Say hello to bastion! It builds JavaScript related things for you with zero configuration. Don't worry, there's a powerful configuration file, but the defaults are pretty great!
In this repository you'll find Elm and React code side by side with hot module reloading. That means you can change the code and it'll update live in your browser without losing the state.
The only configuration is a couple of simple lines in bastion.conf.js, you don't even need that if you just want a simple JavaScript application. You could still use React without this configuration file, the live reloading just wouldn't maintain state.
That configuration calls the pre-built mixins for React HMR and seamless Elm support, again with HMR. I hope to add more of these for things like CSS and image importing.
You can compile the code into ./dist/bundle.js with make build. If you have bastion installed globally you can just run bastion, that's all the makefile is doing.
There's also make dev which just maps to bastion --dev. This starts the dev server (at port 8080 by default) and will automatically hot reload modules as you change them.
Check out the bastion repository as well as the files within this one. Especially bastion.conf.js, Makefile and ./src/entry.js.