/**
 * Format an ERD like structure with graphviz.
 * For html formatting or other documentation see
 * https://graphviz.org/doc/info/shapes.html#html
 *
 * @param codeGen
 * @param {CodeGenStructure} structure
 * @returns {string}
 */
export function formatGraphOfSql(codeGen: any, structure: CodeGenStructure): string;