1. Internationalization (i18n) is the process of preparing software so that it supports local languages and cultural settings
2. Babel
3. To convert ECMAScript to an earlier version for compatibility purposes.
4. Loader-builder
5. The loader allows you to write mixed HTML, CSS and JavaScript Polymer element
6. The ability to make mixed-use HTML, CSS and JavaScript files and process them in the Webpack environment.
7. The compiler.