Authentication broke after bump to v10 from v9

Anyone that has any suggestions on what might have caused this?

I get the following error when trying to sign in or sign up.:

"Cannot use 'in' operator to search for 'auth.signUp' in undefined"

"Cannot use 'in' operator to search for 'auth.signUp' in undefined"

"Cannot use 'in' operator to search for 'auth.signUp' in undefined"

"Cannot use 'in' operator to search for 'auth.signUp' in undefined"

Do I need to replace this with something new?