import type { ISink, ITime } from '../types.js';
export declare abstract class PipeSink<I, O = I> implements ISink<I> {
    readonly sink: ISink<O>;
    constructor(sink: ISink<O>);
    abstract event(time: ITime, value: I): void;
    error(time: ITime, e: unknown): void;
    end(time: ITime): void;
}
export interface IndexedValue<A> {
    readonly index: number;
    readonly value: A;
    readonly ended: boolean;
}
export declare class IndexSink<A> implements ISink<A> {
    readonly sink: ISink<IndexedValue<A | undefined>>;
    index: number;
    ended: boolean;
    value: A | undefined;
    constructor(sink: ISink<IndexedValue<A | undefined>>, index: number);
    event(time: ITime, x: A): void;
    end(time: ITime): void;
    error(time: ITime, error: unknown): void;
}