PaginateInterface & ComposePaginateInterface - code duplication issue

[ptomulik]

I've seen this comment and I came across the following idea.

interface Overloads {
    0: (t1: number) => number;
    1: (t1: number, t2: number) => number;
}

interface Generate<Prepend extends []|[string]> {
    (...args: [...Prepend, ...Parameters<Overloads[0]>]): ReturnType<Overloads[0]>;
    (...args: [...Prepend, ...Parameters<Overloads[1]>]): ReturnType<Overloads[1]>;
}

type Normal = Generate<[]>; // Generate Overloads
type Prepended = Generate<[string]>; // Generate Overloads with leading argument of type string

const normal: Normal = (t1: number, t2?: number) => {
    return t1 + (t2 === undefined ? 0 : t2);
}

const prepended: Prepended = (s: string, t1: number, t2?: number) => {
    console.log(s);
    return t1 + (t2 === undefined ? 0 : t2);
}

console.log(normal(1));
console.log(normal(1, 2));
console.log(prepended("one", 1));
console.log(prepended("two plus three", 2, 3));

Technically this approach could do the job, but there are three problems - argument names get lost, doc-strings get lost and the final interfaces/types become completely unreadable :).