First commit

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

@@ -0,0 +1,16 @@
+'use strict';
+var $ = require('../internals/export');
+var IS_PURE = require('../internals/is-pure');
+var anObject = require('../internals/an-object');
+var getMapIterator = require('../internals/get-map-iterator');
+var iterate = require('../internals/iterate');
+
+// `Map.prototype.keyOf` method
+// https://github.com/tc39/proposal-collection-methods
+$({ target: 'Map', proto: true, real: true, forced: IS_PURE }, {
+  keyOf: function keyOf(searchElement) {
+    return iterate(getMapIterator(anObject(this)), function (key, value, stop) {
+      if (value === searchElement) return stop(key);
+    }, { AS_ENTRIES: true, IS_ITERATOR: true, INTERRUPTED: true }).result;
+  }
+});