FirebaseRTC

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the sample code

roomRef.onSnapshot(async snapshot -> {
    console.log('Got updated room:', snapshot.data());
    const data = snapshot.data();
    if (!peerConnection.currentRemoteDescription && data.answer) {
        console.log('Set remote description: ', data.answer);
        const answer = new RTCSessionDescription(data.answer)
        await peerConnection.setRemoteDescription(answer);
    }
});

should use => instead of ->

on this page: https://webrtc.org/getting-started/firebase-rtc-codelab

another bug on sample code

  const roomRef = await db.collection('rooms').add(roomWithOffer);
  const roomId = roomRef.id;

Need to turn const roomId into a global variable roomId Otherwise, in the state of no callee, the caller execution hangup will not delete the room on firestore, because the roomId is null.