Function getLocaleFromFilepath

scripts/dbUtils.ts:90–100

(filepath: string)

 * @returns The locale string or null if no locale directory is present.
 */
export function getLocaleFromFilepath(filepath: string): string | null {
  const parts = filepath.split('/');
  const yearIdx = parts.findIndex((p) => YEAR_DIR_PATTERN.test(p));
  if (yearIdx < 0) return null;
  const localeCandidate = parts[yearIdx + 1];
  if (!localeCandidate || !LOCALE_PATTERN.test(localeCandidate)) return null;
  // Exclude structural dirs that match BCP 47 syntax but are not locales.
  // 'en' is intentionally not in TRANSLATION_SKIP_DIRS — callers check locale === 'en'.
  if (TRANSLATION_SKIP_DIRS.has(localeCandidate)) return null;
  return localeCandidate;
}

/**
 * Extracts the base index name from a JSON filename.