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haskellcabal

Which cabal packages aren't being used

If I crank up the warnings with GHC, it will warn me which imports aren't being used....

Is there a similar command to tell me which build-depends aren't being used in my <project>.cabal file?

Solution

  • packunused is a simple CLI tool allows to find out which of the packages listed as build-depends in a Cabal package description file are redundant.

    You have to build your project with -ddump-minimal-imports then run packunused:

    cabal build --ghc-option=-ddump-minimal-imports
packunused

    It will print a list of package dependencies that seem to be unused.