Function getFileInfo

src/javascript/module.ts:195–216

(root: string, path: string)

 * root, or undefined if the file does not exist.
 */
export function getFileInfo(root: string, path: string): FileInfo | undefined {
  const key = join(root, path);
  let mtimeMs: number;
  let size: number;
  try {
    const stat = statSync(key);
    if (!stat.isFile()) return; // ignore non-files
    accessSync(key, constants.R_OK); // verify that file is readable
    mtimeMs = Math.floor((currentDate ?? stat.mtimeMs) as number);
    size = stat.size;
  } catch {
    fileInfoCache.delete(key); // delete stale entry
    return; // ignore missing, non-readable file
  }
  let entry = fileInfoCache.get(key);
  if (!entry || entry.mtimeMs < mtimeMs) {
    const contents = readFileSync(key);
    const hash = createHash("sha256").update(contents).digest("hex");
    fileInfoCache.set(key, (entry = {mtimeMs, size, hash}));
  }
  return entry;
}

// For testing only!
export function clearFileInfo(root: string, path: string): boolean {