Component() — react Function Reference

Source Code

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/typed-identity-function-frozen-input.js lines 12–28

function Component({a, b}) {
  // create a mutable value with input `a`
  const x = useMemo(() => makeObject_Primitives(a), [a]);

  // freeze the value
  useIdentity(x);

  // known to pass-through via aliasing signature
  const x2 = typedIdentity(x);

  // Unknown function so we assume it conditionally mutates,
  // but x2 is frozen so this downgrades to a read.
  // x should *not* take b as a dependency
  identity(x2, b);

  return <ValidateMemoization inputs={[a]} output={x} />;
}