Function finishClassComponent

code/event-handlers/public/app.js:9221–9281

(current, workInProgress, shouldUpdate, hasContext, didCaptureError, renderExpirationTime)

  }

  function finishClassComponent(current, workInProgress, shouldUpdate, hasContext, didCaptureError, renderExpirationTime) {
    // Refs should update even if shouldComponentUpdate returns false
    markRef(current, workInProgress);

    if (!shouldUpdate && !didCaptureError) {
      // Context providers should defer to sCU for rendering
      if (hasContext) {
        invalidateContextProvider(workInProgress, false);
      }

      return bailoutOnAlreadyFinishedWork(current, workInProgress);
    }

    var ctor = workInProgress.type;
    var instance = workInProgress.stateNode;

    // Rerender
    ReactCurrentOwner.current = workInProgress;
    var nextChildren = void 0;
    if (didCaptureError && (!enableGetDerivedStateFromCatch || typeof ctor.getDerivedStateFromCatch !== 'function')) {
      // If we captured an error, but getDerivedStateFrom catch is not defined,
      // unmount all the children. componentDidCatch will schedule an update to
      // re-render a fallback. This is temporary until we migrate everyone to
      // the new API.
      // TODO: Warn in a future release.
      nextChildren = null;
    } else {
      {
        ReactDebugCurrentFiber.setCurrentPhase('render');
        nextChildren = instance.render();
        if (debugRenderPhaseSideEffects || debugRenderPhaseSideEffectsForStrictMode && workInProgress.mode & StrictMode) {
          instance.render();
        }
        ReactDebugCurrentFiber.setCurrentPhase(null);
      }
    }

    // React DevTools reads this flag.
    workInProgress.effectTag |= PerformedWork;
    if (didCaptureError) {
      // If we're recovering from an error, reconcile twice: first to delete
      // all the existing children.
      reconcileChildrenAtExpirationTime(current, workInProgress, null, renderExpirationTime);
      workInProgress.child = null;
      // Now we can continue reconciling like normal. This has the effect of
      // remounting all children regardless of whether their their
      // identity matches.
    }
    reconcileChildrenAtExpirationTime(current, workInProgress, nextChildren, renderExpirationTime);
    // Memoize props and state using the values we just used to render.
    // TODO: Restructure so we never read values from the instance.
    memoizeState(workInProgress, instance.state);
    memoizeProps(workInProgress, instance.props);

    // The context might have changed so we need to recalculate it.
    if (hasContext) {
      invalidateContextProvider(workInProgress, true);
    }