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anthropics/skills
Builds multi-component claude.ai HTML artifacts as a small React, TypeScript and Tailwind project, then bundles it into one shareable HTML file.
Provides exact before/after migration patterns for the three unsafe class component lifecycle methods - componentWillMount, componentWillReceiveProps, and componentWillUpdate - targeting React 18.3.1.
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Install React18 Lifecycle Patterns
$ npx skills add github/awesome-copilot --skill react18-lifecycle-patterns -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install github/awesome-copilot react18-lifecycle-patterns --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/github/awesome-copilot.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/react18-lifecycle-patterns .claude/skills/react18-lifecycle-patterns && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "react18-lifecycle-patterns" agent skill from https://github.com/github/awesome-copilot/tree/main/skills/react18-lifecycle-patterns into .claude/skills/react18-lifecycle-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "react18-lifecycle-patterns", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/github/awesome-copilot/tree/main/skills/react18-lifecycle-patternsType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add github/awesome-copilot --skill react18-lifecycle-patterns -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install github/awesome-copilot react18-lifecycle-patterns --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/github/awesome-copilot.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/react18-lifecycle-patterns .agents/skills/react18-lifecycle-patterns && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "react18-lifecycle-patterns" agent skill from https://github.com/github/awesome-copilot/tree/main/skills/react18-lifecycle-patterns into .agents/skills/react18-lifecycle-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "react18-lifecycle-patterns", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add github/awesome-copilot --skill react18-lifecycle-patterns -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install github/awesome-copilot react18-lifecycle-patterns --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/github/awesome-copilot.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/react18-lifecycle-patterns .cursor/skills/react18-lifecycle-patterns && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "react18-lifecycle-patterns" agent skill from https://github.com/github/awesome-copilot/tree/main/skills/react18-lifecycle-patterns into .cursor/skills/react18-lifecycle-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "react18-lifecycle-patterns", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/github/awesome-copilot.git --path skills/react18-lifecycle-patterns--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add github/awesome-copilot --skill react18-lifecycle-patterns -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install github/awesome-copilot react18-lifecycle-patterns --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/github/awesome-copilot.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/react18-lifecycle-patterns .gemini/skills/react18-lifecycle-patterns && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "react18-lifecycle-patterns" agent skill from https://github.com/github/awesome-copilot/tree/main/skills/react18-lifecycle-patterns into .gemini/skills/react18-lifecycle-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "react18-lifecycle-patterns", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install github/awesome-copilot react18-lifecycle-patternsInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add github/awesome-copilot --skill react18-lifecycle-patterns -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/github/awesome-copilot.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/react18-lifecycle-patterns .github/skills/react18-lifecycle-patterns && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "react18-lifecycle-patterns" agent skill from https://github.com/github/awesome-copilot/tree/main/skills/react18-lifecycle-patterns into .github/skills/react18-lifecycle-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "react18-lifecycle-patterns", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add github/awesome-copilot --skill react18-lifecycle-patterns -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install github/awesome-copilot react18-lifecycle-patterns --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/github/awesome-copilot.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/react18-lifecycle-patterns .opencode/skills/react18-lifecycle-patterns && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "react18-lifecycle-patterns" agent skill from https://github.com/github/awesome-copilot/tree/main/skills/react18-lifecycle-patterns into .opencode/skills/react18-lifecycle-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "react18-lifecycle-patterns", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
react18-lifecycle-patterns- GitHub stars
- 40k
- Used in
- 1 other repo
- Token cost
- ~910 tokens
- SKILL.md length
- 272 words
- Files
- 4 (incl. references)
- Skills in repo
- 417
- Repo updated
- First seen
- Licence
- MIT
At a glance
Provides exact before/after migration patterns for the three unsafe class component lifecycle methods - componentWillMount, componentWillReceiveProps, and componentWillUpdate - targeting React 18.3.1.
- A class component needs its lifecycle methods migrated
- SKILL.md covers Quick Decision Guide, The UNSAFE_ Prefix Rule and Reference Files
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Deciding between getDerivedStateFromProps vs componentDidUpdate
What it does
React18 Lifecycle Patterns is an agent skill from github/awesome-copilot, published by the product's own GitHub organization. Provides exact before/after migration patterns for the three unsafe class component lifecycle methods - componentWillMount, componentWillReceiveProps, and componentWillUpdate - targeting React 18.3.1. Use this skill whenever a class component needs its lifecycle methods migrated, when deciding between getDerivedStateFromProps vs componentDidUpdate, when adding getSnapshotBeforeUpdate, or when fixing React 18 UNSAFE lifecycle warnings. Always use this skill before writing any lifecycle migration code - do not…
Its SKILL.md is about 910 tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including reference files (for example `references/componentWillMount.md`, `references/componentWillReceiveProps.md` and `references/componentWillUpdate.md`).
It works with React. The repository describes itself as: Community-contributed instructions, agents, skills, and configurations to help you make the most of GitHub Copilot. The licence is MIT.
When your agent uses it
- A class component needs its lifecycle methods migrated
- Deciding between getDerivedStateFromProps vs componentDidUpdate
- Adding getSnapshotBeforeUpdate
- Fixing React 18 UNSAFE lifecycle warnings
Example prompts
- “Use the react18-lifecycle-patterns skill to provide exact before/after migration patterns for the three unsafe class component lifecycle methods -…”
- “/react18-lifecycle-patterns”
What it can do on your machine
Read from SKILL.md and the folder at commit 82701c2. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are javascript).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
React18 Lifecycle Patterns loads about 910 tokens when it runs, and up to ~4.3k if it reads all its reference files. Until then it costs about 160 tokens; SKILL.md has 272 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from github/awesome-copilot at commit 82701c2, republished under its MIT licence (© github). 272 words, ~910 tokens.
Download SKILL.mdSave it as
.claude/skills/react18-lifecycle-patterns/SKILL.md (or your agent's skills folder). This skill also uses 3 other files; get the full folder from GitHub.- name
- react18-lifecycle-patterns
- description
- Provides exact before/after migration patterns for the three unsafe class component lifecycle methods - componentWillMount, componentWillReceiveProps, and componentWillUpdate - targeting React 18.3.1. Use this skill whenever a class component needs its lifecycle methods migrated, when deciding between getDerivedStateFromProps vs componentDidUpdate, when adding getSnapshotBeforeUpdate, or when fixing React 18 UNSAFE_ lifecycle warnings. Always use this skill before writing any lifecycle migration code - do not guess the pattern from memory, the decision trees here prevent the most common migration mistakes.
React 18 Lifecycle Patterns
Reference for migrating the three unsafe class component lifecycle methods to React 18.3.1 compliant patterns.
Quick Decision Guide
Before migrating any lifecycle method, identify the semantic category of what the method does. Wrong category = wrong migration. The table below routes you to the correct reference file.
componentWillMount - what does it do?
| What it does | Correct migration | Reference |
|---|---|---|
Sets initial state (this.setState(...)) | Move to constructor | → componentWillMount.md |
| Runs a side effect (fetch, subscription, DOM) | Move to componentDidMount | → componentWillMount.md |
| Derives initial state from props | Move to constructor with props | → componentWillMount.md |
componentWillReceiveProps - what does it do?
| What it does | Correct migration | Reference |
|---|---|---|
| Async side effect triggered by prop change (fetch, cancel) | componentDidUpdate | → componentWillReceiveProps.md |
| Pure state derivation from new props (no side effects) | getDerivedStateFromProps | → componentWillReceiveProps.md |
componentWillUpdate - what does it do?
| What it does | Correct migration | Reference |
|---|---|---|
| Reads the DOM before update (scroll, size, position) | getSnapshotBeforeUpdate | → componentWillUpdate.md |
| Cancels requests / runs effects before update | componentDidUpdate with prev comparison | → componentWillUpdate.md |
The UNSAFE_ Prefix Rule
Never use UNSAFE_componentWillMount, UNSAFE_componentWillReceiveProps, or UNSAFE_componentWillUpdate as a permanent fix.
Prefixing suppresses the React 18.3.1 warning but does NOT:
- Fix concurrent mode safety issues
- Prepare the codebase for React 19 (where these are removed, with or without the prefix)
- Fix the underlying semantic problem the migration is meant to address
The UNSAFE_ prefix is only appropriate as a temporary hold while scheduling the real migration sprint. Mark any UNSAFE_ prefix additions with:
// TODO: React 19 will remove this. Migrate before React 19 upgrade.
// UNSAFE_ prefix added temporarily - replace with componentDidMount / getDerivedStateFromProps / etc.Reference Files
Read the full reference file for the lifecycle method you are migrating:
references/componentWillMount.md- 3 cases with full before/after codereferences/componentWillReceiveProps.md- getDerivedStateFromProps trap warnings, full examplesreferences/componentWillUpdate.md- getSnapshotBeforeUpdate + componentDidUpdate pairing
Read the relevant file before writing any migration code.
© github, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 3 other files (references) in skills/react18-lifecycle-patterns of github/awesome-copilot.
- SKILL.md
- references/componentWillMount.md
- references/componentWillReceiveProps.md
- references/componentWillUpdate.md
Open the folder on GitHubat commit 82701c2
Used in 1 other repository
We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in github/awesome-copilot, which our catalogue first saw on October 7, 2026.
Compare with similar skills
React18 Lifecycle Patterns next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| React18 Lifecycle Patterns this skillgithub/awesome-copilot | 40k | 1 repos | ~910 | Automated safety check: Pass | MIT | |
| Web Artifacts Builderanthropics/skills | 180k | 41 repos | ~769 | Automated safety check: Pass | Apache-2.0 | |
| Vercel Composition Patternssupabase/supabase | 111k | 58 repos | ~726 | Automated safety check: Pass | MIT | |
| React Doctormakeplane/plane | 61k | 12 repos | ~657 | Automated safety check: Pass | AGPL-3.0 | |
| React Router Developmentremix-run/react-router | 57k | 1 repos | ~1.5k | Automated safety check: Pass | MIT | |
| React UI State PatternsChrisWiles/claude-code-showcase | 6.1k | 8 repos | ~1.6k | Automated safety check: Pass | None |
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Questions about React18 Lifecycle Patterns
What does React18 Lifecycle Patterns do?
Provides exact before/after migration patterns for the three unsafe class component lifecycle methods - componentWillMount, componentWillReceiveProps, and componentWillUpdate - targeting React 18.3.1. React18 Lifecycle Patterns is an agent skill from github/awesome-copilot, published by the product's own GitHub organization.1.
When should I use React18 Lifecycle Patterns?
React18 Lifecycle Patterns fits situations like: A class component needs its lifecycle methods migrated; deciding between getDerivedStateFromProps vs componentDidUpdate; adding getSnapshotBeforeUpdate; fixing React 18 UNSAFE lifecycle warnings.
How do I install React18 Lifecycle Patterns in Claude Code?
Run `npx skills add github/awesome-copilot --skill react18-lifecycle-patterns -a claude-code`. Or copy the skill folder (skills/react18-lifecycle-patterns in github/awesome-copilot) into .claude/skills/react18-lifecycle-patterns in your project. Claude Code loads it when a task matches its description.
How do I install React18 Lifecycle Patterns in Codex?
Run `npx skills add github/awesome-copilot --skill react18-lifecycle-patterns -a codex`. Or copy the skill folder (skills/react18-lifecycle-patterns in github/awesome-copilot) into .agents/skills/react18-lifecycle-patterns in your project. Codex loads it when a task matches its description.
Can I use React18 Lifecycle Patterns in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add github/awesome-copilot --skill react18-lifecycle-patterns -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/react18-lifecycle-patterns, .gemini/skills/react18-lifecycle-patterns, .github/skills/react18-lifecycle-patterns and .opencode/skills/react18-lifecycle-patterns in your project.
What does React18 Lifecycle Patterns need to run?
SKILL.md names no scripts, command-line tools or credentials: React18 Lifecycle Patterns is instructions for the agent only.
Does React18 Lifecycle Patterns access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is React18 Lifecycle Patterns safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does React18 Lifecycle Patterns use?
React18 Lifecycle Patterns is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does React18 Lifecycle Patterns use?
About 910 tokens (SKILL.md is roughly 3.6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 3.4k tokens, read only when the agent opens those files.
What are the alternatives to React18 Lifecycle Patterns?
Skills that share tags, products or a category with React18 Lifecycle Patterns: Web Artifacts Builder (anthropics/skills, 180k stars), Vercel Composition Patterns (supabase/supabase, 111k stars), React Doctor (makeplane/plane, 61k stars) and React Router Development (remix-run/react-router, 57k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains React18 Lifecycle Patterns?
github (a GitHub organization, an official publisher) maintains it in github/awesome-copilot, which has 39,830 GitHub stars. The repository holds 417 skills in this directory. The repository was last updated on October 9, 2026.
Source: github/awesome-copilot on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.