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node_modules/core-js/modules/esnext.composite-key.js

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+'use strict';
+var $ = require('../internals/export');
+var apply = require('../internals/function-apply');
+var getCompositeKeyNode = require('../internals/composite-key');
+var getBuiltIn = require('../internals/get-built-in');
+var create = require('../internals/object-create');
+
+var $Object = Object;
+
+var initializer = function () {
+  var freeze = getBuiltIn('Object', 'freeze');
+  return freeze ? freeze(create(null)) : create(null);
+};
+
+// https://github.com/tc39/proposal-richer-keys/tree/master/compositeKey
+$({ global: true, forced: true }, {
+  compositeKey: function compositeKey() {
+    return apply(getCompositeKeyNode, $Object, arguments).get('object', initializer);
+  }
+});