| 'use strict'; | 
| // TODO: Remove from `core-js@4` | 
| var $ = require('../internals/export'); | 
| var $group = require('../internals/array-group'); | 
| var arrayMethodIsStrict = require('../internals/array-method-is-strict'); | 
| var addToUnscopables = require('../internals/add-to-unscopables'); | 
|   | 
| // `Array.prototype.groupBy` method | 
| // https://github.com/tc39/proposal-array-grouping | 
| // https://bugs.webkit.org/show_bug.cgi?id=236541 | 
| $({ target: 'Array', proto: true, forced: !arrayMethodIsStrict('groupBy') }, { | 
|   groupBy: function groupBy(callbackfn /* , thisArg */) { | 
|     var thisArg = arguments.length > 1 ? arguments[1] : undefined; | 
|     return $group(this, callbackfn, thisArg); | 
|   } | 
| }); | 
|   | 
| addToUnscopables('groupBy'); |