randomMDN🦖 Array.prototype[Symbol.unscopables] 🦖
The [Symbol.unscopables] data property of Array.prototype is shared by all Array instances. It contains property names that were not included in the ECMAScript standard prior to the ES2015 version and that are ignored for with statement-binding purposes.
Array.prototype[Symbol.unscopables] - JavaScript | MDN
The [Symbol.unscopables] data property of Array.prototype is shared by all Array instances. It contains property names that were not included in the ECMAScript standard prior to the ES2015 version and that are ignored for with statement-binding purposes.