TypeScript is a typed superset of JavaScript created by Microsoft that adds optional types, classes, async/await, and many other features, and compiles to plain JavaScript.

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TypeScript is an incredibly useful tool, especially when developing heavy client apps with large teams. It's a strong asset for AngularJS apps.

TypeScript is a compile-to-JavaScript language that brings compile-time type checks, classical object-oriented programming patterns, and powerful typing features to JavaScript.

TypeScript takes 95% of the usefulness of a good statically-typed language and brings it to the JavaScript ecosystem. You still feel like you write ES6: you keep using the same standard library, same third-party libraries, same idioms, and many of the same tools (e.g., Chrome dev tools). It gives you a lot without forcing you out of the JavaScript ecosystem.

AngularJS turned the front-end development world upside down when it was released, bringing together a number of new or recent web application development practices into a powerful and easy-to-use framework. With version 2, the Angular team has started from scratch with a completely new system. Many of the ideas behind Angular are still the same, but the API and developer experience are very different.

In the 2017 StackOverflow Developer Survey, TypeScript was the third most-loved programming technology. Given how quickly static type checking is gaining traction, we wanted to share our experiences and practices.