return {
  -- lspconfig
  {
    "neovim/nvim-lspconfig",
    opts = {
      -- options for vim.diagnostic.config()
      diagnostics = {
        underline = true,
        update_in_insert = false,
        virtual_text = {
          spacing = 4,
          source = "if_many",
          prefix = "●",
          -- this will set set the prefix to a function that returns the diagnostics icon based on the severity
          -- this only works on a recent 0.10.0 build. Will be set to "●" when not supported
          -- prefix = "icons",
        },
        severity_sort = true,
        float = {
          border = 'rounded',
          source = 'always',
          header = '',
          prefix = '',
        },
      },
      -- Enable this to enable the builtin LSP inlay hints on Neovim >= 0.10.0
      -- Be aware that you also will need to properly configure your LSP server to
      -- provide the inlay hints.
      inlay_hints = {
        enabled = false,
      },
      document_highlight = {
        enabled = true,
      },
    },
    config = function(_, opts)
      local lsp = require('lspconfig')
      local lsp_defaults = lsp.util.default_config

      lsp_defaults.capabilities = vim.tbl_deep_extend(
        'force',
        lsp_defaults.capabilities,
        require('cmp_nvim_lsp').default_capabilities()
      )

      local sign = function(o)
        -- See :help sign_define()
        vim.fn.sign_define(o.name, {
          texthl = o.name,
          text = o.text,
          numhl = ''
        })
      end

      sign({ name = 'DiagnosticSignError', text = '✘' })
      sign({ name = 'DiagnosticSignWarn', text = '▲' })
      sign({ name = 'DiagnosticSignHint', text = '⚑' })
      sign({ name = 'DiagnosticSignInfo', text = '' })

      vim.diagnostic.config({
        virtual_text = false,
        severity_sort = true,
        float = {
          border = 'rounded',
          source = 'always',
          header = '',
          prefix = '',
        },
      })

      vim.lsp.handlers['textDocument/hover'] = vim.lsp.with(
        vim.lsp.handlers.hover,
        { border = 'rounded' }
      )

      vim.lsp.handlers['textDocument/signatureHelp'] = vim.lsp.with(
        vim.lsp.handlers.signature_help,
        { border = 'rounded' }
      )

      vim.lsp.handlers["workspace/diagnostic/refresh"] = function(_, _, ctx)
        local ns = vim.lsp.diagnostic.get_namespace(ctx.client_id)
        pcall(vim.diagnostic.reset, ns)
        return true
      end

      vim.api.nvim_create_autocmd('BufWritePre', {
        pattern = '*.go',
        callback = function()
          vim.lsp.buf.code_action({ context = { only = { 'source.organizeImports' } }, apply = true })
        end
      })

      local on_attach = function(client)
        local bufmap = function(mode, lhs, rhs)
          local opts = { buffer = true }
          vim.keymap.set(mode, lhs, rhs, opts)
        end

        bufmap('n', 'K', '<cmd>lua vim.lsp.buf.hover()<cr>')
        bufmap('n', 'gd', '<cmd>lua vim.lsp.buf.definition()<cr>')
        bufmap('n', 'gD', '<cmd>lua vim.lsp.buf.declaration()<cr>')
        bufmap('n', 'go', '<cmd>lua vim.lsp.buf.type_definition()<cr>')
        bufmap('n', 'gs', '<cmd>lua vim.lsp.buf.signature_help()<cr>')
        bufmap('n', 'gA', '<cmd>Telescope diagnostics<cr>')
        bufmap('n', 'gr', '<cmd>Telescope lsp_references<cr>')
        bufmap('n', 'gi', '<cmd>Telescope lsp_implementations<cr>')
        bufmap('n', '<leader>cr', '<cmd>lua vim.lsp.buf.rename()<cr>')
        bufmap('n', '<leader>ca', '<cmd>lua vim.lsp.buf.code_action()<cr>')
        bufmap('n', 'gl', '<cmd>lua vim.diagnostic.open_float()<cr>')
        bufmap('n', '[d', '<cmd>lua vim.diagnostic.goto_prev()<cr>')
        bufmap('n', ']d', '<cmd>lua vim.diagnostic.goto_next()<cr>')
      end

      lsp.gopls.setup {
        settings = {
          gopls = {
            gofumpt = true,
            codelenses = {
              gc_details = false,
              generate = true,
              regenerate_cgo = true,
              run_govulncheck = true,
              test = true,
              tidy = true,
              upgrade_dependency = true,
              vendor = true,
            },
            hints = {
              assignVariableTypes = true,
              compositeLiteralFields = true,
              compositeLiteralTypes = true,
              constantValues = true,
              functionTypeParameters = true,
              parameterNames = true,
              rangeVariableTypes = true,
            },
            analyses = {
              fieldalignment = true,
              shadow = true,
              unusedvariable = true,
              unusedwrite = true,
              useany = true,
            },
            usePlaceholders = true,
            completeUnimported = true,
            staticcheck = true,
            directoryFilters = { "-.git", "-.vscode", "-.idea", "-.vscode-test", "-node_modules" },
            semanticTokens = true
          },
        },
        on_attach = on_attach
      }
      lsp.clangd.setup {
        settings = {
          clangd = {
            cmd = {
              "clangd",
              "--background-index",
              "--clang-tidy",
              "--header-insertion=iwyu",
              "--completion-style=detailed",
              "--function-arg-placeholders",
              "--fallback-style=llvm",
            },
            init_options = {
              usePlaceholders = true,
              completeUnimported = true,
              clangdFileStatus = true,
            },
          },
        },
        on_attach = on_attach
      }
      lsp.ltex.setup {
        on_attach = on_attach,
        filetypes = { "latex", "tex", "bib", "mkd", "gitcommit", "text" },
      }
      lsp.svelte.setup { on_attach = on_attach }
      lsp.perlls.setup { on_attach = on_attach }
      lsp.ts_ls.setup { on_attach = on_attach }
      lsp.lua_ls.setup {
        settings = {
          Lua = {
            workspace = {
              checkThirdParty = false,
            },
            codeLens = {
              enable = true,
            },
            completion = {
              callSnippet = "Replace",
            },
            diagnostics = {
              globals = { 'vim' }
            },
          }
        },
        on_attach = on_attach
      }
    end
  }
}