Better developer experience and productivity

Let's fix the bug in the previous section by renaming price to unitPrice. Notice how Visual Studio Code gives us IntelliSense lists unitPrice as an option because it looking at our type definition:

Here, TypeScript and Visual Studio Code are using the types to provide a better authoring experience for us. As well as IntelliSense, we are provided with code navigation features, and the safe renaming of functions and variables across multiple files. These features increase our productivity, particularly when the code base is large and there is a team of people working on it.