The existential operator has been introduced as an ECMAScript proposal[1], so it will probably be included in future versions of JavaScript. The `idx` function

The existential operator has been introduced as an ECMAScript proposal[1], so it will probably be included in future versions of JavaScript. The `idx` function is just a temporary workaround. When it gets added to the language, we can codemod away all usage of `idx` to use the question-mark syntax. [1] https://github.com/claudepache/es-optional-chaining https://github.com/claudepache/es-optional-chaining