declare module "sm-crypto" {
  export const sm4: {
    encrypt: (plainText: string, key: string, options?: { padding?: "pkcs#5" | "pkcs#7" | "none" }) => string;
    decrypt: (cipherText: string, key: string, options?: { padding?: "pkcs#5" | "pkcs#7" | "none" }) => string;
  };
}