SplitJoin incorrectly joins one-line functions that return objects

[LandonSchropp]

Hello again!

SplitJoin seems to have no issues with joining JavaScript one-line functions under normal circumstances. For example, the following function is joined without any issues:

const example = () => {
  return "hello";
};

const example = () => "hello";

However, if the function returns an object, it should be joined with parentheses surrounding it.

This function:

[ 1, 2, 3 ].map(value => {
  return { square: value * value };
});

Joins to this (which isn't valid);

[ 1, 2, 3 ].map(value => { square: value * value });

It should join to this:

[ 1, 2, 3 ].map(value => ({ square: value * value }));

Weirdly, while this example won't produce a correct value, it is valid JavaScript syntax. However, if you add another item to the object, isn't not. This example when joined produces a syntax error:

[ 1, 2, 3 ].map(value => {
  return { value, square: value * value };
});

[ 1, 2, 3 ].map(value => { value, square: value * value });

However, if it's surrounded by parentheses, it's perfectly fine.

[ 1, 2, 3 ].map(value => ({ value, square: value * value }));

I don't know if there's an easy way to solve this without parsing the line, so this issue may not be actionable.

[AndrewRadev]

I'd noticed this issue myself, but hadn't gotten around to fixing it -- I just pushed a fix, could you check it out?

[LandonSchropp]

Sorry to take so long to get back to you. This works great! Thanks so much for tackling this. I can't imagine how complex this extension must get for so many languages. I really appreciate it!