An example of one way you could use hot reloading with Halogen.
Video of this in action: https://github.com/justinwoo/halogen-parcel-hot-reload-demo
See the original React-Basic version here: https://github.com/justinwoo/purescript-parcel-example, probably improved version of this here: https://github.com/justinwoo/spacchetti-react-basic-starter