message: fix(es): Pass `FileName::Custom` to plugins
diff: @@ -431,6 +431,7 @@ impl Options {
  let transform_filename = match base {
  FileName::Real(path) => path.as_os_str().to_str().map(String::from),
  + FileName::Custom(filename) => Some(filename.to_owned()),
  _ => None,
  };
  