From c78f69d921600bfb6caf14b592d8370487d88274 Mon Sep 17 00:00:00 2001
From: Denis Pushkarev <zloirock@zloirock.ru>
Date: Mon, 3 May 2021 11:51:09 +0300
Subject: [PATCH] add a workaround of WebKit ~ iOS 10.3 Safari `Promise`
 instantiation bug, close #932

---
 CHANGELOG.md                            | 2 +-
 packages/core-js/internals/microtask.js | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4565068f0691..8132be5344cc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 ## Changelog
 ##### Unreleased
-- Nothing
+- Added a workaround of WebKit ~ iOS 10.3 Safari `Promise` instantiation bug, [#932](https://github.com/zloirock/core-js/issues/932)
 
 ##### 3.11.1 - 2021.04.28
 - Made `instanceof Promise` and `.constructor === Promise` work with polyfilled `Promise` for all native promise-based APIs
diff --git a/packages/core-js/internals/microtask.js b/packages/core-js/internals/microtask.js
index b7c1e6ef4eda..6c3a51fdb474 100644
--- a/packages/core-js/internals/microtask.js
+++ b/packages/core-js/internals/microtask.js
@@ -47,6 +47,8 @@ if (!queueMicrotask) {
   } else if (Promise && Promise.resolve) {
     // Promise.resolve without an argument throws an error in LG WebOS 2
     promise = Promise.resolve(undefined);
+    // workaround of WebKit ~ iOS Safari 10.1 bug
+    promise.constructor = Promise;
     then = promise.then;
     notify = function () {
       then.call(promise, flush);