Function updateClassComponent

lib/assets/react-source/development/react.js:20752–20820

(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(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;