JavaScript's role in web development has gone from being considered a starter language for hobbyist programmers to being regarded as a serious tool for building modern web applications on both the client and the server. This change means that the size and scope of JavaScript applications has grown tremendously, and with that growth, the costs of managing the complexity have also increased. To address this, Microsoft has developed the open source project TypeScript, which is a superset of JavaScript that adds static type checking.
Tip
TypeScript is not limited to Windows, and is a fully open source project that is capable of running on any JavaScript engine that supports ECMAScript 3 or greater.
VS2015 includes integrated support for TypeScript projects, making it easy to get started with the language. Let's take a look at how TypeScript can benefit your web application.