LiteralList<Union>
I want to be able to define an array that contains exactly the elements of all possible values of a union once.
type Union = "prevStep" | "nextStep" | "submit" | "order";
// this works:
const list: LiteralList<Union> = ["nextStep", "order", "prevStep", "submit"];
// this fails:
const list: LiteralList<Union> = ["nextStep", "order", "prevStep", "submit", "submit"];
// this fails:
const list: LiteralList<Union> = ["nextStep", "order", "prevStep"];I already made this work with this type:
type LiteralList<T extends string, U = T> = [T] extends [never]
? []
: U extends T
? [U, ...LiteralList<Exclude<T, U>>]
: [];I'm not sure though if it makes sense since I asked ChatGPT to do it.
Is it possible to add this type helper to type-fest?
sindresorhus / type-fest
A collection of essential TypeScript types
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