Dartls is Extremely Slow when inserting a new line

[ghost]

Description

Hello.

---

I have not been using Nvim-lspconfig because I used the Mason, especially Mason-Lspconfig, as a LSP configuration tool. Of course, Mason provides nice UIs and many features for handling the language server protocols that are manipulated by Nvim-Lspconfig. (It it is not true, let me know)

However, Mason started not providing Dartls lsp for some reason. So, I started using Nvim-lspconfig directly to setup the environment for Dart, not through Mason. This is the lua file for configuring Mason. And this part is where I set the Dartls directly.

---

How I installed Dart

I want to share how I installed Dart because this might have been the problem.

1. Open this website.
2. Run the following commands.
   • Installing Homebrew.
     • I added export PATH=/opt/homebrew/bin:$PATH to ~/.zshrc and ~/.bashrc because I had this problem.
   • brew tap dart-lang/dart
   • brew install dart

The below log is what I could see when I run brew info dart.

==> dart-lang/dart/dart: stable 3.1.1, HEAD
SDK
https://dart.dev
Conflicts with:
  dart-beta (because dart-beta ships the same binaries)
/opt/homebrew/Cellar/dart/3.1.1 (987 files, 554.4MB) *
  Built from source on 2023-09-09 at 22:06:13
From: https://github.com/dart-lang/homebrew-dart/blob/HEAD/Formula/dart.rb
==> Options
--HEAD
	Install HEAD version
==> Caveats
Please note the path to the Dart SDK:
  /opt/homebrew/opt/dart/libexec

---

Dart Version - dart --version

Dart SDK version: 3.1.1 (stable) (Tue Sep 5 12:20:14 2023 +0000) on "macos_arm64"

---

Like I mentioned, Mason provides countless features for handling the lsps that are manipulated by Nvim-Lspconfig. That is also the reason why I do not know where this problem happens. I thought I had this problem because my computer has problems that I do not know, so I reseted(like, factory reset) my computer but the problem remains.

Neovim version

NVIM v0.9.1
Build type: Release
LuaJIT 2.1.0-beta3

Nvim-lspconfig version

93c6826

Operating system and version

macOS Ventura 13.5.1

Affected language servers

dartls

Steps to reproduce

1. Setup Dartls through lspconfig.

-- Dart Setting
require 'lspconfig'.dartls.setup {
  cmd = { "dart", "language-server", "--protocol=lsp" },
  filetypes = { "dart" },
  init_options = {
    closingLabels = true,
    flutterOutline = true,
    onlyAnalyzeProjectsWithOpenFiles = true,
    outline = true,
    suggestFromUnimportedLibraries = true
  },
  settings = {
    dart = {
      completeFunctionCalls = true,
      showTodos = true
    }
  },
}

2. Open any dart file. something.dart. The file should be in the folder that has pubspec.yaml.
3. Type something in Dart, and press Enter
4. You will be waiting for a few seconds to just insert.

Actual behavior

Every time I insert a new line in any types of Dart file, it takes a few seconds without doing anything(maybe it is calculating or something...?).

Expected behavior

What I expect it to do is to NOT take a few seconds every time I insert a new line obviously. Think what happen when you code in TypeScript, does it freeze when you type enter? No. However, it does for some reason.

Minimal config

local on_windows = vim.loop.os_uname().version:match 'Windows'

local function join_paths(...)
  local path_sep = on_windows and '\\' or '/'
  local result = table.concat({ ... }, path_sep)
  return result
end

-- vim.cmd [[set runtimepath=$VIMRUNTIME]]

local temp_dir = vim.loop.os_getenv 'TEMP' or '/tmp'

vim.cmd('set packpath=' .. join_paths(temp_dir, 'nvim', 'site'))
vim.lsp.set_log_level('debug')

local package_root = join_paths(temp_dir, 'nvim', 'site', 'pack')
local lspconfig_path = join_paths(package_root, 'test', 'start', 'nvim-lspconfig')

if vim.fn.isdirectory(lspconfig_path) ~= 1 then
  vim.fn.system { 'git', 'clone', 'https://github.com/neovim/nvim-lspconfig', lspconfig_path }
end

-- vim.lsp.set_log_level 'trace'
require('vim.lsp.log').set_format_func(vim.inspect)

local nvim_lsp = require 'lspconfig'
local on_attach = function(_, bufnr)
  local function buf_set_option(...)
    vim.api.nvim_buf_set_option(bufnr, ...)
  end

  buf_set_option('omnifunc', 'v:lua.vim.lsp.omnifunc')

  -- Mappings.
  local opts = { buffer = bufnr, noremap = true, silent = true }
  vim.keymap.set('n', 'gD', vim.lsp.buf.declaration, opts)
  vim.keymap.set('n', 'gd', vim.lsp.buf.definition, opts)
  vim.keymap.set('n', 'K', vim.lsp.buf.hover, opts)
  vim.keymap.set('n', 'gi', vim.lsp.buf.implementation, opts)
  vim.keymap.set('n', '<C-k>', vim.lsp.buf.signature_help, opts)
  vim.keymap.set('n', '<space>wa', vim.lsp.buf.add_workspace_folder, opts)
  vim.keymap.set('n', '<space>wr', vim.lsp.buf.remove_workspace_folder, opts)
  vim.keymap.set('n', '<space>wl', function()
    print(vim.inspect(vim.lsp.buf.list_workspace_folders()))
  end, opts)
  vim.keymap.set('n', '<space>D', vim.lsp.buf.type_definition, opts)
  vim.keymap.set('n', '<space>rn', vim.lsp.buf.rename, opts)
  vim.keymap.set('n', 'gr', vim.lsp.buf.references, opts)
  vim.keymap.set('n', '<space>e', vim.diagnostic.open_float, opts)
  vim.keymap.set('n', '[d', vim.diagnostic.goto_prev, opts)
  vim.keymap.set('n', ']d', vim.diagnostic.goto_next, opts)
  vim.keymap.set('n', '<space>q', vim.diagnostic.setloclist, opts)
end

-- Add the server that troubles you here
local name = 'dartls'
local cmd = { "dart", "language-server", "--protocol=lsp" } -- needed for elixirls, lua_ls, omnisharp
nvim_lsp[name].setup {
  cmd = cmd,
  on_attach = on_attach,
}

LSP log

https://gist.github.com/cattynip/20b938c15e2c20625fadada5837d0202

[ghost]

The reason why I commented vim.cmd [[set runtimepath=$VIMRUNTIME]] is that it makes an error with the theme TokyoNight that I have been using if I enable it. However, when I enabled that and disabled the TokyoNight, taking a few seconds did not happen.

[justinmk]

Can't debug your config for you. This repo is just a set of configs, not a support channel.

[themosthigh]

I fixed it by removing dart from my treesitter ensure_installed options and deleting all my parsers (i only needed to delete the dart.so)

TreeSitter is the problem, not the dart lsp

[ghost]

Oh, thank you. It is working well right now.

[AlexMeuer]

Specifically, it appears to be the indentation behaviour of the treesitter. You can check this by disabling indent for the current buffer with :TSBufDisable indent

[Andresdiaz16]

I fixed this issue by adding the follow line to my Treesitter setup:
indent = { enable = true, disable = {'dart'} },

[themosthigh]

I thinks this issue has finally been fixed

[ghost]

Nice!