Function getDirectoryLastUpdated

eng/generate-website-data.mjs:126–141

* Find the latest git-modified date for any file under a directory.

(gitDates, relativeDirPath)

 * Find the latest git-modified date for any file under a directory.
 */
function getDirectoryLastUpdated(gitDates, relativeDirPath) {
  const prefix = `${relativeDirPath}/`;
  let latestDate = null;
  let latestTime = 0;

  for (const [filePath, date] of gitDates.entries()) {
    if (!filePath.startsWith(prefix)) continue;
    const timestamp = Date.parse(date);
    if (!Number.isNaN(timestamp) && timestamp > latestTime) {
      latestTime = timestamp;
      latestDate = date;
    }
  }

  return latestDate;
}

/**
 * Get the current commit SHA for the checked-out repository.