[no subject]

  const exports = {
    quantity: 1,
    type: 'boxes',
  };
  exports.getQuantity = () => {
    foo();
  };

This diff driver would mistakenly detect `exports.getQuantity = () =>
{`.

Although, the more I think about it, the spirit of this patch seems to
be "we want to show headers whenever we think we are in a function", so
we don't actually need to treat 'exports' or 'module.exports' specially
at all, e.g. this case should also pass our diff driver tests:

  const foo = {};
  foo.RIGHT = () => {

    ChangeMe();
  };

and if we do this, we will correctly handle 'exports' and
'module.exports' anyway by virtue of them being plain old JS objects.