1 files changed, 26 insertions, 0 deletions
diff --git a/node_modules/core-js/modules/esnext.map.map-keys.js b/node_modules/core-js/modules/esnext.map.map-keys.js
new file mode 100644
index 0000000..430e5fe
--- /dev/null
+++ b/node_modules/core-js/modules/esnext.map.map-keys.js
@@ -0,0 +1,26 @@
+'use strict';
+var $ = require('../internals/export');
+var IS_PURE = require('../internals/is-pure');
+var getBuiltIn = require('../internals/get-built-in');
+var anObject = require('../internals/an-object');
+var aFunction = require('../internals/a-function');
+var bind = require('../internals/function-bind-context');
+var speciesConstructor = require('../internals/species-constructor');
+var getMapIterator = require('../internals/get-map-iterator');
+var iterate = require('../internals/iterate');
+
+// `Map.prototype.mapKeys` method
+// https://github.com/tc39/proposal-collection-methods
+$({ target: 'Map', proto: true, real: true, forced: IS_PURE }, {
+  mapKeys: function mapKeys(callbackfn /* , thisArg */) {
+    var map = anObject(this);
+    var iterator = getMapIterator(map);
+    var boundFunction = bind(callbackfn, arguments.length > 1 ? arguments[1] : undefined, 3);
+    var newMap = new (speciesConstructor(map, getBuiltIn('Map')))();
+    var setter = aFunction(newMap.set);
+    iterate(iterator, function (key, value) {
+      setter.call(newMap, boundFunction(value, key, map), value);
+    }, { AS_ENTRIES: true, IS_ITERATOR: true });
+    return newMap;
+  }
+});