Build Dart packages with Nix.

This project requires Nix Flakes, which is currently an unstable feature.

Given a Dart project tree with a pubspec.yaml and pubspec.lock, run the following to generate a pub2nix.lock file.

nix run github:tadfisher/nix-dart#pub2nix-lock

In the derivation building the project, use builders.${system}.buildDartPackage from this flake. The required arguments are

• specFile: Path to pubspec.yaml for the project. Usually packaged with the source tree.
• lockFile: Path to the generated pub2nix.lock. It's easiest to distribute this alongside the Nix derivation.

An example derivation for dart-sass follows.

{ lib, stdenv, fetchFromGitHub, buildDartPackage }:

buildDartPackage rec {
  pname = "dart-sass";
  version = "1.32.5";

  src = fetchFromGitHub {
    owner = "sass";
    repo = pname;
    rev = version;
    hash = "sha256-HNviEUUgLdDH8WN8rXwtZ8t4u8s/nIs7iITCiBF7pas=";
  };

  specFile = "${src}/pubspec.yaml";
  lockFile = ./pub2nix.lock;

  meta = with lib; {
    description = "The reference implementation of Sass, written in Dart";
    homepage = "https://sass-lang.com/dart-sass";
    maintainers = [ maintainers.tadfisher ];
    license = licenses.mit;
  };
}

Up-to-date Dart SDK packages are available in packages.${system}: dart, dart-beta, and dart-dev. These are checked daily and updated via CI.

buildDartPackage, pub2nix-lock, and the Dart SDK packages are also available in overlay.

A binary cache is available at nix-dart.cachix.org.

Thanks to Paul Young for creating pub2nix. This project passes through pub2nix-lock, and buildDartPackage is based on my previous efforts to package Dart projects merged with pub2nix's mechanism to generate the offline dependency cache.

Apache 2.0.