What is that npx thing? npx ships with npm and lets you run locally installed tools. We’ll leave off the npx part for brevity throughout the rest of this file! Note: If you forget to install Prettier first, npx will temporarily download the latest version. That’s not a good idea when using Prettier, because we change how code is formatted in each release! It’s important to have a locked down version of Prettier in your package.json. And it’s faster, too.