nvim: adding commentstring for kdl filetype

nvim/lua/config/filetypes.lua

@@ -28,6 +28,13 @@ autocmd('Filetype', {
     end
 })
 
+autocmd('Filetype', {
+    pattern = 'kdl',
+    callback = function()
+        vim.cmd('setlocal commentstring=//\\%s')
+    end
+})
+
 
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