code: func (c *Option) prepare() (opts *js.Object) {
  	if len(c.coms) > 0 {
  		c.Set("components", c.coms)
  	}
  	if len(c.props) > 0 {
  		c.Set("props", c.props)
  	}
  	if len(c.mixins) > 0 {
  		c.Set("mixins", c.mixins)
  	}
  	return c.Object
  }
docs: // prepare set the proper options into js.Object