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Add nextjs project example
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(Add example how to build nodePackages with different nodejs version - see https://discourse.nixos.org/t/how-to-use-pnpm-with-recent-nodejs/21867/4?u=tennox)
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</syntaxhighlight>
</syntaxhighlight>


See <code>nix search nodejs</code> for additional versions like <code>nodejs-12_x</code>, etc.
See <code>nix search nixpkgs nodejs</code> for additional versions like <code>nodejs-12_x</code>, etc.


== Packaging ==
== Packaging ==
=== Package with yarn2nix ===
=== Packaging with <code>buildNpmPackage</code> ===
From the [https://nixos.org/manual/nixpkgs/stable/#javascript-tool-specific Nixpkgs manual]: "<code>buildNpmPackage</code> allows you to package npm-based projects in Nixpkgs without the use of an auto-generated dependencies file (as used in node2nix). It works by utilizing npm’s cache functionality – creating a reproducible cache that contains the dependencies of a project, and pointing npm to it."
 
'''To better understand what happens under the hood and see the latest features see'''
 
https://github.com/NixOS/nixpkgs/blob/master/pkgs/build-support/node/build-npm-package/default.nix
 
==== Packaging electron applications ====
When trying to <code>npm i</code> electron, by default electron will try to download binaries from the internet, which does not work in the Nix sandbox. To stop it from trying to access the internet, set the environment variable <code>ELECTRON_SKIP_BINARY_DOWNLOAD = "1";</code>.
 
For examples of packaging electron applications, search [https://github.com/search?q=buildNpmPackage+electron+repo%3ANixOS%2Fnixpkgs&type=code&l=NixOS%2Fnixpkgs Nixpkgs] for the terms "buildNpmPackage" and "electron".
 
=== Packaging with <code>yarn2nix</code> ===
yarn2nix uses the yarn nodejs tool to create a file called yarn.lock, which in return can be used by yarn2nix to generate a usable yarn expression.
yarn2nix uses the yarn nodejs tool to create a file called yarn.lock, which in return can be used by yarn2nix to generate a usable yarn expression.
This is what was needed to convert a small application server  [https://git.shackspace.de/rz/muellshack/tree/3be09715911628b164fa1cf346387555ca26a5b1 shackspace muellshack]:
This is what was needed to convert a small application server  [https://git.shackspace.de/rz/muellshack/tree/3be09715911628b164fa1cf346387555ca26a5b1 shackspace muellshack]:
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</pre>


One quick workaround for this is [https://nixos.wiki/wiki/Steam#steam-run to use <code>steam-run</code>] to provide a placeholder FHS environment that *should* work; e.g. for the Cypress example above:
One quick workaround for this is [[Steam#FHS environment only| to use <code>steam-run</code>]] to provide a placeholder FHS environment that *should* work; e.g. for the Cypress example above:


<pre>
<pre>
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(Inspired by [https://discourse.nixos.org/t/how-to-make-nixos-so-easy-that-people-can-be-productive-up-front-without-having-to-first-learn-the-nix-language/5625 this discussion on discourse.nixos.org])
(Inspired by [https://discourse.nixos.org/t/how-to-make-nixos-so-easy-that-people-can-be-productive-up-front-without-having-to-first-learn-the-nix-language/5625 this discussion on discourse.nixos.org])
'''Google-fonts fetch failure with NextJS'''
Nextjs is a popular React framework and comes with built-in support with support for Google fonts. If a NPM project uses it, <syntaxhighlight lang="shell">
npm run build # which calls "next build"
</syntaxhighlight>will try to fetch and optimize the Google fonts during a  nix build run, which will fail in Nix's isolated sandbox without internet:<syntaxhighlight lang="shell">
...
Running phase: buildPhase
Executing npmBuildHook
> nextjs-ollama-local-ai@0.1.0 build
> next build
  ▲ Next.js 14.1.0
  Creating an optimized production build ...
request to https://fonts.googleapis.com/css2?family=Inter:wght@100..900&display=swap failed, reason: getaddrinfo EAI_AGAIN fonts.googleapis.com
    at ClientRequest.<anonymous> (/build/source/node_modules/next/dist/compiled/node-fetch/index.js:1:66160)
    at ClientRequest.emit (node:events:518:28)
    at TLSSocket.socketErrorListener (node:_http_client:500:9)
    at TLSSocket.emit (node:events:518:28)
    at emitErrorNT (node:internal/streams/destroy:169:8)
    at emitErrorCloseNT (node:internal/streams/destroy:128:3)
    at process.processTicksAndRejections (node:internal/process/task_queues:82:21) {
  type: 'system',
  errno: 'EAI_AGAIN',
  code: 'EAI_AGAIN'
}
Failed to compile.
src/app/layout.tsx
`next/font` error:
Failed to fetch `Inter` from Google Fonts.
> Build failed because of webpack errors
ERROR: `npm build` failed
</syntaxhighlight>You have to patch the Javascript code <syntaxhighlight lang="javascript">
# In layout.tsx file replace
#
# import {Inter} from "next/font/google"; #or any other Google font like Inter
# const inter = Inter({ subsets: ["latin"] });
#
# with ("src:" must be relative to the src/app/layout.tsx file):
import localFont from "next/font/local";
const inter = localFont({ src: './Inter.ttf' });
</syntaxhighlight>and place the Google fonts from Nixpkgs into the project, e.g. in a <code>preBuild</code> phase:<syntaxhighlight lang="nix">
buildNpmPackage {
  pname = "myproject";
  version = "1.0.0";
  ...
  # see https://github.com/NixOS/nixpkgs/blob/master/pkgs/by-name/cr/crabfit-frontend/package.nix
  preBuild = ''
    cp "${
      google-fonts.override { fonts = [ "Inter" ]; }
    }/share/fonts/truetype/Inter[slnt,wght].ttf" src/app/Inter.ttf
  '';
  ...
}
</syntaxhighlight>You can take a look at what fonts are available in the Nix <code>google-fonts</code> package by calling:<syntaxhighlight lang="shell">
ls -ahl $(nix build --no-link --print-out-paths nixpkgs#google-fonts)/share/fonts/truetype/
</syntaxhighlight>Take a look at https://github.com/NixOS/nixpkgs/blob/master/pkgs/servers/homepage-dashboard/default.nix for further workarounds for Nextjs in Nix.


== Example nix shell for Node.js development ==
== Example nix shell for Node.js development ==
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let
let
   lib = import <nixpkgs/lib>;
   lib = import <nixpkgs/lib>;
   buildNodeJs = pkgs.callPackage <nixpkgs/pkgs/development/web/nodejs/nodejs.nix> {};
   buildNodeJs = pkgs.callPackage "${<nixpkgs>}/pkgs/development/web/nodejs/nodejs.nix" {
    python = pkgs.python3;
  };


   nodejsVersion = lib.fileContents ./.nvmrc;
   nodejsVersion = lib.fileContents ./.nvmrc;
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     export PATH="${NPM_CONFIG_PREFIX}/bin:$PATH"
     export PATH="${NPM_CONFIG_PREFIX}/bin:$PATH"
   '';
   '';
}
</syntaxhighlight>
== Example nix flake shell for Node.js development ==
`flake.nix` example:
<syntaxhighlight lang="nix>
{
  description = "example-node-js-flake";
  inputs = {
    flake-utils.url = "github:numtide/flake-utils";
  };
  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs {
          inherit system;
        };
        buildNodeJs = pkgs.callPackage "${<nixpkgs>}/pkgs/development/web/nodejs/nodejs.nix" {
          python = pkgs.python3;
        };
        nodejs = buildNodeJs {
          enableNpm = true;
          version = "20.5.1";
          sha256 = "sha256-Q5xxqi84woYWV7+lOOmRkaVxJYBmy/1FSFhgScgTQZA=";
        };
      in rec {
        flakedPkgs = pkgs;
        # enables use of `nix shell`
        devShell = pkgs.mkShell {
          # add things you want in your shell here
          buildInputs = with pkgs; [
            nodejs
          ];
        };
      }
    );
}
}


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