Function invalidateContextProvider

code/redux/public/app.js:12697–12719

(workInProgress, didChange)

  }

  function invalidateContextProvider(workInProgress, didChange) {
    var instance = workInProgress.stateNode;
    !instance ? invariant(false, 'Expected to have an instance by this point. This error is likely caused by a bug in React. Please file an issue.') : void 0;

    if (didChange) {
      // Merge parent and own context.
      // Skip this if we're not updating due to sCU.
      // This avoids unnecessarily recomputing memoized values.
      var mergedContext = processChildContext(workInProgress, previousContext);
      instance.__reactInternalMemoizedMergedChildContext = mergedContext;

      // Replace the old (or empty) context with the new one.
      // It is important to unwind the context in the reverse order.
      pop(didPerformWorkStackCursor, workInProgress);
      pop(contextStackCursor, workInProgress);
      // Now push the new context and mark that it has changed.
      push(contextStackCursor, mergedContext, workInProgress);
      push(didPerformWorkStackCursor, didChange, workInProgress);
    } else {
      pop(didPerformWorkStackCursor, workInProgress);
      push(didPerformWorkStackCursor, didChange, workInProgress);
    }
  }

  function findCurrentUnmaskedContext(fiber) {
    // Currently this is only used with renderSubtreeIntoContainer; not sure if it