/**
 * Session persistence adapters.
 * StorageAdapter is the extension point; SessionManager is the developer-facing API.
 */
import type { SessionState, StorageAdapter } from "../types";
export declare class InMemoryStorage implements StorageAdapter {
    private store;
    get(sessionId: string): Promise<SessionState | null>;
    set(sessionId: string, state: SessionState): Promise<void>;
    delete(sessionId: string): Promise<void>;
}
export declare class FileStorage implements StorageAdapter {
    private readonly dir;
    constructor(dir: string);
    private filePath;
    get(sessionId: string): Promise<SessionState | null>;
    set(sessionId: string, state: SessionState): Promise<void>;
    delete(sessionId: string): Promise<void>;
}
/**
 * SQLite session store using Node's built-in `node:sqlite` (Node 22.5+).
 * No native addon required.
 */
export declare class SqliteStorage implements StorageAdapter {
    private db;
    constructor(dbPath?: string);
    get(sessionId: string): Promise<SessionState | null>;
    set(sessionId: string, state: SessionState): Promise<void>;
    delete(sessionId: string): Promise<void>;
    close(): void;
}
/** Optional Redis adapter — works with any client exposing get/set/del. */
export declare class RedisStorage implements StorageAdapter {
    private readonly client;
    private readonly keyPrefix;
    constructor(client: {
        get(key: string): Promise<string | null>;
        set(key: string, value: string): Promise<unknown>;
        del(key: string): Promise<unknown>;
    }, keyPrefix?: string);
    private key;
    get(sessionId: string): Promise<SessionState | null>;
    set(sessionId: string, state: SessionState): Promise<void>;
    delete(sessionId: string): Promise<void>;
}
export declare class SessionManager {
    private readonly storage;
    constructor(storage: StorageAdapter);
    load(sessionId: string): Promise<SessionState>;
    save(state: SessionState): Promise<void>;
    clear(sessionId: string): Promise<void>;
}
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