Component() — react Function Reference

Source Code

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.useCallback-accesses-ref-mutated-later-via-function-preserve-memoization.js lines 4–20

function Component(props) {
  const ref = useRef({inner: null});

  const onChange = useCallback(event => {
    // The ref should still be mutable here even though function deps are frozen in
    // @enablePreserveExistingMemoizationGuarantees mode
    ref.current.inner = event.target.value;
  });

  // The ref is modified later, extending its range and preventing memoization of onChange
  const reset = () => {
    ref.current.inner = null;
  };
  reset();

  return <input onChange={onChange} />;
}