From Angular8 release onwards, the applications are built using differential loading strategy from CLI to build two separate bundles as part of your deployed application.
- The first build contains ES2015 syntax which takes the advantage of built-in support in modern browsers, ships less polyfills, and results in a smaller bundle size.
- The second build contains old ES5 syntax to support older browsers with all necessary polyfills. But this results in a larger bundle size.
Note: This strategy is used to support multiple browsers but it only load the code that the browser needs.
