├── .envrc ├── .github └── workflows │ └── ci.yml ├── .gitignore ├── README.md ├── default.nix ├── fixtures ├── kitchen_sink │ ├── package-lock.json │ └── package.json └── trivial │ ├── package-lock.json │ └── package.json ├── flake.lock ├── flake.nix ├── hooks ├── default.nix ├── link-node-modules-hook.sh └── link-node-modules.js └── tests.nix /.envrc: -------------------------------------------------------------------------------- 1 | use flake 2 | -------------------------------------------------------------------------------- /.github/workflows/ci.yml: -------------------------------------------------------------------------------- 1 | name: Nix checks 2 | 3 | on: 4 | pull_request: 5 | push: 6 | branches: 7 | - master 8 | - main 9 | 10 | jobs: 11 | tests: 12 | runs-on: ubuntu-latest 13 | outputs: 14 | matrix: ${{ steps.set-matrix.outputs.matrix }} 15 | steps: 16 | - uses: actions/checkout@v4 17 | - uses: cachix/install-nix-action@v23 18 | - id: set-matrix 19 | name: Run tests 20 | run: nix-instantiate --eval --expr 'import ./tests.nix { }' --strict --json | jq -e '. == []' > /dev/null 21 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | node_modules 2 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # buildNodeModules 2 | 3 | The dumbest node to Nix packaging solution yet! 4 | 5 | Status: This project has been integrated into nixpkgs as [importNpmLock](https://nixos.org/manual/nixpkgs/unstable/#javascript-buildNpmPackage-importNpmLock). 6 | 7 | ## How it works 8 | 9 | ### How node_modules is built 10 | 11 | - Map over package-lock.json packages, invoke correct fetcher 12 | 13 | - Update package.json & package-lock.lock to point to store paths 14 | URLs are rewritten to `file:...` dependencies that link to the Nix store. 15 | 16 | - Run `npm install` 17 | 18 | ### How node_modules is linked 19 | Our configure/shell hook links individual directories inside the Nix built `node_modules` directory. 20 | This is to work around issues like https://github.com/nix-community/npmlock2nix/issues/86 and that tools like `vite` expects a writable node_modules. 21 | 22 | ## Usage 23 | 24 | - `default.nix` 25 | ``` nix 26 | stdenv.mkDerivation { 27 | pname = "my-website"; 28 | version = "0.1.0"; 29 | 30 | src = ./.; 31 | 32 | nativeBuildInputs = [ 33 | buildNodeModules.hooks.npmConfigHook 34 | nodejs 35 | nodejs.passthru.python # for node-gyp 36 | npmHooks.npmBuildHook 37 | npmHooks.npmInstallHook 38 | ]; 39 | 40 | npmDeps = buildNodeModules.fetchNodeModules { 41 | npmRoot = ./.; 42 | }; 43 | } 44 | ``` 45 | 46 | - `shell.nix` 47 | ``` nix 48 | pkgs.mkShell { 49 | packages = [ 50 | buildNodeModules.hooks.linkNodeModulesHook 51 | nodejs 52 | ]; 53 | 54 | npmDeps = buildNodeModules.buildNodeModules { 55 | npmRoot = ./.; 56 | inherit nodejs; 57 | }; 58 | } 59 | ``` 60 | -------------------------------------------------------------------------------- /default.nix: -------------------------------------------------------------------------------- 1 | { lib 2 | , stdenv 3 | , fetchNpmLock 4 | , callPackages 5 | }: 6 | 7 | let 8 | inherit (builtins) toJSON removeAttrs; 9 | inherit (lib) importJSON; 10 | 11 | getName = package: package.name or "unknown"; 12 | getVersion = package: package.version or "0.0.0"; 13 | 14 | in 15 | { 16 | # Build node modules from package.json & package-lock.json 17 | buildNodeModules = 18 | { npmRoot ? null 19 | , package ? importJSON (npmRoot + "/package.json") 20 | , packageLock ? importJSON (npmRoot + "/package-lock.json") 21 | , nodejs 22 | , ... 23 | }@attrs: 24 | stdenv.mkDerivation (removeAttrs attrs [ "npmRoot" "package" "packageLock" "nodejs" ] // { 25 | pname = "${getName package}-node-modules"; 26 | version = getVersion package; 27 | 28 | dontUnpack = true; 29 | 30 | npmDeps = fetchNpmLock { 31 | inherit npmRoot package packageLock; 32 | }; 33 | 34 | nativeBuildInputs = [ 35 | nodejs 36 | nodejs.passthru.python 37 | fetchNpmLock.npmConfigHook 38 | ]; 39 | 40 | package = toJSON package; 41 | packageLock = toJSON packageLock; 42 | passAsFile = [ "package" "packageLock" ]; 43 | 44 | postPatch = '' 45 | cp --no-preserve=mode "$packagePath" package.json 46 | cp --no-preserve=mode "$packageLockPath" package-lock.json 47 | ''; 48 | 49 | installPhase = '' 50 | runHook preInstall 51 | mkdir $out 52 | cp package.json $out/ 53 | cp package-lock.json $out/ 54 | [[ -d node_modules ]] && mv node_modules $out/ 55 | runHook postInstall 56 | ''; 57 | }); 58 | 59 | # Manage node_modules outside of the store with hooks 60 | hooks = callPackages ./hooks { }; 61 | } 62 | -------------------------------------------------------------------------------- /fixtures/kitchen_sink/package-lock.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "fetch-package-lock", 3 | "version": "1.0.0", 4 | "lockfileVersion": 3, 5 | "requires": true, 6 | "packages": { 7 | "": { 8 | "name": "fetch-package-lock", 9 | "version": "1.0.0", 10 | "license": "ISC", 11 | "dependencies": { 12 | "express": "expressjs/express#4.18.2", 13 | "node-fetch": "github:node-fetch/node-fetch", 14 | "trivial": "file:../trivial" 15 | } 16 | }, 17 | "../trivial": { 18 | "version": "1.0.0", 19 | "license": "ISC" 20 | }, 21 | "node_modules/accepts": { 22 | "version": "1.3.8", 23 | "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.8.tgz", 24 | "integrity": "sha512-PYAthTa2m2VKxuvSD3DPC/Gy+U+sOA1LAuT8mkmRuvw+NACSaeXEQ+NHcVF7rONl6qcaxV3Uuemwawk+7+SJLw==", 25 | "dependencies": { 26 | "mime-types": "~2.1.34", 27 | "negotiator": "0.6.3" 28 | }, 29 | "engines": { 30 | "node": ">= 0.6" 31 | } 32 | }, 33 | "node_modules/array-flatten": { 34 | "version": "1.1.1", 35 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"test": "echo \"Error: no test specified\" && exit 1" 8 | }, 9 | "author": "", 10 | "license": "ISC", 11 | "dependencies": { 12 | "express": "expressjs/express#4.18.2", 13 | "node-fetch": "github:node-fetch/node-fetch", 14 | "trivial": "file:../trivial" 15 | } 16 | } 17 | -------------------------------------------------------------------------------- /fixtures/trivial/package-lock.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "trivial", 3 | "version": "1.0.0", 4 | "lockfileVersion": 3, 5 | "requires": true, 6 | "packages": { 7 | "": { 8 | "name": "trivial", 9 | "version": "1.0.0", 10 | "license": "ISC" 11 | } 12 | } 13 | } 14 | -------------------------------------------------------------------------------- /fixtures/trivial/package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "trivial", 3 | "version": "1.0.0", 4 | "description": "", 5 | "main": "index.js", 6 | "scripts": { 7 | "test": "echo \"Error: no test specified\" && exit 1" 8 | }, 9 | "author": "", 10 | "license": "ISC" 11 | } 12 | -------------------------------------------------------------------------------- /flake.lock: -------------------------------------------------------------------------------- 1 | { 2 | "nodes": { 3 | "nixpkgs": { 4 | "locked": { 5 | "lastModified": 1708407325, 6 | "narHash": "sha256-P93MEydbhBe97i+8JKZUgfxZRr7/LoMiHvfb8VLFZ4k=", 7 | "owner": "adisbladis", 8 | "repo": "nixpkgs", 9 | "rev": "f73c22fb5094f9829695469130b2c04059c7a425", 10 | "type": "github" 11 | }, 12 | "original": { 13 | "owner": "adisbladis", 14 | "ref": "fetchnpmlock", 15 | "repo": "nixpkgs", 16 | "type": "github" 17 | } 18 | }, 19 | "root": { 20 | "inputs": { 21 | "nixpkgs": "nixpkgs" 22 | } 23 | } 24 | }, 25 | "root": "root", 26 | "version": 7 27 | } 28 | -------------------------------------------------------------------------------- /flake.nix: -------------------------------------------------------------------------------- 1 | { 2 | description = "buildNodeModules - The dumbest way to build NodeJS yet!"; 3 | 4 | inputs = { 5 | nixpkgs.url = "github:adisbladis/nixpkgs/fetchnpmlock"; 6 | }; 7 | 8 | outputs = { self, nixpkgs }: 9 | let 10 | inherit (nixpkgs) lib; 11 | pkgs = nixpkgs.legacyPackages.x86_64-linux; 12 | in 13 | { 14 | lib = lib.listToAttrs (map 15 | (system: lib.nameValuePair system ( 16 | pkgs.callPackage ./. { } 17 | )) 18 | lib.systems.flakeExposed); 19 | 20 | checks.x86_64-linux.default = 21 | self.lib.x86_64-linux.buildNodeModules { 22 | npmRoot = ./fixtures/kitchen_sink; 23 | nodejs = pkgs.nodejs; 24 | }; 25 | 26 | devShells.x86_64-linux.default = pkgs.mkShell { 27 | packages = [ 28 | pkgs.nodejs 29 | ]; 30 | }; 31 | }; 32 | } 33 | -------------------------------------------------------------------------------- /hooks/default.nix: -------------------------------------------------------------------------------- 1 | { callPackage, lib, makeSetupHook, srcOnly, nodejs }: 2 | { 3 | linkNodeModulesHook = makeSetupHook { 4 | name = "node-modules-hook.sh"; 5 | substitutions = { 6 | nodejs = lib.getExe nodejs; 7 | script = ./link-node-modules.js; 8 | storePrefix = builtins.storeDir; 9 | }; 10 | } ./link-node-modules-hook.sh; 11 | } 12 | -------------------------------------------------------------------------------- /hooks/link-node-modules-hook.sh: -------------------------------------------------------------------------------- 1 | linkNodeModulesHook() { 2 | echo "Executing linkNodeModulesHook" 3 | runHook preShellHook 4 | 5 | if [ -n "${npmRoot-}" ]; then 6 | pushd "$npmRoot" 7 | fi 8 | 9 | @nodejs@ @script@ @storePrefix@ "${npmDeps}/node_modules" 10 | if test -f node_modules/.bin; then 11 | export PATH=$(readlink -f node_modules/.bin):$PATH 12 | fi 13 | 14 | if [ -n "${npmRoot-}" ]; then 15 | popd 16 | fi 17 | 18 | runHook postShellHook 19 | echo "Finished executing linkNodeModulesShellHook" 20 | } 21 | 22 | if [ -z "${dontLinkNodeModules:-}" ] && [ -z "${shellHook-}" ]; then 23 | echo "Using linkNodeModulesHook shell hook" 24 | shellHook=linkNodeModulesHook 25 | fi 26 | 27 | 28 | if [ -z "${dontLinkNodeModules:-}" ]; then 29 | echo "Using linkNodeModulesHook preConfigure hook" 30 | preConfigureHooks+=(linkNodeModulesHook) 31 | fi 32 | -------------------------------------------------------------------------------- /hooks/link-node-modules.js: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env node 2 | const fs = require("fs"); 3 | const path = require("path"); 4 | 5 | async function asyncFilter(arr, pred) { 6 | const filtered = []; 7 | for (const elem of arr) { 8 | if (await pred(elem)) { 9 | filtered.push(elem); 10 | } 11 | } 12 | return filtered; 13 | } 14 | 15 | // Get a list of all _unmanaged_ files in node_modules. 16 | // This means every file in node_modules that is _not_ a symlink to the Nix store. 17 | async function getUnmanagedFiles(storePrefix, files) { 18 | return await asyncFilter(files, async (file) => { 19 | const filePath = path.join("node_modules", file); 20 | 21 | // Is file a symlink 22 | const stat = await fs.promises.lstat(filePath); 23 | if (!stat.isSymbolicLink()) { 24 | return true; 25 | } 26 | 27 | // Is file in the store 28 | const linkTarget = await fs.promises.readlink(filePath); 29 | return !linkTarget.startsWith(storePrefix); 30 | }); 31 | } 32 | 33 | async function main() { 34 | const args = process.argv.slice(2); 35 | const storePrefix = args[0]; 36 | const sourceModules = args[1]; 37 | 38 | // Ensure node_modules exists 39 | try { 40 | await fs.promises.mkdir("node_modules"); 41 | } catch (err) { 42 | if (err.code !== "EEXIST") { 43 | throw err; 44 | } 45 | } 46 | 47 | const files = await fs.promises.readdir("node_modules"); 48 | 49 | // Get deny list of files that we don't manage. 50 | // We do manage nix store symlinks, but not other files. 51 | // For example: If a .vite was present in both our 52 | // source node_modules and the non-store node_modules we don't want to overwrite 53 | // the non-store one. 54 | const unmanaged = await getUnmanagedFiles(storePrefix, files); 55 | const managed = new Set(files.filter((file) => ! unmanaged.includes(file))); 56 | 57 | const sourceFiles = await fs.promises.readdir(sourceModules); 58 | await Promise.all( 59 | sourceFiles.map(async (file) => { 60 | const sourcePath = path.join(sourceModules, file); 61 | const targetPath = path.join("node_modules", file); 62 | 63 | // Skip file if it's not a symlink to a store path 64 | if (unmanaged.includes(file)) { 65 | console.log(`'${targetPath}' exists, cowardly refusing to link.`); 66 | return; 67 | } 68 | 69 | // Don't unlink this file, we just wrote it. 70 | managed.delete(file); 71 | 72 | // Link to a temporary dummy path and rename. 73 | // This is to get some degree of atomicity. 74 | try { 75 | await fs.promises.symlink(sourcePath, targetPath + "-nix-hook-temp"); 76 | } catch (err) { 77 | if (err.code !== "EEXIST") { 78 | throw err; 79 | } 80 | 81 | await fs.promises.unlink(targetPath + "-nix-hook-temp"); 82 | await fs.promises.symlink(sourcePath, targetPath + "-nix-hook-temp"); 83 | } 84 | await fs.promises.rename(targetPath + "-nix-hook-temp", targetPath); 85 | }) 86 | ); 87 | 88 | // Clean up store symlinks not included in this generation of node_modules 89 | await Promise.all( 90 | Array.from(managed).map((file) => 91 | fs.promises.unlink(path.join("node_modules", file)), 92 | ) 93 | ); 94 | } 95 | 96 | main(); 97 | -------------------------------------------------------------------------------- /tests.nix: -------------------------------------------------------------------------------- 1 | { pkgs ? (let flake = builtins.getFlake (builtins.toString ./.); in flake.inputs.nixpkgs.legacyPackages.${builtins.currentSystem}) 2 | , lib ? pkgs.lib 3 | , testFunc ? lib.debug.runTests 4 | }: 5 | let 6 | inherit (import ./default.nix { inherit pkgs lib; }) fetchModule; 7 | 8 | fixture = lib.importJSON ./fixtures/kitchen_sink/package-lock.json; 9 | getModule = mod: fixture.packages.${mod}; 10 | npmRoot = ./fixtures/kitchen_sink; 11 | inherit (builtins) typeOf baseNameOf; 12 | 13 | in 14 | testFunc { 15 | testFetchHttp = { 16 | expr = 17 | let 18 | src = fetchModule { 19 | module = getModule "node_modules/accepts"; 20 | }; 21 | in 22 | { 23 | inherit (src) url outputHash; 24 | }; 25 | expected = { 26 | outputHash = "sha512-PYAthTa2m2VKxuvSD3DPC/Gy+U+sOA1LAuT8mkmRuvw+NACSaeXEQ+NHcVF7rONl6qcaxV3Uuemwawk+7+SJLw=="; 27 | url = "https://registry.npmjs.org/accepts/-/accepts-1.3.8.tgz"; 28 | }; 29 | }; 30 | 31 | testFetchGit = { 32 | expr = 33 | let 34 | src = fetchModule { 35 | module = getModule "node_modules/node-fetch"; 36 | }; 37 | in 38 | { 39 | inherit (src) rev submodules; 40 | }; 41 | expected = { 42 | rev = "8b3320d2a7c07bce4afc6b2bf6c3bbddda85b01f"; 43 | submodules = false; 44 | }; 45 | }; 46 | 47 | testFetchPath = { 48 | expr = 49 | let 50 | src = fetchModule { 51 | module = getModule "node_modules/trivial"; 52 | inherit npmRoot; 53 | }; 54 | in 55 | { type = typeOf src.outPath; base = baseNameOf src.outPath; }; 56 | expected = { type = "path"; base = "trivial"; }; 57 | }; 58 | } 59 | --------------------------------------------------------------------------------