import { Fn } from '../Fn';
import { HandleNever, IfInvoking, Input } from '../utils';
export interface Join<Separator extends string = never> extends Fn<string[], string> {
    out: IfInvoking<this, JoinRaw<Input<this>, Separator>, string>;
}
export type JoinRaw<A extends string[], Separator extends string = never> = [
    Separator
] extends [never] ? Internal<A, '', ''> : A extends [infer First extends string, ...infer Rest extends string[]] ? Internal<Rest, Separator, HandleNever<First, A[0]>> : '';
type Internal<A extends string[], Separator extends string, Acc extends string> = A extends [infer First extends string, ...infer Rest extends string[]] ? Internal<Rest, Separator, `${Acc}${Separator}${HandleNever<First, A[0]>}`> : Acc;
export {};