In this chapter, we covered each of the different parameters for the TypeScript compiler. We discussed how to target the different versions of ECMAScript as well as which external module pattern to follow. Source maps will become very handy to debug our TypeScript code and declaration files will help us deploy compiled JavaScript while still providing a rich type experience for developers using TypeScript. The ability to pass a file to the compiler allows us to create reusable compilation scripts that can scale much further than using the command line alone. Next, we are going to cover how the different constructs turn what is normally a scripting language into an object-oriented language.