Why is it difficult? It's just a command line tool with a config file.

I'm not familiar with this tool, but with Babel, you wouldn't use it to bundle your code. That's what Webpack/Rollup/Parcel is for.

If you don't care about targeting older browsers, you can use ES Modules today without a bundler. Even dynamic imports work without transpiling or polyfilling.

> It’s suprisingly difficiult to use use these tools just to bundle your code, but not transpile it down.

Isn't that what Rollup is for?