Function commitDeletion

packages/react-reconciler/src/commitWork.ts:364–398

(childToDelete: FiberNode, root: FiberRootNode)

}

function commitDeletion(childToDelete: FiberNode, root: FiberRootNode) {
	const rootChildrenToDelete: FiberNode[] = [];

	// 递归子树
	commitNestedComponent(childToDelete, (unmountFiber) => {
		switch (unmountFiber.tag) {
			case HostComponent:
				recordHostChildrenToDelete(rootChildrenToDelete, unmountFiber);
				safelyDetachRef(unmountFiber);
				return;
			case HostText:
				recordHostChildrenToDelete(rootChildrenToDelete, unmountFiber);
				return;
			case FunctionComponent:
				commitPassiveEffect(unmountFiber, root, 'unmount');
				return;
			default:
				if (__DEV__) {
					console.warn('未处理的unmount类型', unmountFiber);
				}
		}
	});

	// 移除rootHostComponent的DOM
	if (rootChildrenToDelete.length) {
		const hostParent = getHostParent(childToDelete);
		if (hostParent !== null) {
			rootChildrenToDelete.forEach((node) => {
				removeChild(node.stateNode, hostParent);
			});
		}
	}
	childToDelete.return = null;
	childToDelete.child = null;
}

function commitNestedComponent(
	root: FiberNode,