From bc30ef9842a5c2719828278aa8aa2e4df9575cda Mon Sep 17 00:00:00 2001
From: Andrew Clark <acdlite@fb.com>
Date: Thu, 9 Mar 2017 15:55:07 -0800
Subject: [PATCH] Work around loose typing for fiber.updateQueue

The updateQueue field is currently an any type. Check the fiber's tag so
that only UpdateQueues are passed to getPendingPriority.
---
 src/renderers/shared/fiber/ReactFiberScheduler.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/renderers/shared/fiber/ReactFiberScheduler.js b/src/renderers/shared/fiber/ReactFiberScheduler.js
index 290efb7cab..29b74134ec 100644
--- a/src/renderers/shared/fiber/ReactFiberScheduler.js
+++ b/src/renderers/shared/fiber/ReactFiberScheduler.js
@@ -571,7 +571,13 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
     // Check for pending update priority. This is usually null so it shouldn't
     // be a perf issue.
     const queue = workInProgress.updateQueue;
-    if (queue !== null) {
+    const tag = workInProgress.tag;
+    if (
+      queue !== null &&
+      // TODO: Revisit once updateQueue is typed properly to distinguish between
+      // update payloads for host components and update queues for composites
+      (tag === ClassComponent || tag === HostRoot)
+    ) {
       newPriority = getPendingPriority(queue);
     }