export { groupBy, repeat };
export type { Tuple };
type Tuple<L extends number, T = unknown, R extends unknown[] = []> = number extends L ? T[] : R['length'] extends L ? R : Tuple<L, T, [T, ...R]>;
declare const groupBy: <A, B extends string>(self: Iterable<A>, f: (a: A) => B) => { [K in B]?: A[] | undefined; };
declare const repeat: <L extends number>(length: L) => <A>(a: A) => Tuple<L, A, []>;