Yarn is a JavaScript Package Manager, a direct competitor of npm, one of the Facebook Open Source projects. Published Feb 24 2018 , Last Updated Jan 23 2019. Join the 2022 Full-Stack Web Dev Bootcamp!

What does -- Dev do in yarn?

yarn add <package…> Using –dev or -D will install one or more packages in your devDependencies .

What is yarn in JS?

Yarn is a new JavaScript package manager that aims to be speedy, deterministic, and secure. See how easy it is to drop yarn in where you were using npm before, and get faster, more reliable installs. [00:01] Yarn is a package manager for JavaScript.