How do I use this with TypeScript?

I can figure out the:

```
{
  "compilerOptions": {
    "jsx": "react",
    "jsxFactory": "h",
  },
}
```

But I can't figure out how to get the typings going for `h` and things like `children`,

Specifically the error I'm getting on any JSX element is:

> JSX element implicitly has type 'any' because no interface 'JSX.IntrinsicElements' exists.ts(7026)
