export type EventHandler = (payload: any) => void | Promise<void>;
/**
 * Lightweight publish/subscribe event bus for inter-service communication.
 * Replaces direct ad-hoc calls between services (e.g. notification hook
 * bolted onto every hook handler).
 *
 * Handlers are fire-and-forget — errors are caught and logged, never propagated.
 */
export declare class EventBus {
    private handlers;
    /** Subscribe to an event. Returns an unsubscribe function. */
    on(event: string, handler: EventHandler): () => void;
    /** Unsubscribe a handler from an event. */
    off(event: string, handler: EventHandler): void;
    /** Emit an event to all subscribers. Handlers run sequentially. Errors are caught. */
    emit(event: string, payload?: any): Promise<void>;
    /** Remove all handlers for a specific event (or all events if no arg). */
    clear(event?: string): void;
}
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