Add idx support (#230)

.idx/dev.nix

@@ -0,0 +1,37 @@
+{pkgs}: {
+
+  # Which nixpkgs channel to use.
+  channel = "stable-23.05"; # or "unstable"
+
+  # Use https://search.nixos.org/packages to  find packages
+  packages = [
+    pkgs.nodejs_18
+    pkgs.cacert 
+    pkgs.openssh 
+    pkgs.fakeroot
+  ];
+
+  # search for the extension on https://open-vsx.org/ and use "publisher.id"
+  idx.extensions = [
+    "ms-vscode.js-debug"
+    "dbaeumer.vscode-eslint"
+    "esbenp.prettier-vscode"
+  ];
+
+    idx.previews = {
+    enable = true;
+    previews = [
+      {
+        command = [
+          "npm"
+          "start"
+          "--"
+          "--port"
+          "$PORT"
+        ];
+        manager = "web";
+        id = "web";
+      }
+    ];
+  };
+}