No cradle found for filename.hs. Proceeding with implicit cradle

Question

I am using haskell at VSCode. And i use stack's ghc. (i wrote export PATH=$PATH:/home/username/.stack/programs/x86_64-linux/ghc-tinfo6-8.8.3/bin at ~/.bashrc)

I don't have any problem at this, but nowadays, i can get the message at the VSCcode like this:

No [cradle](https://github.com/mpickering/hie-bios#hie-bios) found for filename.hs. Proceeding with [implicit cradle](https://hackage.haskell.org/package/implicit-hie)

I cannot find the same message or solutions at Google. How can i solve this? or what cause the problem?

Answer 1

If you have 2 files ./app/Main.hs and ./test/Spec.hs, you can create a hie.yaml at the workspace root . with:

cradle:
  multi:
    - path: "./"
      config:
        cradle:
          stack:
            - path: "./app/Main.hs"
            - path: "./test/Spec.hs"

This should silence the error. Also, having stack in the system path is enough.

Answer 2

you can try create file "hie.yaml" to your project and write in "hie.yaml": cradle: stack:

Answer 3

Bob and Maksim are right. For completeness sake I would add that I found https://github.com/mpickering/hie-bios to be of interest, and that a minimal hie.yaml containing

cradle:
  stack:

can work for a simple project.