Add formatting.deprecated option

README.md

@@ -195,6 +195,13 @@ vim's `completeopt` setting. Warning: Be careful when changing this value.
 Default: `menu,menuone,noselect`
 
 
+### formatting.deprecated (type: boolean)
+
+Specify deprecated candidate should be marked as deprecated or not.
+
+Default: `true`
+
+
 ### formatting.format (type: fun(entry: cmp.Entry, vim_item: vim.CompletedItem): vim.CompletedItem)
 
 A function to customize completion menu.

lua/cmp/config/default.lua

@@ -51,6 +51,7 @@ return function()
     mapping = {},
 
     formatting = {
+      deprecated = true,
       format = function(_, vim_item)
         return vim_item
       end

lua/cmp/entry.lua

@@ -204,9 +204,11 @@ entry.get_vim_item = function(self, suggest_offset)
     end
 
     -- deprecated
+    if config.get().formatting.deprecated then
       if completion_item.deprecated or vim.tbl_contains(completion_item.tags or {}, types.lsp.CompletionItemTag.Deprecated) then
         abbr = str.strikethrough(abbr)
       end
+    end
 
     -- append delta text
     if suggest_offset < self:get_offset() then

lua/cmp/types/cmp.lua

@@ -75,6 +75,7 @@ cmp.ScrollDirection.Down = 'down'
 ---@field public comparators function[]
 
 ---@class cmp.FormattingConfig
+---@field public deprecated boolean
 ---@field public format fun(entry: cmp.Entry, vim_item: vim.CompletedItem): vim.CompletedItem
 
 ---@class cmp.SnippetConfig