Function getContainerFromFiber

docs/external/js/react-dom.development.js:3037–3039

(fiber)

    return null;
  }
  function getContainerFromFiber(fiber) {
    return fiber.tag === HostRoot ? fiber.stateNode.containerInfo : null;
  }
  function isFiberMounted(fiber) {
    return getNearestMountedFiber(fiber) === fiber;
  }