[BUG] nvim-lspconfig default configuration missing for eslint

[IMax153]

Description

For certain LSPs, the defaults from nvim-lspconfig seem to be missing, resulting in problems attaching the LSP to applicable buffers.

For example, setting plugins.lsp.servers.eslint.enable = true, I get an error in the LspLog related to a missing cmd:

[ERROR][2025-04-26 08:39:54] .../lua/vim/lsp.lua:455	"cannot start eslint due to config error: ...ovim-unwrapped-0.11.0/share/nvim/runtime/lua/vim/lsp.lua:444: cmd: expected expected function or table with executable command, got nil"

More detail on the issue can be found in the comments of #3217.

Additional Information

Output of :checkhealth vim.lsp

lsp-health.txt

Output of nixvim-print-init

init.lua.txt

Note - GitHub seemingly would not allow upload of a Lua file, so I had to append .txt to the filename.

Output of nix-repl

:p packages.aarch64-darwin.default.config.extraPlugins

nix-repl> :p packages.aarch64-darwin.default.config.extraPlugins
[
  {
    config = "";
    optional = false;
    plugin = «derivation /nix/store/g1l9s0x3qm1i3sk8cwn7i7q7gs42hr50-vimplugin-nvim-lspconfig-2025-04-19.drv»;
  }
  {
    config = "";
    optional = false;
    plugin = «derivation /nix/store/npd5bcynlh9c4pdcbzz4jf3ks7ny3ddx-vimplugin-catppuccin-nvim-2025-02-28.drv»;
  }
  {
    config = "";
    optional = false;
    plugin = «derivation /nix/store/p71d9gy7mgk8qc96hk8p7sp93zqrjxfz-vimplugin-luajit2.1-nvim-web-devicons-0.100-1-unstable-0.100-1.drv»;
  }
  {
    config = "";
    optional = false;
    plugin = «derivation /nix/store/247zzzx975xnzqri3jq3373pb1m2nylr-vimplugin-nvim-ts-autotag-2025-02-18.drv»;
  }
  {
    config = "";
    optional = false;
    plugin = «derivation /nix/store/h82hqw1g8p6q4gkqngaj5s9050w0qzya-vimplugin-nvim-treesitter-2025-04-15.drv»;
  }
  {
    config = "";
    optional = false;
    plugin = «derivation /nix/store/ib0z7hjzapkl9qr34dik31md8ppcrnfl-vimplugin-toggleterm.nvim-2025-03-09.drv»;
  }
  {
    config = "";
    optional = false;
    plugin = «derivation /nix/store/0rj0gdsqdj0kfqrdjnz9j0iwpsanq811-vimplugin-tailwind-tools.nvim-2025-04-08.drv»;
  }
  {
    config = "";
    optional = false;
    plugin = «derivation /nix/store/3qsqza63yadkmd1b11wjnsqvz03a0y37-vimplugin-snacks.nvim-2025-03-01.drv»;
  }
  {
    config = "";
    optional = false;
    plugin = «derivation /nix/store/dlpiysv4hf6k1wraphjccnpbf6f40hcl-vimplugin-luajit2.1-oil.nvim-2.15.0-1-unstable-2.15.0-1.drv»;
  }
  {
    config = "";
    optional = false;
    plugin = «derivation /nix/store/52awx56c756sy2hjvyf5lnk29sivlih0-vimplugin-nvim-autopairs-2025-04-13.drv»;
  }
  {
    config = "";
    optional = false;
    plugin = «derivation /nix/store/z2pvdpgv6vb6f3iir4z0j35fa1ynwhlq-vimplugin-nix-develop.nvim-2023-07-23.drv»;
  }
  {
    config = "";
    optional = false;
    plugin = «derivation /nix/store/qnawff2k6ivm8wck3ifvi6nsq0v54i17-vimplugin-vim-nix-2025-02-01.drv»;
  }
  {
    config = "";
    optional = false;
    plugin = «derivation /nix/store/6sh71hrpxd18jkwnj54cknck9qi5vbk2-vimplugin-mini.nvim-2025-04-19.drv»;
  }
  {
    config = "";
    optional = false;
    plugin = «derivation /nix/store/jnh5hmr2l398qf608f0m43cr7h6gcfd7-vimplugin-luajit2.1-luasnip-2.3.0-1-unstable-2.3.0-1.drv»;
  }
  {
    config = "";
    optional = false;
    plugin = «derivation /nix/store/0xfjiv5z8dld49wz92w78ifrvmwz58zg-vimplugin-luajit2.1-lualine.nvim-scm-1-unstable-scm-1.drv»;
  }
  {
    config = "";
    optional = false;
    plugin = «derivation /nix/store/1p5kp5swb79d6zwrcgfv7i3rgw3yiv7w-vimplugin-nvim-lint-2025-04-19.drv»;
  }
  {
    config = "";
    optional = false;
    plugin = «derivation /nix/store/mig63a2qsgsw3rzncqxx3vanl0waamvf-vimplugin-luajit2.1-gitsigns.nvim-scm-1-unstable-scm-1.drv»;
  }
  {
    config = "";
    optional = false;
    plugin = «derivation /nix/store/6vhnfwcmwn5m5p8gp4pk48mh8pjmw2ps-vimplugin-vim-fugitive-2025-02-19.drv»;
  }
  {
    config = "";
    optional = false;
    plugin = «derivation /nix/store/g2spx98k1plx3hfg3jpqfwwqdh722qqq-vimplugin-conform.nvim-2025-04-20.drv»;
  }
  {
    config = "";
    optional = false;
    plugin = «derivation /nix/store/1f00sg3y4jpals0cvx3zy6dgl8rw20wq-vimplugin-comment.nvim-2024-06-09.drv»;
  }
  {
    config = "";
    optional = false;
    plugin = «derivation /nix/store/raxk1y1knkb05n5sj536x8d7ybw5h0gz-vimplugin-codecompanion.nvim-2025-04-20.drv»;
  }
  {
    config = "";
    optional = false;
    plugin = «derivation /nix/store/b5b7xx4ljy1rbf7n9fj7ik3f1gsviq0x-vimplugin-blink.cmp-1.1.1.drv»;
  }
  «derivation /nix/store/2wrqqr1km1liiiwc6k7zsv2lrc65yw45-vimplugin-nvim-ts-context-commentstring-2024-12-07.drv»
  «derivation /nix/store/xnl3jlcqd3zrzqz9m8dl1f49h3nxsds4-vimplugin-nvim-treesitter-textobjects-2025-04-15.drv»
  «derivation /nix/store/9vd9zys6w6szc7vszyril59xccwy3zby-nvim-config.drv»
]

:p packages.aarch64-darwin.default.config.performance.combinePlugins

nix-repl> :p packages.aarch64-darwin.default.config.performance.combinePlugins
{
  enable = false;
  pathsToLink = [
    "/autoload"
    "/colors"
    "/compiler"
    "/doc"
    "/ftplugin"
    "/indent"
    "/keymap"
    "/lang"
    "/lua"
    "/pack"
    "/parser"
    "/plugin"
    "/queries"
    "/rplugin"
    "/spell"
    "/syntax"
    "/tutor"
    "/after"
    "/ftdetect"
    "/data/plenary/filetypes"
    "/lsp"
  ];
  standalonePlugins = [
    «derivation /nix/store/g1l9s0x3qm1i3sk8cwn7i7q7gs42hr50-vimplugin-nvim-lspconfig-2025-04-19.drv»
    «derivation /nix/store/h82hqw1g8p6q4gkqngaj5s9050w0qzya-vimplugin-nvim-treesitter-2025-04-15.drv»
    «derivation /nix/store/9vd9zys6w6szc7vszyril59xccwy3zby-nvim-config.drv»
  ];
}

[MattSturgeon]

I don't see any obvious issues in your init.lua, and looking in your checkhealth output all servers (other than eslint) have config from nvim-lspconfig.

I've cloned your config locally, it seems the nvim-lspconfig in your nixvim's nixpkgs doesn't have an lsp/eslint.lua which explains the issue:

Details

$ nix repl
Nix 2.28.2
Type :? for help.

nix-repl> :lf .
Added 21 variables.

nix-repl> inputs.nixvim.inputs.nixpkgs.legacyPackages.x86_64-linux.vimPlugins.nvim-lspconfig
«derivation /nix/store/xhgb9if6frgl8gp9ykk147yxd2bwiz2p-vimplugin-nvim-lspconfig-2025-04-19.drv»

nix-repl> "${inputs.nixvim.inputs.nixpkgs.legacyPackages.x86_64-linux.vimPlugins.nvim-lspconfig}"
"/nix/store/hmhhy2wah8l487cbx3d1hhpv2fqg466z-vimplugin-nvim-lspconfig-2025-04-19"


$ ls /nix/store/hmhhy2wah8l487cbx3d1hhpv2fqg466z-vimplugin-nvim-lspconfig-2025-04-19/lsp/eslint.lua
ls: cannot access '/nix/store/hmhhy2wah8l487cbx3d1hhpv2fqg466z-vimplugin-nvim-lspconfig-2025-04-19/lsp/eslint.lua': No such file or directory

Looking upstream at nvim-lspconfig, there is a lsp/eslint.lua file which was introduced 2025-04-21 (neovim/nvim-lspconfig#3731).

However, nixpkgs is still using nvim-lspconfig 32b6a644 from 2025-04-19 (even nixpkgs master is using that rev).

So you're running into neovim/nvim-lspconfig#3705 and either need to use a workaround, update vimPlugins.nvim-lspconfig yourself with an overlay, or wait for nixpkgs to update.

[MattSturgeon]

As a temporary solution, you can bump nvim-lspconfig yoursef using this overlay:

(pkgs: prevPkgs: {
  vimPlugins = prevPkgs.vimPlugins.extend (plugins: prevPlugins: {
    # Update nvim-lspconfig to fix https://github.com/nix-community/nixvim/issues/3224
    # TODO: remove once nixpkgs updates vimPlugins
    nvim-lspconfig = prevPlugins.nvim-lspconfig.overrideAttrs {
      src = pkgs.fetchFromGitHub {
        owner = "neovim";
        repo = "nvim-lspconfig";
        rev = "c48fac0936f24a5a2dbea9c8379ec9414a45eb8b";
        hash = "sha256-L/yz0egBCIJ9kIDoZzX/+9GHx2au2VtlOPkm+zZ+T7M=";
      };
    };
  });
})

PR submitted to your config: IMax153/nixvim#1

[MattSturgeon]

(Reopening until a fix makes it to nixvim's pinned nixpkgs)

[IMax153]

@MattSturgeon - thank you so much for helping me to debug the issue, as well as to understand better how Nixvim / Neovim source configs for the LSPs! Also makes perfect sense why some LSPs were working and some were not!

I appreciate your patience 🙏

[MattSturgeon]

FYI: @IMax153 you can remove the overlay next time you bump your nixvim input. We have reverted our migration from nvim-lspconfig's old API to the new API for now due to issues like this one.