Function getMaskedContext

lib/assets/react-source/development/react.js:14410–14447

(workInProgress, unmaskedContext)

	}

	function getMaskedContext(workInProgress, unmaskedContext) {
	  {
	    var type = workInProgress.type;
	    var contextTypes = type.contextTypes;

	    if (!contextTypes) {
	      return emptyContextObject;
	    } // Avoid recreating masked context unless unmasked context has changed.
	    // Failing to do this will result in unnecessary calls to componentWillReceiveProps.
	    // This may trigger infinite loops if componentWillReceiveProps calls setState.


	    var instance = workInProgress.stateNode;

	    if (instance && instance.__reactInternalMemoizedUnmaskedChildContext === unmaskedContext) {
	      return instance.__reactInternalMemoizedMaskedChildContext;
	    }

	    var context = {};

	    for (var key in contextTypes) {
	      context[key] = unmaskedContext[key];
	    }

	    {
	      var name = getComponentName(type) || 'Unknown';
	      checkPropTypes(contextTypes, context, 'context', name, getCurrentFiberStackInDev);
	    } // Cache unmasked context so we can avoid recreating masked context unless necessary.
	    // Context is created before the class component is instantiated so check for instance.


	    if (instance) {
	      cacheContext(workInProgress, unmaskedContext, context);
	    }

	    return context;
	  }
	}

	function hasContextChanged() {
	  {