I'm using it from react-static. Importing it like so
let WebRtcPeer
if (typeof window !== 'undefined') {
WebRtcPeer = require('kurento-utils').WebRtcPeer
}
Maybe "import" does work too, but now on my side, since the release build is resolving window relatively late (after all imports)
Then you seem to have a typo and IMHO new is not required either. This works:
this.webRtcPeer = WebRtcPeer.WebRtcPeerSendrecv(options, (error, stream) => {
...