const authClient = createAuthClient();
 
type ErrorTypes = Partial<
    Record<
        keyof typeof client.$ERROR_CODES,
        {
            en: string;
            es: string;
        }
    >
>;
 
const errorCodes = {
    USER_ALREADY_EXISTS: {
        en: "user already registered",
        es: "usuario ya registrada",
    },
} satisfies ErrorTypes;
 
const getErrorMessage = (code: string, lang: "en" | "es") => {
    if (code in errorCodes) {
        return errorCodes[code as keyof typeof errorCodes][lang];
    }
    return "";
};
 
 
const { error } = await authClient.signUp.email({
    email: "user@email.com",
    password: "password",
    name: "User",
});
if(error?.code){
    alert(getErrorMessage(error.code), "en");
}