import type { IEventBus, IEventBusSubscribeOptions, TEventBusListener, TEventBusUnsubscribe } from "./types";
/**
 * Dispatches a message to every subscriber on `topic`.
 *
 * @example
 * ```ts
 * busDispatch('user-updated', { id: 1, name: 'John' });
 * ```
 */
export declare const busDispatch: <T extends IEventBus>(topic: T["topic"], message: T["message"]) => void;
/**
 * Subscribes to messages on a specific topic. Returns an unsubscribe function.
 *
 * Pass `options.onError` to handle listener exceptions (default: `console.error`).
 *
 * @example
 * ```ts
 * const unsubscribe = busSubscribe('user-updated', (msg) => {
 *   console.log(msg);
 * });
 * unsubscribe();
 *
 * // Custom error handler
 * busSubscribe('x', handler, { onError: (e) => reportBug(e) });
 * ```
 */
export declare const busSubscribe: <T extends IEventBus>(topic: T["topic"], listener: TEventBusListener<T["message"]>, options?: IEventBusSubscribeOptions) => TEventBusUnsubscribe;
/**
 * Subscribes to a topic and automatically unsubscribes after the first
 * matching dispatch.
 *
 * @example
 * ```ts
 * busOnce('ready', () => startApp());
 * ```
 */
export declare const busOnce: <T extends IEventBus>(topic: T["topic"], listener: TEventBusListener<T["message"]>, options?: IEventBusSubscribeOptions) => TEventBusUnsubscribe;