Updated things, following TJ Devries advent of Neovim.

lua/config/lazy.lua

@@ -0,0 +1,14 @@
+local lazypath = vim.fn.stdpath("data") .. "/lazy/lazy.nvim"
+if not vim.loop.fs_stat(lazypath) then
+  vim.fn.system({
+    "git",
+    "clone",
+    "--filter=blob:none",
+    "https://github.com/folke/lazy.nvim.git",
+    "--branch=stable",
+    lazypath,
+  })
+end
+vim.opt.rtp:prepend(lazypath)
+
+require("lazy").setup("plugins") 

lua/plugins/nvim-treesitter.lua

@@ -5,7 +5,7 @@ return {{
       local configs = require("nvim-treesitter.configs")
 
       configs.setup({
-          ensure_installed = { "c", "cpp", "lua", "vim", "vimdoc", "python", "html", "gdscript", "odin" },
+          ensure_installed = { "c", "cpp", "lua", "vim", "vimdoc", "python", "html", "gdscript", "odin" , "dart"},
           sync_install = false,
           highlight = { enable = true },
           indent = { enable = true, }, --disable = { "gdscript"} },