yarn CLI cmd

Source: CLI Introduction | Yarn

yarn add

to add module

yarn create react-app

yarn to init new CRA App

yarn help

to open help menu

yarn init

to create package.json

yarn remove

yarn to remove module

yarn run

to run package.json script

yarn storybook

to run storybook Storybook Concurrent Explorer on default port 6006

yarn test --watchAll

to run Jest Test Runner in Terminal

yarn upgrade

to update Module to their range set by internal package.json

References