Simplest possible TypeScript project setup

Questions
,
2

Changing tsconfig.json to:

{
    "compilerOptions": {
        "module": "system",
        "target": "es2015",
        "moduleResolution": "node",
    }
}

as per saurabhstc’s post seems to fix the “ReferenceError: Can’t find variable: exports” problem, but I now get:

ReferenceError: Can't find variable: System

in the JavaScript console, so I guess I’m not including some required script or other in advance of my own? I tried putting

<script src="https://cdn.babylonjs.com/babylon.js"></script>

in the HTML header, but no luck so far.