import { Particle } from './particle';
export declare class Subscriptions {
    private subscriptions;
    constructor();
    /**
     * Subscriptions will be applied by outside message if id will be the same.
     *
     * @param particle
     * @param ttl time to live, subscription will be deleted after this time
     */
    subscribe(particle: Particle, ttl: number): void;
    update(particle: Particle): boolean;
    get(id: string): Particle | undefined;
    hasSubscription(particle: Particle): boolean;
}
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