I am looking for a way to extend the type of an array, ie having at least the base array elements and possibly other elements.
use case: to communicate with translations APIs, I defined a base languages array:
const languages = ['FR', 'EN'] as const;
type BaseLanguages = typeof languages;
The objective is to define some derived types, arrays which contains at least ‘FR’ and ‘EN’ and possibly other string languages.
Thanks for your help
>Solution :
Maybe the spread operator can you help you here.
const languages = ['FR', 'EN'] as const;
type BaseLanguages = [...typeof languages, ...string[]];