We'll use the following technologies in this chapter:

• TypeScript playground: This is a website at http://www.typescriptlang.org/play that allows us to play and understand the features in TypeScript without installing it. We'll use this the majority of the time in this chapter.
• Visual Studio Code: We'll need an editor to write our React and TypeScript code that can be installed from the https://code.visualstudio.com/ website. We will also need the TSLint (by egamma) and Prettier (by Esben Petersen) extensions installed within Visual Studio Code.