`dartls` not found in mason-registry

[taham8875]

Hi there

I'm setting up Neovim with nvim-lspconfig, and I'm getting an issue when trying to enable the Dart language server (dartls). When I start Neovim, I get the following error:

.../share/nvim/lazy/mason.nvim/lua/mason-registry/init.lua:80: Cannot find package "dartls"

Here's what I’ve done so far:

• I’m using mason.nvim and mason-lspconfig.nvim to manage language servers.
• I have not manually installed dartls but expected it to be installed automatically as part of my setup.
• I checked the Mason package registry and couldn’t find a dartls package listed (so this is the problem, Mason can not recognize that something called dartls exists).

I am using kickstart, take a look here at their setup, I added dartls as it is the one that can be found after running :help lspconfig-all:

https://github.com/nvim-lua/kickstart.nvim/blob/e947649cb0ee5ac3c75593288df04d4f58359106/init.lua#L671

So any suggestions on how to make this run

Note: For me, I realized that I can manually setup dart lsp to work without need to use mason-lspconfig by using this code:

require("lspconfig").dartls.setup({
	cmd = { "path/to/dart", "language-server", "--protocol=lsp" },
	filetypes = { "dart" },
	init_options = {
		closinglabels = true,
		flutteroutline = true,
		onlyanalyzeprojectswithopenfiles = true,
		outline = true,
		suggestfromunimportedlibraries = true,
	},
	-- root_dir = root_pattern("pubspec.yaml"),
	settings = {
		dart = {
			completefunctioncalls = true,
			showtodos = true,
		},
	},
	on_attach = function(client, bufnr)
	end,
})

But I am making this issue for future users how want to use mason-lspconfig without manually doing this.

[owenmedina]

Experiencing the asme thing

[owenmedina]

This worked for me. I'm using kickstart.nvim.

{
    -- Main LSP Configuration
    'neovim/nvim-lspconfig',
    dependencies = {
      -- Automatically install LSPs and related tools to stdpath for Neovim
      -- Mason must be loaded before its dependents so we need to set it up here.
      -- NOTE: `opts = {}` is the same as calling `require('mason').setup({})`
      { 'williamboman/mason.nvim', opts = {} },
      'williamboman/mason-lspconfig.nvim',
      'WhoIsSethDaniel/mason-tool-installer.nvim',

      -- Useful status updates for LSP.
      { 'j-hui/fidget.nvim', opts = {} },

      -- Allows extra capabilities provided by nvim-cmp
      'hrsh7th/cmp-nvim-lsp',
    },
    config = function()
      ...

      require('lspconfig').dartls.setup {
        on_attach = function(client, bufnr)
          -- Your custom LSP key mappings and on_attach logic for dartls
          local map = function(keys, func, desc)
            vim.keymap.set('n', keys, func, { buffer = bufnr, desc = desc })
          end
          -- Add specific key mappings for dartls if needed
          map('gd', vim.lsp.buf.definition, '[G]oto [D]efinition')
          -- Add other dartls specific key mappings here if needed
        end,
     }
    end,
}