This is an example project using the gazelle_haskell_modules extension.
Run the following to generate the haskell_module rules from the other
Haskell rules.
echo "build --host_platform=@io_tweag_rules_nixpkgs//nixpkgs/platforms:host" > .bazelrc.local
nix-shell --pure --run "bazel run //:gazelle"Then you can check the generated rules in example/package-a/BUILD.bazel
and example/package-b/BUILD.bazel.
Now you should be able to build and test with
nix-shell --pure --run "bazel test //..."