Function findFiberRootForHostRoot

packages/react-reconciler/src/ReactTestSelectors.js:120–143

(hostRoot: Instance)

}

function findFiberRootForHostRoot(hostRoot: Instance): Fiber {
  const maybeFiber = getInstanceFromNode((hostRoot: any));
  if (maybeFiber != null) {
    if (typeof maybeFiber.memoizedProps['data-testname'] !== 'string') {
      throw new Error(
        'Invalid host root specified. Should be either a React container or a node with a testname attribute.',
      );
    }

    return ((maybeFiber: any): Fiber);
  } else {
    const fiberRoot = findFiberRoot(hostRoot);

    if (fiberRoot === null) {
      throw new Error(
        'Could not find React container within specified host subtree.',
      );
    }

    // The Flow type for FiberRoot is a little funky.
    // createFiberRoot() cheats this by treating the root as :any and adding stateNode lazily.
    return ((fiberRoot: any).stateNode.current: Fiber);
  }
}

function matchSelector(fiber: Fiber, selector: Selector): boolean {
  const tag = fiber.tag;