function completeUnitOfWork(unitOfWork) {
  var completedWork = unitOfWork;
  do {
     // ...
     next = completeWork(current, completedWork, subtreeRenderLanes);
     // ...
     if (returnFiber !== null && (returnFiber.flags & Incomplete) === NoFlags) {
       if (returnFiber.firstEffect === null) {
          returnFiber.firstEffect = completedWork.firstEffect;
        }
        if (completedWork.lastEffect !== null) {
          if (returnFiber.lastEffect !== null) {
              returnFiber.lastEffect.nextEffect = completedWork.firstEffect;
            }
            returnFiber.lastEffect = completedWork.lastEffect;
        }
        var flags = completedWork.flags;
        if (flags > PerformedWork) {
          if (returnFiber.lastEffect !== null) {
            returnFiber.lastEffect.nextEffect = completedWork;
          }else {
            returnFiber.firstEffect = completedWork;
          }
          returnFiber.lastEffect = completedWork;
        }
     }
     var siblingFiber = completedWork.sibling;
     if (siblingFiber !== null) {
        workInProgress = siblingFiber;
        return;
     }
     completedWork = returnFiber;
     workInProgress = completedWork;
  } while (completedWork !== null);
  // ...
}

function completeWork(current, workInProgress, renderLanes) {
    var newProps = workInProgress.pendingProps;
    switch (workInProgress.tag) {
      case IndeterminateComponent:
      case LazyComponent:
      case SimpleMemoComponent:
      case FunctionComponent:
      case ForwardRef:
      case Fragment:
      case Mode:
      case Profiler:
      case ContextConsumer:
      case MemoComponent:
        return null;
      case ClassComponent:
        // ...
      case HostRoot:
       // ...
        updateHostContainer(workInProgress);
        return null;
      case HostComponent:
        // ...
         var instance = createInstance(type, newProps, rootContainerInstance, currentHostContext, workInProgress);
         appendAllChildren(instance, workInProgress, false, false);
         workInProgress.stateNode = instance;
        // ...
     // ...
}

function createInstance(type, props, rootContainerInstance, hostContext, internalInstanceHandle) {
    var parentNamespace;
    {
      // TODO: take namespace into account when validating.
      var hostContextDev = hostContext;
      validateDOMNesting(type, null, hostContextDev.ancestorInfo);
      if (typeof props.children === 'string' || typeof props.children === 'number') {
        var string = '' + props.children;
        var ownAncestorInfo = updatedAncestorInfo(hostContextDev.ancestorInfo, type);
        validateDOMNesting(null, string, ownAncestorInfo);
      }
      parentNamespace = hostContextDev.namespace;
    }
    var domElement = createElement(type, props, rootContainerInstance, parentNamespace);
    precacheFiberNode(internalInstanceHandle, domElement);
    updateFiberProps(domElement, props);
    return domElement;
  }

function createElement(type, props, rootContainerElement, parentNamespace) {
  // script標(biāo)簽處理...
  // ...
  // flow相關(guān)webComponents處理
  // ...
  domElement = ownerDocument.createElement(type);
  // select標(biāo)簽特殊處理，單獨設(shè)置multiple以及size
  // 非法標(biāo)簽告警處理...
  return domElement;
}

appendAllChildren = function (parent, workInProgress, needsVisibilityToggle, isHidden) {
    var node = workInProgress.child;
      while (node !== null) {
        if (node.tag === HostComponent || node.tag === HostText) {
          appendInitialChild(parent, node.stateNode);
        } else if (node.tag === HostPortal) ; else if (node.child !== null) {
          node.child.return = node;
          node = node.child;
          continue;
        }
        if (node === workInProgress) {
          return;
        }
        while (node.sibling === null) {
          if (node.return === null || node.return === workInProgress) {
            return;
          }
          node = node.return;
        }
        node.sibling.return = node.return;
        node = node.sibling;
      }
}

function useEffect(create, deps) {
    var dispatcher = resolveDispatcher();
    return dispatcher.useEffect(create, deps);
}

function resolveDispatcher() {
    var dispatcher = ReactCurrentDispatcher.current;
    if (!(dispatcher !== null)) {
      {
        throw Error( "Invalid hook call. Hooks can only be called inside of the body of a function component. This could happen for one of the following reasons:\n1. You might have mismatching versions of React and the renderer (such as React DOM)\n2. You might be breaking the Rules of Hooks\n3. You might have more than one copy of React in the same app\nSee https://reactjs.org/link/invalid-hook-call for tips about how to debug and fix this problem." );
      }
    }
    return dispatcher;
  }

const ReactCurrentDispatcher = {
  /**
   * @internal
   * @type {ReactComponent}
   */
  current: (null: null | Dispatcher),
};

{
      readContext: function (context, observedBits) {
        return readContext(context, observedBits);
      },
      useCallback: function (callback, deps) {
        currentHookNameInDev = 'useCallback';
        mountHookTypesDev();
        checkDepsAreArrayDev(deps);
        return mountCallback(callback, deps);
      },
      useContext: function (context, observedBits) {
        currentHookNameInDev = 'useContext';
        mountHookTypesDev();
        return readContext(context, observedBits);
      },
      useEffect: function (create, deps) {
        currentHookNameInDev = 'useEffect';
        mountHookTypesDev();
        checkDepsAreArrayDev(deps);
        return mountEffect(create, deps);
      },
      useImperativeHandle: function (ref, create, deps) {
        currentHookNameInDev = 'useImperativeHandle';
        mountHookTypesDev();
        checkDepsAreArrayDev(deps);
        return mountImperativeHandle(ref, create, deps);
      },
      useLayoutEffect: function (create, deps) {
        currentHookNameInDev = 'useLayoutEffect';
        mountHookTypesDev();
        checkDepsAreArrayDev(deps);
        return mountLayoutEffect(create, deps);
      },
      useMemo: function (create, deps) {
        currentHookNameInDev = 'useMemo';
        mountHookTypesDev();
        checkDepsAreArrayDev(deps);
        var prevDispatcher = ReactCurrentDispatcher$1.current;
        ReactCurrentDispatcher$1.current = InvalidNestedHooksDispatcherOnMountInDEV;
        try {
          return mountMemo(create, deps);
        } finally {
          ReactCurrentDispatcher$1.current = prevDispatcher;
        }
      },
      useReducer: function (reducer, initialArg, init) {
        currentHookNameInDev = 'useReducer';
        mountHookTypesDev();
        var prevDispatcher = ReactCurrentDispatcher$1.current;
        ReactCurrentDispatcher$1.current = InvalidNestedHooksDispatcherOnMountInDEV;
        try {
          return mountReducer(reducer, initialArg, init);
        } finally {
          ReactCurrentDispatcher$1.current = prevDispatcher;
        }
      },
      useRef: function (initialValue) {
        currentHookNameInDev = 'useRef';
        mountHookTypesDev();
        return mountRef(initialValue);
      },
      useState: function (initialState) {
        currentHookNameInDev = 'useState';
        mountHookTypesDev();
        var prevDispatcher = ReactCurrentDispatcher$1.current;
        ReactCurrentDispatcher$1.current = InvalidNestedHooksDispatcherOnMountInDEV;
        try {
          return mountState(initialState);
        } finally {
          ReactCurrentDispatcher$1.current = prevDispatcher;
        }
      },
      useDebugValue: function (value, formatterFn) {
        currentHookNameInDev = 'useDebugValue';
        mountHookTypesDev();
        return mountDebugValue();
      },
      useDeferredValue: function (value) {
        currentHookNameInDev = 'useDeferredValue';
        mountHookTypesDev();
        return mountDeferredValue(value);
      },
      useTransition: function () {
        currentHookNameInDev = 'useTransition';
        mountHookTypesDev();
        return mountTransition();
      },
      useMutableSource: function (source, getSnapshot, subscribe) {
        currentHookNameInDev = 'useMutableSource';
        mountHookTypesDev();
        return mountMutableSource(source, getSnapshot, subscribe);
      },
      useOpaqueIdentifier: function () {
        currentHookNameInDev = 'useOpaqueIdentifier';
        mountHookTypesDev();
        return mountOpaqueIdentifier();
      },
      unstable_isNewReconciler: enableNewReconciler
    };

function mountEffect(create, deps) {
    {
      // $FlowExpectedError - jest isn't a global, and isn't recognized outside of tests
      if ('undefined' !== typeof jest) {
        warnIfNotCurrentlyActingEffectsInDEV(currentlyRenderingFiber$1);
      }
    }
    return mountEffectImpl(Update | Passive, Passive$1, create, deps);
  }

function mountEffectImpl(fiberFlags, hookFlags, create, deps) {
  var hook = mountWorkInProgressHook();
    var nextDeps = deps === undefined ? null : deps;
    currentlyRenderingFiber$1.flags |= fiberFlags;
    hook.memoizedState = pushEffect(HasEffect | hookFlags, create, undefined, nextDeps);
}

{
    memoizedState: null,
    baseState: null,
    baseQueue: null,
    queue: null,
    next: null
};

function pushEffect(tag, create, destroy, deps) {
    var effect = {
      tag: tag,
      create: create,
      destroy: destroy,
      deps: deps,
      // Circular
      next: null
    };
    var componentUpdateQueue = currentlyRenderingFiber$1.updateQueue;
    if (componentUpdateQueue === null) {
      componentUpdateQueue = createFunctionComponentUpdateQueue();
      currentlyRenderingFiber$1.updateQueue = componentUpdateQueue;
      componentUpdateQueue.lastEffect = effect.next = effect;
    } else {
      var lastEffect = componentUpdateQueue.lastEffect;
      if (lastEffect === null) {
        componentUpdateQueue.lastEffect = effect.next = effect;
      } else {
        var firstEffect = lastEffect.next;
        lastEffect.next = effect;
        effect.next = firstEffect;
        componentUpdateQueue.lastEffect = effect;
      }
    }
    return effect;
  }