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Add polyfills to support iteration of Map and Set

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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
This commit is contained in:
Jonas Jenwald 2020-02-14 13:33:53 +01:00
parent cd3f2d49e6
commit 4a76ab352c
1 changed files with 20 additions and 0 deletions
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20
src/shared/compatibility.js
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@ -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) {