For faster edit-compile-run cycle it is recommended to to use GHCJSi as follows.
First, enter the Nix configured shell environment:
nix-shell -A env
Then, enter the GHCJSi shell:
cabal configure --ghcjs
cabal repl
GHCJSi starts up a web server. You should immediately connect to it from the web browser via http://localhost:6400/
From the GHCJSi shell--and everytime Main.js changes--recompile and send the new code to the browser:
> import Miso.Dev # Once
> :r
> clearBody >> main
The UI in the web browser will now update automatically with the new code. Happy hacking!
This application can be built for production and run as follows:
nix-build
warp -d result/bin/app.jsexe/ # Port 3000