Before you can deploy your angular project, you need to build a version with your prod environment variables. Make sure to add your production firebase configuraiton to the src/environments/environment.prod.ts before you build.

# build the angular project, creates a dist folder in your directory
ng build -prod

You must initialize Firebase Hosting in order to deploy your application. In order to do this run the firebase init command. This command prompts you to give the public directory. Choose the /dist directory created by the ng build -prod. firebase init will also ask you if you want to overwrite your index file. Type no since your angular app includes a index file.

To deploy your app, simply run firebase deploy!

For more information on Firebase init and deploy commands, checkout the Firebase CLI documentation.