Force arrow functions to be one-line?

I'm using jscodeshift to convert React string refs to arrow functions.

My input looks like this:
```jsx
();
```

And my output looks like this:
```jsx
( {
this.refTest = ref;
}} />);
```

But, I really want it to look like this:
```jsx
( { this.refTest = ref; }} />);
```

Is there any way to force arrow functions to be one-line?

Reproduce the jscodeshift conversion from the issue and inspect recast's pretty-printing behavior for arrow functions with block bodies. Compare the current multiline JSX output with the requested one-line form, then verify the formatter preserves that wording without changing other output.

Written by the indexing model from the issue text.