The part it doesn\'t like is the get() method in ngOnInit(). Is says, \"[ts] Property \'get\' does not exist on type \'AngularFirestoreDocument<{}>\'.\"
You're using Angular Fire, so the syntax is the following:
this.afs.collection("users").doc(this.id).valueChanges(user => { console.log(user); });
Read the documentation here: https://github.com/angular/angularfire2