react19-source-patterns
Reference for React 19 source-file migration patterns, including API changes, ref handling, and context updates.
Profile →npx skills add github/awesome-copilot --skill react19-source-patterns --agent copilot
Same command for any agent — swap --agent for claude-code, codex, cursor.
Weekly change comes from our own snapshots, not the repository page — it measures attention, not adoption.
# 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](references/api-migrations.md#legacy-context) | | String refs `this.refs.x` | → `createRef()` | [→ api-migrations.md#string-refs](references/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
- Quick Reference Table
- PropTypes Rule
- Read the Reference
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 it?
Run `npx skills add github/awesome-copilot --skill react19-source-patterns --agent claude-code` — it drops the skill into your project so the agent can pick it up. Swap the --agent value for codex, cursor or copilot if you use one of those.
Where does this skill come from?
From github/awesome-copilot, a repository with 37,432 stars. We read it straight from the repository tree rather than a submitted listing, so what you see here is what is actually published.
Is a popular skill a good skill?
Not necessarily. Stars measure attention, not adoption — a repository can trend for a week and be abandoned. That is why we show the weekly change from our own snapshots next to the total, instead of a single flattering number.