CamelCase<string> is of type 'never' ?

[GMartigny]

I might be misusing the CamelCase type, but I have an error "TS2322: Type 'string' is not assignable to type 'never'." with that very simple toCamelCase function.

import { CamelCase } from 'type-fest';

function toCamelCase (string: string): CamelCase<string> {
    return string.replace(/_(.)/g, (_, $1) => $1.toUpperCase());
}

Playground Link

What's wrong here ?

[sindresorhus]

You need to use generics: Playground Link

[GMartigny]

Thanks a lot ! 🙇‍♂️