fix: only set socket if passed

src/transports/base.ts

@@ -11,8 +11,10 @@ export abstract class BasePeer implements Peer {
   constructor({ socket, uris = [] }: PeerConstructorOptions) {
     this.connectionUris = uris.map((uri) => new URL(uri.toString()));
     this.challenge = new Uint8Array();
+    if (socket) {
       this._socket = socket;
     }
+  }
 
   private _id?: NodeId;