What are 'Const Type Parameters' and when should they be used?

They allow a generic to infer literal and readonly types automatically without the user providing 'as const'.

In TS 5.0+, adding const to a type parameter ensures that the values passed to it are inferred as their most specific literal forms. This is vital for functions that need to know the exact keys of an object or members of an array passed by the user[cite: 1].