Manipulate Firestore Data in TypeScript

Total noob question, and I’m hoping it’s a simple answer. I’m using the angularfire2 library to connect to a Firestore database. I’m able to subscribe to a field and display it using a ngModel. I’m looking for a way to get the data and manipulate it in TypeScript. So far everything I’ve tried has just gotten me the document pointer but not the data itself. Can anyone point me in the right direction? Any help is greatly appreciated.

Some tutorials sources for Firebase and Firestore: https://javebratt.com and https://angularfirebase.com