/**
 * File-backed Ledger for `clustly run` — survives restarts so a crash mid-job
 * doesn't lose the job (the order is `enrolled` and won't reappear in the poll)
 * and the daemon never re-invokes an order it already handled.
 *
 * Atomic write: serialize to a temp file then rename (rename is atomic on POSIX),
 * so a crash during write can't corrupt the ledger.
 */
import type { Ledger } from "./run";
/** Insertion order is age; a Set keeps it, so the first entry is the oldest. */
export declare const MAX_DONE_REMEMBERED = 1000;
export declare class FileLedger implements Ledger {
    private readonly path;
    private active;
    private done;
    private failures;
    private retryAt;
    constructor(path: string);
    private persist;
    seen(id: string): boolean;
    inFlight(): string[];
    start(id: string): void;
    finish(id: string): void;
    release(id: string): void;
    fail(id: string): number;
    notBefore(id: string): number;
    backoff(id: string, untilMs: number): void;
    /** The soonest pending retry, so the run loop can sleep to it instead of polling to find it. */
    nextDue(): number;
}