How should capabilities be added?

[magnusriga]

For those using nvim_cmp and cmp-nvim-lsp, it is common to notify the language server (LS) about additional client capabilities added by cmp-nvim-lsp (on top of what Neovim has built-in), so the LS sends all its completion options etc. to the client (I think that is the purpose, though I am not 100% certain).

How can such capabilities be added to typescript-tools?

Here is how it is normally done with other LSPs, inside the config function of nvim-lspconfig, if using lazy.nvim and cmp-nvim-lsp is included as a dependency.

local capabilities = vim.lsp.protocol.make_client_capabilities()
capabilities = vim.tbl_deep_extend('force', capabilities, require('cmp_nvim_lsp').default_capabilities())
local server = servers[server_name] or {}
server.capabilities = vim.tbl_deep_extend('force', {}, capabilities, server.capabilities or {})
require('lspconfig')[server_name].setup(server)

The typescript-tools README says:

The parameters passed into the setup function are also passed to the standard nvim-lspconfig server setup, allowing you to use the same settings here. But you can pass plugin-specific options through the settings parameter, which defaults to:

require("typescript-tools").setup {
  on_attach = function() ... end,
  handlers = { ... },
  -- ....
  settings = {
    -- ....
  }
}

As such I was thinking to do something like this (and making sure cmp_nvim_lsp is installed beforehand):

-- These two lines are added somewhere we have access to 'cmp_nvim_lsp'.
local capabilities = vim.lsp.protocol.make_client_capabilities()
capabilities = vim.tbl_deep_extend('force', capabilities, require('cmp_nvim_lsp').default_capabilities())

require("typescript-tools").setup {
  server = {
    capabilities = capabilities
  },
  -- ....
  settings = {
    -- ....
  }
}

What is the right way to do this? Perhaps I should not nest capabilities inside a server table.

Thank you.

[sventi555]

+1 on this question!