/**
 * Storage record mapping token strings to expiration timestamps (milliseconds)
 */
export type TokenRecord = Record<string, number>;
/**
 * First-class collection for tracking used tokens and their expirations
 * Encapsulates token reuse prevention logic
 */
export declare class UsedTokens {
    private readonly tokens;
    constructor(record?: TokenRecord);
    hasBeenUsed(token: string): boolean;
    markAsUsed(token: string, expirationSeconds: number): void;
    removeExpiredTokens(): void;
    toRecord(): TokenRecord;
}