import type { ProgressEvent, ProgressPort } from "../ports/progress.ts";
export interface EventLogProgressDeps {
    /** Clock, injectable for tests. Default Date.now. */
    now?: () => number;
    /** Minimum ms between heartbeats per stage. Default 30000. */
    throttleMs?: number;
}
export declare class EventLogProgress implements ProgressPort {
    private readonly diabloDir;
    private readonly issue;
    private readonly runId;
    private readonly path;
    private readonly now;
    private readonly throttleMs;
    /** Last written heartbeat timestamp per stage, for per-stage throttling. */
    private readonly lastHeartbeatTs;
    constructor(diabloDir: string, issue: string, runId: string, deps?: EventLogProgressDeps);
    /** Create the issue directory. Does NOT truncate — events accumulate across runs. */
    init(): Promise<void>;
    emit(event: ProgressEvent): Promise<void>;
}