From afc1db95e068d7c088eb27b437cf94b8f20b846c Mon Sep 17 00:00:00 2001
From: nelind <nel.n.lindberg@gmail.com>
Date: Wed, 28 Jan 2026 17:18:38 +0100
Subject: [PATCH] feat(nix): derivation for frontend

---
 flake.lock   | 19 ++++++++++++++-
 flake.nix    | 21 +++++++++++++----
 frontend.nix | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 100 insertions(+), 6 deletions(-)
 create mode 100644 frontend.nix

diff --git a/flake.lock b/flake.lock
index 1c499aa..8345151 100644
--- a/flake.lock
+++ b/flake.lock
@@ -16,9 +16,26 @@
         "type": "github"
       }
     },
+    "nixpkgs-fetch-deno": {
+      "locked": {
+        "lastModified": 1766410835,
+        "narHash": "sha256-dRhVt0aFDyTqppyzRLxiO1JZEAoIA2fUnaeyJTe+UwU=",
+        "owner": "aMOPel",
+        "repo": "nixpkgs",
+        "rev": "c9801acc8c4fac6377d076bc1c102b15bd9cfa6f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "aMOPel",
+        "ref": "feat/fetchDenoDeps",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": "nixpkgs",
+        "nixpkgs-fetch-deno": "nixpkgs-fetch-deno"
       }
     }
   },
diff --git a/flake.nix b/flake.nix
index 5dd1449..99202f9 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,18 +1,29 @@
 {
-  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
-  outputs = { self, nixpkgs, ... }: let
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+
+    # tranquil frontend uses deno as its package manager and build time runtime.
+    # nixpkgs does not have deno support yet but its being worked on in https://github.com/NixOS/nixpkgs/pull/419255
+    # for now we important that PR as well purely for its fetchDenoDeps
+    nixpkgs-fetch-deno.url = "github:aMOPel/nixpkgs/feat/fetchDenoDeps";
+  };
+  
+  outputs = { self, nixpkgs, ... } @ inputs : let
     forAllSystems =
       function:
       nixpkgs.lib.genAttrs nixpkgs.lib.systems.flakeExposed (
-        system: function nixpkgs.legacyPackages.${system}
+        system: (function system nixpkgs.legacyPackages.${system})
       );
   in {
-    packages = forAllSystems (pkgs: {
+    packages = forAllSystems (system: pkgs: {
       tranquil-pds = pkgs.callPackage ./default.nix { };
+      tranquil-frontend = pkgs.callPackage ./frontend.nix {
+        inherit (inputs.nixpkgs-fetch-deno.legacyPackages.${system}) fetchDenoDeps;
+      };
       default = self.packages.${pkgs.stdenv.hostPlatform.system}.tranquil-pds;
     });
 
-    devShells = forAllSystems (pkgs: {
+    devShells = forAllSystems (system: pkgs: {
       default = pkgs.callPackage ./shell.nix { };
     });
   };
diff --git a/frontend.nix b/frontend.nix
new file mode 100644
index 0000000..97c2493
--- /dev/null
+++ b/frontend.nix
@@ -0,0 +1,66 @@
+{
+  lib,
+  stdenvNoCC,
+  
+  fetchDenoDeps,
+  fetchFromGitHub,
+  
+  buildGoModule,
+
+  deno,
+  esbuild,
+}: let
+  toml = (lib.importTOML ./Cargo.toml).workspace.package;
+  deno-deps = fetchDenoDeps {
+    pname = "tranquil-frontend-deno-deps";
+    denoLock = ./frontend/deno.lock;
+    hash = "sha256-UB+E00TjWX0fTUZ7XwcwRJ/OUOSSJpz6Ss04U5i8dGI=";
+  };
+  # the esbuild in upstream nixpkgs is too old.
+  esbuild' = esbuild.override {
+    buildGoModule = args: buildGoModule (
+      args // (
+        let
+          version = "0.27.2";
+        in {
+          inherit version;
+          src = fetchFromGitHub {
+            owner = "evanw";
+            repo = "esbuild";
+            tag = "v${version}";
+            hash = "sha256-JbJB3F1NQlmA5d0rdsLm4RVD24OPdV4QXpxW8VWbESA";
+          };
+          vendorHash = "sha256-+BfxCyg0KkDQpHt/wycy/8CTG6YBA/VJvJFhhzUnSiQ";
+        }
+      )
+    );
+  };
+in stdenvNoCC.mkDerivation {
+    pname = "tranquil-frontend";
+    inherit (toml) version;
+    
+    src = ./frontend;
+
+    nativeBuildInputs = [
+      deno
+    ];
+    # tell vite (through the esbuild api) where the nix provided esbuild binary is
+    env.ESBUILD_BINARY_PATH = lib.getExe esbuild';
+
+    buildPhase = ''
+      # copy the deps to the required location
+      cp -r --no-preserve=mode ${deno-deps.denoDeps}/.deno ./
+      cp -r --no-preserve=mode ${deno-deps.denoDeps}/vendor ./
+
+      pwd
+      ls /build/frontend/vendor
+
+      # Now you can run the project using deps
+      # you need to activate [deno's vendor feature](https://docs.deno.com/runtime/fundamentals/modules/#vendoring-remote-modules)
+      # you need to use the `$DENO_DIR` env var, to point deno to the correct local cache
+      DENO_DIR=./.deno deno run --frozen --cached-only build
+    '';
+    installPhase = ''
+      cp -r ./dist $out
+    '';
+}