How can I pass custom build options JUST to HLS? about haskell-language-server

[fendor]

The easiest way is to write a stack-hls.yaml file that contains the options that you want and tell HLS to use that.

I can think of two solutions / workarounds:

1. Provide the STACK_YAML variable to HLS only https://github.com/haskell/vscode-haskell?tab=readme-ov-file#set-additional-environment-variables-for-the-server
2. Provide the stackYaml key in hie.yaml (https://hackage.haskell.org/package/hie-bios-0.14.0/#stack) and tell git to ignore changes, for example via git update-index --assume-unchanged hie.yaml.

I open a file in the editor and HLS starts building, but the build flags have changed so it starts over

I believe, this happens because HLS tells stack to use our custom compiler, which invalidates the caches. You can provide a different work-dir, this should avoid cache invalidation: https://docs.haskellstack.org/en/stable/environment_variables/#stack_work

[fendor]

Ill consider this issue resolved, feel free to open a new issue, if you want to propose a new feature :)

[ChrisPenner]

@fendor ah great, this gives me something to work with! A bit annoying that I need to copy the whole stack.yaml and keep that up to date though 😢 ; but I'll give this a try 🙌🏼