Merge branch '21-listening-event-promise-or-callback' into fix-server-close

Author: zefir-git

src/Server.ts

@@ -236,6 +236,8 @@ namespace Server {
 
         /**
          * An uncaught error occurred. Client has been sent {@link ServerErrorRegistry.ErrorCodes.INTERNAL} error.
+         * If no listener is registered when the server begins listening for the first time, a default listener will be
+         * added to direct errors to stderr.
          */
         error: [Error];
     }