Recast is adding extra newlines in ObjectExpressions

Refer to the following fiddle: http://astexplorer.net/#/27xKOBJJGN

When I have an object with a structure such as this:

const styles = {
  base: {
    height: '100%',
  },
  ribbon: {
    backgroundColor: 'black',
  },
};

and I do anything with the body of the ObjectExpression like this:

export default function(file, api) {
  const j = api.jscodeshift;
  window.j = j;
  const { statement, statements } = j.template;
  return j(file.source)
    .find(j.VariableDeclarator)
    .replaceWith(p => {
        p.node.init = j.objectExpression(p.node.init.properties);
        return p.node;
    })
    .toSource();
};

then the following output is gotten:

const styles = {
  base: {
    height: '100%',
  },

  ribbon: {
    backgroundColor: 'black',
  }
};

see that extra newline after base and before ribbon. These lines are added after every property, which is adding unnecessary changes to my codebase. Is there a way to suppress that? or is that a bug?

Start with the linked AST Explorer fiddle and trace how ObjectExpression properties are printed when toSource() is called after rebuilding the object expression. Compare the transformed output with the original formatting; done means no extra blank lines are inserted between object properties.