# 30-haskell-traverse-resolution

This example shows intermediate Haskell batch resolution with `traverse`.

It includes:

- a deployment request type parsed from compact CLI input,
- a service catalog with per-service release metadata,
- one `traverse` pass that resolves every request or fails the whole batch, and
- a test suite run by `nix flake check`.

Useful commands:

```bash
nix develop
cabal run
cabal run -- api:production:stable worker:staging:candidate auth:production:stable
cabal test

nix build
./result/bin/mini-resolution api:production:stable worker:staging:candidate auth:production:stable

nix run . -- api:production:stable worker:staging:candidate auth:production:stable
nix flake check
```