chore: remove useless code

lua/Trans/core/buffer.lua

@@ -2,7 +2,7 @@ local api, fn = vim.api, vim.fn
 
 ---@class TransBuffer
 ---@field bufnr integer buffer handle
----@field [number] string|TransNode|TransNode[] buffer[line] content
+---@field [integer] string|TransNode|TransNode[] buffer[line] content
 local buffer = {}
 
 -- INFO : corountine can't invoke C function

lua/Trans/util/node.lua

@@ -4,9 +4,9 @@ local util = require 'Trans'.util
 ---@field [1] string text to be rendered
 ---@field render fun(self: TransNode, buffer: TransBuffer, line: number, col: number) render the node
 
-
+local item = (function()
     ---@class TransItem : TransNode
-local item_meta = {
+    local mt = {
         ---@param self TransItem
         ---@param buffer TransBuffer
         ---@param line integer
@@ -17,11 +17,22 @@ local item_meta = {
             end
         end,
     }
+    mt.__index = mt
 
+    ---Basic item node
+    ---@param tuple {[1]: string, [2]: string?}
+    ---@return TransItem
+    return function(tuple)
+        return setmetatable(tuple, mt)
+    end
+end)()
+
+local text = (function()
     ---@class TransText : TransNode
     ---@field step string
     ---@field nodes TransNode[]
-local text_meta = {
+
+    local mt = {
         ---@param self TransText
         ---@param buffer TransBuffer
         ---@param line integer
@@ -38,28 +49,18 @@ local text_meta = {
         end,
     }
 
-item_meta.__index = item_meta
-text_meta.__index = text_meta
-
-
----Basic item node
----@param tuple {[1]: string, [2]: string?}
----@return TransItem
-local function item(tuple)
-    return setmetatable(tuple, item_meta)
-end
-
-
+    mt.__index = mt
 
     ---@param nodes {[number]: TransNode, step: string?}
     ---@return TransText
-local function text(nodes)
+    return function(nodes)
         return setmetatable({
             [1]   = table.concat(util.list_fields(nodes, 1), nodes.step),
             step  = nodes.step,
             nodes = nodes,
-    }, text_meta)
+        }, mt)
     end
+end)()
 
 
 ---@param args {[number]: TransNode, width: integer, spin: string?}
@@ -85,7 +86,6 @@ end
 ---@class TransUtil
 ---@field node TransNodes
 
-
 ---@class TransNodes
 return {
     item = item,