import type { SessionEvent } from "./types.js";
export type EventSink = (event: SessionEvent) => void | Promise<void>;
/**
 * Per-session event recorder. Three concerns:
 *   1. In-memory buffer (returned in SessionResult so callers can replay).
 *   2. Optional NDJSON file writer for durable replay (orchestrator session log).
 *   3. Optional callback fanout — the web app passes a callback that pushes
 *      to SSE / R2 in production.
 *
 * Errors writing the file are swallowed; we never want a log-write failure
 * to abort an in-flight orchestrator session.
 */
export declare class SessionLog {
    private readonly opts;
    private readonly buffer;
    private fileInitialized;
    constructor(opts?: {
        ndjsonPath?: string;
        onEvent?: EventSink;
    });
    emit(event: SessionEvent): Promise<void>;
    events(): SessionEvent[];
}
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