From db129147abc424ff17e99a093773d5662ee05943 Mon Sep 17 00:00:00 2001
From: Chris Bobbe <cbobbe@zulip.com>
Date: Mon, 24 Aug 2020 17:02:12 -0700
Subject: [PATCH] Jest setup: Stop polyfilling Promise.

It looks like this line was introduced in 3ff3987, in 2015, and it
has remained in a similar form since then. I haven't found any
explanation for it.

At facebook/jest#10221 [1], a core Jest maintainer says,

"""
As an aside, one should never replace `global.Promise` [...]. E.g.
when using `async-await` you will always get the native `Promise`
regardless of the value of `global.Promise`.
"""

facebook/jest#10221 is one issue this line has raised, for anyone
using the latest features of Jest to test async code in their React
Native projects.

[1] https://github.com/facebook/jest/issues/10221#issuecomment-654687396

Fixes: #29303
---
 jest/setup.js | 1 -
 1 file changed, 1 deletion(-)

diff --git a/jest/setup.js b/jest/setup.js
index bc27b00e23abf0..db82fc8e59fe8e 100644
--- a/jest/setup.js
+++ b/jest/setup.js
@@ -21,7 +21,6 @@ global.performance = {
   now: jest.fn(Date.now),
 };
 
-global.Promise = jest.requireActual('promise');
 global.regeneratorRuntime = jest.requireActual('regenerator-runtime/runtime');
 
 global.requestAnimationFrame = function(callback) {