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node_modules/core-js/internals/freezing.js

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+'use strict';
+var fails = require('../internals/fails');
+
+module.exports = !fails(function () {
+  // eslint-disable-next-line es/no-object-isextensible, es/no-object-preventextensions -- required for testing
+  return Object.isExtensible(Object.preventExtensions({}));
+});