- Dev Build
- local server
- HMR -Hot Module Replacment
- File Watching Algorithm -written in c++
- Caching -Faster Builds (parcel cache file)
- Image Optimization
- minification
- Bundle
- compressing
- consistent Hashing
- Code Splitting
- Differntial Bundling(to support older browsers)
- Diagnostic
- Error Handling
- HTTPS
- TREE SHAKING (Remove unused code )
- Different dev and prod bundles