github: https://github.com/yarnpkg/yarn

Features

• Offline Mode: If you’ve installed a package before, you can install it again without any internet connection.
• Deterministic: The same dependencies will be installed the same exact way across every machine regardless of install order.
• Network Performance: Yarn efficiently queues up requests and avoids request waterfalls in order to maximize network utilization.
• Multiple Registries: Install any package from either npm or Bower and keep your package workflow the same.
• Network Resilience: A single request failing won’t cause an install to fail. Requests are retried upon failure.
• Flat Mode: Resolve mismatching versions of dependencies to a single version to avoid creating duplicates.
• More emojis. 🐈

感觉可以替代掉 npm 了