How does angular2 deploy to a formal environment

  node.js, question

The development process in angular2 tutorial needs to run npm start to start the server. Do you want to start the server after deployment to a formal server, or what should be done after angular2 development before deployment to a formal environment

The deployment has nothing to do with angular. the reason why you want npm start is that you combine it with node.js. you want to deploy node.js application instead of angular.