export default function reduce<T>(iterable: Iterable<T>, reducer: (accumulator: T, value: T, index: number) => T): T;
export default function reduce<T>(iterable: Iterable<T>, seed: T, reducer: (accumulator: T, value: T, index: number) => T): T;
export default function reduce<T, R>(iterable: Iterable<T>, seed: R, reducer: (accumulator: R, value: T, index: number) => R): R;