How to determine if the user signed in to Firebase with email and password or with google sign in?

Question

I am working on a log in for a web application, and I have made it so the user can sign in manually with their email and password or by using a google sign in. Is there a way to

Answer 1

Currently @mjdnk asnwer depracated, because it will gives always first provider not the last logged in.

So most recent solution is:

As noted here

var uiConfig = {
        callbacks: {
          signInSuccessWithAuthResult: function(authResult, redirectUrl) {
            var providerId = authResult.additionalUserInfo.providerId;
            localStorage.setItem("firebaseProviderId", providerId)
            //...
          },
          //..
       }

and for display in page

firebase.auth().onAuthStateChanged(function (user) {
      if (user) {
        user.getIdToken().then(function (idToken) {

          $('#user').text(welcomeName + "(" + localStorage.getItem("firebaseProviderId")+ ")");
          $('#logged-in').show();
        }
    }
});