# 32-haskell-nonempty-waves

This example shows intermediate Haskell rollout planning with `NonEmpty`.

It includes:

- a deployment job with rolling and canary modes,
- a `NonEmpty` list of rollout waves that guarantees at least one step,
- a CLI that renders a wave-by-wave plan, and
- a test suite run by `nix flake check`.

Useful commands:

```bash
nix develop
cabal run
cabal run -- api:production:canary:20:6
cabal test

nix build
./result/bin/mini-waves api:production:canary:20:6

nix run . -- api:production:canary:20:6
nix flake check
```