Now, here’s where the special nature of React comes in. Besides normal HTML, CSS, and JavaScript, the bulk of your React code will be written in JSX.

That is, that JSX code will generate the div element eventually. If you're using React to process your JSX code then your TypeScript file actually generates a JavaScript file with React-based code ...

React components are created through JavaScript variables that use a createClass method to render HTML that presents data supplied in the form of properties ("props") or state, depending on whether ...