CosmWasmJS is outdated and unmaintained. See https://medium.com/cosmwasm/dev-note-2-why-we-are-sunsetting-cosmwasmjs-61d8706418e6.
This fork is just a slightly hacked copy to export what we need in a bundle
run npm run webpack
to create the bundled js which will live in dist/bundle.js
nice little tutorial on quick setup: https://hackmd.io/@0xGhastly/H1GlUwiZh