Power BI visual tools 3.0.x brings modernES6 modulesinto TypeScript code. The new tools are backward compatible so you can keep your source code as is. In order to use new version of libraries like D3v5 some changes are required, please checkthisarticle for the full migration guide.
Do you need some examples?
Please check these visuals that were already migrated toES6and converted to use Webpack.