Provides built-in, first-class TypeScript support... and it's FREE! :)
Also okay, but not recommended is any other IDE. I hear that Webstorm/IntelliJ is decent though. However, atom and sublime have okay plugins/extension for TypeScript. VSCode is preferred.
The requirements list just includes Node and NPM, but looking through the lessons, it's clear that this is targeted at people using Visual Studio Code. I'd recommend adding it to the list of requirements.