Configuring different build options

- [Narrator] It is important to know that by default, … the JavaScript bundles are not optimized. … What I mean by that … is that they are not minified … nor uglified for performance. … Also, the bundle names do not contain … a hash for cache busting. … By default, ng build runs a development build. … Let's run a production build. … And we can do that … by using ng build --configuration=production. … The dist directory is discarded … and it is running a fresh build. … Once that is complete, … let's take a look again at the dist folder. … In this case, we now see … that the source maps were not generated, … and the bundle filenames include a hash for cache busting. … Also, they have been minified and uglified, … thus significantly reducing the file size of these bundles. … If you'd like to generate source maps in a production build, … you can use a new flag: … ng build --configuration=production … - -source-map. … In order to see what this production configuration entails, … We can take a look at the angular.json file. …