Facebook released their own package manager solution, called Yarn.
Fast, reliable and secure dependency management — this is the promise of Yarn, the new dependency manager.
Installing Yarn

There are several ways of installing Yarn. If you have npm installed, you can just install Yarn with npm: npm install yarn --global

Offline cache

Example:if you install the 4.4.5 version of express with Yarn, it will be put into ~/.yarn-cache/npm-express-4.4.5.

Deterministic Installs

License checks

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