From 4a76ab352cb3a2d22886f83821547817e106d9c9 Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Fri, 14 Feb 2020 13:33:53 +0100
Subject: [PATCH] Add polyfills to support iteration of `Map` and `Set`
Without this, things such as e.g. `Metadata.getAll` is broken in IE11 (see PR 11596).
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map#Browser_compatibility
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set#Browser_compatibility
---
src/shared/compatibility.js | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/src/shared/compatibility.js b/src/shared/compatibility.js
index e4634b3f3..93fee9bd1 100644
--- a/src/shared/compatibility.js
+++ b/src/shared/compatibility.js
@@ -281,6 +281,26 @@ if (
globalThis.ReadableStream = require("web-streams-polyfill/dist/ponyfill.js").ReadableStream;
})();
+ // We want to support Map iteration, but it doesn't seem possible to easily
+ // test for that specifically; hence using a similarly unsupported property.
+ // Support: IE11
+ (function checkMapEntries() {
+ if (globalThis.Map && globalThis.Map.prototype.entries) {
+ return;
+ }
+ globalThis.Map = require("core-js/es/map/index.js");
+ })();
+
+ // We want to support Set iteration, but it doesn't seem possible to easily
+ // test for that specifically; hence using a similarly unsupported property.
+ // Support: IE11
+ (function checkSetEntries() {
+ if (globalThis.Set && globalThis.Set.prototype.entries) {
+ return;
+ }
+ globalThis.Set = require("core-js/es/set/index.js");
+ })();
+
// Support: IE<11, Safari<8, Chrome<36
(function checkWeakMap() {
if (globalThis.WeakMap) {