export interface PostProcessEffect {
    readonly isActive: boolean;
    readonly filter: PIXI.Filter;
    update(passedTime: number): void;
}
/**
 * Manager for post process effects.
 */
export declare class PostProcessEffects {
    private readonly _effects;
    get activeFilters(): PIXI.Filter[];
    constructor();
    update(timePassed: number): void;
    addEffect(effect: PostProcessEffect): void;
}