Function ast_grep_napi::js::find_in_files

pub fn find_in_files(
    config: FindConfig,
    callback: JsFunction
) -> Result<AsyncTask<IterateFiles<(ThreadsafeFunction<PinnedNodes, CalleeHandled>, RuleCore<SupportLang>)>>>

Discover and parse multiple files in Rust. config specifies the file path and matcher. callback will receive matching nodes found in a file.