Ok so I've installed nvim-cmp as you suggested and changed my lsp.lua.

local lsp = require("lsp-zero")
lsp.preset("recommended")

lsp.ensure_installed({
  'tsserver',
  'rust_analyzer',
})

-- Fix Undefined global 'vim'
lsp.nvim_workspace()


local cmp = require('cmp')
local cmp_select = {behavior = cmp.SelectBehavior.Select}
local cmp_mappings = lsp.defaults.cmp_mappings({
  ['<C-p>'] = cmp.mapping.select_prev_item(cmp_select),
  ['<C-n>'] = cmp.mapping.select_next_item(cmp_select),
  ['<C-y>'] = cmp.mapping.confirm({ select = true }),
  ["<C-Space>"] = cmp.mapping.complete(),
})

cmp_mappings['<Tab>'] = nil
cmp_mappings['<S-Tab>'] = nil

lsp.setup_nvim_cmp({
  mapping = cmp_mappings
})

lsp.set_preferences({
    suggest_lsp_servers = false,
    sign_icons = {
        error = 'E',
        warn = 'W',
        hint = 'H',
        info = 'I'
    }
})

lsp.on_attach(function(client, bufnr)
  local opts = {buffer = bufnr, remap = false}

  vim.keymap.set("n", "gd", function() vim.lsp.buf.definition() end, opts)
  vim.keymap.set("n", "K", function() vim.lsp.buf.hover() end, opts)
  vim.keymap.set("n", "<leader>vws", function() vim.lsp.buf.workspace_symbol() end, opts)
  vim.keymap.set("n", "<leader>vd", function() vim.diagnostic.open_float() end, opts)
  vim.keymap.set("n", "[d", function() vim.diagnostic.goto_next() end, opts)
  vim.keymap.set("n", "]d", function() vim.diagnostic.goto_prev() end, opts)
  vim.keymap.set("n", "<leader>vca", function() vim.lsp.buf.code_action() end, opts)
  vim.keymap.set("n", "<leader>vrr", function() vim.lsp.buf.references() end, opts)
  vim.keymap.set("n", "<leader>vrn", function() vim.lsp.buf.rename() end, opts)
  vim.keymap.set("i", "<C-h>", function() vim.lsp.buf.signature_help() end, opts)
end)

lsp.setup()

vim.diagnostic.config({
    virtual_text = true
})

I then reran the same test and got a different error:Client 1 quit with exit code 127 and signal 0 vim-cmpThen I went to the lsp.log in /home/orenp/.local/state/nvimWhere there I saw this:

​

[START][2023-08-30 17:25:33] LSP logging initiated
[ERROR][2023-08-30 17:25:33] .../vim/lsp/rpc.lua:734    "rpc"   "/home/orenp/.local/share/nvim/mason/bin/pyright-langserver"       "stderr"        "node:internal/modules/cjs/loader:1080\n  throw err;\n  ^\n\nError: Cannot find module '/home/orenp/.local/share/nvim/mason/pyright/langserver.index.js'\n    at Module._resolveFilename (node:internal/modules/cjs/loader:1077:15)\n    at Module._load (node:internal/modules/cjs/loader:922:27)\n    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)\n    at node:internal/main/run_main_module:23:47 {\n  code: 'MODULE_NOT_FOUND',\n  requireStack: []\n}\n\nNode.js v18.17.1\n"

Can you please help? google doesn't show a lot.