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Official agent skill

React19 Source Patterns

by github in github/awesome-copilot

Reference for React 19 source-file migration patterns, including API changes, ref handling, and context updates.

OfficialMITAuto-check passed

Install React19 Source Patterns

skills CLI
$ npx skills add github/awesome-copilot --skill react19-source-patterns -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install github/awesome-copilot react19-source-patterns --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/github/awesome-copilot.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/react19-source-patterns .claude/skills/react19-source-patterns && rm -rf skills-src

Use ~/.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/

Facts

Skill name
react19-source-patterns
GitHub stars
40k
Used in
1 other repo
Token cost
~489 tokens
SKILL.md length
156 words
Files
2 (incl. references)
Skills in repo
417
Repo updated
First seen
Licence
MIT

At a glance

Reference for React 19 source-file migration patterns, including API changes, ref handling, and context updates.

  • SKILL.md covers Quick Reference Table, PropTypes Rule and Read the Reference
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

React19 Source Patterns is an agent skill from github/awesome-copilot, published by the product's own GitHub organization. Reference for React 19 source-file migration patterns, including API changes, ref handling, and context updates.

Its SKILL.md is about 490 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/api-migrations.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.

Example prompts

  • “/react19-source-patterns”

What it can do on your machine

Read from SKILL.md and the folder at commit 727ff2e. 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

React19 Source Patterns loads about 489 tokens when it runs, and up to ~3.3k if it reads all its reference files. Until then it costs about 34 tokens; SKILL.md has 156 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~34
When it runs · the whole SKILL.md, loaded when a task matches
~489
With references · SKILL.md plus every file in references/, read only if the agent opens them
~3.3k

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 727ff2e, republished under its MIT licence (© github). 156 words, ~489 tokens.

Download SKILL.mdSave it as .claude/skills/react19-source-patterns/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
react19-source-patterns
description
Reference for React 19 source-file migration patterns, including API changes, ref handling, and context updates.

React 19 Source Migration Patterns

Reference for every source-file migration required for React 19.

Quick Reference Table

PatternActionReference
ReactDOM.render(...)→ createRoot().render()See references/api-migrations.md
ReactDOM.hydrate(...)→ hydrateRoot(...)See references/api-migrations.md
unmountComponentAtNode→ root.unmount()Inline fix
ReactDOM.findDOMNode→ direct refInline fix
forwardRef(...) wrapper→ ref as direct propSee references/api-migrations.md
Component.defaultProps = {}→ ES6 default paramsSee references/api-migrations.md
useRef() no arg→ useRef(null)Inline fix add null
Legacy Context→ createContext→ api-migrations.md#legacy-context
String refs this.refs.x→ createRef()→ api-migrations.md#string-refs
import React from 'react' (unused)RemoveOnly if no React. usage in file

PropTypes Rule

Do not remove .propTypes assignments. The prop-types package still works as a standalone validator. React 19 only removes the built-in runtime checking from the React package the package itself remains valid.

Add this comment above any .propTypes block:

jsx
// NOTE: React 19 no longer runs propTypes validation at runtime.
// PropTypes kept for documentation and IDE tooling only.

Read the Reference

For full before/after code for each migration, read references/api-migrations.md. It contains the complete patterns including edge cases for forwardRef with useImperativeHandle, defaultProps null vs undefined behavior, and legacy context provider/consumer cross-file migrations.

© 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 1 other file (references) in skills/react19-source-patterns of github/awesome-copilot.

  • SKILL.md
  • references/api-migrations.md

Open the folder on GitHubat commit 727ff2e

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

React19 Source 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.

React19 Source Patterns compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
React19 Source Patterns this skillgithub/awesome-copilot40k1 repos~489Automated safety check: PassMIT
Web Artifacts Builderanthropics/skills180k40 repos~769Automated safety check: PassApache-2.0
React Doctormakeplane/plane60k12 repos~657Automated safety check: PassAGPL-3.0
React Composition Patternsvercel-labs/openreview1.7k58 repos~721Automated safety check: PassMIT
React Router Developmentremix-run/react-router57k1 repos~1.5kAutomated safety check: PassMIT
Electron Multi-Process ArchitectureiOfficeAI/AionUi33k1 repos~1.8kAutomated safety check: PassApache-2.0

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Works with

Questions about React19 Source Patterns

What does React19 Source Patterns do?

Reference for React 19 source-file migration patterns, including API changes, ref handling, and context updates. React19 Source Patterns is an agent skill from github/awesome-copilot, published by the product's own GitHub organization. Reference for React 19 source-file migration patterns, including API changes, ref handling, and context updates.

How do I install React19 Source Patterns in Claude Code?

Run `npx skills add github/awesome-copilot --skill react19-source-patterns -a claude-code`. Or copy the skill folder (skills/react19-source-patterns in github/awesome-copilot) into .claude/skills/react19-source-patterns in your project. Claude Code loads it when a task matches its description.

How do I install React19 Source Patterns in Codex?

Run `npx skills add github/awesome-copilot --skill react19-source-patterns -a codex`. Or copy the skill folder (skills/react19-source-patterns in github/awesome-copilot) into .agents/skills/react19-source-patterns in your project. Codex loads it when a task matches its description.

Can I use React19 Source 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 react19-source-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/react19-source-patterns, .gemini/skills/react19-source-patterns, .github/skills/react19-source-patterns and .opencode/skills/react19-source-patterns in your project.

What does React19 Source Patterns need to run?

SKILL.md names no scripts, command-line tools or credentials: React19 Source Patterns is instructions for the agent only.

Does React19 Source 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 React19 Source 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 React19 Source Patterns use?

React19 Source 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 React19 Source Patterns use?

About 489 tokens (SKILL.md is roughly 2k 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 2.8k tokens, read only when the agent opens those files.

What are the alternatives to React19 Source Patterns?

Skills that share tags, products or a category with React19 Source Patterns: Web Artifacts Builder (anthropics/skills, 180k stars), React Doctor (makeplane/plane, 60k stars), React Composition Patterns (vercel-labs/openreview, 1.7k 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 React19 Source Patterns?

github (a GitHub organization, an official publisher) maintains it in github/awesome-copilot, which has 39,748 GitHub stars. The repository holds 417 skills in this directory. The repository was last updated on October 7, 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.