React DOM + Rollup Treehsaking

To see this bug in action:

1. Clone this repo
2. Install dependencies with yarn install or npm install
3. Run yarn start:treeshake
4. Visit localhost:10001

If the react app (defined in main.jsx) is rendering correclty, you should see: "Hello, World!" inside of an <h1> tag

This is "fixed" by disabling treeshaking, which you can do:

yarn start:notreeshake