How to add a new file tpye in deadgrep?

[sfg]

Hi all,

I defined some new file types (e.g. '.Rnw)' in /home/sven/.config/ripgrep/ripgreprc and run rg in a shell with

export RIPGREP_CONFIG_PATH=/home/sven/.config/ripgrep/ripgreprc
rg STRING --type Rnw

which is fine. But how can I do this with deadgrep in emacs? I have not found a way to make RIPGREP_CONFIG_PATHavailable in deadgrep and emacs, and therefore file-type Rnw is unknown by deadgrep.

Thanks in advance, Sven