How to get serverTimestamp via Angularfire or firebase

I can't find a way to get serverTimestamp from firestore. Either with firestore itself, or with angularfire.

I found a lot of github issues with solutions, which doesn't work. I guess that's because of a different version?

"@firebase/app": "^0.1.10",
"angularfire2": "^5.0.0-rc.6.0",
"firebase": "^4.13.1",


Code alternatives I've tried:

import * as firebase from 'firebase';
firebase.firestore.FieldValue.serverTimestamp();

ERROR TypeError: Cannot read property 'FieldValue' of undefined
​

import * as firebase from 'firebase';
firebase.database.ServerValue.TIMESTAMP;

ERROR TypeError: Cannot read property 'ServerValue' of undefined
​

constructor( private afs: AngularFirestore ) { }
this.afs.firestore.FieldValue.serverTimestamp();

Property 'FieldValue' does not exist on type 'FirebaseFirestore'.
​

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