import type { Stream } from '../stream';
import type { Subscriber } from '../stream';
export declare class BaseTransformation<T> {
    protected stream: Stream<T>;
    private afterOperations;
    constructor(stream: Stream<T>);
    createStream<T>(): Stream<T>;
    onUnique(): this;
    onInitialSkipped(): this;
    thenUnique(): this;
    thenReset(fallbackValue?: T): this;
    protected applyAfterOperations<U>(stream: Stream<U>): Stream<U>;
    protected subscribe(subscriber: Subscriber<T>): Stream<T>;
    protected isCallback<T>(source: any): source is T;
}