We will use the following technologies in this chapter:

• TypeScript playground: This is a website at https://www.typescriptlang.org/play/ that allows you to play around with and understand the features in TypeScript without installing it.
• Node.js and npm: TypeScript and React are dependent on these. You can install them at: https://nodejs.org/en/download/. If you already have these installed, make sure Node.js is at least Version 8.2 and npm is at least Version 5.2.
• TypeScript: This can be installed via npm, entering the following command in a terminal:

npm install -g typescript

• Visual Studio Code: We'll need an editor to write our TypeScript code. This one can be installed from https://code.visualstudio.com/. Other editors that could be used can be found at https://github.com/Microsoft/TypeScript/wiki/TypeScript-Editor-Support.