Function updateClassComponent

docs/external/js/react-dom.development.js:17192–17260

(current, workInProgress, Component, nextProps, renderExpirationTime)

  }

  function updateClassComponent(current, workInProgress, Component, nextProps, renderExpirationTime) {
    {
      if (workInProgress.type !== workInProgress.elementType) {
        // Lazy component props can't be validated in createElement
        // because they're only guaranteed to be resolved here.
        var innerPropTypes = Component.propTypes;

        if (innerPropTypes) {
          checkPropTypes_1(innerPropTypes, nextProps, // Resolved props
          'prop', getComponentName(Component), getCurrentFiberStackInDev);
        }
      }
    } // Push context providers early to prevent context stack mismatches.
    // During mounting we don't know the child context yet as the instance doesn't exist.
    // We will invalidate the child context in finishClassComponent() right after rendering.


    var hasContext;

    if (isContextProvider(Component)) {
      hasContext = true;
      pushContextProvider(workInProgress);
    } else {
      hasContext = false;
    }

    prepareToReadContext(workInProgress, renderExpirationTime);
    var instance = workInProgress.stateNode;
    var shouldUpdate;

    if (instance === null) {
      if (current !== null) {
        // A class component without an instance 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;
      } // In the initial pass we might need to construct the instance.


      constructClassInstance(workInProgress, Component, nextProps);
      mountClassInstance(workInProgress, Component, nextProps, renderExpirationTime);
      shouldUpdate = true;
    } else if (current === null) {
      // In a resume, we'll already have an instance we can reuse.
      shouldUpdate = resumeMountClassInstance(workInProgress, Component, nextProps, renderExpirationTime);
    } else {
      shouldUpdate = updateClassInstance(current, workInProgress, Component, nextProps, renderExpirationTime);
    }

    var nextUnitOfWork = finishClassComponent(current, workInProgress, Component, shouldUpdate, hasContext, renderExpirationTime);

    {
      var inst = workInProgress.stateNode;