import { SessionStore } from '@fastify/session';
import { Session } from 'fastify';
export declare class FileStore implements SessionStore {
    directory: string;
    constructor(directory: string);
    sessionFile(sessionId: string): string;
    set(sessionId: string, session: Session, callback: (error?: any) => void): void;
    get(sessionId: string, callback: (error: any, session?: Session | null) => void): void;
    destroy(sessionId: string, callback: (error?: any) => void): void;
}