This is just copying the Cornerstone example from here: Basic Stack Viewport Usage.
I wasn't able to import some of the utilities that this example uses, even though they are present in my node_modules directory. Probably a webpack config issue or something. So in this demo I just manually copy-pasted the necessary util code, which makes this a bit messy to read.
yarn install
yarn startIt claims to run on https://localhost:3000/, but I'm probably missing some configuration somewhere. I'm able to access at http://192.168.4.232:3000/.