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node_modules/core-js/internals/map-iterate.js

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+'use strict';
+var uncurryThis = require('../internals/function-uncurry-this');
+var iterateSimple = require('../internals/iterate-simple');
+var MapHelpers = require('../internals/map-helpers');
+
+var Map = MapHelpers.Map;
+var MapPrototype = MapHelpers.proto;
+var forEach = uncurryThis(MapPrototype.forEach);
+var entries = uncurryThis(MapPrototype.entries);
+var next = entries(new Map()).next;
+
+module.exports = function (map, fn, interruptible) {
+  return interruptible ? iterateSimple({ iterator: entries(map), next: next }, function (entry) {
+    return fn(entry[1], entry[0]);
+  }) : forEach(map, fn);
+};