import { Option } from '../../option';
export declare const singleton: <A>(x: A) => Iterator<A, any, undefined>;
export declare const pure: <A>(x: A) => Iterator<A, any, undefined>;
export declare const empty: Iterator<never>;
export declare const of: <A>(...xs: A[]) => Iterator<A, any, undefined>;
export declare const lift: <A>(next: () => IteratorResult<A, any>) => Iterator<A, any, undefined>;
export declare const range: (from: number, to?: number) => Iterator<number>;
export declare const unfoldRight: <A, B>(z: B, f: (b: B) => Option<[A, B]>) => Iterator<A, any, undefined>;
export declare const fromArray: <A>(xs: A[]) => Iterator<A, any, undefined>;
export declare const fromArrayReversed: <A>(xs: A[]) => Iterator<A, any, undefined>;
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