NodeJS MySQL connection and query with Promise

app.js

var mysql = require('mysql');

var connection = mysql.createConnection({
    host: "localhost",
    user: "root",
    password: "",

});

let run_mysql = (mysql_query) => {
    return new Promise(function (resolve, reject) {
        connection.query(mysql_query, function (err, rows, fields) {
            if (err) {
                return reject(err);
            }
            resolve(rows);
        });
    });
}

var createDB = "CREATE DATABASE mydb";

run_mysql(createDB).then(function (rows) {

    console.log(rows);
    console.log("Database Created")

}).catch((err) => setImmediate(() => {
    throw err;
}));