Yarn caches every package it downloads so it never needs to again. It also parallelizes operations to maximize resource utilization so install times are faster than ever.
Yarn uses checksums to verify the integrity of every installed package before its code is executed.
Using a detailed, but concise, lockfile format, and a deterministic algorithm for installs, Yarn is able to guarantee that an install that worked on one system will work exactly the same way on any other system.
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If you've installed a package before, you can install it again without any internet connection.
The same dependencies will be installed the same exact way across every machine regardless of install order.
Yarn efficiently queues up requests and avoids request waterfalls in order to maximize network utilization.
Install any package from either npm or Bower and keep your package workflow the same.
A single request failing won't cause an install to fail. Requests are retried upon failure.
Resolve mismatching versions of dependencies to a single version to avoid creating duplicates.