Вот эту пробовал
https://dev.to/egregors/vscode-for-haskell-in-2020-5dn8Так пишет делай раз
stack install intero QuickCheck hlint brittany ghcid
На что получаю
Error: While constructing the build plan, the following exceptions were encountered:
In the dependencies for intero-0.1.40:
ghc-8.8.4 from stack configuration does not match >=7.8 && <=8.6.5 (latest matching version is 8.6.5)
needed since intero is a build target.
Some different approaches to resolving this:
* Set 'allow-newer: true' in /home/alex/.stack/config.yaml to ignore all version constraints and build anyway.
* Recommended action: try adding the following to your extra-deps in /home/alex/prj/ByLanguage/haskell/test0003/stack.yaml:
- ghc-8.6.5@sha256:3591225289bdf8cf8f62b10f2aebc9ea3e25a15294545a5312a419e0317784f9,13976
Plan construction failed.