Function updateClassComponent

docs/index.js:9194–9454

(
  current,
  workInProgress,
  Component,
  nextProps,
  renderLanes
)

  return workInProgress.child;
}
function updateClassComponent(
  current,
  workInProgress,
  Component,
  nextProps,
  renderLanes
) {
  prepareToReadContext(workInProgress);
  if (null === workInProgress.stateNode) {
    var context = emptyContextObject,
      contextType = Component.contextType;
    "object" === typeof contextType &&
      null !== contextType &&
      (context = readContext(contextType));
    context = new Component(nextProps, context);
    workInProgress.memoizedState =
      null !== context.state && void 0 !== context.state ? context.state : null;
    context.updater = classComponentUpdater;
    workInProgress.stateNode = context;
    context._reactInternals = workInProgress;
    context = workInProgress.stateNode;
    context.props = nextProps;
    context.state = workInProgress.memoizedState;
    context.refs = {};
    initializeUpdateQueue(workInProgress);
    contextType = Component.contextType;
    context.context =
      "object" === typeof contextType && null !== contextType
        ? readContext(contextType)
        : emptyContextObject;
    context.state = workInProgress.memoizedState;
    contextType = Component.getDerivedStateFromProps;
    "function" === typeof contextType &&
      (applyDerivedStateFromProps(
        workInProgress,
        Component,
        contextType,
        nextProps
      ),
      (context.state = workInProgress.memoizedState));
    "function" === typeof Component.getDerivedStateFromProps ||
      "function" === typeof context.getSnapshotBeforeUpdate ||
      ("function" !== typeof context.UNSAFE_componentWillMount &&
        "function" !== typeof context.componentWillMount) ||
      ((contextType = context.state),
      "function" === typeof context.componentWillMount &&
        context.componentWillMount(),
      "function" === typeof context.UNSAFE_componentWillMount &&
        context.UNSAFE_componentWillMount(),
      contextType !== context.state &&
        classComponentUpdater.enqueueReplaceState(context, context.state, null),
      processUpdateQueue(workInProgress, nextProps, context, renderLanes),
      suspendIfUpdateReadFromEntangledAsyncAction(),
      (context.state = workInProgress.memoizedState));
    "function" === typeof context.componentDidMount &&
      (workInProgress.flags |= 4194308);
    nextProps = !0;
  } else if (null === current) {