Function getMaskedContext

docs/external/js/react-dom.development.js:10838–10875

(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_1(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() {
    {