/**
 * Hashes and verifies passwords using Node's built-in scrypt KDF.
 * Stored format is `${saltHex}:${hashHex}` - no external dependency required.
 */
export default class PasswordHasher {
    static hashPassword(plainPassword: string): Promise<string>;
    static verifyPassword(plainPassword: string, storedHash: string): Promise<boolean>;
    private static deriveKey;
}