pub trait AsyncFolderSource: Debug {
// Required method
fn get_file_content_async<'life0, 'life1, 'async_trait>(
&'life0 self,
file_name: &'life1 Path,
) -> Pin<Box<dyn Future<Output = Result<(Vec<u8>, Option<String>), FetchError>> + Send + 'async_trait>>
where Self: 'async_trait,
'life0: 'async_trait,
'life1: 'async_trait;
}