import type { EventMeta } from "./types.js";
type Handler = (payload: unknown, meta: EventMeta) => void | Promise<void>;
type AnyEventHandler = (event: string, payload: unknown, meta: EventMeta) => void | Promise<void>;
export declare function subscribe(event: string, handler: Handler): string;
/**
 * Subscribe to every emitted event. For a subscriber whose interest is stored
 * data it should not read until an event actually arrives.
 */
export declare function subscribeAll(handler: AnyEventHandler): string;
export declare function unsubscribe(id: string): boolean;
export declare function emit(event: string, payload: unknown, meta?: Partial<EventMeta>): void;
/** Emit an event and wait until every subscriber has accepted it. */
export declare function emitAsync(event: string, payload: unknown, meta?: Partial<EventMeta>): Promise<void>;
export declare function listSubscriptions(event?: string): {
    id: string;
    event: string;
}[];
export declare function __resetEventBus(): void;
export {};