# 34-haskell-dependency-order

This example shows intermediate Haskell dependency planning with graph traversal.

It includes:

- a service catalog with inter-service dependencies,
- cycle detection and unknown-service rejection,
- a deployment plan rendered in dependency order, and
- a test suite run by `nix flake check`.

Useful commands:

```bash
nix develop
cabal run
cabal run -- frontend billing
cabal test

nix build
./result/bin/mini-dependency-order frontend billing

nix run . -- frontend billing
nix flake check
```