Added static analysis tooling

.luarc.json

@@ -0,0 +1,13 @@
+{
+  "diagnostics.globals": ["vim"],
+  "diagnostics.severity": {
+    "undefined-global": "Error",
+    "codestyle-check": "Warning"
+  },
+  "workspace.library": [
+    "$VIMRUNTIME/lua",
+    "$VIMRUNTIME/lua/vim/lsp",
+    "~/.local/share/nvim/lazy"
+  ],
+  "workspace.checkThirdParty": "Apply"
+}

devenv.nix

@@ -7,10 +7,13 @@
 }: {
   packages = [
     pkgs.git
+    pkgs.lua-language-server
     pkgs.selene
     pkgs.stylua
   ];
 
+  scripts.typecheck.exec = "lua-language-server --check=. --checklevel=Warning";
+
   languages.lua.enable = true;
 
   git-hooks.hooks = {