Any programmer working with a dynamically typed language will tell you how hard it is to scale to more lines of code and more engineers. That’s why Facebook, Google, and Microsoft invented gradual static type layers for their dynamically typed JavaScript and Python code. This practical book shows you how one such type layer, TypeScript, is unique among them: it makes programming fun with its powerful static type system.If you’re a programmer with intermediate JavaScript experience, author Boris Cherny will teach you how to master the TypeScript language. You’ll understand how TypeScript can help you eliminate bugs in your code and enable you to scale your code across more engineers than you could before.In this book, you’ll:Start with the basics: Learn about TypeScript’s different types and type operators, including what they’re for and how they’re usedExplore advanced topics: Understand TypeScript’s sophisticated type system, including how to safely handle errors and build asynchronous programsDive in hands-on: Use TypeScript with your favorite frontend and backend frameworks, migrate your existing JavaScript project to TypeScript, and run your TypeScript application in production About the Author Boris Cherny is a Software Engineer at Facebook and the organizer of the San Francisco TypeScript Meetup. A longtime JavaScript programmer and functional programming evangelist Boris has started several startups, and led engineering teams in adtech and venture capital. In his free time, you can find him working on open source on Github.