37-haskell-transformer-stack
This example shows intermediate Haskell effect composition with a transformer stack.
It includes:
- a rollout environment carried by
ReaderT, - explicit rollout failures carried by
ExceptT, - ordered audit lines carried by
Writer, - one stacked workflow that validates and renders a rollout summary, and
- a test suite run by
nix flake check.
Useful commands:
nix develop
cabal run
cabal run -- api:production:4
cabal test
nix build
./result/bin/mini-stack api:production:4
nix run . -- api:production:4
nix flake check