react19-source-patterns
Reference for React 19 source-file migration patterns, including API changes, ref handling, and context updates.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/github/awesome-copilot --skill react19-source-patterns- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads react19-source-patterns automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
React 19 Source Migration Patterns
Reference for every source-file migration required for React 19.
Quick Reference Table
| Pattern | Action | Reference |
|---|---|---|
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 ref | Inline fix |
forwardRef(...) wrapper | → ref as direct prop | See references/api-migrations.md |
Component.defaultProps = {} | → ES6 default params | See 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) | Remove | Only 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:
// 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.
FAQ
What does the react19-source-patterns skill do?
Reference for React 19 source-file migration patterns, including API changes, ref handling, and context updates.
How do I install react19-source-patterns?
Run npx skills add https://github.com/github/awesome-copilot --skill react19-source-patterns in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/react19-source-patterns/ (personal) or .claude/skills/react19-source-patterns/ (project).
Which AI agents can use react19-source-patterns?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is react19-source-patterns safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains react19-source-patterns?
It is published by github in github/awesome-copilot, and it is an official skill from the maker of the technology it covers. It has 968 recorded installs.
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