Man pages matching name plack::middleware::file::sass in section 3pm:

Plack::Middleware::File::Sass.3pm.en	debian 10 / libplack-middleware-file-sass-perl
Plack::Middleware::File::Sass.3pm.en	debian 11 / libplack-middleware-file-sass-perl
Plack::Middleware::File::Sass.3pm.en	debian 12 / libplack-middleware-file-sass-perl