add a workaround of WebKit ~ iOS 10.3 Safari Promise instantiation …

…bug, close #932
zloirock · May 3, 2021 · c78f69d · c78f69d
1 parent 11f5cf6
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diff --git 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
@@ -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);