Function beginWork

lib/assets/react-source/development/react.js:22105–22406

(current, workInProgress, renderExpirationTime)

	}

	function beginWork(current, workInProgress, renderExpirationTime) {
	  var updateExpirationTime = workInProgress.expirationTime;

	  {
	    if (workInProgress._debugNeedsRemount && current !== null) {
	      // This will restart the begin phase with a new fiber.
	      return remountFiber(current, workInProgress, createFiberFromTypeAndProps(workInProgress.type, workInProgress.key, workInProgress.pendingProps, workInProgress._debugOwner || null, workInProgress.mode, workInProgress.expirationTime));
	    }
	  }

	  if (current !== null) {
	    var oldProps = current.memoizedProps;
	    var newProps = workInProgress.pendingProps;

	    if (oldProps !== newProps || hasContextChanged() || ( // Force a re-render if the implementation changed due to hot reload:
	     workInProgress.type !== current.type )) {
	      // If props or context changed, mark the fiber as having performed work.
	      // This may be unset if the props are determined to be equal later (memo).
	      didReceiveUpdate = true;
	    } else if (updateExpirationTime < renderExpirationTime) {
	      didReceiveUpdate = false; // This fiber does not have any pending work. Bailout without entering
	      // the begin phase. There's still some bookkeeping we that needs to be done
	      // in this optimized path, mostly pushing stuff onto the stack.

	      switch (workInProgress.tag) {
	        case HostRoot:
	          pushHostRootContext(workInProgress);
	          resetHydrationState();
	          break;

	        case HostComponent:
	          pushHostContext(workInProgress);

	          if (workInProgress.mode & ConcurrentMode && renderExpirationTime !== Never && shouldDeprioritizeSubtree(workInProgress.type, newProps)) {
	            {
	              markSpawnedWork(Never);
	            } // Schedule this fiber to re-render at offscreen priority. Then bailout.


	            workInProgress.expirationTime = workInProgress.childExpirationTime = Never;
	            return null;
	          }

	          break;

	        case ClassComponent:
	          {
	            var Component = workInProgress.type;

	            if (isContextProvider(Component)) {
	              pushContextProvider(workInProgress);
	            }

	            break;
	          }

	        case HostPortal:
	          pushHostContainer(workInProgress, workInProgress.stateNode.containerInfo);