How to close sql connection when using mysql2/promise?

I have such nodejs code:

var mysql = require('mysql2/promise');

mysql.createConnection({
    host: "localhost",
    user: "root",
    password: "123123",
    database: "mydatabase"
})
.then((connection) => connection.execute("SELECT * FROM mytable"))
.then(([rows, fields]) => {
    console.log(rows);
});

When I execute it, application prints array of database rows and is still running after that. Seems it happens because connection isn't released. How to release it after console.log?

I've tried this way:

var mysql = require('mysql2/promise');

mysql.createConnection({
    host: "localhost",
    user: "root",
    password: "123123",
    database: "mydatabase"
})
.then((connection) => {
    connection.execute("SELECT * FROM mytable")
    .then(([rows, fields]) => {
        console.log(rows);
        connection.release();
    });
});

but result is TypeError: this.connection.release is not a function.

Sorry for my English.

Any ideas?