npm install jsweet-core json { "name": "my-project", "target": "ts", "source": "src/main/java", "jsOutputDir": "src/main/js" } public class StringUtils { public static String reverse(String str) { return new StringBuilder(str).reverse().toString(); } } npx jsweetc jsweetconfig.json typescript import { StringUtils } from './src/main/js/StringUtils';