davidecarvalho / teste-rollup

Rollup and SystemJS POC

Since some libraries are using rollup to bundle, i wanted to give it a try. It seamed cool, since it bundles to diferent types of modules, like UMD, ESM and etc... And SystemJS is famous a es module loader. I never used it, but testing it would be nice.

Considerations

Rollup Configuration

I don't know if I got too much used with Parcel, but a config file is just too boring to do. I also had a problem with UMD file and I had to put a plugin to solve it. Seeing the bright side, it's nice that we can bundle multiples types of modules, this make libs reusable accross the js enviroments.

Package Name Map

This is a really nice feature. Just make a json with all the packages you need and systemjs will get them for you. But I don't know why, I couldn't get it to work. I had to System.import() hybrids lib so I could use the component, and it doesn't look good. Since SystemJS 2.0 just came out, I'll try at a later time.

System.import to import the libs

I know that SystemJs is really close to the real spec, but using a lib just doesn't look good to me. I hope the Package Name Map becomes a native spec real soom, it will be better to use only <script type="module"></script> to load.

SystemJS size

It's really a tiny lib, so it won't impact application performance. Use it without trouble.