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node_modules/core-js/internals/descriptors.js

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+'use strict';
+var fails = require('../internals/fails');
+
+// Detect IE8's incomplete defineProperty implementation
+module.exports = !fails(function () {
+  // eslint-disable-next-line es/no-object-defineproperty -- required for testing
+  return Object.defineProperty({}, 1, { get: function () { return 7; } })[1] !== 7;
+});