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# 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
```