Function scan_version 

pub fn scan_version(
    scanner: &CandidateScanner,
    store: &mut dyn CandidateBytes,
    version: &CandidateVersion,
    rules_paths: &[Vec<u8>],
) -> Result<Vec<CandidateScan>, ScanRunError>

What: Scan each eligible candidate and return the scanner’s result for every one scanned. &mut dyn CandidateBytes lends any byte reader for changing (it may read objects); &[Vec<u8>] is “the rules files’ candidate pathnames, none when no file is tracked”; Result<T, E> is “a value or a failure”. Why: Results are returned for clean candidates too, so the caller can tell “scanned and clean” from “not scanned”. The first failure ends the pass with no partial result, because a partial result would look like a clean pass.

In TS you’d write (pseudocode):

async function scanVersion(scanner, store, version, rulesPath?): Promise<CandidateScan[]>;