An example npm-based library bundled with Rollup and an example npm-based program that consumes it.
This example project is a translation of the ../npm-libary/ project with the addition of bundling. The library code
is bundled into a single file (animals.mjs) using Rollup.
I won't repeat the same README content that was already written in ../npm-library. Please study the README in that
project to better understand this one.