How to use the @accordproject/concerto-tools.FileWriter function in @accordproject/concerto-tools

visitor = new TypescriptVisitor();
            break;
        case 'Java':
            visitor = new JavaVisitor();
            break;
        case 'JSONSchema':
            visitor = new JSONSchemaVisitor();
            break;
        case 'XMLSchema':
            visitor = new XmlSchemaVisitor();
            break;
        }

        if(visitor) {
            let parameters = {};
            parameters.fileWriter = new FileWriter(output);
            modelManager.accept(visitor, parameters);
            return `Compiled to ${target} in '${output}'.`;
        }
        else {
            return 'Unrecognized target: ' + target;
        }
    }