I use the Haskell Miso framework to write frontend web apps and the Nix compilation process takes a long time.
How can I speed it up?
Or what is the recommended approach to have a near instantaneous edit-compile-run cycle?
(Credit goes to NickSeagull)
For faster edit-compile-run cycle it is recommended 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.hs
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!
Example project
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