Reference Error: React is Not Defined (Preact)

I'm trying to make my own preact boilerplate (for learning) and I trying to learn by referencing the preact-boilerplate and reading the preact start guide.

I have crated a repo here to reference. But for some reason, it looks like its looking for a React to load my app to the DOM.

Here's my repo for duplication: https://github.com/abarcenas29/preact-sandbox-v0

Many thanks.

via Mr A