import type { Stream } from '../stream';
import type { StateChangeTransformation } from '../types';
import { BaseTransformation } from './base-transformation';
export declare class StreamFilter<T> extends BaseTransformation<T> {
    by(filter: StateChangeTransformation<T, boolean>): Stream<T>;
    byStream(enableSignal: Stream<boolean>, args?: {
        whenDisabled?: T;
    }): Stream<T>;
    changes(args?: {
        skipInitial: boolean;
    }): Stream<T>;
    skipInitial(): Stream<T>;
    nonEmpty(): Stream<T>;
}