/// <reference types="node" />
import stream from 'stream';
import { Function0, TT, TT$ } from '@upradata/util';
import { ConcatOptionsType } from '../concat';
import { Stream } from '../types';
export declare type ConditionSync<Data> = boolean | ((data: Data, callback?: (err: Error, condition: boolean) => void) => void | boolean);
export declare type Condition<Data> = TT$<boolean | ((data: Data, callback?: (err: Error, condition: boolean) => void) => void | TT$<boolean>)>;
export declare type ConditionActionSync = Stream | Function0<Stream>;
export declare type ConditionAction = TT$<Stream | Function0<TT$<Stream>>>;
export declare type ConditionActionsSync = TT<ConditionActionSync>;
export declare type ConditionActions<ConcatMode extends Mode> = ConcatMode extends 'concat' ? ConcatOptionsType : TT<ConditionAction>;
export declare type Mode = 'pipe' | 'concat';
export declare type SyncMode = 'sync' | 'async';
export declare class IfOptions<Data, ConcatMode extends Mode> {
    condition: Condition<Data>;
    true: ConditionActions<ConcatMode>;
    false?: ConditionActions<ConcatMode>;
    stream?: stream.DuplexOptions;
    mode?: Mode;
    sync?: SyncMode;
    constructor(options?: IfOptions<Data, ConcatMode>);
}
export declare const getActionStreamsAsync: (conditionActions: ConditionActions<'pipe'>) => Promise<Stream[]>;
export declare const getActionStreamsSync: (conditionActions: ConditionActionsSync) => Stream[];