Let’s start by installing Lerna as a dev dependency of your project. Learn more Since my output is a library, I need to rollup all my sources into one JS file that can be used within a browser (or maybe Node.js). npm i -D typescript jest ts-jest @types/jest Configuring Typescript Next, we need to configure Typescript. Ensure that all your new code is fully covered, and see coverage trends emerge. Works with most CI services. Obviously you'll be needing Typescript. Jest. If you want to use JSX, try the react-style-object-to-css library.. Types are only checked inside the
