Function checkForUpdate

packages/react-devtools-shared/src/inspectedElementCache.js:171–208

({
  bridge,
  element,
  refresh,
  store,
}: {
  bridge: FrontendBridge,
  element: Element,
  refresh: RefreshFunction,
  store: Store,
})

 * This method will schedule an update if updated information is returned.
 */
export function checkForUpdate({
  bridge,
  element,
  refresh,
  store,
}: {
  bridge: FrontendBridge,
  element: Element,
  refresh: RefreshFunction,
  store: Store,
}): void | Promise<void> {
  const {id} = element;
  const rendererID = store.getRendererIDForElement(id);

  if (rendererID == null) {
    return;
  }

  return inspectElementMutableSource(
    bridge,
    element,
    null,
    rendererID,
    true,
  ).then(
    ([inspectedElement, responseType]: [
      InspectedElementFrontend,
      InspectedElementResponseType,
    ]) => {
      if (responseType === 'full-data') {
        startTransition(() => {
          const [key, value] = createCacheSeed(element, inspectedElement);
          refresh(key, value);
        });
      }
    },
  );
}

function createPromiseWhichResolvesInOneSecond() {
  return new Promise(resolve => setTimeout(resolve, 1000));