Function mountLazyComponent

docs/external/js/react-dom.development.js:17451–17542

(_current, workInProgress, elementType, updateExpirationTime, renderExpirationTime)

  }

  function mountLazyComponent(_current, workInProgress, elementType, updateExpirationTime, renderExpirationTime) {
    if (_current !== null) {
      // A lazy component only mounts if it suspended inside a non-
      // concurrent tree, in an inconsistent state. We want to treat it like
      // a new mount, even though an empty version of it already committed.
      // Disconnect the alternate pointers.
      _current.alternate = null;
      workInProgress.alternate = null; // Since this is conceptually a new fiber, schedule a Placement effect

      workInProgress.effectTag |= Placement;
    }

    var props = workInProgress.pendingProps; // We can't start a User Timing measurement with correct label yet.
    // Cancel and resume right after we know the tag.

    cancelWorkTimer(workInProgress);
    var Component = readLazyComponentType(elementType); // Store the unwrapped component in the type.

    workInProgress.type = Component;
    var resolvedTag = workInProgress.tag = resolveLazyComponentTag(Component);
    startWorkTimer(workInProgress);
    var resolvedProps = resolveDefaultProps(Component, props);
    var child;

    switch (resolvedTag) {
      case FunctionComponent:
        {
          {
            validateFunctionComponentInDev(workInProgress, Component);
            workInProgress.type = Component = resolveFunctionForHotReloading(Component);
          }

          child = updateFunctionComponent(null, workInProgress, Component, resolvedProps, renderExpirationTime);
          return child;
        }

      case ClassComponent:
        {
          {
            workInProgress.type = Component = resolveClassForHotReloading(Component);
          }

          child = updateClassComponent(null, workInProgress, Component, resolvedProps, renderExpirationTime);
          return child;
        }

      case ForwardRef:
        {
          {
            workInProgress.type = Component = resolveForwardRefForHotReloading(Component);
          }

          child = updateForwardRef(null, workInProgress, Component, resolvedProps, renderExpirationTime);
          return child;
        }

      case MemoComponent:
        {