code: func (fsc *FetchSourceContext) Source() (interface{}, error) {
  	if !fsc.fetchSource {
  		return false, nil
  	}
  	if len(fsc.includes) == 0 && len(fsc.excludes) == 0 {
  		return true, nil
  	}
  	src := make(map[string]interface{})
  	if len(fsc.includes) > 0 {
  		src["includes"] = fsc.includes
  	}
  	if len(fsc.excludes) > 0 {
  		src["excludes"] = fsc.excludes
  	}
  	return src, nil
  }
docs: // Source returns the JSON-serializable data to be used in a body.