--- /dev/null
+'use strict';
+// TODO: remove from `core-js@4`
+var $ = require('../internals/export');
+var IS_PURE = require('../internals/is-pure');
+var $upsert = require('../internals/map-upsert');
+
+// `Map.prototype.updateOrInsert` method (replaced by `Map.prototype.upsert`)
+// https://github.com/thumbsupep/proposal-upsert
+$({ target: 'Map', proto: true, real: true, forced: IS_PURE }, {
+ updateOrInsert: $upsert
+});