return {

  {
    "ray-x/go.nvim",
    dependencies = { -- optional packages
      "ray-x/guihua.lua",
      "neovim/nvim-lspconfig",
      "nvim-treesitter/nvim-treesitter",
    },
    config = function()
      require("go").setup()
    end,
    event = { "CmdlineEnter" },
    ft = { "go", "gomod" },
    build = ':lua require("go.install").update_all_sync()', -- if you need to install/update all binaries
  },
  {
    "nvimtools/none-ls.nvim",
    config = function()
      local null_ls = require("null-ls")
      null_ls.setup({
        sources = {
          null_ls.builtins.formatting.stylua,
          null_ls.builtins.formatting.prettier,
          null_ls.builtins.diagnostics.erb_lint,
          null_ls.builtins.diagnostics.eslint_d,
          null_ls.builtins.diagnostics.rubocop,
          null_ls.builtins.formatting.rubocop,
          null_ls.builtins.formatting.gofumpt,
          null_ls.builtins.formatting.goimports,
          -- null_ls.builtins.formatting.golines,
        },
      })

      vim.keymap.set("n", "<leader>gf", vim.lsp.buf.format, {})
    end,
  },
  {
    "neovim/nvim-lspconfig",
    event = { "BufReadPre", "BufNewFile" },
    dependencies = {
      "hrsh7th/cmp-nvim-lsp",
      { "antosha417/nvim-lsp-file-operations", config = true },
      { "folke/neodev.nvim", opts = {} },
    },
    config = function()
      -- import lspconfig plugin
      local lspconfig = require("lspconfig")

      -- import mason_lspconfig plugin
      local mason_lspconfig = require("mason-lspconfig")

      -- import cmp-nvim-lsp plugin
      local cmp_nvim_lsp = require("cmp_nvim_lsp")

      local keymap = vim.keymap -- for conciseness

      vim.api.nvim_create_autocmd("LspAttach", {
        group = vim.api.nvim_create_augroup("UserLspConfig", {}),
        callback = function(ev)
          -- Buffer local mappings.
          -- See `:help vim.lsp.*` for documentation on any of the below functions
          local opts = { buffer = ev.buf, silent = true }

          -- set keybinds
          opts.desc = "Show LSP references"
          keymap.set("n", "gr", "<cmd>Telescope lsp_references<CR>", opts) -- show definition, references

          opts.desc = "Go to declaration"
          keymap.set("n", "gD", vim.lsp.buf.declaration, opts) -- go to declaration

          opts.desc = "Show LSP definitions"
          keymap.set("n", "gd", "<cmd>Telescope lsp_definitions<CR>", opts) -- show lsp definitions

          opts.desc = "Show LSP implementations"
          keymap.set("n", "gi", "<cmd>Telescope lsp_implementations<CR>", opts) -- show lsp implementations

          opts.desc = "Show LSP type definitions"
          keymap.set("n", "gt", "<cmd>Telescope lsp_type_definitions<CR>", opts) -- show lsp type definitions

          opts.desc = "See available code actions"
          keymap.set({ "n", "v" }, "<leader>ca", vim.lsp.buf.code_action, opts) -- see available code actions, in visual mode will apply to selection

          opts.desc = "Smart rename"
          keymap.set("n", "<leader>rn", vim.lsp.buf.rename, opts) -- smart rename

          opts.desc = "Show buffer diagnostics"
          keymap.set("n", "<leader>D", "<cmd>Telescope diagnostics bufnr=0<CR>", opts) -- show  diagnostics for file

          opts.desc = "Show line diagnostics"
          keymap.set("n", "<leader>d", vim.diagnostic.open_float, opts) -- show diagnostics for line

          opts.desc = "Go to previous diagnostic"
          keymap.set("n", "[d", vim.diagnostic.goto_prev, opts) -- jump to previous diagnostic in buffer

          opts.desc = "Go to next diagnostic"
          keymap.set("n", "]d", vim.diagnostic.goto_next, opts) -- jump to next diagnostic in buffer

          opts.desc = "Show documentation for what is under cursor"
          keymap.set("n", "K", vim.lsp.buf.hover, opts) -- show documentation for what is under cursor

          opts.desc = "Restart LSP"
          keymap.set("n", "<leader>rs", ":LspRestart<CR>", opts) -- mapping to restart lsp if necessary
        end,
      })

      -- used to enable autocompletion (assign to every lsp server config)
      local capabilities = cmp_nvim_lsp.default_capabilities()

      -- Change the Diagnostic symbols in the sign column (gutter)
      -- (not in youtube nvim video)
      local signs = { Error = " ", Warn = " ", Hint = "󰠠 ", Info = " " }
      for type, icon in pairs(signs) do
        local hl = "DiagnosticSign" .. type
        vim.fn.sign_define(hl, { text = icon, texthl = hl, numhl = "" })
      end

      mason_lspconfig.setup_handlers({
        -- default handler for installed servers
        function(server_name)
          lspconfig[server_name].setup({
            capabilities = capabilities,
          })
        end,
        ["svelte"] = function()
          -- configure svelte server
          lspconfig["svelte"].setup({
            capabilities = capabilities,
            on_attach = function(client, bufnr)
              vim.api.nvim_create_autocmd("BufWritePost", {
                pattern = { "*.js", "*.ts" },
                callback = function(ctx)
                  -- Here use ctx.match instead of ctx.file
                  client.notify("$/onDidChangeTsOrJsFile", { uri = ctx.match })
                end,
              })
            end,
          })
        end,
        ["graphql"] = function()
          -- configure graphql language server
          lspconfig["graphql"].setup({
            capabilities = capabilities,
            filetypes = { "graphql", "gql", "svelte", "typescriptreact", "javascriptreact" },
          })
        end,
        ["emmet_ls"] = function()
          -- configure emmet language server
          lspconfig["emmet_ls"].setup({
            capabilities = capabilities,
            filetypes = { "html", "typescriptreact", "javascriptreact", "css", "sass", "scss", "less", "svelte" },
          })
        end,
        ["lua_ls"] = function()
          -- configure lua server (with special settings)
          lspconfig["lua_ls"].setup({
            capabilities = capabilities,
            settings = {
              Lua = {
                -- make the language server recognize "vim" global
                diagnostics = {
                  globals = { "vim" },
                },
                completion = {
                  callSnippet = "Replace",
                },
              },
            },
          })
        end,
      })
    end,
  },
}
