export interface Subscription {
    unsubscribe(): void;
}
export type SubscriptionHandler = (message?: string | symbol | number | boolean) => void;
export declare class EventBus<Topic extends object> {
    id: string;
    subscriptions: WeakMap<Topic, Set<SubscriptionHandler>>;
    constructor(id?: string);
    publish: (topic: Topic, message?: Parameters<SubscriptionHandler>[0]) => void;
    subscribe: (topic: Topic, handler: SubscriptionHandler) => Subscription;
}