Function jars 

pub fn jars(
    root: &Path,
    meta: &YogToml,
    build_dir: &Path,
    content: &[(String, String)],
) -> Result<Vec<(String, Vec<u8>)>, String>

The mod’s scripts’ jars as .yog entries, their content declarations bound to content (each file’s (kind, id)); none when it has no .ys.