/**
 * EventBus — Simple typed EventEmitter wrapper for pipeline events.
 * Provides loose coupling between pipeline filters (ADR-001).
 */
import type { PipelineEvent, PipelineEventType } from '../types/index.js';
export type EventHandler = (event: PipelineEvent) => void | Promise<void>;
export declare class EventBus {
    private emitter;
    constructor();
    on(eventType: PipelineEventType, handler: EventHandler): void;
    once(eventType: PipelineEventType, handler: EventHandler): void;
    off(eventType: PipelineEventType, handler: EventHandler): void;
    emit(event: PipelineEvent): void;
    /** Subscribe to all pipeline events */
    onAny(handler: EventHandler): void;
    removeAllListeners(): void;
}
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