postcss-cli: override the output file extensions

Question

I want it to process .dev.css files and output the result in the same folder but only with the .css extension.

Expected result:

src
  login.dev.css <-- input file
  login.css <-- output file

I'm using postcss-cli like this:

postcss src/**/*.dev.css --base src --dir src --ext css --watch --config postcss.config.js

Current result:

It does not remove the .dev extension, so it overrides the same file and result in an infinite loop.