Function WarnOnUpdate

packages/react-devtools-shell/src/app/InlineWarnings/index.js:21–31

({children = null})

// $FlowFixMe[missing-local-annot]
function WarnOnUpdate({children = null}) {
  const didMountRef = useRef(false);
  useEffect(() => {
    if (didMountRef.current) {
      console.warn('This warning fires on every update');
    } else {
      didMountRef.current = true;
    }
  });
  return children;
}

// $FlowFixMe[missing-local-annot]
function WarnOnUnmount({children = null}) {