refactor(config): prefer vim.list.unique for normalization

Also fix some emmyluals warnings

lua/nvim-treesitter/config.lua

@@ -69,7 +69,7 @@ function M.get_available(tier)
     languages = vim.tbl_filter(
       --- @param p string
       function(p)
-        return parsers[p].tier == tier
+        return parsers[p] ~= nil and parsers[p].tier == tier
       end,
       languages
     )
@@ -164,8 +164,13 @@ function M.norm_languages(languages, skip)
     end
   end
 
-  table.sort(languages)
-  return vim.fn.uniq(languages) --[=[@as string[]]=]
+  -- TODO(clason): remove Nvim 0.11 compat
+  if vim.list then
+    return vim.list.unique(languages)
+  else
+    table.sort(languages)
+    return vim.fn.uniq(languages) --[=[@as string[] ]=]
+  end
 end
 
 return M

lua/nvim-treesitter/indent.lua

@@ -52,7 +52,8 @@ local function find_delimiter(bufnr, node, delimiter)
       local end_char = { child:end_() }
       local trimmed_after_delim
       local escaped_delimiter = delimiter:gsub('[%-%.%+%[%]%(%)%$%^%%%?%*]', '%%%1')
-      trimmed_after_delim = line:sub(end_char[2] + 1):gsub('[%s' .. escaped_delimiter .. ']*', '')
+      trimmed_after_delim =
+        assert(line):sub(end_char[2] + 1):gsub('[%s' .. escaped_delimiter .. ']*', '')
       return child, #trimmed_after_delim == 0
     end
   end

lua/nvim-treesitter/install.lua

@@ -40,6 +40,7 @@ end
 
 ---@async
 ---@param path string
+---@return string? err
 local function rmpath(path)
   local stat = uv.fs_lstat(path)
   if not stat then
@@ -482,6 +483,7 @@ end
 ---@async
 ---@param languages string[]
 ---@param options? InstallOptions
+---@return boolean true if installation successful
 local function install(languages, options)
   options = options or {}