Fast, reliable and secure npm alternative

 Fast: Yarnpkg caches every package it has downloaded, so it never
 needs to download the same package again. It also does almost
 everything concurrently to maximize resource utilization.
 This means even faster installs.
 .
 Reliable: Using a detailed but concise lockfile format and a
 deterministic algorithm for install operations, Yarnpkg is able
 to guarantee that any installation that works on one system will
 work exactly the same on another system.
 .
 Secure: Yarnpkg uses checksums to verify the integrity of every
 installed package before its code is executed.
 .
 Node.js is an event-based server-side JavaScript engine.