JavaScript API define need able to return hash Object when second parameter is a function.

[hooozen]

To reproduce:

var stylus = require('stylus');

str = `
.foo 
  for p, v in obj
    {p}: v

.bar
  for p, v in getObj(#aaa)
    {p}: v
`
stylus(str)
  .set('filename', 'nesting.css')
  .define('obj', { display: 'block', color: 'white' }, true)
  .define("getObj", function (color) {
    return { display: 'block', color: color }
  }, true)
  .render(function (err, css) {
    if (err) throw err;
    console.log(css);
  }, true)

Current behavior:

.foo {
  display: 'block';
  color: 'white';
}
.bar {
  display: 0;
  color: 1;
}

Expected behavior:

.foo {
  display: 'block';
  color: 'white';
}
.bar {
  display: block;
  color: #aaa;
}

When I pass a JavaScript object variable to define() and want to get a hash object variable, I can do this by setting raw to true, as mentioned in #2780 and #1286. But when I pass a function that returns a JavaScript object to define(), the raw will not work as the former. see utils.js#L304.

Environment information:

• stylus version: 0.59.0
• nodejs version: 18.5.0