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

@@ -0,0 +1,9 @@
+'use strict';
+var shared = require('../internals/shared');
+var uid = require('../internals/uid');
+
+var keys = shared('keys');
+
+module.exports = function (key) {
+  return keys[key] || (keys[key] = uid(key));
+};