These pages were made before @developit created @babel/preset-modules, which is the best way today to build differentially loaded bundles.

Might also be good to mentioned @babel/preset-env+bugfixes: true, but I think @babel/preset-modules is ideal.

https://web.dev/codelab-serve-modern-code/
https://web.dev/serve-modern-code-to-modern-browsers/

@housseindjirdeh