{
  description = "arr — single-service replacement for Radarr and Sonarr";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
    rust-overlay = {
      url = "github:oxalica/rust-overlay";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = { self, nixpkgs, flake-utils, rust-overlay }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs {
          inherit system;
          overlays = [ (import rust-overlay) ];
        };

        rust = pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
      in
      {
        devShells.default = pkgs.mkShell {
          buildInputs = with pkgs; [
            rust
            cargo-nextest
            cargo-machete
            cargo-deny
            just
            sqlite
            # arr-probe shells out to ffprobe; the e2e fixtures need ffmpeg.
            ffmpeg
            # Frontend, from issue #6 onwards.
            nodejs
            pnpm
            biome
          ];

          shellHook = ''
            echo "arr dev shell — 'just' lists the entry points"
          '';
        };
      });
}