Fix lua_ls diagnostic warnings

init.lua

@@ -14,15 +14,21 @@ vim.loader.enable()
 local version = vim.version
 
 -- check if we have the latest stable version of nvim
-local expected_ver = "0.10.1"
-local expect_ver = version.parse(expected_ver)
-local actual_ver = version()
+local expected_ver_str = "0.10.1"
+local expect_ver = version.parse(expected_ver_str)
+local actual_ver = vim.version()
+
+if expect_ver == nil then
+  local msg = string.format("Unsupported version string: %s", expected_ver_str)
+  vim.api.nvim_err_writeln(msg)
+  return
+end
 
 local result = version.cmp(expect_ver, actual_ver)
 
 if  result ~= 0 then
   local _ver = string.format("%s.%s.%s", actual_ver.major, actual_ver.minor, actual_ver.patch)
-  local msg = string.format("Expect nvim %s, but got %s instead. Use at your own risk!", expected_ver, _ver)
+  local msg = string.format("Expect nvim %s, but got %s instead. Use at your own risk!", expected_ver_str, _ver)
   vim.api.nvim_err_writeln(msg)
 end
 

lua/config/nvim_ufo.lua

@@ -1,6 +1,5 @@
 local handler = function(virtText, lnum, endLnum, width, truncate)
   local newVirtText = {}
-  local totalLines = vim.api.nvim_buf_line_count(0)
   local foldedLines = endLnum - lnum
   local suffix = (" 󰁂  %d"):format(foldedLines)
   local sufWidth = vim.fn.strdisplaywidth(suffix)

lua/config/statusline.lua

@@ -127,6 +127,7 @@ local get_active_lsp = function()
   end
 
   for _, client in ipairs(clients) do
+    ---@diagnostic disable-next-line: undefined-field
     local filetypes = client.config.filetypes
     if filetypes and vim.fn.index(filetypes, buf_ft) ~= -1 then
       return client.name
@@ -149,7 +150,7 @@ require("lualine").setup {
     lualine_b = {
       {
         "branch",
-        fmt = function(name, context)
+        fmt = function(name, _)
           -- truncate branch name in case the name is too long
           return string.sub(name, 1, 20)
         end,

lua/mappings.lua

@@ -1,5 +1,4 @@
 local keymap = vim.keymap
-local api = vim.api
 local uv = vim.uv
 
 -- Save key strokes (now we do not need to press shift to enter command mode).
@@ -215,6 +214,9 @@ keymap.set("n", "<leader>cb", function()
   local cnt = 0
   local blink_times = 7
   local timer = uv.new_timer()
+  if timer == nil then
+    return
+  end
 
   timer:start(0, 100, vim.schedule_wrap(function()
     vim.cmd [[