Initial project import

node_modules/core-js/modules/es.weak-map.get-or-insert.js

@@ -0,0 +1,18 @@
+'use strict';
+var $ = require('../internals/export');
+var WeakMapHelpers = require('../internals/weak-map-helpers');
+var IS_PURE = require('../internals/is-pure');
+
+var get = WeakMapHelpers.get;
+var has = WeakMapHelpers.has;
+var set = WeakMapHelpers.set;
+
+// `WeakMap.prototype.getOrInsert` method
+// https://tc39.es/ecma262/#sec-weakmap.prototype.getorinsert
+$({ target: 'WeakMap', proto: true, real: true, forced: IS_PURE }, {
+  getOrInsert: function getOrInsert(key, value) {
+    if (has(this, key)) return get(this, key);
+    set(this, key, value);
+    return value;
+  }
+});