Method hasMutex

packages/jest-runtime/src/internals/TransformCache.ts:112–114

(key: string)

  // concurrent `loadEsmModule` calls on the legacy async path. Goes away
  // once min-Node ≥ v24.9 makes that path obsolete.
  hasMutex(key: string): boolean {
    return this.mutex.has(key);
  }
  awaitMutex(key: string): Promise<void> | undefined {
    return this.mutex.get(key);
  }