feat(nix): write a working nix flake

flake.lock

@@ -1,5 +1,23 @@
 {
   "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1705309234,
+        "narHash": "sha256-uNRRNRKmJyCRC/8y1RqBkqWBLM034y4qN7EprSdmgyA=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "1ef2e671c3b0c19053962c07dbda38332dcebf26",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1708566995,
@@ -18,8 +36,24 @@
     },
     "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",

flake.nix

@@ -3,19 +3,45 @@
 
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-23.11";
+    flake-utils.url = "github:numtide/flake-utils";
   };
 
-  outputs = { self, nixpkgs }:
+  outputs = { self, nixpkgs, flake-utils }: flake-utils.lib.eachDefaultSystem (system:
-  let
+    let
-    system = "x86_64-linux";
+      system = "x86_64-linux";
-    pkgs = nixpkgs.legacyPackages.${system};
+      pkgs = nixpkgs.legacyPackages.${system};
-  in
+      packageName = "comfycamp";
-  {
+    in
-    devShells.${system}.default = pkgs.mkShell {
+    {
-      buildInputs = [
+      devShells.default = pkgs.mkShell {
-        pkgs.nodejs_20
+        buildInputs = [
-        pkgs.imagemagick
+          pkgs.nodejs_20
-      ];
+          pkgs.imagemagick
-    };
+        ];
-  };
+      };
+
+
+      packages.${packageName} = pkgs.buildNpmPackage {
+        name = "${packageName}";
+
+        src = ./.;
+        npmDepsHash = "sha256-Nprdi+LX7/fSnrxeJzkbHX13FKM172E8wy6L+nxC/iE=";
+
+        buildInputs = [
+          pkgs.nodejs_20
+          pkgs.vips            # required by sharp
+        ];
+        nativeBuildInputs = [
+          pkgs.pkg-config      # required by sharp
+        ];
+        installPhase = ''
+          mkdir $out
+          npm run build
+          cp -r dist/* $out
+        '';
+      };
+
+      defaultPackage = self.packages.${system}.${packageName};
+    }
+  );
 }