Firebase Cookbook

How to do it...

Let's suppose we have the user profile settings page, with a section for linking those accounts. Now, we will need to do the following:

1.  Create a provider object for each supported authentication method as shown in the following code block: 

      let facebookProvider = new         firebase.</span>auth.FacebookAuthProvider();      let twitterProvider  = new       firebase.auth.TwitterAuthProvider();      let googleProvider = new       firebase.auth.GoogleAuthProvider();

2.  Use the Firebase authentication API call, using the linkWithPopup() function and the provider of our choice, as shown in the following code:

      auth.currentUser.linkWithPopup(<wanted-                                     Provider>).then(function(result) {        //TODO: Handle success response.      }).catch(function(error) {       //TODO: ...