Cannot find name 'RTCDataChannel'

Ionic Framework ionic-v3
1

[12:29:59] typescript: C:/Users/ASUS/Desktop/project/node_modules/peerjs/index.d.ts, line: 168
Cannot find name ‘RTCDataChannel’.

 L167:  open: boolean;
 L168:  peerConnection: RTCPeerConnection;
 L169:  peer: string;