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node_modules/core-js/modules/esnext.map.update-or-insert.js

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