import type { Snapshot, SnapshotLocation, SnapshotManifest, SnapshotStorage } from "@strands-agents/sdk";
/**
 * Snapshot storage with a flat per-session layout:
 * `<baseDir>/<sessionId>/snapshot_latest.json`.
 */
export declare class FlatFileStorage implements SnapshotStorage {
    private readonly baseDir;
    constructor(baseDir: string);
    saveSnapshot(params: {
        location: SnapshotLocation;
        snapshotId: string;
        isLatest: boolean;
        snapshot: Snapshot;
    }): Promise<void>;
    loadSnapshot(params: {
        location: SnapshotLocation;
        snapshotId?: string;
    }): Promise<Snapshot | null>;
    listSnapshotIds(): Promise<string[]>;
    deleteSession(params: {
        sessionId: string;
    }): Promise<void>;
    loadManifest(): Promise<SnapshotManifest>;
    saveManifest(): Promise<void>;
    private sessionDir;
    private snapshotPath;
}