import type { EventBus } from './event-bus.js';
export interface EventLoggerOptions {
    /** Override for testing; production default is 1024. */
    bufferSize?: number;
    /** Override log directory; production default is <agent-server>/logs/events. */
    logDir?: string;
}
export interface EventLogger {
    /** Flush all buffered entries to disk. Called automatically by bus.close(). */
    close(): Promise<void>;
}
export declare function createEventLogger(bus: EventBus, opts?: EventLoggerOptions): EventLogger;