return "", err
	}
	out2, err := util.OverlayYAML(istioOperatorTreeString, out)
	if err != nil {
		return "", err
	}
	return out2, nil
}

// Convert the generated YAML to pretty JSON.
func yamlToPrettyJSON(yml string) (string, error) {
	// YAML objects are not completely compatible with JSON
	// objects. Let yaml.YAMLToJSON handle the edge cases and
	// we'll re-encode the result to pretty JSON.