feat: nix improvements for modularity (#11032)

This PR improves the flake stack to be more modular, and easy to read, getting ready for a proto tooling inclution

Author: JeancarloBarrios

flake.lock

@@ -1,75 +1,38 @@
 {
-  description = "Agoric SDK Development Environment";
+  description = "Agoric SDK";
 
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
-    flake-utils.url = "github:numtide/flake-utils";
+    unstable-nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    # Track a separate nixpkgs for JS/TS toolchains
+    nixpkgs-js.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-parts = {
+      url = "github:hercules-ci/flake-parts";
+      inputs.nixpkgs-lib.follows = "nixpkgs";
+    };
   };
 
-  outputs = { self, nixpkgs, flake-utils }:
-    flake-utils.lib.eachDefaultSystem (system:
-      let
-        pkgs = nixpkgs.legacyPackages.${system};
-               # Custom Node.js 20.9.0 package
-        custom_node_20_9 = pkgs.stdenv.mkDerivation {
-          pname = "nodejs";
-          version = "20.9.0";
-          
-          src = pkgs.fetchurl {
-            url = "https://nodejs.org/dist/v20.9.0/node-v20.9.0-${if pkgs.stdenv.isDarwin then "darwin" else "linux"}-${if pkgs.stdenv.isAarch64 then "arm64" else "x64"}.tar.gz";
-            sha256 = if pkgs.stdenv.isDarwin && pkgs.stdenv.isAarch64 then
-              "0snfsz2mmjdavi38nglayw5yia74q9h1xzz2ahpri8yqx1md9lii" # darwin-arm64
-            else if pkgs.stdenv.isDarwin then
-              "1j6cw6i3hjqv8zk1nbsqg560k7rgcmyl9cfd4vlvn5wclzr76nzw" # darwin-x64
-            else if pkgs.stdenv.isAarch64 then
-              "0skah3bal5irvramnfn86vgi0c375ywsyb4xaxmx3gvlnbpdp9yj" # linux-arm64
-            else if (pkgs.stdenv.isLinux && !pkgs.stdenv.isAarch64) then
-              "0q3gy4z5b8dd0w37ya5wlkbv4xhyqa1s0zwh71258x5z5w4rz4gh" # linux-x64
-            else
-              throw "Unsupported system: This derivation only supports Linux (x64/arm64) and Darwin (x64/arm64) systems";
-          };
+  outputs = inputs @ { self, nixpkgs, flake-parts, ... }:
+    flake-parts.lib.mkFlake { inherit inputs; } {
+      systems = [
+        "x86_64-linux"
+        "aarch64-linux"
+        "aarch64-darwin"
+        "x86_64-darwin"
+      ];
+      
+      imports = [
+        ./nix/nodejs.nix
+        ./nix/devShell.nix
+      ];
 
-          installPhase = ''
-              echo "installing nodejs"
-              mkdir -p $out
-              cp -r ./ $out/
-            '';
-
-
-          # Meta information for the package
-          meta = with pkgs.lib; {
-            description = "Node.js 20.9.0 JavaScript runtime";
-            homepage = "https://nodejs.org";
-            license = licenses.mit;
-            platforms = platforms.unix;
-          };
+      perSystem = { self', pkgs, system, ... }:
+        let
+          unstablePkgs = import inputs.nixpkgs-unstable { inherit system; };
+        in
+        {
+          # Your minimal perSystem config
         };
-      in
-      {
-        devShells.default = pkgs.mkShell {
-          buildInputs = with pkgs; [
-            custom_node_20_9
-            (yarn.override { nodejs = custom_node_20_9; })
-            (python3.withPackages (ps: [ ps.distutils ]))
-            pkg-config
-            go_1_23
-            gopls
-            delve
-            gcc
-            gnumake
-            protobuf
-            buf
-            git
-          ];
+    };
 
-          shellHook = ''
-            export PATH=$PATH:$HOME/go/bin
-
-            echo "Node.js $(node --version)"
-            echo "NPM $(npm --version)"
-            echo "Yarn using Node.js $(yarn node -v)"
-          '';
-        };
-      }
-    );
 }

flake.nix

@@ -0,0 +1,36 @@
+{ self', inputs, ... }: {
+  perSystem = { system, pkgs, nodePkgs, ... }:
+  let
+    unstablePkgs = import inputs.unstable-nixpkgs { inherit system; };
+  in
+  {
+    devShells.default = pkgs.mkShell {
+      name = "agoric-devShell";
+      buildInputs = with unstablePkgs; [
+        git
+        go_1_23
+        gopls
+        (python3.withPackages (ps: [ ps.distutils ]))
+        pkg-config
+        go-tools
+        gotools
+        delve
+        gcc
+        gnumake
+        protobuf
+        buf
+      ] ++ (with nodePkgs; [
+        nodejs
+        yarn
+      ]);
+
+      shellHook = ''
+        export PATH=$PATH:$HOME/go/bin
+
+        echo "Node.js $(node --version)"
+        echo "NPM $(npm --version)"
+        echo "Yarn using Node.js $(yarn node -v)"
+      '';
+    };
+  };
+}

nix/devShell.nix

@@ -0,0 +1,18 @@
+{ self', inputs, ... }: {
+  perSystem = { system, ... }: {
+    # Define a new module argument that other modules can use
+    _module.args.nodePkgs = import inputs.nixpkgs-js {
+      inherit system;
+      
+      # Add custom overlay for Node.js
+      overlays = [
+        (final: prev: {
+          nodejs = prev.nodejs_20;
+          yarn = prev.yarn.override { 
+            nodejs = prev.nodejs_20;
+          };
+        })
+      ];
+    };
+  };
+}