/**
 * Storage interface for token invalidation
 */
export type UserId = string;
export type Token = string;
export type Expiration = number;
export type UsedTokens = {
    [token: Token]: Expiration;
};
export interface TokenStorage {
    set(key: UserId, value: UsedTokens): Promise<void>;
    get(key: UserId): Promise<UsedTokens | undefined>;
    delete(key: UserId): Promise<boolean>;
}
/**
 * Simple in-memory token storage implementation
 * Uses Map for token storage with async interface
 */
export declare class MemoryStorage implements TokenStorage {
    private tokens;
    constructor();
    set(key: UserId, value: UsedTokens): Promise<void>;
    get(key: UserId): Promise<UsedTokens | undefined>;
    delete(key: UserId): Promise<boolean>;
}