Initial Save

node_modules/core-js-pure/modules/esnext.map.find-key.js

@@ -0,0 +1,18 @@
+'use strict';
+var $ = require('../internals/export');
+var bind = require('../internals/function-bind-context');
+var aMap = require('../internals/a-map');
+var iterate = require('../internals/map-iterate');
+
+// `Map.prototype.findKey` method
+// https://github.com/tc39/proposal-collection-methods
+$({ target: 'Map', proto: true, real: true, forced: true }, {
+  findKey: function findKey(callbackfn /* , thisArg */) {
+    var map = aMap(this);
+    var boundFunction = bind(callbackfn, arguments.length > 1 ? arguments[1] : undefined);
+    var result = iterate(map, function (value, key) {
+      if (boundFunction(value, key, map)) return { key: key };
+    }, true);
+    return result && result.key;
+  }
+});