In this chapter, we had a look at features of TypeScript that help us to build future-proof TypeScript code. We looked at how to set the appropriate ES levels to simulate or use modern ECMAScript features. We looked at how to use union and intersection types as well as how to create type aliases. We then looked into object spread and REST properties before we covered AOP with decorators. We also covered how to create and use map types, as well as using generics and promises.
As preparation for the UIs we will be producing in the rest of this book, we briefly looked at using Bootstrap to lay out UIs and covered the basics of the Bootstrap grid layout system.
In the next chapter, we are going to build a simple markdown editor using a simple Bootstrap web page hooked up to our TypeScript. We will see how techniques such as design patterns and single responsibility classes help us to create robust professional code.