import { SignalParameters } from '../types';
import type { Stream } from '../stream';
import { BaseTransformation } from './base-transformation';
export declare class StreamSignal<T> extends BaseTransformation<T> {
    private readonly parameters?;
    constructor(stream: Stream<T>, parameters?: SignalParameters | undefined);
    reset(fallbackValue?: T): Stream<T>;
    whenChanged(): Stream<boolean>;
    hysteresis<T extends number>(low: T, high: T): Stream<boolean>;
}