advanced-nixd-settings.jsonc

{
  // nixd configuration documentation :
  // https://github.com/nix-community/nixd/blob/main/nixd/docs/configuration.md#configuration-overview 
  "nix.enableLanguageServer": true,
  "nix.serverPath": "nixd",
  "nix.serverSettings": {
    "nixd": {
      "formatting": {
        "command": ["nixfmt"],
      },
      "options": {
        // By default, this entry will be read from `import <nixpkgs> { }`.
        // You can write arbitrary Nix expressions here, to produce valid "options" declaration result.
        // Tip: for flake-based configuration, utilize `builtins.getFlake`
        "nixos": {
          "expr": "(builtins.getFlake \"/absolute/path/to/flake\").nixosConfigurations.<name>.options",
        },
        "home-manager": {
          "expr": "(builtins.getFlake \"/absolute/path/to/flake\").homeConfigurations.<name>.options",
        },
        // Tip: use ${workspaceFolder} variable to define path
        "nix-darwin": {
          "expr": "(builtins.getFlake \"${workspaceFolder}/path/to/flake\").darwinConfigurations.<name>.options",
        },
      },
    },
  },
}