/**
 * Outbox — append-only JSONL queue of pending sync operations.
 *
 * Every governance mutation (create pipeline, promote gate, submit evidence,
 * etc.) is recorded here when performed offline. The sync engine reads
 * pending entries and replays them against the ForgeOS engine API.
 *
 * File: `.forgeos/outbox.jsonl`
 *
 * Uses JSONL append for writes (no full rewrite). Read operations parse
 * the entire file — acceptable because the outbox is pruned regularly.
 *
 * Uses only Node.js built-ins (fs, path, crypto). No external dependencies.
 */
import type { OutboxEntry } from "./types.js";
export declare class Outbox {
    private filePath;
    constructor(projectRoot: string);
    /**
     * Append a new outbox entry. Auto-generates id, timestamp, and sets
     * synced=false, retries=0.
     *
     * @returns The complete OutboxEntry with generated fields.
     */
    append(entry: Omit<OutboxEntry, "id" | "timestamp" | "synced" | "retries">): OutboxEntry;
    /** Return all entries that have not been successfully synced. */
    getPending(): OutboxEntry[];
    /**
     * Mark an entry as successfully synced. Rewrites the file with the
     * updated entry.
     */
    markSynced(id: string): void;
    /**
     * Mark an entry as failed. Increments the retry counter and records
     * the error message. Rewrites the file with the updated entry.
     */
    markFailed(id: string, error: string): void;
    /** Return aggregate statistics about the outbox. */
    getStats(): {
        total: number;
        pending: number;
        synced: number;
        failed: number;
    };
    /**
     * Remove synced entries older than the given number of days.
     * Defaults to 7 days. Returns the number of entries removed.
     */
    prune(olderThanDays?: number): number;
    /** Read all entries from the JSONL file. */
    private readAll;
    /** Rewrite the entire outbox file with the given entries. */
    private writeAll;
    /** Update a single entry by ID, then rewrite the file. */
    private updateEntry;
    /** Ensure the parent directory of the outbox file exists. */
    private ensureDir;
}
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