{ pkgs ? (import <nixpkgs> {})
, stdenv ? pkgs.stdenv
, nodejs ? pkgs.nodejs
, overrides ? (self: super: {})
}:

let

  inherit (stdenv) lib;

  _mkDummy = name: version: pkgs.runCommand "${name}-${version}-dummy" {} ''
    mkdir -p $out
    cat <<PKG > $out/package.json
      {
        "name": "${name}",
        "version": "${version}-dummy",
        "description": "A dummy package to ease bootstrapping",
        "main": "index.js",
        "license": "PUBLIC DOMAIN",
        "files": ["index.js"]
      }
    PKG

    cat <<SRC > $out/index.js
    SRC
  '';

  inherit (import ./lib.nix) dontCheck;

  packages = (self:
    let
      callPackage = pkgs.newScope self;

      buildNpmPackageImpl = callPackage ./buildNpmPackage.nix { };

      buildNpmPackage = lib.makeOverridable buildNpmPackageImpl;

    in rec {
      inherit
        buildNpmPackage nodejs
        ;

      npmPackages = self;

      # XXX dummy package are to help bootstrapping.
      # XXX Usually these are devDependencies needed to run tests.

      _dummy_chalk = _mkDummy "chalk" "2.4.2";
      _dummy_covert = _mkDummy "covert" "1.1.1";
      _dummy_mock-fs = _mkDummy "mock-fs" "4.10.1";
      _dummy_tap = _mkDummy "tap" "14.6.5";
      _dummy_tape = _mkDummy "tape" "4.11.0";
      _dummy_xo = _mkDummy "xo" "0.25.3";


      # XXX packages with underscore are "incomplete".
      # XXX Should only be used to resolve circular dependencies.

      _color-convert = dontCheck (callPackage ./color-convert {
        chalk = _dummy_chalk;
        xo = _dummy_xo;
      });

      _minimist = dontCheck (callPackage ./minimist {
        covert = _dummy_covert;
        tap = _dummy_tap;
        tape = _dummy_tape;
      });

      _mkdirp = dontCheck (callPackage ./mkdirp {
        minimist = _minimist;
        mock-fs = _dummy_mock-fs;
        tap = _dummy_tap;
      });

      _semver = dontCheck (callPackage ./semver {
        tap = _dummy_tap;
      });

      _wrappy = dontCheck (callPackage ./wrappy {
        tap = _dummy_tap;
      });

      async-foreach = callPackage ./async-foreach {};
      chartjs-color-string = callPackage ./chartjs-color-string { };
      color-name = callPackage ./color-name {};
      posix-getopt = callPackage ./posix-getopt {};
    }
  );

in lib.fix' (lib.extends overrides packages)