/**
 * IEventBus — Per-container event bus interface (ADR-12).
 *
 * Design decisions:
 * - `on()` returns an unsubscribe function (not `off()` with handler reference)
 * - Per-container, not global singleton — supports multi-session/multi-agent
 * - Interface does not prescribe sync/async — implementations choose
 * - Wildcard '*' subscribes to all event types
 */
import type { DomainEvent, DomainEventType } from './types.js';
/** Handler function for domain events */
export type EventHandler<T extends DomainEvent = DomainEvent> = (event: T) => void;
/** Unsubscribe function returned by `on()` */
export type Unsubscribe = () => void;
export interface IEventBus {
    /**
     * Subscribe to events of a specific type, or '*' for all events.
     * Returns an unsubscribe function.
     */
    on<T extends DomainEvent>(type: DomainEventType | '*', handler: EventHandler<T>): Unsubscribe;
    /** Emit an event to all matching subscribers */
    emit(event: DomainEvent): void;
    /** Remove all subscribers (cleanup on container disposal) */
    removeAllListeners(): void;
}
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