How to handle email already exist

    const handleSignup = async () => {
        if (
            name.length < 1 ||
            email.length < 1 ||
            password.length < 1 ||
            repeatPassword.length < 1
        ) {
            setError('All fields are required');
        } else if (!isEmailValid(email)) {
            setError('Invalid Email Address')
        } else if (password !== repeatPassword) {
            setError('Passwords do not match');
        } else {
            const { data, error } = await supabase.auth.signUp({
                email: email,
                password: password,
                options: {
                    data: {
                        fullname: name,
                    },
                },
            })
            setIsLoading(true)
            if (error) {
                setError(error?.message)
                console.error('Signup Error: ', error?.message)
            } else {
                navigation.navigate('Code', {
                    email_address: email,
                });
                console.log('Signup: ', data)
            }
            setIsLoading(false)
        }
    }