Function unwindUnitOfWork

packages/react-reconciler/src/workLoop.ts:464–486

(unitOfWork: FiberNode)

}

function unwindUnitOfWork(unitOfWork: FiberNode) {
	let incompleteWork: FiberNode | null = unitOfWork;
	do {
		const next = unwindWork(incompleteWork);

		if (next !== null) {
			next.flags &= HostEffectMask;
			workInProgress = next;
			return;
		}

		const returnFiber = incompleteWork.return as FiberNode;
		if (returnFiber !== null) {
			returnFiber.deletions = null;
		}
		incompleteWork = returnFiber;
		// workInProgress = incompleteWork;
	} while (incompleteWork !== null);

	// 没有 边界 中止unwind流程，一直到root
	workInProgress = null;
	workInProgressRootExitStatus = RootDidNotComplete;
}