Function beginWork

docs/index.js:10092–10571

(current, workInProgress, renderLanes)

  return bailoutOnAlreadyFinishedWork(current, workInProgress, renderLanes);
}
function beginWork(current, workInProgress, renderLanes) {
  if (null !== current)
    if (current.memoizedProps !== workInProgress.pendingProps)
      didReceiveUpdate = !0;
    else {
      if (
        !checkScheduledUpdateOrContext(current, renderLanes) &&
        0 === (workInProgress.flags & 128)
      )
        return (
          (didReceiveUpdate = !1),
          attemptEarlyBailoutIfNoScheduledUpdate(
            current,
            workInProgress,
            renderLanes
          )
        );
      didReceiveUpdate = 0 !== (current.flags & 131072) ? !0 : !1;
    }
  else
    (didReceiveUpdate = !1),
      isHydrating &&
        0 !== (workInProgress.flags & 1048576) &&
        pushTreeId(workInProgress, treeForkCount, workInProgress.index);
  workInProgress.lanes = 0;
  switch (workInProgress.tag) {
    case 16:
      a: {
        current = workInProgress.pendingProps;
        var lazyComponent = workInProgress.elementType,
          init = lazyComponent._init;
        lazyComponent = init(lazyComponent._payload);
        workInProgress.type = lazyComponent;
        if ("function" === typeof lazyComponent)
          shouldConstruct(lazyComponent)
            ? ((current = resolveClassComponentProps(lazyComponent, current)),
              (workInProgress.tag = 1),
              (workInProgress = updateClassComponent(
                null,
                workInProgress,
                lazyComponent,
                current,
                renderLanes
              )))
            : ((workInProgress.tag = 0),
              (workInProgress = updateFunctionComponent(
                null,
                workInProgress,
                lazyComponent,
                current,
                renderLanes
              )));
        else {
          if (void 0 !== lazyComponent && null !== lazyComponent)
            if (
              ((init = lazyComponent.$$typeof), init === REACT_FORWARD_REF_TYPE)
            ) {
              workInProgress.tag = 11;