After completing this book, you will probably be eager to start a new project to put into practice all your new knowledge. As the new project grows and you develop more complex features, you might encounter some runtime issues.

We should be able to resolve design-time issues with ease because in the previous chapter, we looked at the main TypeScript features.

However, we have not learned much about the TypeScript runtime. The good news is that, depending on your background, you may already know a lot about it, as the TypeScript runtime is the JavaScript runtime. TypeScript is only used at design time; the TypeScript code is then compiled into JavaScript and finally executed. The JavaScript runtime is in charge of the execution. Is important to understand that we never execute TypeScript code and we always execute JavaScript code. For this reason, when we refer to the TypeScript runtime, we will, in fact, be talking about the JavaScript runtime.

When we compile our TypeScript...