How can I search specify filetype under fzf Ag or Rg

[rmGFW]

How can I search specify filetype under fzf Ag or Rg 🙏

[Grueslayer]

FIrst of all I recommand using https://github.com/jesseleite/vim-agriculture as FZF extension. It replaces :Rgand :Ag with quite better defaults and uses Rg/Ag for searching instead filtering the result. Furthermore :AgRaw / :RgRaw gives you the ability to pass paramaters to the command.

:RgRaw -g "**/*.txt" ""