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Add polyfills to support iteration of Map and Set #11598

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merged 1 commit into from
Feb 14, 2020
Merged

Add polyfills to support iteration of Map and Set #11598

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20 changes: 20 additions & 0 deletions src/shared/compatibility.js
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Original file line number Diff line number Diff line change
Expand Up @@ -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) {
Expand Down