As we mentioned in step 4, the Angular engine applies the service work in the application only in production mode; that is, only when we use the ng build command.

So, let's look at how this works in practice. But first, let's see if everything has happened as expected, with the creation of the application and the installation of @angular/pwa:

1. Open your Terminal window in the ./Client folder, and type the following command:

npm start

Remember that the npm start command is the same as ng server; you can check all of the npm aliases on the scripts tag inside of package.json. There, we have the following aliases:

     "scripts": {
                "ng": "ng",
                "start": "ng serve",
                "build": "ng build",
                "test": "ng test"...