add flutter env

flake.nix

@@ -0,0 +1,33 @@
+{
+  description = "FabApp";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/release-22.11";
+    flake-parts.url = "github:hercules-ci/flake-parts";
+  };
+
+  outputs = inputs@{ flake-parts, nixpkgs, ... }:
+    flake-parts.lib.mkFlake { inherit inputs; } {
+      flake = {
+        # Put your original flake attributes here.
+      };
+
+      systems = [ "x86_64-linux" ];
+
+      # https://flake.parts/module-arguments.html#persystem-module-parameters
+      perSystem = { pkgs, system, ... }: {
+        _module.args.pkgs = import nixpkgs {
+          inherit system;
+          config.allowUnfree = true;
+        };
+
+        devShells.default = with pkgs;
+          let
+            vscodeCustom = pkgs.vscode-with-extensions.override {
+              vscodeExtensions = with pkgs.vscode-extensions;
+                [ dart-code.flutter ];
+            };
+          in mkShell { buildInputs = [ just flutter vscodeCustom ]; };
+      };
+    };
+}