package-npm-nix

<quick_start> <pre_built_from_npm> For tools already built and published to npm (fastest approach):

{
  lib,
  stdenv,
  fetchzip,
  nodejs,
}:

stdenv.mkDerivation rec {
  pname = "tool-name";
  version = "1.0.0";

  src = fetchzip {
    url = "https://registry.npmjs.org/${pname}/-/${pname}-${version}.tgz";
    hash = "sha256-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=";
  };

  nativeBuildInputs = [ nodejs ];

  installPhase = ''
    runHook preInstall

    mkdir -p $out/bin
    cp $src/dist/cli.js $out/bin/tool-name
    chmod +x $out/bin/tool-name

    # Fix shebang
    substituteInPlace $out/bin/tool-name \
      --replace-quiet "#!/usr/bin/env node" "#!${nodejs}/bin/node"

    runHook postInstall
  '';

  meta = with lib; {
    description = "Tool description";
    homepage = "https://github.com/org/repo";
    license = licenses.mit;
    sourceProvenance = with lib.sourceTypes; [ binaryBytecode ];
    maintainers = with maintainers; [ ];
    mainProgram = "tool-name";
    platforms = platforms.all;
  };
}

Get the hash:

nix-prefetch-url --unpack https://registry.npmjs.org/tool-name/-/tool-name-1.0.0.tgz
# Convert to SRI format:
nix hash convert --to sri --hash-algo sha256 <hash-output>

</pre_built_from_npm>

<source_build_with_bun> For tools that need to be built from source using Bun:

{
  lib,
  stdenv,
  stdenvNoCC,
  fetchFromGitHub,
  bun,
  makeBinaryWrapper,
  nodejs,
  autoPatchelfHook,
}:

let
  fetchBunDeps =
    { src, hash, ... }@args:
    stdenvNoCC.mkDerivation {
      pname = args.pname or "${src.name or "source"}-bun-deps";
      version = args.version or src.version or "unknown";
      inherit src;

      nativeBuildInputs = [ bun ];

      buildPhase = ''
        export HOME=$TMPDIR
        export npm_config_ignore_scripts=true
        bun install --no-progress --frozen-lockfile --ignore-scripts
      '';

      installPhase = ''
        mkdir -p $out
        cp -R ./node_modules $out
        cp ./bun.lock $out/
      '';

      dontFixup = true;
      outputHash = hash;
      outputHashAlgo = "sha256";
      outputHashMode = "recursive";
    };

  version = "1.0.0";
  src = fetchFromGitHub {
    owner = "org";
    repo = "repo";
    rev = "v${version}";
    hash = "sha256-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=";
  };

  node_modules = fetchBunDeps {
    pname = "tool-name-bun-deps";
    inherit version src;
    hash = "sha256-BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB=";
  };
in
stdenv.mkDerivation rec {
  pname = "tool-name";
  inherit version src;

  nativeBuildInputs = [
    bun
    nodejs
    makeBinaryWrapper
    autoPatchelfHook
  ];

  buildInputs = [
    stdenv.cc.cc.lib
  ];

  buildPhase = ''
    # Verify lockfile match
    diff -q ./bun.lock ${node_modules}/bun.lock || exit 1

    # Copy and patch node_modules
    cp -R ${node_modules}/node_modules .
    chmod -R u+w node_modules
    patchShebangs node_modules
    autoPatchelf node_modules

    export HOME=$TMPDIR
    export npm_config_ignore_scripts=true
    bun run build
  '';

  installPhase = ''
    mkdir -p $out/bin
    cp dist/tool-name $out/bin/tool-name
    chmod +x $out/bin/tool-name
  '';

  dontStrip = true;

  meta = with lib; {
    description = "Tool description";
    homepage = "https://github.com/org/repo";
    license = licenses.mit;
    sourceProvenance = with lib.sourceTypes; [ fromSource ];
    maintainers = with maintainers; [ ];
    mainProgram = "tool-name";
    platforms = [ "x86_64-linux" ];
  };
}

</source_build_with_bun> </quick_start>

Check the npm package:

# Download and inspect
nix-prefetch-url --unpack https://registry.npmjs.org/package/-/package-1.0.0.tgz
ls -la /nix/store/<hash>-package-1.0.0.tgz/