Function scripts_from_files 

pub fn scripts_from_files<D: Directive>(
    files: &[(String, Option<&str>)],
    rules: &impl SceneRules<D>,
) -> Result<Scripts<D>, Vec<ContentError>>

Like scripts_from_sources, for files given as (file name, source) where a None source is a file that isn’t valid UTF-8 (an error).