Function memoPatterns

src/resolution/name-matcher.ts:1176–1186

(key: string, build: () => RegExp[])

}

function memoPatterns(key: string, build: () => RegExp[]): RegExp[] {
  const hit = PATTERN_MEMO.get(key);
  if (hit) return hit;
  const patterns = build();
  if (PATTERN_MEMO.size >= PATTERN_MEMO_CAP) {
    const oldest = PATTERN_MEMO.keys().next().value;
    if (oldest !== undefined) PATTERN_MEMO.delete(oldest);
  }
  PATTERN_MEMO.set(key, patterns);
  return patterns;
}

export function localReceiverTypePatterns(language: Language, r: string): RegExp[] {
  return memoPatterns(`${language}|${r}`, () => buildLocalReceiverTypePatterns(language, r));