Verdaccio is an open-source lightweight private proxy registry made in JavaScript with an entirely optional configuration that allows you to publish Node.js private packages and proxy from other remote registries. In this talk, you will learn five ways to take advantage of Verdaccio to improve your workflows and productivity.
You can check the slides for Juan's talk here.

The final stage of a react component is when it is being published and distributed. How can I ensure my packages won’t crash in production? This talk will help you to test your React components publishing them to a private registry and running End-to-End tests against them.