Function getUnmaskedContext

code/new-context-api/public/app.js:11657–11667

(workInProgress)

  var previousContext = emptyObject;

  function getUnmaskedContext(workInProgress) {
    var hasOwnContext = isContextProvider(workInProgress);
    if (hasOwnContext) {
      // If the fiber is a context provider itself, when we read its context
      // we have already pushed its own child context on the stack. A context
      // provider should not "see" its own child context. Therefore we read the
      // previous (parent) context instead for a context provider.
      return previousContext;
    }
    return contextStackCursor.current;
  }

  function cacheContext(workInProgress, unmaskedContext, maskedContext) {
    var instance = workInProgress.stateNode;