Example of using `withTheme` with Flow

I create a component with `Props` type that includes a theme:

```js
type Props = {
theme: MyTheme,
otherProps: any,
};

class MyCmp extends PureComponent { ... }
```

Then I export it like this:

```js
export withTheme(MyCmp);
```

Then when I import it and use in JSX I'm getting a Flow error that `theme` prop is required.

What is the idiomatic example of defining `withTheme` component with Flow?