/**
 * Verify if a given token is valid for a given secret.
 */
export declare function verify(secret: string, token: string): boolean;
export type Options = {
    saltLength?: number;
    secretLength?: number;
};
/**
 * Token generation/verification class.
 */
export default class Tokens {
    private saltLength;
    private secretLength;
    /**
     * @param [options]
     * @param [options.saltLength=8] The string length of the salt
     * @param [options.secretLength=18] The byte length of the secret key
     */
    constructor(options?: Options);
    /**
     * Create a new CSRF token.
     *
     * @param secret The secret for the token.
     */
    create(secret: string): string;
    secret(): Promise<string>;
    secret(callback: (err: unknown, str: string) => void): void;
    /**
     * Create a new secret key synchronously.
     */
    secretSync(): string;
}