For building to work you nee need to have Node installed.
You can create an optimized production build by running the following command. The output will be available in the folder public.
npm run build:production
You can create a development build with the following command.
npm run build:development
The next command starts the devlopment environment. The code will automatically be compiled in the background and you can view the result at http://localhost:8080.
npm run start:development