Description

React 19.2 adds two built-ins that Biome should understand:

Summary

React 19.2 introduces two new built-ins that Biome should support:

• The new built-in hook useEffectEvent has a stable, ref-like return value that must not be added to dependency arrays (should be treated like useRef).
• The new built-in component <Activity /> should be added to the list of known React API elements.

Why

• Align Biome’s useExhaustiveDependencies rule with React 19.2 semantics so developers don’t get false positives when using Effect Events.
• Keep Biome’s React API list up to date by recognising new built-ins introduced in React releases.

Proposed changes

• In use_exhaustive_dependencies.rs, treat useEffectEvent like useRef:

  • Calls to useEffectEvent should be recognised as producing a stable, ref-like value that is never added to dependency arrays.
  • Example:

    const onConnected = useEffectEvent(() => { ... });
    useEffect(() => { ... }, []); // should not warn about missing `onConnected`

  • Update the test suite by adding representative cases to valid.js (no missing dep warning for Effect Events) and missingDependenciesInvalid.jsx (ensure adding an Effect Event is flagged as unnecessary).

• In react.rs, add:

  • useEffectEvent to the known React Hooks list.
  • Activity to the known React Components list.
  • Example:

    import { Activity } from "react";
    <Activity />; // should be recognised as a React API element