I was using polymerfire with polymer 2.0. However, then I decided to move to polymer 3.0. I tried to use this element https://www.npmjs.com/package/polymerfire3. But it doesn't work. It kept on giving an error
Cannot read property 'signInWithPopup' of undefined at HTMLElement.signInWithPopup (firebase-auth.js:200)
Is there a way to fix this?