useFoo() — react Function Reference

Source Code

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/bug-type-inference-control-flow.ts lines 20–33

function useFoo({cond, value}: {cond: boolean; value: number}) {
  const x = {value: cond ? CONST_NUMBER0 : []};
  mutate(x);

  const xValue = x.value;
  let result;
  if (typeof xValue === 'number') {
    result = xValue + 1; //               (1) here we infer xValue is a primitive
  } else {
    result = arrayPush(xValue, value); // (2) and propagate it to all other xValue references
  }

  return result;
}