import type { RateLimitData, RateLimitDatabaseAdapter, RateLimitStorage, RateLimitTransaction } from '../types';
export declare class DatabaseStorage implements RateLimitStorage {
    private adapter;
    private keyPrefix;
    constructor(adapter: RateLimitDatabaseAdapter, keyPrefix?: string);
    private getKey;
    get(key: string): Promise<RateLimitData | null>;
    set(key: string, data: RateLimitData, ttl?: number): Promise<boolean>;
    increment(key: string, amount?: number): Promise<number>;
    delete(key: string): Promise<boolean>;
    exists(key: string): Promise<boolean>;
    expire(key: string, ttl: number): Promise<boolean>;
    multi(): RateLimitTransaction;
}