How do I implement one time user authentication for my ionic app users

I have a separate file for my database configuration which is name: app.firebase.config.ts Inside my app.component.ts file I implemented this code but all I get is blank page. Any help please

Try to put SiginPage under ‘’ like this:

that.rootPage = ‘SigninPage’;

Did that but still getting blank page

Check your Inspector for debug errors in your console.

But, the only thing I can think is maybe the SigninPage isn’t the exact same
as it is inside the export class SigninPage?