Getting "undefined" from error.email when trying to link multiple auth providers in firebase

Question

I'm trying to link multiple auth providers to one account using firebase. The user is trying to create an account with the same address as the Google OAuth account which is already on firebase.

firebase
.auth()
.createUserWithEmailAndPassword(email, password)
.then(async result => {
    if (result.additionalUserInfo.isNewUser) {
        firebase
            .database()
            .ref('/users/' + result.user.uid)
            .set({
                email: email,
                profile_picture: image,
                first_name: firstName,
                last_name: lastName,
                created_at: Date.now()
            })
            .then(snapshot => console.log("do something"))
    } else {
        firebase
            .database()
            .ref('/users/' + result.user.uid)
            .update({
                last_logged_in: Date.now()
            })
            .then(snapshot => console.log("do something"))
    }
})
.catch(error => {
    if (error.code === 'auth/email-already-in-use' || error.code === 'auth/credential-already-in-use' || error.code === 'auth/account-exists-with-different-credential') {
        const pendingCred = error.credential
        const email = error.email
        firebase
            .auth()
            .fetchSignInMethodsForEmail(email)
            .then(methods => {
                switch (methods[0]) {
                    case 'password':
                        // email and password logic
                        break;
                    case 'facebook.com':
                        // facebook logic
                        break;
                    default:
                        break;
                }
            })
        return;
    }
})

The problem is I'm getting the proper error message:

[Error: The email address is already in use by another account.]

and the proper error.code:

auth/email-already-in-use

but, pendingCred or error.email come back undefined.

Update
I took the advise and tried the following:

firebase.auth()
    .EmailAuthProvider
    .credential(email, password)
    .then(result => console.log("result", result))
    .catch(error => console.log(error))

I'm getting the error:

[TypeError: undefined is not an object (evaluating '_firebase.default.auth().EmailAuthProvider.credential')]

Answer 1

The email was in error.customData.email for me.