function onListening() {
  if (process.env.NODE_ENV === 'development' || process.env.NODE_ENV === 'production') {
    console.log("Server is listening on http://localhost:".concat(port, "/"));
  }
}
/**
 * Event listener for HTTP server "listening" event.
 */
Event listener for HTTP server "listening" event.
Event listener for HTTP server " listening " event .
function onListening() {
  if (process.env.NODE_ENV === 'development' || process.env.NODE_ENV === 'production') {
    console.log("Server is listening on http://localhost:".concat(port, "/"));
  }
}
function onListening ( ) { if ( process . env . NODE_ENV === 'development' || process . env . NODE_ENV === 'production' ) { console . log ( "Server is listening on http://localhost:" . concat ( port , "/" ) ) ; } }
Event listener for HTTP server "listening" event.
Event listener for HTTP server " listening " event .