After coming from the iOS world, Jest is one of the most transformative tools for me when working in JavaScript. IT's super powerful, has really really useful f

After coming from the iOS world, Jest is one of the most transformative tools for me when working in JavaScript. IT's super powerful, has really really useful features and is constantly being improved. Some of the GIFs in this post show how awesome the watcher mode in the new Jest release is, I'd strongly recommend giving them a look!