Angular9: ERROR in The target entry-point “@angular/fire/auth” has missing dependencies

Question

When I run npm run start I get the below error regarding firebase.

Tech: Angular version 9, Firebase, Firestore, Geofirestore Angular CLI.

Answer 1

TL;DR
You need two packages (@angular/fire & firebase) to properly run your app and then to use firebase/firestore.
Install them using ng add @angular/fire & npm install firebase

Explanation:

I was getting this error when I served my app.

ERROR in The target entry-point "@angular/fire" has missing dependencies:
 - firebase/app

Reason behind this error: A proper firebase angular setup needs two packages @angular/fire & firebase. I only had one of them installed using ng add @angular/fire. In order to successfully run my project, I had to install the firebase package using npm install firebase & it worked after this.