorrect (effect re-runs on every callback change):**
|
||||
|
||||
```tsx
|
||||
function SearchInput({ onSearch }: { onSearch: (q: string) => void }) {
|
||||
const [query, setQuery] = useState('')
|
||||
|
||||
useEffect(() => {
|
||||
const timeout = setTimeout(() => onSearch(query), 300)
|
||||
return () => clearTimeout(timeout)
|
||||
}, [query, onSearch])
|
||||
}
|
||||
```
|
||||
|
||||
**Correct (using React's useEffectEvent):**
|
||||
|
||||
```tsx
|
||||
import { useEffectEvent } from 'react';
|
||||
|
||||
function SearchInput({ onSearch }: { onSearch: (q: string) => void }) {
|
||||
const [query, setQuery] = useState('')
|
||||
const onSearchEvent = useEffectEvent(onSearch)
|
||||
|
||||
useEffect(() => {
|
||||
const timeout = setTimeout(() => onSearchEvent(query), 300)
|
||||
return () => clearTimeout(timeout)
|
||||
}, [query])
|
||||
}
|
||||
```
|
||||
38
skills/vercel-react-best-practices/rules/async-api-routes.md
Normal file
38
skills/vercel-react-best-practices/rules/async-api-routes.md
Normal file
@ -0,0 +1,38 @@
|
||||
---
|
||||
title: Prevent Waterfall Chains in API Routes
|
||||
impact: CRITICAL
|
||||
impactDescription: 2-10× improvement
|
||||
tags: api-routes, server-actions, waterfalls, parallelization
|
||||
---
|
||||
|
||||
## Prevent Waterfall Chains in API Routes
|
||||
|
||||
In API routes and Server Actions, start independent operations immediately, even if you don't await them yet.
|
||||
|
||||
**Incorrect (config waits for auth, data waits for both):**
|
||||
|
||||
```typescript
|
||||
export async function GET(request: Request) {
|
||||
const session = await auth()
|
||||
const config = await fetchConfig()
|
||||
const data = await fetchData(session.user.id)
|
||||
return Response.json({ data, config })
|
||||
}
|
||||
```
|
||||
|
||||
**Correct (auth and config start immediately):**
|
||||
|
||||
```typescript
|
||||
export async function GET(request: Request) {
|
||||
const sessionPromise = auth()
|
||||
const configPromise = fetchConfig()
|
||||
const session = await sessionPromise
|
||||
const [config, data] = await Promise.all([
|
||||
configPromise,
|
||||
fetchData(session.user.id)
|
||||
])
|
||||
return Response.json({ data, config })
|
||||
}
|
||||
```
|
||||
|
||||
For operations with more complex dependency chains, use `better-all` to automatically maximize parallelism (see Dependency-Based Parallelization).
|
||||
@ -0,0 +1,80 @@
|
||||
---
|
||||
title: Defer Await Until Needed
|
||||
impact: HIGH
|
||||
impactDescription: avoids blocking unused code paths
|
||||
tags: async, await, conditional, optimization
|
||||
---
|
||||
|
||||
## Defer Await Until Needed
|
||||
|
||||
Move `await` operations into the branches where they're actually used to avoid blocking code paths that don't need them.
|
||||
|
||||
**Incorrect (blocks both branches):**
|
||||
|
||||
```typescript
|
||||
async function handleRequest(userId: string, skipProcessing: boolean) {
|
||||
const userData = await fetchUserData(userId)
|
||||
|
||||
if (skipProcessing) {
|
||||
// Returns immediately but still waited for userData
|
||||
return { skipped: true }
|
||||
}
|
||||
|
||||
// Only this branch uses userData
|
||||
return processUserData(userData)
|
||||
}
|
||||
```
|
||||
|
||||
**Correct (only blocks when needed):**
|
||||
|
||||
```typescript
|
||||
async function handleRequest(userId: string, skipProcessing: boolean) {
|
||||
if (skipProcessing) {
|
||||
// Returns immediately without waiting
|
||||
return { skipped: true }
|
||||
}
|
||||
|
||||
// Fetch only when needed
|
||||
const userData = await fetchUserData(userId)
|
||||
return processUserData(userData)
|
||||
}
|
||||
```
|
||||
|
||||
**Another example (early return optimization):**
|
||||
|
||||
```typescript
|
||||
// Incorrect: always fetches permissions
|
||||
async function updateResource(resourceId: string, userId: string) {
|
||||
const permissions = await fetchPermissions(userId)
|
||||
const resource = await getResource(resourceId)
|
||||
|
||||
if (!resource) {
|
||||
return { error: 'Not found' }
|
||||
}
|
||||
|
||||
if (!permissions.canEdit) {
|
||||
return { error: 'Forbidden' }
|
||||
}
|
||||
|
||||
return await updateResourceData(resource, permissions)
|
||||
}
|
||||
|
||||
// Correct: fetches only when needed
|
||||
async function updateResource(resourceId: string, userId: string) {
|
||||
const resource = await getResource(resourceId)
|
||||
|
||||
if (!resource) {
|
||||
return { error: 'Not found' }
|
||||
}
|
||||
|
||||
const permissions = await fetchPermissions(userId)
|
||||
|
||||
if (!permissions.canEdit) {
|
||||
return { error: 'Forbidden' }
|
||||
}
|
||||
|
||||
return await updateResourceData(resource, permissions)
|
||||
}
|
||||
```
|
||||
|
||||
This optimization is especially valuable when the skipped branch is frequently taken, or when the deferred operation is expensive.
|
||||
@ -0,0 +1,51 @@
|
||||
---
|
||||
title: Dependency-Based Parallelization
|
||||
impact: CRITICAL
|
||||
impactDescription: 2-10× improvement
|
||||
tags: async, parallelization, dependencies, better-all
|
||||
---
|
||||
|
||||
## Dependency-Based Parallelization
|
||||
|
||||
For operations with partial dependencies, use `better-all` to maximize parallelism. It automatically starts each task at the earliest possible moment.
|
||||
|
||||
**Incorrect (profile waits for config unnecessarily):**
|
||||
|
||||
```typescript
|
||||
const [user, config] = await Promise.all([
|
||||
fetchUser(),
|
||||
fetchConfig()
|
||||
])
|
||||
const profile = await fetchProfile(user.id)
|
||||
```
|
||||
|
||||
**Correct (config and profile run in parallel):**
|
||||
|
||||
```typescript
|
||||
import { all } from 'better-all'
|
||||
|
||||
const { user, config, profile } = await all({
|
||||
async user() { return fetchUser() },
|
||||
async config() { return fetchConfig() },
|
||||
async profile() {
|
||||
return fetchProfile((await this.$.user).id)
|
||||
}
|
||||
})
|
||||
```
|
||||
|
||||
**Alternative without extra dependencies:**
|
||||
|
||||
We can also create all the promises first, and do `Promise.all()` at the end.
|
||||
|
||||
```typescript
|
||||
const userPromise = fetchUser()
|
||||
const profilePromise = userPromise.then(user => fetchProfile(user.id))
|
||||
|
||||
const [user, config, profile] = await Promise.all([
|
||||
userPromise,
|
||||
fetchConfig(),
|
||||
profilePromise
|
||||
])
|
||||
```
|
||||
|
||||
Reference: [https://github.com/shuding/better-all](https://github.com/shuding/better-all)
|
||||
28
skills/vercel-react-best-practices/rules/async-parallel.md
Normal file
28
skills/vercel-react-best-practices/rules/async-parallel.md
Normal file
@ -0,0 +1,28 @@
|
||||
---
|
||||
title: Promise.all() for Independent Operations
|
||||
impact: CRITICAL
|
||||
impactDescription: 2-10× improvement
|
||||
tags: async, parallelization, promises, waterfalls
|
||||
---
|
||||
|
||||
## Promise.all() for Independent Operations
|
||||
|
||||
When async operations have no interdependencies, execute them concurrently using `Promise.all()`.
|
||||
|
||||
**Incorrect (sequential execution, 3 round trips):**
|
||||
|
||||
```typescript
|
||||
const user = await fetchUser()
|
||||
const posts = await fetchPosts()
|
||||
const comments = await fetchComments()
|
||||
```
|
||||
|
||||
**Correct (parallel execution, 1 round trip):**
|
||||
|
||||
```typescript
|
||||
const [user, posts, comments] = await Promise.all([
|
||||
fetchUser(),
|
||||
fetchPosts(),
|
||||
fetchComments()
|
||||
])
|
||||
```
|
||||
@ -0,0 +1,99 @@
|
||||
---
|
||||
title: Strategic Suspense Boundaries
|
||||
impact: HIGH
|
||||
impactDescription: faster initial paint
|
||||
tags: async, suspense, streaming, layout-shift
|
||||
---
|
||||
|
||||
## Strategic Suspense Boundaries
|
||||
|
||||
Instead of awaiting data in async components before returning JSX, use Suspense boundaries to show the wrapper UI faster while data loads.
|
||||
|
||||
**Incorrect (wrapper blocked by data fetching):**
|
||||
|
||||
```tsx
|
||||
async function Page() {
|
||||
const data = await fetchData() // Blocks entire page
|
||||
|
||||
return (
|
||||
<div>
|
||||
<div>Sidebar</div>
|
||||
<div>Header</div>
|
||||
<div>
|
||||
<DataDisplay data={data} />
|
||||
</div>
|
||||
<div>Footer</div>
|
||||
</div>
|
||||
)
|
||||
}
|
||||
```
|
||||
|
||||
The entire layout waits for data even though only the middle section needs it.
|
||||
|
||||
**Correct (wrapper shows immediately, data streams in):**
|
||||
|
||||
```tsx
|
||||
function Page() {
|
||||
return (
|
||||
<div>
|
||||
<div>Sidebar</div>
|
||||
<div>Header</div>
|
||||
<div>
|
||||
<Suspense fallback={<Skeleton />}>
|
||||
<DataDisplay />
|
||||
</Suspense>
|
||||
</div>
|
||||
<div>Footer</div>
|
||||
</div>
|
||||
)
|
||||
}
|
||||
|
||||
async function DataDisplay() {
|
||||
const data = await fetchData() // Only blocks this component
|
||||
return <div>{data.content}</div>
|
||||
}
|
||||
```
|
||||
|
||||
Sidebar, Header, and Footer render immediately. Only DataDisplay waits for data.
|
||||
|
||||
**Alternative (share promise across components):**
|
||||
|
||||
```tsx
|
||||
function Page() {
|
||||
// Start fetch immediately, but don't await
|
||||
const dataPromise = fetchData()
|
||||
|
||||
return (
|
||||
<div>
|
||||
<div>Sidebar</div>
|
||||
<div>Header</div>
|
||||
<Suspense fallback={<Skeleton />}>
|
||||
<DataDisplay dataPromise={dataPromise} />
|
||||
<DataSummary dataPromise={dataPromise} />
|
||||
</Suspense>
|
||||
<div>Footer</div>
|
||||
</div>
|
||||
)
|
||||
}
|
||||
|
||||
function DataDisplay({ dataPromise }: { dataPromise: Promise<Data> }) {
|
||||
const data = use(dataPromise) // Unwraps the promise
|
||||
return <div>{data.content}</div>
|
||||
}
|
||||
|
||||
function DataSummary({ dataPromise }: { dataPromise: Promise<Data> }) {
|
||||
const data = use(dataPromise) // Reuses the same promise
|
||||
return <div>{data.summary}</div>
|
||||
}
|
||||
```
|
||||
|
||||
Both components share the same promise, so only one fetch occurs. Layout renders immediately while both components wait together.
|
||||
|
||||
**When NOT to use this pattern:**
|
||||
|
||||
- Critical data needed for layout decisions (affects positioning)
|
||||
- SEO-critical content above the fold
|
||||
- Small, fast queries where suspense overhead isn't worth it
|
||||
- When you want to avoid layout shift (loading → content jump)
|
||||
|
||||
**Trade-off:** Faster initial paint vs potential layout shift. Choose based on your UX priorities.
|
||||
@ -0,0 +1,59 @@
|
||||
---
|
||||
title: Avoid Barrel File Imports
|
||||
impact: CRITICAL
|
||||
impactDescription: 200-800ms import cost, slow builds
|
||||
tags: bundle, imports, tree-shaking, barrel-files, performance
|
||||
---
|
||||
|
||||
## Avoid Barrel File Imports
|
||||
|
||||
Import directly from source files instead of barrel files to avoid loading thousands of unused modules. **Barrel files** are entry points that re-export multiple modules (e.g., `index.js` that does `export * from './module'`).
|
||||
|
||||
Popular icon and component libraries can have **up to 10,000 re-exports** in their entry file. For many React packages, **it takes 200-800ms just to import them**, affecting both development speed and production cold starts.
|
||||
|
||||
**Why tree-shaking doesn't help:** When a library is marked as external (not bundled), the bundler can't optimize it. If you bundle it to enable tree-shaking, builds become substantially slower analyzing the entire module graph.
|
||||
|
||||
**Incorrect (imports entire library):**
|
||||
|
||||
```tsx
|
||||
import { Check, X, Menu } from 'lucide-react'
|
||||
// Loads 1,583 modules, takes ~2.8s extra in dev
|
||||
// Runtime cost: 200-800ms on every cold start
|
||||
|
||||
import { Button, TextField } from '@mui/material'
|
||||
// Loads 2,225 modules, takes ~4.2s extra in dev
|
||||
```
|
||||
|
||||
**Correct (imports only what you need):**
|
||||
|
||||
```tsx
|
||||
import Check from 'lucide-react/dist/esm/icons/check'
|
||||
import X from 'lucide-react/dist/esm/icons/x'
|
||||
import Menu from 'lucide-react/dist/esm/icons/menu'
|
||||
// Loads only 3 modules (~2KB vs ~1MB)
|
||||
|
||||
import Button from '@mui/material/Button'
|
||||
import TextField from '@mui/material/TextField'
|
||||
// Loads only what you use
|
||||
```
|
||||
|
||||
**Alternative (Next.js 13.5+):**
|
||||
|
||||
```js
|
||||
// next.config.js - use optimizePackageImports
|
||||
module.exports = {
|
||||
experimental: {
|
||||
optimizePackageImports: ['lucide-react', '@mui/material']
|
||||
}
|
||||
}
|
||||
|
||||
// Then you can keep the ergonomic barrel imports:
|
||||
import { Check, X, Menu } from 'lucide-react'
|
||||
// Automatically transformed to direct imports at build time
|
||||
```
|
||||
|
||||
Direct imports provide 15-70% faster dev boot, 28% faster builds, 40% faster cold starts, and significantly faster HMR.
|
||||
|
||||
Libraries commonly affected: `lucide-react`, `@mui/material`, `@mui/icons-material`, `@tabler/icons-react`, `react-icons`, `@headlessui/react`, `@radix-ui/react-*`, `lodash`, `ramda`, `date-fns`, `rxjs`, `react-use`.
|
||||
|
||||
Reference: [How we optimized package imports in Next.js](https://vercel.com/blog/how-we-optimized-package-imports-in-next-js)
|
||||
@ -0,0 +1,31 @@
|
||||
---
|
||||
title: Conditional Module Loading
|
||||
impact: HIGH
|
||||
impactDescription: loads large data only when needed
|
||||
tags: bundle, conditional-loading, lazy-loading
|
||||
---
|
||||
|
||||
## Conditional Module Loading
|
||||
|
||||
Load large data or modules only when a feature is activated.
|
||||
|
||||
**Example (lazy-load animation frames):**
|
||||
|
||||
```tsx
|
||||
function AnimationPlayer({ enabled, setEnabled }: { enabled: boolean; setEnabled: React.Dispatch<React.SetStateAction<boolean>> }) {
|
||||
const [frames, setFrames] = useState<Frame[] | null>(null)
|
||||
|
||||
useEffect(() => {
|
||||
if (enabled && !frames && typeof window !== 'undefined') {
|
||||
import('./animation-frames.js')
|
||||
.then(mod => setFrames(mod.frames))
|
||||
.catch(() => setEnabled(false))
|
||||
}
|
||||
}, [enabled, frames, setEnabled])
|
||||
|
||||
if (!frames) return <Skeleton />
|
||||
return <Canvas frames={frames} />
|
||||
}
|
||||
```
|
||||
|
||||
The `typeof window !== 'undefined'` check prevents bundling this module for SSR, optimizing server bundle size and build speed.
|
||||
@ -0,0 +1,49 @@
|
||||
---
|
||||
title: Defer Non-Critical Third-Party Libraries
|
||||
impact: MEDIUM
|
||||
impactDescription: loads after hydration
|
||||
tags: bundle, third-party, analytics, defer
|
||||
---
|
||||
|
||||
## Defer Non-Critical Third-Party Libraries
|
||||
|
||||
Analytics, logging, and error tracking don't block user interaction. Load them after hydration.
|
||||
|
||||
**Incorrect (blocks initial bundle):**
|
||||
|
||||
```tsx
|
||||
import { Analytics } from '@vercel/analytics/react'
|
||||
|
||||
export default function RootLayout({ children }) {
|
||||
return (
|
||||
<html>
|
||||
<body>
|
||||
{children}
|
||||
<Analytics />
|
||||
</body>
|
||||
</html>
|
||||
)
|
||||
}
|
||||
```
|
||||
|
||||
**Correct (loads after hydration):**
|
||||
|
||||
```tsx
|
||||
import dynamic from 'next/dynamic'
|
||||
|
||||
const Analytics = dynamic(
|
||||
() => import('@vercel/analytics/react').then(m => m.Analytics),
|
||||
{ ssr: false }
|
||||
)
|
||||
|
||||
export default function RootLayout({ children }) {
|
||||
return (
|
||||
<html>
|
||||
<body>
|
||||
{children}
|
||||
<Analytics />
|
||||
</body>
|
||||
</html>
|
||||
)
|
||||
}
|
||||
```
|
||||
@ -0,0 +1,35 @@
|
||||
---
|
||||
title: Dynamic Imports for Heavy Components
|
||||
impact: CRITICAL
|
||||
impactDescription: directly affects TTI and LCP
|
||||
tags: bundle, dynamic-import, code-splitting, next-dynamic
|
||||
---
|
||||
|
||||
## Dynamic Imports for Heavy Components
|
||||
|
||||
Use `next/dynamic` to lazy-load large components not needed on initial render.
|
||||
|
||||
**Incorrect (Monaco bundles with main chunk ~300KB):**
|
||||
|
||||
```tsx
|
||||
import { MonacoEditor } from './monaco-editor'
|
||||
|
||||
function CodePanel({ code }: { code: string }) {
|
||||
return <MonacoEditor value={code} />
|
||||
}
|
||||
```
|
||||
|
||||
**Correct (Monaco loads on demand):**
|
||||
|
||||
```tsx
|
||||
import dynamic from 'next/dynamic'
|
||||
|
||||
const MonacoEditor = dynamic(
|
||||
() => import('./monaco-editor').then(m => m.MonacoEditor),
|
||||
{ ssr: false }
|
||||
)
|
||||
|
||||
function CodePanel({ code }: { code: string }) {
|
||||
return <MonacoEditor value={code} />
|
||||
}
|
||||
```
|
||||
50
skills/vercel-react-best-practices/rules/bundle-preload.md
Normal file
50
skills/vercel-react-best-practices/rules/bundle-preload.md
Normal file
@ -0,0 +1,50 @@
|
||||
---
|
||||
title: Preload Based on User Intent
|
||||
impact: MEDIUM
|
||||
impactDescription: reduces perceived latency
|
||||
tags: bundle, preload, user-intent, hover
|
||||
---
|
||||
|
||||
## Preload Based on User Intent
|
||||
|
||||
Preload heavy bundles before they're needed to reduce perceived latency.
|
||||
|
||||
**Example (preload on hover/focus):**
|
||||
|
||||
```tsx
|
||||
function EditorButton({ onClick }: { onClick: () => void }) {
|
||||
const preload = () => {
|
||||
if (typeof window !== 'undefined') {
|
||||
void import('./monaco-editor')
|
||||
}
|
||||
}
|
||||
|
||||
return (
|
||||
<button
|
||||
onMouseEnter={preload}
|
||||
onFocus={preload}
|
||||
onClick={onClick}
|
||||
>
|
||||
Open Editor
|
||||
</button>
|
||||
)
|
||||
}
|
||||
```
|
||||
|
||||
**Example (preload when feature flag is enabled):**
|
||||
|
||||
```tsx
|
||||
function FlagsProvider({ children, flags }: Props) {
|
||||
useEffect(() => {
|
||||
if (flags.editorEnabled && typeof window !== 'undefined') {
|
||||
void import('./monaco-editor').then(mod => mod.init())
|
||||
}
|
||||
}, [flags.editorEnabled])
|
||||
|
||||
return <FlagsContext.Provider value={flags}>
|
||||
{children}
|
||||
</FlagsContext.Provider>
|
||||
}
|
||||
```
|
||||
|
||||
The `typeof window !== 'undefined'` check prevents bundling preloaded modules for SSR, optimizing server bundle size and build speed.
|
||||
@ -0,0 +1,74 @@
|
||||
---
|
||||
title: Deduplicate Global Event Listeners
|
||||
impact: LOW
|
||||
impactDescription: single listener for N components
|
||||
tags: client, swr, event-listeners, subscription
|
||||
---
|
||||
|
||||
## Deduplicate Global Event Listeners
|
||||
|
||||
Use `useSWRSubscription()` to share global event listeners across component instances.
|
||||
|
||||
**Incorrect (N instances = N listeners):**
|
||||
|
||||
```tsx
|
||||
function useKeyboardShortcut(key: string, callback: () => void) {
|
||||
useEffect(() => {
|
||||
const handler = (e: KeyboardEvent) => {
|
||||
if (e.metaKey && e.key === key) {
|
||||
callback()
|
||||
}
|
||||
}
|
||||
window.addEventListener('keydown', handler)
|
||||
return () => window.removeEventListener('keydown', handler)
|
||||
}, [key, callback])
|
||||
}
|
||||
```
|
||||
|
||||
When using the `useKeyboardShortcut` hook multiple times, each instance will register a new listener.
|
||||
|
||||
**Correct (N instances = 1 listener):**
|
||||
|
||||
```tsx
|
||||
import useSWRSubscription from 'swr/subscription'
|
||||
|
||||
// Module-level Map to track callbacks per key
|
||||
const keyCallbacks = new Map<string, Set<() => void>>()
|
||||
|
||||
function useKeyboardShortcut(key: string, callback: () => void) {
|
||||
// Register this callback in the Map
|
||||
useEffect(() => {
|
||||
if (!keyCallbacks.has(key)) {
|
||||
keyCallbacks.set(key, new Set())
|
||||
}
|
||||
keyCallbacks.get(key)!.add(callback)
|
||||
|
||||
return () => {
|
||||
const set = keyCallbacks.get(key)
|
||||
if (set) {
|
||||
set.delete(callback)
|
||||
if (set.size === 0) {
|
||||
keyCallbacks.delete(key)
|
||||
}
|
||||
}
|
||||
}
|
||||
}, [key, callback])
|
||||
|
||||
useSWRSubscription('global-keydown', () => {
|
||||
const handler = (e: KeyboardEvent) => {
|
||||
if (e.metaKey && keyCallbacks.has(e.key)) {
|
||||
keyCallbacks.get(e.key)!.forEach(cb => cb())
|
||||
}
|
||||
}
|
||||
window.addEventListener('keydown', handler)
|
||||
return () => window.removeEventListener('keydown', handler)
|
||||
})
|
||||
}
|
||||
|
||||
function Profile() {
|
||||
// Multiple shortcuts will share the same listener
|
||||
useKeyboardShortcut('p', () => { /* ... */ })
|
||||
useKeyboardShortcut('k', () => { /* ... */ })
|
||||
// ...
|
||||
}
|
||||
```
|
||||
@ -0,0 +1,71 @@
|
||||
---
|
||||
title: Version and Minimize localStorage Data
|
||||
impact: MEDIUM
|
||||
impactDescription: prevents schema conflicts, reduces storage size
|
||||
tags: client, localStorage, storage, versioning, data-minimization
|
||||
---
|
||||
|
||||
## Version and Minimize localStorage Data
|
||||
|
||||
Add version prefix to keys and store only needed fields. Prevents schema conflicts and accidental storage of sensitive data.
|
||||
|
||||
**Incorrect:**
|
||||
|
||||
```typescript
|
||||
// No version, stores everything, no error handling
|
||||
localStorage.setItem('userConfig', JSON.stringify(fullUserObject))
|
||||
const data = localStorage.getItem('userConfig')
|
||||
```
|
||||
|
||||
**Correct:**
|
||||
|
||||
```typescript
|
||||
const VERSION = 'v2'
|
||||
|
||||
function saveConfig(config: { theme: string; language: string }) {
|
||||
try {
|
||||
localStorage.setItem(`userConfig:${VERSION}`, JSON.stringify(config))
|
||||
} catch {
|
||||
// Throws in incognito/private browsing, quota exceeded, or disabled
|
||||
}
|
||||
}
|
||||
|
||||
function loadConfig() {
|
||||
try {
|
||||
const data = localStorage.getItem(`userConfig:${VERSION}`)
|
||||
return data ? JSON.parse(data) : null
|
||||
} catch {
|
||||
return null
|
||||
}
|
||||
}
|
||||
|
||||
// Migration from v1 to v2
|
||||
function migrate() {
|
||||
try {
|
||||
const v1 = localStorage.getItem('userConfig:v1')
|
||||
if (v1) {
|
||||
const old = JSON.parse(v1)
|
||||
saveConfig({ theme: old.darkMode ? 'dark' : 'light', language: old.lang })
|
||||
localStorage.removeItem('userConfig:v1')
|
||||
}
|
||||
} catch {}
|
||||
}
|
||||
```
|
||||
|
||||
**Store minimal fields from server responses:**
|
||||
|
||||
```typescript
|
||||
// User object has 20+ fields, only store what UI needs
|
||||
function cachePrefs(user: FullUser) {
|
||||
try {
|
||||
localStorage.setItem('prefs:v1', JSON.stringify({
|
||||
theme: user.preferences.theme,
|
||||
notifications: user.preferences.notifications
|
||||
}))
|
||||
} catch {}
|
||||
}
|
||||
```
|
||||
|
||||
**Always wrap in try-catch:** `getItem()` and `setItem()` throw in incognito/private browsing (Safari, Firefox), when quota exceeded, or when disabled.
|
||||
|
||||
**Benefits:** Schema evolution via versioning, reduced storage size, prevents storing tokens/PII/internal flags.
|
||||
@ -0,0 +1,48 @@
|
||||
---
|
||||
title: Use Passive Event Listeners for Scrolling Performance
|
||||
impact: MEDIUM
|
||||
impactDescription: eliminates scroll delay caused by event listeners
|
||||
tags: client, event-listeners, scrolling, performance, touch, wheel
|
||||
---
|
||||
|
||||
## Use Passive Event Listeners for Scrolling Performance
|
||||
|
||||
Add `{ passive: true }` to touch and wheel event listeners to enable immediate scrolling. Browsers normally wait for listeners to finish to check if `preventDefault()` is called, causing scroll delay.
|
||||
|
||||
**Incorrect:**
|
||||
|
||||
```typescript
|
||||
useEffect(() => {
|
||||
const handleTouch = (e: TouchEvent) => console.log(e.touches[0].clientX)
|
||||
const handleWheel = (e: WheelEvent) => console.log(e.deltaY)
|
||||
|
||||
document.addEventListener('touchstart', handleTouch)
|
||||
document.addEventListener('wheel', handleWheel)
|
||||
|
||||
return () => {
|
||||
document.removeEventListener('touchstart', handleTouch)
|
||||
document.removeEventListener('wheel', handleWheel)
|
||||
}
|
||||
}, [])
|
||||
```
|
||||
|
||||
**Correct:**
|
||||
|
||||
```typescript
|
||||
useEffect(() => {
|
||||
const handleTouch = (e: TouchEvent) => console.log(e.touches[0].clientX)
|
||||
const handleWheel = (e: WheelEvent) => console.log(e.deltaY)
|
||||
|
||||
document.addEventListener('touchstart', handleTouch, { passive: true })
|
||||
document.addEventListener('wheel', handleWheel, { passive: true })
|
||||
|
||||
return () => {
|
||||
document.removeEventListener('touchstart', handleTouch)
|
||||
document.removeEventListener('wheel', handleWheel)
|
||||
}
|
||||
}, [])
|
||||
```
|
||||
|
||||
**Use passive when:** tracking/analytics, logging, any listener that doesn't call `preventDefault()`.
|
||||
|
||||
**Don't use passive when:** implementing custom swipe gestures, custom zoom controls, or any listener that needs `preventDefault()`.
|
||||
56
skills/vercel-react-best-practices/rules/client-swr-dedup.md
Normal file
56
skills/vercel-react-best-practices/rules/client-swr-dedup.md
Normal file
@ -0,0 +1,56 @@
|
||||
---
|
||||
title: Use SWR for Automatic Deduplication
|
||||
impact: MEDIUM-HIGH
|
||||
impactDescription: automatic deduplication
|
||||
tags: client, swr, deduplication, data-fetching
|
||||
---
|
||||
|
||||
## Use SWR for Automatic Deduplication
|
||||
|
||||
SWR enables request deduplication, caching, and revalidation across component instances.
|
||||
|
||||
**Incorrect (no deduplication, each instance fetches):**
|
||||
|
||||
```tsx
|
||||
function UserList() {
|
||||
const [users, setUsers] = useState([])
|
||||
useEffect(() => {
|
||||
fetch('/api/users')
|
||||
.then(r => r.json())
|
||||
.then(setUsers)
|
||||
}, [])
|
||||
}
|
||||
```
|
||||
|
||||
**Correct (multiple instances share one request):**
|
||||
|
||||
```tsx
|
||||
import useSWR from 'swr'
|
||||
|
||||
function UserList() {
|
||||
const { data: users } = useSWR('/api/users', fetcher)
|
||||
}
|
||||
```
|
||||
|
||||
**For immutable data:**
|
||||
|
||||
```tsx
|
||||
import { useImmutableSWR } from '@/lib/swr'
|
||||
|
||||
function StaticContent() {
|
||||
const { data } = useImmutableSWR('/api/config', fetcher)
|
||||
}
|
||||
```
|
||||
|
||||
**For mutations:**
|
||||
|
||||
```tsx
|
||||
import { useSWRMutation } from 'swr/mutation'
|
||||
|
||||
function UpdateButton() {
|
||||
const { trigger } = useSWRMutation('/api/user', updateUser)
|
||||
return <button onClick={() => trigger()}>Update</button>
|
||||
}
|
||||
```
|
||||
|
||||
Reference: [https://swr.vercel.app](https://swr.vercel.app)
|
||||
107
skills/vercel-react-best-practices/rules/js-batch-dom-css.md
Normal file
107
skills/vercel-react-best-practices/rules/js-batch-dom-css.md
Normal file
@ -0,0 +1,107 @@
|
||||
---
|
||||
title: Avoid Layout Thrashing
|
||||
impact: MEDIUM
|
||||
impactDescription: prevents forced synchronous layouts and reduces performance bottlenecks
|
||||
tags: javascript, dom, css, performance, reflow, layout-thrashing
|
||||
---
|
||||
|
||||
## Avoid Layout Thrashing
|
||||
|
||||
Avoid interleaving style writes with layout reads. When you read a layout property (like `offsetWidth`, `getBoundingClientRect()`, or `getComputedStyle()`) between style changes, the browser is forced to trigger a synchronous reflow.
|
||||
|
||||
**This is OK (browser batches style changes):**
|
||||
```typescript
|
||||
function updateElementStyles(element: HTMLElement) {
|
||||
// Each line invalidates style, but browser batches the recalculation
|
||||
element.style.width = '100px'
|
||||
element.style.height = '200px'
|
||||
element.style.backgroundColor = 'blue'
|
||||
element.style.border = '1px solid black'
|
||||
}
|
||||
```
|
||||
|
||||
**Incorrect (interleaved reads and writes force reflows):**
|
||||
```typescript
|
||||
function layoutThrashing(element: HTMLElement) {
|
||||
element.style.width = '100px'
|
||||
const width = element.offsetWidth // Forces reflow
|
||||
element.style.height = '200px'
|
||||
const height = element.offsetHeight // Forces another reflow
|
||||
}
|
||||
```
|
||||
|
||||
**Correct (batch writes, then read once):**
|
||||
```typescript
|
||||
function updateElementStyles(element: HTMLElement) {
|
||||
// Batch all writes together
|
||||
element.style.width = '100px'
|
||||
element.style.height = '200px'
|
||||
element.style.backgroundColor = 'blue'
|
||||
element.style.border = '1px solid black'
|
||||
|
||||
// Read after all writes are done (single reflow)
|
||||
const { width, height } = element.getBoundingClientRect()
|
||||
}
|
||||
```
|
||||
|
||||
**Correct (batch reads, then writes):**
|
||||
```typescript
|
||||
function avoidThrashing(element: HTMLElement) {
|
||||
// Read phase - all layout queries first
|
||||
const rect1 = element.getBoundingClientRect()
|
||||
const offsetWidth = element.offsetWidth
|
||||
const offsetHeight = element.offsetHeight
|
||||
|
||||
// Write phase - all style changes after
|
||||
element.style.width = '100px'
|
||||
element.style.height = '200px'
|
||||
}
|
||||
```
|
||||
|
||||
**Better: use CSS classes**
|
||||
```css
|
||||
.highlighted-box {
|
||||
width: 100px;
|
||||
height: 200px;
|
||||
background-color: blue;
|
||||
border: 1px solid black;
|
||||
}
|
||||
```
|
||||
```typescript
|
||||
function updateElementStyles(element: HTMLElement) {
|
||||
element.classList.add('highlighted-box')
|
||||
|
||||
const { width, height } = element.getBoundingClientRect()
|
||||
}
|
||||
```
|
||||
|
||||
**React example:**
|
||||
```tsx
|
||||
// Incorrect: interleaving style changes with layout queries
|
||||
function Box({ isHighlighted }: { isHighlighted: boolean }) {
|
||||
const ref = useRef<HTMLDivElement>(null)
|
||||
|
||||
useEffect(() => {
|
||||
if (ref.current && isHighlighted) {
|
||||
ref.current.style.width = '100px'
|
||||
const width = ref.current.offsetWidth // Forces layout
|
||||
ref.current.style.height = '200px'
|
||||
}
|
||||
}, [isHighlighted])
|
||||
|
||||
return <div ref={ref}>Content</div>
|
||||
}
|
||||
|
||||
// Correct: toggle class
|
||||
function Box({ isHighlighted }: { isHighlighted: boolean }) {
|
||||
return (
|
||||
<div className={isHighlighted ? 'highlighted-box' : ''}>
|
||||
Content
|
||||
</div>
|
||||
)
|
||||
}
|
||||
```
|
||||
|
||||
Prefer CSS classes over inline styles when possible. CSS files are cached by the browser, and classes provide better separation of concerns and are easier to maintain.
|
||||
|
||||
See [this gist](https://gist.github.com/paulirish/5d52fb081b3570c81e3a) and [CSS Triggers](https://csstriggers.com/) for more information on layout-forcing operations.
|
||||
@ -0,0 +1,80 @@
|
||||
---
|
||||
title: Cache Repeated Function Calls
|
||||
impact: MEDIUM
|
||||
impactDescription: avoid redundant computation
|
||||
tags: javascript, cache, memoization, performance
|
||||
---
|
||||
|
||||
## Cache Repeated Function Calls
|
||||
|
||||
Use a module-level Map to cache function results when the same function is called repeatedly with the same inputs during render.
|
||||
|
||||
**Incorrect (redundant computation):**
|
||||
|
||||
```typescript
|
||||
function ProjectList({ projects }: { projects: Project[] }) {
|
||||
return (
|
||||
<div>
|
||||
{projects.map(project => {
|
||||
// slugify() called 100+ times for same project names
|
||||
const slug = slugify(project.name)
|
||||
|
||||
return <ProjectCard key={project.id} slug={slug} />
|
||||
})}
|
||||
</div>
|
||||
)
|
||||
}
|
||||
```
|
||||
|
||||
**Correct (cached results):**
|
||||
|
||||
```typescript
|
||||
// Module-level cache
|
||||
const slugifyCache = new Map<string, string>()
|
||||
|
||||
function cachedSlugify(text: string): string {
|
||||
if (slugifyCache.has(text)) {
|
||||
return slugifyCache.get(text)!
|
||||
}
|
||||
const result = slugify(text)
|
||||
slugifyCache.set(text, result)
|
||||
return result
|
||||
}
|
||||
|
||||
function ProjectList({ projects }: { projects: Project[] }) {
|
||||
return (
|
||||
<div>
|
||||
{projects.map(project => {
|
||||
// Computed only once per unique project name
|
||||
const slug = cachedSlugify(project.name)
|
||||
|
||||
return <ProjectCard key={project.id} slug={slug} />
|
||||
})}
|
||||
</div>
|
||||
)
|
||||
}
|
||||
```
|
||||
|
||||
**Simpler pattern for single-value functions:**
|
||||
|
||||
```typescript
|
||||
let isLoggedInCache: boolean | null = null
|
||||
|
||||
function isLoggedIn(): boolean {
|
||||
if (isLoggedInCache !== null) {
|
||||
return isLoggedInCache
|
||||
}
|
||||
|
||||
isLoggedInCache = document.cookie.includes('auth=')
|
||||
return isLoggedInCache
|
||||
}
|
||||
|
||||
// Clear cache when auth changes
|
||||
function onAuthChange() {
|
||||
isLoggedInCache = null
|
||||
}
|
||||
```
|
||||
|
||||
Use a Map (not a hook) so it works everywhere: utilities, event handlers, not just React components.
|
||||
|
||||
Reference: [How we made the Vercel Dashboard twice as fast](https://vercel.com/blog/how-we-made-the-vercel-dashboard-twice-as-fast)
|
||||
@ -0,0 +1,28 @@
|
||||
---
|
||||
title: Cache Property Access in Loops
|
||||
impact: LOW-MEDIUM
|
||||
impactDescription: reduces lookups
|
||||
tags: javascript, loops, optimization, caching
|
||||
---
|
||||
|
||||
## Cache Property Access in Loops
|
||||
|
||||
Cache object property lookups in hot paths.
|
||||
|
||||
**Incorrect (3 lookups × N iterations):**
|
||||
|
||||
```typescript
|
||||
for (let i = 0; i < arr.length; i++) {
|
||||
process(obj.config.settings.value)
|
||||
}
|
||||
```
|
||||
|
||||
**Correct (1 lookup total):**
|
||||
|
||||
```typescript
|
||||
const value = obj.config.settings.value
|
||||
const len = arr.length
|
||||
for (let i = 0; i < len; i++) {
|
||||
process(value)
|
||||
}
|
||||
```
|
||||
70
skills/vercel-react-best-practices/rules/js-cache-storage.md
Normal file
70
skills/vercel-react-best-practices/rules/js-cache-storage.md
Normal file
@ -0,0 +1,70 @@
|
||||
---
|
||||
title: Cache Storage API Calls
|
||||
impact: LOW-MEDIUM
|
||||
impactDescription: reduces expensive I/O
|
||||
tags: javascript, localStorage, storage, caching, performance
|
||||
---
|
||||
|
||||
## Cache Storage API Calls
|
||||
|
||||
`localStorage`, `sessionStorage`, and `document.cookie` are synchronous and expensive. Cache reads in memory.
|
||||
|
||||
**Incorrect (reads storage on every call):**
|
||||
|
||||
```typescript
|
||||
function getTheme() {
|
||||
return localStorage.getItem('theme') ?? 'light'
|
||||
}
|
||||
// Called 10 times = 10 storage reads
|
||||
```
|
||||
|
||||
**Correct (Map cache):**
|
||||
|
||||
```typescript
|
||||
const storageCache = new Map<string, string | null>()
|
||||
|
||||
function getLocalStorage(key: string) {
|
||||
if (!storageCache.has(key)) {
|
||||
storageCache.set(key, localStorage.getItem(key))
|
||||
}
|
||||
return storageCache.get(key)
|
||||
}
|
||||
|
||||
function setLocalStorage(key: string, value: string) {
|
||||
localStorage.setItem(key, value)
|
||||
storageCache.set(key, value) // keep cache in sync
|
||||
}
|
||||
```
|
||||
|
||||
Use a Map (not a hook) so it works everywhere: utilities, event handlers, not just React components.
|
||||
|
||||
**Cookie caching:**
|
||||
|
||||
```typescript
|
||||
let cookieCache: Record<string, string> | null = null
|
||||
|
||||
function getCookie(name: string) {
|
||||
if (!cookieCache) {
|
||||
cookieCache = Object.fromEntries(
|
||||
document.cookie.split('; ').map(c => c.split('='))
|
||||
)
|
||||
}
|
||||
return cookieCache[name]
|
||||
}
|
||||
```
|
||||
|
||||
**Important (invalidate on external changes):**
|
||||
|
||||
If storage can change externally (another tab, server-set cookies), invalidate cache:
|
||||
|
||||
```typescript
|
||||
window.addEventListener('storage', (e) => {
|
||||
if (e.key) storageCache.delete(e.key)
|
||||
})
|
||||
|
||||
document.addEventListener('visibilitychange', () => {
|
||||
if (document.visibilityState === 'visible') {
|
||||
storageCache.clear()
|
||||
}
|
||||
})
|
||||
```
|
||||
@ -0,0 +1,32 @@
|
||||
---
|
||||
title: Combine Multiple Array Iterations
|
||||
impact: LOW-MEDIUM
|
||||
impactDescription: reduces iterations
|
||||
tags: javascript, arrays, loops, performance
|
||||
---
|
||||
|
||||
## Combine Multiple Array Iterations
|
||||
|
||||
Multiple `.filter()` or `.map()` calls iterate the array multiple times. Combine into one loop.
|
||||
|
||||
**Incorrect (3 iterations):**
|
||||
|
||||
```typescript
|
||||
const admins = users.filter(u => u.isAdmin)
|
||||
const testers = users.filter(u => u.isTester)
|
||||
const inactive = users.filter(u => !u.isActive)
|
||||
```
|
||||
|
||||
**Correct (1 iteration):**
|
||||
|
||||
```typescript
|
||||
const admins: User[] = []
|
||||
const testers: User[] = []
|
||||
const inactive: User[] = []
|
||||
|
||||
for (const user of users) {
|
||||
if (user.isAdmin) admins.push(user)
|
||||
if (user.isTester) testers.push(user)
|
||||
if (!user.isActive) inactive.push(user)
|
||||
}
|
||||
```
|
||||
50
skills/vercel-react-best-practices/rules/js-early-exit.md
Normal file
50
skills/vercel-react-best-practices/rules/js-early-exit.md
Normal file
@ -0,0 +1,50 @@
|
||||
---
|
||||
title: Early Return from Functions
|
||||
impact: LOW-MEDIUM
|
||||
impactDescription: avoids unnecessary computation
|
||||
tags: javascript, functions, optimization, early-return
|
||||
---
|
||||
|
||||
## Early Return from Functions
|
||||
|
||||
Return early when result is determined to skip unnecessary processing.
|
||||
|
||||
**Incorrect (processes all items even after finding answer):**
|
||||
|
||||
```typescript
|
||||
function validateUsers(users: User[]) {
|
||||
let hasError = false
|
||||
let errorMessage = ''
|
||||
|
||||
for (const user of users) {
|
||||
if (!user.email) {
|
||||
hasError = true
|
||||
errorMessage = 'Email required'
|
||||
}
|
||||
if (!user.name) {
|
||||
hasError = true
|
||||
errorMessage = 'Name required'
|
||||
}
|
||||
// Continues checking all users even after error found
|
||||
}
|
||||
|
||||
return hasError ? { valid: false, error: errorMessage } : { valid: true }
|
||||
}
|
||||
```
|
||||
|
||||
**Correct (returns immediately on first error):**
|
||||
|
||||
```typescript
|
||||
function validateUsers(users: User[]) {
|
||||
for (const user of users) {
|
||||
if (!user.email) {
|
||||
return { valid: false, error: 'Email required' }
|
||||
}
|
||||
if (!user.name) {
|
||||
return { valid: false, error: 'Name required' }
|
||||
}
|
||||
}
|
||||
|
||||
return { valid: true }
|
||||
}
|
||||
```
|
||||
45
skills/vercel-react-best-practices/rules/js-hoist-regexp.md
Normal file
45
skills/vercel-react-best-practices/rules/js-hoist-regexp.md
Normal file
@ -0,0 +1,45 @@
|
||||
---
|
||||
title: Hoist RegExp Creation
|
||||
impact: LOW-MEDIUM
|
||||
impactDescription: avoids recreation
|
||||
tags: javascript, regexp, optimization, memoization
|
||||
---
|
||||
|
||||
## Hoist RegExp Creation
|
||||
|
||||
Don't create RegExp inside render. Hoist to module scope or memoize with `useMemo()`.
|
||||
|
||||
**Incorrect (new RegExp every render):**
|
||||
|
||||
```tsx
|
||||
function Highlighter({ text, query }: Props) {
|
||||
const regex = new RegExp(`(${query})`, 'gi')
|
||||
const parts = text.split(regex)
|
||||
return <>{parts.map((part, i) => ...)}</>
|
||||
}
|
||||
```
|
||||
|
||||
**Correct (memoize or hoist):**
|
||||
|
||||
```tsx
|
||||
const EMAIL_REGEX = /^[^\s@]+@[^\s@]+\.[^\s@]+$/
|
||||
|
||||
function Highlighter({ text, query }: Props) {
|
||||
const regex = useMemo(
|
||||
() => new RegExp(`(${escapeRegex(query)})`, 'gi'),
|
||||
[query]
|
||||
)
|
||||
const parts = text.split(regex)
|
||||
return <>{parts.map((part, i) => ...)}</>
|
||||
}
|
||||
```
|
||||
|
||||
**Warning (global regex has mutable state):**
|
||||
|
||||
Global regex (`/g`) has mutable `lastIndex` state:
|
||||
|
||||
```typescript
|
||||
const regex = /foo/g
|
||||
regex.test('foo') // true, lastIndex = 3
|
||||
regex.test('foo') // false, lastIndex = 0
|
||||
```
|
||||
37
skills/vercel-react-best-practices/rules/js-index-maps.md
Normal file
37
skills/vercel-react-best-practices/rules/js-index-maps.md
Normal file
@ -0,0 +1,37 @@
|
||||
---
|
||||
title: Build Index Maps for Repeated Lookups
|
||||
impact: LOW-MEDIUM
|
||||
impactDescription: 1M ops to 2K ops
|
||||
tags: javascript, map, indexing, optimization, performance
|
||||
---
|
||||
|
||||
## Build Index Maps for Repeated Lookups
|
||||
|
||||
Multiple `.find()` calls by the same key should use a Map.
|
||||
|
||||
**Incorrect (O(n) per lookup):**
|
||||
|
||||
```typescript
|
||||
function processOrders(orders: Order[], users: User[]) {
|
||||
return orders.map(order => ({
|
||||
...order,
|
||||
user: users.find(u => u.id === order.userId)
|
||||
}))
|
||||
}
|
||||
```
|
||||
|
||||
**Correct (O(1) per lookup):**
|
||||
|
||||
```typescript
|
||||
function processOrders(orders: Order[], users: User[]) {
|
||||
const userById = new Map(users.map(u => [u.id, u]))
|
||||
|
||||
return orders.map(order => ({
|
||||
...order,
|
||||
user: userById.get(order.userId)
|
||||
}))
|
||||
}
|
||||
```
|
||||
|
||||
Build map once (O(n)), then all lookups are O(1).
|
||||
For 1000 orders × 1000 users: 1M ops → 2K ops.
|
||||
@ -0,0 +1,49 @@
|
||||
---
|
||||
title: Early Length Check for Array Comparisons
|
||||
impact: MEDIUM-HIGH
|
||||
impactDescription: avoids expensive operations when lengths differ
|
||||
tags: javascript, arrays, performance, optimization, comparison
|
||||
---
|
||||
|
||||
## Early Length Check for Array Comparisons
|
||||
|
||||
When comparing arrays with expensive operations (sorting, deep equality, serialization), check lengths first. If lengths differ, the arrays cannot be equal.
|
||||
|
||||
In real-world applications, this optimization is especially valuable when the comparison runs in hot paths (event handlers, render loops).
|
||||
|
||||
**Incorrect (always runs expensive comparison):**
|
||||
|
||||
```typescript
|
||||
function hasChanges(current: string[], original: string[]) {
|
||||
// Always sorts and joins, even when lengths differ
|
||||
return current.sort().join() !== original.sort().join()
|
||||
}
|
||||
```
|
||||
|
||||
Two O(n log n) sorts run even when `current.length` is 5 and `original.length` is 100. There is also overhead of joining the arrays and comparing the strings.
|
||||
|
||||
**Correct (O(1) length check first):**
|
||||
|
||||
```typescript
|
||||
function hasChanges(current: string[], original: string[]) {
|
||||
// Early return if lengths differ
|
||||
if (current.length !== original.length) {
|
||||
return true
|
||||
}
|
||||
// Only sort when lengths match
|
||||
const currentSorted = current.toSorted()
|
||||
const originalSorted = original.toSorted()
|
||||
for (let i = 0; i < currentSorted.length; i++) {
|
||||
if (currentSorted[i] !== originalSorted[i]) {
|
||||
return true
|
||||
}
|
||||
}
|
||||
return false
|
||||
}
|
||||
```
|
||||
|
||||
This new approach is more efficient because:
|
||||
- It avoids the overhead of sorting and joining the arrays when lengths differ
|
||||
- It avoids consuming memory for the joined strings (especially important for large arrays)
|
||||
- It avoids mutating the original arrays
|
||||
- It returns early when a difference is found
|
||||
82
skills/vercel-react-best-practices/rules/js-min-max-loop.md
Normal file
82
skills/vercel-react-best-practices/rules/js-min-max-loop.md
Normal file
@ -0,0 +1,82 @@
|
||||
---
|
||||
title: Use Loop for Min/Max Instead of Sort
|
||||
impact: LOW
|
||||
impactDescription: O(n) instead of O(n log n)
|
||||
tags: javascript, arrays, performance, sorting, algorithms
|
||||
---
|
||||
|
||||
## Use Loop for Min/Max Instead of Sort
|
||||
|
||||
Finding the smallest or largest element only requires a single pass through the array. Sorting is wasteful and slower.
|
||||
|
||||
**Incorrect (O(n log n) - sort to find latest):**
|
||||
|
||||
```typescript
|
||||
interface Project {
|
||||
id: string
|
||||
name: string
|
||||
updatedAt: number
|
||||
}
|
||||
|
||||
function getLatestProject(projects: Project[]) {
|
||||
const sorted = [...projects].sort((a, b) => b.updatedAt - a.updatedAt)
|
||||
return sorted[0]
|
||||
}
|
||||
```
|
||||
|
||||
Sorts the entire array just to find the maximum value.
|
||||
|
||||
**Incorrect (O(n log n) - sort for oldest and newest):**
|
||||
|
||||
```typescript
|
||||
function getOldestAndNewest(projects: Project[]) {
|
||||
const sorted = [...projects].sort((a, b) => a.updatedAt - b.updatedAt)
|
||||
return { oldest: sorted[0], newest: sorted[sorted.length - 1] }
|
||||
}
|
||||
```
|
||||
|
||||
Still sorts unnecessarily when only min/max are needed.
|
||||
|
||||
**Correct (O(n) - single loop):**
|
||||
|
||||
```typescript
|
||||
function getLatestProject(projects: Project[]) {
|
||||
if (projects.length === 0) return null
|
||||
|
||||
let latest = projects[0]
|
||||
|
||||
for (let i = 1; i < projects.length; i++) {
|
||||
if (projects[i].updatedAt > latest.updatedAt) {
|
||||
latest = projects[i]
|
||||
}
|
||||
}
|
||||
|
||||
return latest
|
||||
}
|
||||
|
||||
function getOldestAndNewest(projects: Project[]) {
|
||||
if (projects.length === 0) return { oldest: null, newest: null }
|
||||
|
||||
let oldest = projects[0]
|
||||
let newest = projects[0]
|
||||
|
||||
for (let i = 1; i < projects.length; i++) {
|
||||
if (projects[i].updatedAt < oldest.updatedAt) oldest = projects[i]
|
||||
if (projects[i].updatedAt > newest.updatedAt) newest = projects[i]
|
||||
}
|
||||
|
||||
return { oldest, newest }
|
||||
}
|
||||
```
|
||||
|
||||
Single pass through the array, no copying, no sorting.
|
||||
|
||||
**Alternative (Math.min/Math.max for small arrays):**
|
||||
|
||||
```typescript
|
||||
const numbers = [5, 2, 8, 1, 9]
|
||||
const min = Math.min(...numbers)
|
||||
const max = Math.max(...numbers)
|
||||
```
|
||||
|
||||
This works for small arrays, but can be slower or just throw an error for very large arrays due to spread operator limitations. Maximal array length is approximately 124000 in Chrome 143 and 638000 in Safari 18; exact numbers may vary - see [the fiddle](https://jsfiddle.net/qw1jabsx/4/). Use the loop approach for reliability.
|
||||
@ -0,0 +1,24 @@
|
||||
---
|
||||
title: Use Set/Map for O(1) Lookups
|
||||
impact: LOW-MEDIUM
|
||||
impactDescription: O(n) to O(1)
|
||||
tags: javascript, set, map, data-structures, performance
|
||||
---
|
||||
|
||||
## Use Set/Map for O(1) Lookups
|
||||
|
||||
Convert arrays to Set/Map for repeated membership checks.
|
||||
|
||||
**Incorrect (O(n) per check):**
|
||||
|
||||
```typescript
|
||||
const allowedIds = ['a', 'b', 'c', ...]
|
||||
items.filter(item => allowedIds.includes(item.id))
|
||||
```
|
||||
|
||||
**Correct (O(1) per check):**
|
||||
|
||||
```typescript
|
||||
const allowedIds = new Set(['a', 'b', 'c', ...])
|
||||
items.filter(item => allowedIds.has(item.id))
|
||||
```
|
||||
@ -0,0 +1,57 @@
|
||||
---
|
||||
title: Use toSorted() Instead of sort() for Immutability
|
||||
impact: MEDIUM-HIGH
|
||||
impactDescription: prevents mutation bugs in React state
|
||||
tags: javascript, arrays, immutability, react, state, mutation
|
||||
---
|
||||
|
||||
## Use toSorted() Instead of sort() for Immutability
|
||||
|
||||
`.sort()` mutates the array in place, which can cause bugs with React state and props. Use `.toSorted()` to create a new sorted array without mutation.
|
||||
|
||||
**Incorrect (mutates original array):**
|
||||
|
||||
```typescript
|
||||
function UserList({ users }: { users: User[] }) {
|
||||
// Mutates the users prop array!
|
||||
const sorted = useMemo(
|
||||
() => users.sort((a, b) => a.name.localeCompare(b.name)),
|
||||
[users]
|
||||
)
|
||||
return <div>{sorted.map(renderUser)}</div>
|
||||
}
|
||||
```
|
||||
|
||||
**Correct (creates new array):**
|
||||
|
||||
```typescript
|
||||
function UserList({ users }: { users: User[] }) {
|
||||
// Creates new sorted array, original unchanged
|
||||
const sorted = useMemo(
|
||||
() => users.toSorted((a, b) => a.name.localeCompare(b.name)),
|
||||
[users]
|
||||
)
|
||||
return <div>{sorted.map(renderUser)}</div>
|
||||
}
|
||||
```
|
||||
|
||||
**Why this matters in React:**
|
||||
|
||||
1. Props/state mutations break React's immutability model - React expects props and state to be treated as read-only
|
||||
2. Causes stale closure bugs - Mutating arrays inside closures (callbacks, effects) can lead to unexpected behavior
|
||||
|
||||
**Browser support (fallback for older browsers):**
|
||||
|
||||
`.toSorted()` is available in all modern browsers (Chrome 110+, Safari 16+, Firefox 115+, Node.js 20+). For older environments, use spread operator:
|
||||
|
||||
```typescript
|
||||
// Fallback for older browsers
|
||||
const sorted = [...items].sort((a, b) => a.value - b.value)
|
||||
```
|
||||
|
||||
**Other immutable array methods:**
|
||||
|
||||
- `.toSorted()` - immutable sort
|
||||
- `.toReversed()` - immutable reverse
|
||||
- `.toSpliced()` - immutable splice
|
||||
- `.with()` - immutable element replacement
|
||||
@ -0,0 +1,26 @@
|
||||
---
|
||||
title: Use Activity Component for Show/Hide
|
||||
impact: MEDIUM
|
||||
impactDescription: preserves state/DOM
|
||||
tags: rendering, activity, visibility, state-preservation
|
||||
---
|
||||
|
||||
## Use Activity Component for Show/Hide
|
||||
|
||||
Use React's `<Activity>` to preserve state/DOM for expensive components that frequently toggle visibility.
|
||||
|
||||
**Usage:**
|
||||
|
||||
```tsx
|
||||
import { Activity } from 'react'
|
||||
|
||||
function Dropdown({ isOpen }: Props) {
|
||||
return (
|
||||
<Activity mode={isOpen ? 'visible' : 'hidden'}>
|
||||
<ExpensiveMenu />
|
||||
</Activity>
|
||||
)
|
||||
}
|
||||
```
|
||||
|
||||
Avoids expensive re-renders and state loss.
|
||||
@ -0,0 +1,47 @@
|
||||
---
|
||||
title: Animate SVG Wrapper Instead of SVG Element
|
||||
impact: LOW
|
||||
impactDescription: enables hardware acceleration
|
||||
tags: rendering, svg, css, animation, performance
|
||||
---
|
||||
|
||||
## Animate SVG Wrapper Instead of SVG Element
|
||||
|
||||
Many browsers don't have hardware acceleration for CSS3 animations on SVG elements. Wrap SVG in a `<div>` and animate the wrapper instead.
|
||||
|
||||
**Incorrect (animating SVG directly - no hardware acceleration):**
|
||||
|
||||
```tsx
|
||||
function LoadingSpinner() {
|
||||
return (
|
||||
<svg
|
||||
className="animate-spin"
|
||||
width="24"
|
||||
height="24"
|
||||
viewBox="0 0 24 24"
|
||||
>
|
||||
<circle cx="12" cy="12" r="10" stroke="currentColor" />
|
||||
</svg>
|
||||
)
|
||||
}
|
||||
```
|
||||
|
||||
**Correct (animating wrapper div - hardware accelerated):**
|
||||
|
||||
```tsx
|
||||
function LoadingSpinner() {
|
||||
return (
|
||||
<div className="animate-spin">
|
||||
<svg
|
||||
width="24"
|
||||
height="24"
|
||||
viewBox="0 0 24 24"
|
||||
>
|
||||
<circle cx="12" cy="12" r="10" stroke="currentColor" />
|
||||
</svg>
|
||||
</div>
|
||||
)
|
||||
}
|
||||
```
|
||||
|
||||
This applies to all CSS transforms and transitions (`transform`, `opacity`, `translate`, `scale`, `rotate`). The wrapper div allows browsers to use GPU acceleration for smoother animations.
|
||||
@ -0,0 +1,40 @@
|
||||
---
|
||||
title: Use Explicit Conditional Rendering
|
||||
impact: LOW
|
||||
impactDescription: prevents rendering 0 or NaN
|
||||
tags: rendering, conditional, jsx, falsy-values
|
||||
---
|
||||
|
||||
## Use Explicit Conditional Rendering
|
||||
|
||||
Use explicit ternary operators (`? :`) instead of `&&` for conditional rendering when the condition can be `0`, `NaN`, or other falsy values that render.
|
||||
|
||||
**Incorrect (renders "0" when count is 0):**
|
||||
|
||||
```tsx
|
||||
function Badge({ count }: { count: number }) {
|
||||
return (
|
||||
<div>
|
||||
{count && <span className="badge">{count}</span>}
|
||||
</div>
|
||||
)
|
||||
}
|
||||
|
||||
// When count = 0, renders: <div>0</div>
|
||||
// When count = 5, renders: <div><span class="badge">5</span></div>
|
||||
```
|
||||
|
||||
**Correct (renders nothing when count is 0):**
|
||||
|
||||
```tsx
|
||||
function Badge({ count }: { count: number }) {
|
||||
return (
|
||||
<div>
|
||||
{count > 0 ? <span className="badge">{count}</span> : null}
|
||||
</div>
|
||||
)
|
||||
}
|
||||
|
||||
// When count = 0, renders: <div></div>
|
||||
// When count = 5, renders: <div><span class="badge">5</span></div>
|
||||
```
|
||||
@ -0,0 +1,38 @@
|
||||
---
|
||||
title: CSS content-visibility for Long Lists
|
||||
impact: HIGH
|
||||
impactDescription: faster initial render
|
||||
tags: rendering, css, content-visibility, long-lists
|
||||
---
|
||||
|
||||
## CSS content-visibility for Long Lists
|
||||
|
||||
Apply `content-visibility: auto` to defer off-screen rendering.
|
||||
|
||||
**CSS:**
|
||||
|
||||
```css
|
||||
.message-item {
|
||||
content-visibility: auto;
|
||||
contain-intrinsic-size: 0 80px;
|
||||
}
|
||||
```
|
||||
|
||||
**Example:**
|
||||
|
||||
```tsx
|
||||
function MessageList({ messages }: { messages: Message[] }) {
|
||||
return (
|
||||
<div className="overflow-y-auto h-screen">
|
||||
{messages.map(msg => (
|
||||
<div key={msg.id} className="message-item">
|
||||
<Avatar user={msg.author} />
|
||||
<div>{msg.content}</div>
|
||||
</div>
|
||||
))}
|
||||
</div>
|
||||
)
|
||||
}
|
||||
```
|
||||
|
||||
For 1000 messages, browser skips layout/paint for ~990 off-screen items (10× faster initial render).
|
||||
@ -0,0 +1,46 @@
|
||||
---
|
||||
title: Hoist Static JSX Elements
|
||||
impact: LOW
|
||||
impactDescription: avoids re-creation
|
||||
tags: rendering, jsx, static, optimization
|
||||
---
|
||||
|
||||
## Hoist Static JSX Elements
|
||||
|
||||
Extract static JSX outside components to avoid re-creation.
|
||||
|
||||
**Incorrect (recreates element every render):**
|
||||
|
||||
```tsx
|
||||
function LoadingSkeleton() {
|
||||
return <div className="animate-pulse h-20 bg-gray-200" />
|
||||
}
|
||||
|
||||
function Container() {
|
||||
return (
|
||||
<div>
|
||||
{loading && <LoadingSkeleton />}
|
||||
</div>
|
||||
)
|
||||
}
|
||||
```
|
||||
|
||||
**Correct (reuses same element):**
|
||||
|
||||
```tsx
|
||||
const loadingSkeleton = (
|
||||
<div className="animate-pulse h-20 bg-gray-200" />
|
||||
)
|
||||
|
||||
function Container() {
|
||||
return (
|
||||
<div>
|
||||
{loading && loadingSkeleton}
|
||||
</div>
|
||||
)
|
||||
}
|
||||
```
|
||||
|
||||
This is especially helpful for large and static SVG nodes, which can be expensive to recreate on every render.
|
||||
|
||||
**Note:** If your project has [React Compiler](https://react.dev/learn/react-compiler) enabled, the compiler automatically hoists static JSX elements and optimizes component re-renders, making manual hoisting unnecessary.
|
||||
@ -0,0 +1,82 @@
|
||||
---
|
||||
title: Prevent Hydration Mismatch Without Flickering
|
||||
impact: MEDIUM
|
||||
impactDescription: avoids visual flicker and hydration errors
|
||||
tags: rendering, ssr, hydration, localStorage, flicker
|
||||
---
|
||||
|
||||
## Prevent Hydration Mismatch Without Flickering
|
||||
|
||||
When rendering content that depends on client-side storage (localStorage, cookies), avoid both SSR breakage and post-hydration flickering by injecting a synchronous script that updates the DOM before React hydrates.
|
||||
|
||||
**Incorrect (breaks SSR):**
|
||||
|
||||
```tsx
|
||||
function ThemeWrapper({ children }: { children: ReactNode }) {
|
||||
// localStorage is not available on server - throws error
|
||||
const theme = localStorage.getItem('theme') || 'light'
|
||||
|
||||
return (
|
||||
<div className={theme}>
|
||||
{children}
|
||||
</div>
|
||||
)
|
||||
}
|
||||
```
|
||||
|
||||
Server-side rendering will fail because `localStorage` is undefined.
|
||||
|
||||
**Incorrect (visual flickering):**
|
||||
|
||||
```tsx
|
||||
function ThemeWrapper({ children }: { children: ReactNode }) {
|
||||
const [theme, setTheme] = useState('light')
|
||||
|
||||
useEffect(() => {
|
||||
// Runs after hydration - causes visible flash
|
||||
const stored = localStorage.getItem('theme')
|
||||
if (stored) {
|
||||
setTheme(stored)
|
||||
}
|
||||
}, [])
|
||||
|
||||
return (
|
||||
<div className={theme}>
|
||||
{children}
|
||||
</div>
|
||||
)
|
||||
}
|
||||
```
|
||||
|
||||
Component first renders with default value (`light`), then updates after hydration, causing a visible flash of incorrect content.
|
||||
|
||||
**Correct (no flicker, no hydration mismatch):**
|
||||
|
||||
```tsx
|
||||
function ThemeWrapper({ children }: { children: ReactNode }) {
|
||||
return (
|
||||
<>
|
||||
<div id="theme-wrapper">
|
||||
{children}
|
||||
</div>
|
||||
<script
|
||||
dangerouslySetInnerHTML={{
|
||||
__html: `
|
||||
(function() {
|
||||
try {
|
||||
var theme = localStorage.getItem('theme') || 'light';
|
||||
var el = document.getElementById('theme-wrapper');
|
||||
if (el) el.className = theme;
|
||||
} catch (e) {}
|
||||
})();
|
||||
`,
|
||||
}}
|
||||
/>
|
||||
</>
|
||||
)
|
||||
}
|
||||
```
|
||||
|
||||
The inline script executes synchronously before showing the element, ensuring the DOM already has the correct value. No flickering, no hydration mismatch.
|
||||
|
||||
This pattern is especially useful for theme toggles, user preferences, authentication states, and any client-only data that should render immediately without flashing default values.
|
||||
@ -0,0 +1,28 @@
|
||||
---
|
||||
title: Optimize SVG Precision
|
||||
impact: LOW
|
||||
impactDescription: reduces file size
|
||||
tags: rendering, svg, optimization, svgo
|
||||
---
|
||||
|
||||
## Optimize SVG Precision
|
||||
|
||||
Reduce SVG coordinate precision to decrease file size. The optimal precision depends on the viewBox size, but in general reducing precision should be considered.
|
||||
|
||||
**Incorrect (excessive precision):**
|
||||
|
||||
```svg
|
||||
<path d="M 10.293847 20.847362 L 30.938472 40.192837" />
|
||||
```
|
||||
|
||||
**Correct (1 decimal place):**
|
||||
|
||||
```svg
|
||||
<path d="M 10.3 20.8 L 30.9 40.2" />
|
||||
```
|
||||
|
||||
**Automate with SVGO:**
|
||||
|
||||
```bash
|
||||
npx svgo --precision=1 --multipass icon.svg
|
||||
```
|
||||
@ -0,0 +1,75 @@
|
||||
---
|
||||
title: Use useTransition Over Manual Loading States
|
||||
impact: LOW
|
||||
impactDescription: reduces re-renders and improves code clarity
|
||||
tags: rendering, transitions, useTransition, loading, state
|
||||
---
|
||||
|
||||
## Use useTransition Over Manual Loading States
|
||||
|
||||
Use `useTransition` instead of manual `useState` for loading states. This provides built-in `isPending` state and automatically manages transitions.
|
||||
|
||||
**Incorrect (manual loading state):**
|
||||
|
||||
```tsx
|
||||
function SearchResults() {
|
||||
const [query, setQuery] = useState('')
|
||||
const [results, setResults] = useState([])
|
||||
const [isLoading, setIsLoading] = useState(false)
|
||||
|
||||
const handleSearch = async (value: string) => {
|
||||
setIsLoading(true)
|
||||
setQuery(value)
|
||||
const data = await fetchResults(value)
|
||||
setResults(data)
|
||||
setIsLoading(false)
|
||||
}
|
||||
|
||||
return (
|
||||
<>
|
||||
<input onChange={(e) => handleSearch(e.target.value)} />
|
||||
{isLoading && <Spinner />}
|
||||
<ResultsList results={results} />
|
||||
</>
|
||||
)
|
||||
}
|
||||
```
|
||||
|
||||
**Correct (useTransition with built-in pending state):**
|
||||
|
||||
```tsx
|
||||
import { useTransition, useState } from 'react'
|
||||
|
||||
function SearchResults() {
|
||||
const [query, setQuery] = useState('')
|
||||
const [results, setResults] = useState([])
|
||||
const [isPending, startTransition] = useTransition()
|
||||
|
||||
const handleSearch = (value: string) => {
|
||||
setQuery(value) // Update input immediately
|
||||
|
||||
startTransition(async () => {
|
||||
// Fetch and update results
|
||||
const data = await fetchResults(value)
|
||||
setResults(data)
|
||||
})
|
||||
}
|
||||
|
||||
return (
|
||||
<>
|
||||
<input onChange={(e) => handleSearch(e.target.value)} />
|
||||
{isPending && <Spinner />}
|
||||
<ResultsList results={results} />
|
||||
</>
|
||||
)
|
||||
}
|
||||
```
|
||||
|
||||
**Benefits:**
|
||||
|
||||
- **Automatic pending state**: No need to manually manage `setIsLoading(true/false)`
|
||||
- **Error resilience**: Pending state correctly resets even if the transition throws
|
||||
- **Better responsiveness**: Keeps the UI responsive during updates
|
||||
- **Interrupt handling**: New transitions automatically cancel pending ones
|
||||
|
||||
Reference: [useTransition](https://react.dev/reference/react/useTransition)
|
||||
@ -0,0 +1,39 @@
|
||||
---
|
||||
title: Defer State Reads to Usage Point
|
||||
impact: MEDIUM
|
||||
impactDescription: avoids unnecessary subscriptions
|
||||
tags: rerender, searchParams, localStorage, optimization
|
||||
---
|
||||
|
||||
## Defer State Reads to Usage Point
|
||||
|
||||
Don't subscribe to dynamic state (searchParams, localStorage) if you only read it inside callbacks.
|
||||
|
||||
**Incorrect (subscribes to all searchParams changes):**
|
||||
|
||||
```tsx
|
||||
function ShareButton({ chatId }: { chatId: string }) {
|
||||
const searchParams = useSearchParams()
|
||||
|
||||
const handleShare = () => {
|
||||
const ref = searchParams.get('ref')
|
||||
shareChat(chatId, { ref })
|
||||
}
|
||||
|
||||
return <button onClick={handleShare}>Share</button>
|
||||
}
|
||||
```
|
||||
|
||||
**Correct (reads on demand, no subscription):**
|
||||
|
||||
```tsx
|
||||
function ShareButton({ chatId }: { chatId: string }) {
|
||||
const handleShare = () => {
|
||||
const params = new URLSearchParams(window.location.search)
|
||||
const ref = params.get('ref')
|
||||
shareChat(chatId, { ref })
|
||||
}
|
||||
|
||||
return <button onClick={handleShare}>Share</button>
|
||||
}
|
||||
```
|
||||
@ -0,0 +1,45 @@
|
||||
---
|
||||
title: Narrow Effect Dependencies
|
||||
impact: LOW
|
||||
impactDescription: minimizes effect re-runs
|
||||
tags: rerender, useEffect, dependencies, optimization
|
||||
---
|
||||
|
||||
## Narrow Effect Dependencies
|
||||
|
||||
Specify primitive dependencies instead of objects to minimize effect re-runs.
|
||||
|
||||
**Incorrect (re-runs on any user field change):**
|
||||
|
||||
```tsx
|
||||
useEffect(() => {
|
||||
console.log(user.id)
|
||||
}, [user])
|
||||
```
|
||||
|
||||
**Correct (re-runs only when id changes):**
|
||||
|
||||
```tsx
|
||||
useEffect(() => {
|
||||
console.log(user.id)
|
||||
}, [user.id])
|
||||
```
|
||||
|
||||
**For derived state, compute outside effect:**
|
||||
|
||||
```tsx
|
||||
// Incorrect: runs on width=767, 766, 765...
|
||||
useEffect(() => {
|
||||
if (width < 768) {
|
||||
enableMobileMode()
|
||||
}
|
||||
}, [width])
|
||||
|
||||
// Correct: runs only on boolean transition
|
||||
const isMobile = width < 768
|
||||
useEffect(() => {
|
||||
if (isMobile) {
|
||||
enableMobileMode()
|
||||
}
|
||||
}, [isMobile])
|
||||
```
|
||||
@ -0,0 +1,29 @@
|
||||
---
|
||||
title: Subscribe to Derived State
|
||||
impact: MEDIUM
|
||||
impactDescription: reduces re-render frequency
|
||||
tags: rerender, derived-state, media-query, optimization
|
||||
---
|
||||
|
||||
## Subscribe to Derived State
|
||||
|
||||
Subscribe to derived boolean state instead of continuous values to reduce re-render frequency.
|
||||
|
||||
**Incorrect (re-renders on every pixel change):**
|
||||
|
||||
```tsx
|
||||
function Sidebar() {
|
||||
const width = useWindowWidth() // updates continuously
|
||||
const isMobile = width < 768
|
||||
return <nav className={isMobile ? 'mobile' : 'desktop'} />
|
||||
}
|
||||
```
|
||||
|
||||
**Correct (re-renders only when boolean changes):**
|
||||
|
||||
```tsx
|
||||
function Sidebar() {
|
||||
const isMobile = useMediaQuery('(max-width: 767px)')
|
||||
return <nav className={isMobile ? 'mobile' : 'desktop'} />
|
||||
}
|
||||
```
|
||||
@ -0,0 +1,74 @@
|
||||
---
|
||||
title: Use Functional setState Updates
|
||||
impact: MEDIUM
|
||||
impactDescription: prevents stale closures and unnecessary callback recreations
|
||||
tags: react, hooks, useState, useCallback, callbacks, closures
|
||||
---
|
||||
|
||||
## Use Functional setState Updates
|
||||
|
||||
When updating state based on the current state value, use the functional update form of setState instead of directly referencing the state variable. This prevents stale closures, eliminates unnecessary dependencies, and creates stable callback references.
|
||||
|
||||
**Incorrect (requires state as dependency):**
|
||||
|
||||
```tsx
|
||||
function TodoList() {
|
||||
const [items, setItems] = useState(initialItems)
|
||||
|
||||
// Callback must depend on items, recreated on every items change
|
||||
const addItems = useCallback((newItems: Item[]) => {
|
||||
setItems([...items, ...newItems])
|
||||
}, [items]) // ❌ items dependency causes recreations
|
||||
|
||||
// Risk of stale closure if dependency is forgotten
|
||||
const removeItem = useCallback((id: string) => {
|
||||
setItems(items.filter(item => item.id !== id))
|
||||
}, []) // ❌ Missing items dependency - will use stale items!
|
||||
|
||||
return <ItemsEditor items={items} onAdd={addItems} onRemove={removeItem} />
|
||||
}
|
||||
```
|
||||
|
||||
The first callback is recreated every time `items` changes, which can cause child components to re-render unnecessarily. The second callback has a stale closure bug—it will always reference the initial `items` value.
|
||||
|
||||
**Correct (stable callbacks, no stale closures):**
|
||||
|
||||
```tsx
|
||||
function TodoList() {
|
||||
const [items, setItems] = useState(initialItems)
|
||||
|
||||
// Stable callback, never recreated
|
||||
const addItems = useCallback((newItems: Item[]) => {
|
||||
setItems(curr => [...curr, ...newItems])
|
||||
}, []) // ✅ No dependencies needed
|
||||
|
||||
// Always uses latest state, no stale closure risk
|
||||
const removeItem = useCallback((id: string) => {
|
||||
setItems(curr => curr.filter(item => item.id !== id))
|
||||
}, []) // ✅ Safe and stable
|
||||
|
||||
return <ItemsEditor items={items} onAdd={addItems} onRemove={removeItem} />
|
||||
}
|
||||
```
|
||||
|
||||
**Benefits:**
|
||||
|
||||
1. **Stable callback references** - Callbacks don't need to be recreated when state changes
|
||||
2. **No stale closures** - Always operates on the latest state value
|
||||
3. **Fewer dependencies** - Simplifies dependency arrays and reduces memory leaks
|
||||
4. **Prevents bugs** - Eliminates the most common source of React closure bugs
|
||||
|
||||
**When to use functional updates:**
|
||||
|
||||
- Any setState that depends on the current state value
|
||||
- Inside useCallback/useMemo when state is needed
|
||||
- Event handlers that reference state
|
||||
- Async operations that update state
|
||||
|
||||
**When direct updates are fine:**
|
||||
|
||||
- Setting state to a static value: `setCount(0)`
|
||||
- Setting state from props/arguments only: `setName(newName)`
|
||||
- State doesn't depend on previous value
|
||||
|
||||
**Note:** If your project has [React Compiler](https://react.dev/learn/react-compiler) enabled, the compiler can automatically optimize some cases, but functional updates are still recommended for correctness and to prevent stale closure bugs.
|
||||
@ -0,0 +1,58 @@
|
||||
---
|
||||
title: Use Lazy State Initialization
|
||||
impact: MEDIUM
|
||||
impactDescription: wasted computation on every render
|
||||
tags: react, hooks, useState, performance, initialization
|
||||
---
|
||||
|
||||
## Use Lazy State Initialization
|
||||
|
||||
Pass a function to `useState` for expensive initial values. Without the function form, the initializer runs on every render even though the value is only used once.
|
||||
|
||||
**Incorrect (runs on every render):**
|
||||
|
||||
```tsx
|
||||
function FilteredList({ items }: { items: Item[] }) {
|
||||
// buildSearchIndex() runs on EVERY render, even after initialization
|
||||
const [searchIndex, setSearchIndex] = useState(buildSearchIndex(items))
|
||||
const [query, setQuery] = useState('')
|
||||
|
||||
// When query changes, buildSearchIndex runs again unnecessarily
|
||||
return <SearchResults index={searchIndex} query={query} />
|
||||
}
|
||||
|
||||
function UserProfile() {
|
||||
// JSON.parse runs on every render
|
||||
const [settings, setSettings] = useState(
|
||||
JSON.parse(localStorage.getItem('settings') || '{}')
|
||||
)
|
||||
|
||||
return <SettingsForm settings={settings} onChange={setSettings} />
|
||||
}
|
||||
```
|
||||
|
||||
**Correct (runs only once):**
|
||||
|
||||
```tsx
|
||||
function FilteredList({ items }: { items: Item[] }) {
|
||||
// buildSearchIndex() runs ONLY on initial render
|
||||
const [searchIndex, setSearchIndex] = useState(() => buildSearchIndex(items))
|
||||
const [query, setQuery] = useState('')
|
||||
|
||||
return <SearchResults index={searchIndex} query={query} />
|
||||
}
|
||||
|
||||
function UserProfile() {
|
||||
// JSON.parse runs only on initial render
|
||||
const [settings, setSettings] = useState(() => {
|
||||
const stored = localStorage.getItem('settings')
|
||||
return stored ? JSON.parse(stored) : {}
|
||||
})
|
||||
|
||||
return <SettingsForm settings={settings} onChange={setSettings} />
|
||||
}
|
||||
```
|
||||
|
||||
Use lazy initialization when computing initial values from localStorage/sessionStorage, building data structures (indexes, maps), reading from the DOM, or performing heavy transformations.
|
||||
|
||||
For simple primitives (`useState(0)`), direct references (`useState(props.value)`), or cheap literals (`useState({})`), the function form is unnecessary.
|
||||
@ -0,0 +1,38 @@
|
||||
---
|
||||
|
||||
title: Extract Default Non-primitive Parameter Value from Memoized Component to Constant
|
||||
impact: MEDIUM
|
||||
impactDescription: restores memoization by using a constant for default value
|
||||
tags: rerender, memo, optimization
|
||||
|
||||
---
|
||||
|
||||
## Extract Default Non-primitive Parameter Value from Memoized Component to Constant
|
||||
|
||||
When memoized component has a default value for some non-primitive optional parameter, such as an array, function, or object, calling the component without that parameter results in broken memoization. This is because new value instances are created on every rerender, and they do not pass strict equality comparison in `memo()`.
|
||||
|
||||
To address this issue, extract the default value into a constant.
|
||||
|
||||
**Incorrect (`onClick` has different values on every rerender):**
|
||||
|
||||
```tsx
|
||||
const UserAvatar = memo(function UserAvatar({ onClick = () => {} }: { onClick?: () => void }) {
|
||||
// ...
|
||||
})
|
||||
|
||||
// Used without optional onClick
|
||||
<UserAvatar />
|
||||
```
|
||||
|
||||
**Correct (stable default value):**
|
||||
|
||||
```tsx
|
||||
const NOOP = () => {};
|
||||
|
||||
const UserAvatar = memo(function UserAvatar({ onClick = NOOP }: { onClick?: () => void }) {
|
||||
// ...
|
||||
})
|
||||
|
||||
// Used without optional onClick
|
||||
<UserAvatar />
|
||||
```
|
||||
44
skills/vercel-react-best-practices/rules/rerender-memo.md
Normal file
44
skills/vercel-react-best-practices/rules/rerender-memo.md
Normal file
@ -0,0 +1,44 @@
|
||||
---
|
||||
title: Extract to Memoized Components
|
||||
impact: MEDIUM
|
||||
impactDescription: enables early returns
|
||||
tags: rerender, memo, useMemo, optimization
|
||||
---
|
||||
|
||||
## Extract to Memoized Components
|
||||
|
||||
Extract expensive work into memoized components to enable early returns before computation.
|
||||
|
||||
**Incorrect (computes avatar even when loading):**
|
||||
|
||||
```tsx
|
||||
function Profile({ user, loading }: Props) {
|
||||
const avatar = useMemo(() => {
|
||||
const id = computeAvatarId(user)
|
||||
return <Avatar id={id} />
|
||||
}, [user])
|
||||
|
||||
if (loading) return <Skeleton />
|
||||
return <div>{avatar}</div>
|
||||
}
|
||||
```
|
||||
|
||||
**Correct (skips computation when loading):**
|
||||
|
||||
```tsx
|
||||
const UserAvatar = memo(function UserAvatar({ user }: { user: User }) {
|
||||
const id = useMemo(() => computeAvatarId(user), [user])
|
||||
return <Avatar id={id} />
|
||||
})
|
||||
|
||||
function Profile({ user, loading }: Props) {
|
||||
if (loading) return <Skeleton />
|
||||
return (
|
||||
<div>
|
||||
<UserAvatar user={user} />
|
||||
</div>
|
||||
)
|
||||
}
|
||||
```
|
||||
|
||||
**Note:** If your project has [React Compiler](https://react.dev/learn/react-compiler) enabled, manual memoization with `memo()` and `useMemo()` is not necessary. The compiler automatically optimizes re-renders.
|
||||
@ -0,0 +1,35 @@
|
||||
---
|
||||
title: Do not wrap a simple expression with a primitive result type in useMemo
|
||||
impact: LOW-MEDIUM
|
||||
impactDescription: wasted computation on every render
|
||||
tags: rerender, useMemo, optimization
|
||||
---
|
||||
|
||||
## Do not wrap a simple expression with a primitive result type in useMemo
|
||||
|
||||
When an expression is simple (few logical or arithmetical operators) and has a primitive result type (boolean, number, string), do not wrap it in `useMemo`.
|
||||
Calling `useMemo` and comparing hook dependencies may consume more resources than the expression itself.
|
||||
|
||||
**Incorrect:**
|
||||
|
||||
```tsx
|
||||
function Header({ user, notifications }: Props) {
|
||||
const isLoading = useMemo(() => {
|
||||
return user.isLoading || notifications.isLoading
|
||||
}, [user.isLoading, notifications.isLoading])
|
||||
|
||||
if (isLoading) return <Skeleton />
|
||||
// return some markup
|
||||
}
|
||||
```
|
||||
|
||||
**Correct:**
|
||||
|
||||
```tsx
|
||||
function Header({ user, notifications }: Props) {
|
||||
const isLoading = user.isLoading || notifications.isLoading
|
||||
|
||||
if (isLoading) return <Skeleton />
|
||||
// return some markup
|
||||
}
|
||||
```
|
||||
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Reference in New Issue
Block a user