From 682bbd0e7212df0bfe1d8017284e2822d281f7ea Mon Sep 17 00:00:00 2001
From: Ricky <rickhanlonii@gmail.com>
Date: Thu, 15 Jul 2021 12:39:56 -0400
Subject: [PATCH] Cache local reference to global Promise (#21886)

---
 packages/react-dom/src/client/ReactDOMHostConfig.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/packages/react-dom/src/client/ReactDOMHostConfig.js b/packages/react-dom/src/client/ReactDOMHostConfig.js
index bad70b6ba9..43f5077932 100644
--- a/packages/react-dom/src/client/ReactDOMHostConfig.js
+++ b/packages/react-dom/src/client/ReactDOMHostConfig.js
@@ -392,6 +392,7 @@ export const scheduleTimeout: any =
 export const cancelTimeout: any =
   typeof clearTimeout === 'function' ? clearTimeout : (undefined: any);
 export const noTimeout = -1;
+const localPromise = Promise;
 
 // -------------------
 //     Microtasks
@@ -400,9 +401,10 @@ export const supportsMicrotasks = true;
 export const scheduleMicrotask: any =
   typeof queueMicrotask === 'function'
     ? queueMicrotask
-    : typeof Promise !== 'undefined'
+    : typeof localPromise !== 'undefined'
     ? callback =>
-        Promise.resolve(null)
+        localPromise
+          .resolve(null)
           .then(callback)
           .catch(handleErrorInNextTick)
     : scheduleTimeout; // TODO: Determine the best fallback here.