build: add nix

.envrc

@@ -0,0 +1,7 @@
+if type -P lorri &>/dev/null; then
+  echo 'direnv using lorri'
+  eval "$(lorri direnv)"
+else
+  echo 'direnv using nix-direnv'
+  use nix
+fi

default.nix

@@ -0,0 +1,22 @@
+{ pkgs ? import <nixpkgs> {}, lib ? pkgs.lib }:
+let 
+    package = builtins.fromJSON (builtins.readFile ./package.json);
+in
+pkgs.buildNpmPackage rec {
+  pname = package.name;
+  version = package.version;
+
+  src = ./.;
+
+  npmDepsHash = "sha256-R06AIzbXKud5cFYAn1hsuOndSu20s59eRMkwjNQynXA=";
+
+  # The prepack script runs the build script, which we'd rather do in the build phase.
+  npmPackFlags = [ "--ignore-scripts" ];
+
+  meta = with lib; {
+    description = package.description;
+    homepage = package.homepage;
+    license = builtins.getAttr (toLower package.license) licenses;
+    maintainers = with maintainers; [ nyx ];
+  };
+}

flake.lock

@@ -0,0 +1,60 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1685518550,
+        "narHash": "sha256-o2d0KcvaXzTrPRIo0kOLV0/QXHhDQ5DTi+OxcjO8xqY=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "a1720a10a6cfe8234c0e93907ffe81be440f4cef",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1686596538,
+        "narHash": "sha256-kw7+Br/nNOHwmYG0lxMvMbWG0BE2meypCmyjijbb5yI=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "eb6e16e3c5d77c5a80edc1731ac53e5e040d6044",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,16 @@
+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/23.05";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+      in
+      {
+        devShells.default = import ./shell.nix { inherit pkgs; };
+      }
+    );
+}

shell.nix

@@ -0,0 +1,15 @@
+{ pkgs ? import <nixpkgs> {}, lib ? pkgs.lib }:
+let
+  NPM_CONFIG_PREFIX = toString ./npm_config_prefix;
+in pkgs.mkShell {
+  packages = with pkgs; [
+    nodejs_18
+    nodePackages.npm
+  ];
+
+  inherit NPM_CONFIG_PREFIX;
+
+  shellHook = ''
+    export PATH="${NPM_CONFIG_PREFIX}/bin:$PATH"
+  '';
+}