What is “yarn” Package?

JavaScript package manager
For more details: https://yarnpkg.com/

Installation

• Open Terminal by pressing command+space then type terminal and hit Enter key.
• Install homebrew first.

  ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null

• Install yarn.

  brew install yarn

Now, use yarn!