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node_modules/core-js/internals/shared-store.js

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+'use strict';
+var global = require('../internals/global');
+var defineGlobalProperty = require('../internals/define-global-property');
+
+var SHARED = '__core-js_shared__';
+var store = global[SHARED] || defineGlobalProperty(SHARED, {});
+
+module.exports = store;