import { Operator } from './types';
export declare function map<A, B>(f: (a: A) => B): Operator<A, B>;
export declare function scan<A, B>(f: (accumulator: B, current: A) => B, start?: B): Operator<A, B>;
export declare function debug<A>(msg: string | ((a: A) => void)): Operator<A, A>;