Function commitHook

packages/react-reconciler/src/ReactTestSelectors.js:578–592

()

  // When React mutates the host environment, we may need to change what we're listening to.
  const commitHook = () => {
    const nextInstanceRoots = findAllNodes(hostRoot, selectors);

    instanceRoots.forEach(target => {
      if (nextInstanceRoots.indexOf(target) < 0) {
        unobserve(target);
      }
    });

    nextInstanceRoots.forEach(target => {
      if (instanceRoots.indexOf(target) < 0) {
        observe(target);
      }
    });
  };

  commitHooks.push(commitHook);