Function updateContextConsumer

docs/external/js/react-dom.development.js:18397–18447

(current, workInProgress, renderExpirationTime)

  var hasWarnedAboutUsingContextAsConsumer = false;

  function updateContextConsumer(current, workInProgress, renderExpirationTime) {
    var context = workInProgress.type; // The logic below for Context differs depending on PROD or DEV mode. In
    // DEV mode, we create a separate object for Context.Consumer that acts
    // like a proxy to Context. This proxy object adds unnecessary code in PROD
    // so we use the old behaviour (Context.Consumer references Context) to
    // reduce size and overhead. The separate object references context via
    // a property called "_context", which also gives us the ability to check
    // in DEV mode if this property exists or not and warn if it does not.

    {
      if (context._context === undefined) {
        // This may be because it's a Context (rather than a Consumer).
        // Or it may be because it's older React where they're the same thing.
        // We only want to warn if we're sure it's a new React.
        if (context !== context.Consumer) {
          if (!hasWarnedAboutUsingContextAsConsumer) {
            hasWarnedAboutUsingContextAsConsumer = true;

            error('Rendering <Context> directly is not supported and will be removed in ' + 'a future major release. Did you mean to render <Context.Consumer> instead?');
          }
        }
      } else {
        context = context._context;
      }
    }

    var newProps = workInProgress.pendingProps;
    var render = newProps.children;

    {
      if (typeof render !== 'function') {
        error('A context consumer was rendered with multiple children, or a child ' + "that isn't a function. A context consumer expects a single child " + 'that is a function. If you did pass a function, make sure there ' + 'is no trailing or leading whitespace around it.');
      }
    }

    prepareToReadContext(workInProgress, renderExpirationTime);
    var newValue = readContext(context, newProps.unstable_observedBits);
    var newChildren;

    {
      ReactCurrentOwner$1.current = workInProgress;
      setIsRendering(true);
      newChildren = render(newValue);
      setIsRendering(false);
    } // React DevTools reads this flag.


    workInProgress.effectTag |= PerformedWork;
    reconcileChildren(current, workInProgress, newChildren, renderExpirationTime);
    return workInProgress.child;
  }

  function markWorkInProgressReceivedUpdate() {
    didReceiveUpdate = true;