Install the dependencies...
npm install...then start Rollup:
npm run devNavigate to localhost:5000. You should see your app running. Edit a component file in src, save it, and reload the page to see your changes.
By default, the server will only respond to requests from localhost. To allow connections from other computers, edit the sirv commands in package.json to include the option --host 0.0.0.0.
To create an optimised version of the app:
npm run buildYou can run the newly built app with npm run start. This uses sirv, which is included in your package.json's dependencies so that the app will work when you deploy to platforms like Heroku.