How to use the mysql2/promise.js.createPool function in mysql2

async function setupConnectionPool() {
    const dbConfig = MysqlDb.connectionParams();
    dbConfig.namedPlaceholders = true;
    connectionPool = mysql.createPool(dbConfig);
    debug('MysqlDb.setupConnectionPool', `connect to ${dbConfig.host}/${dbConfig.database}`);

    // traditional mode ensures not null is respected for unsupplied fields, ensures valid JavaScript dates, etc
    await connectionPool.query('SET SESSION sql_mode = "TRADITIONAL"');
}