Node.js MySQL transaction with async/await

code.js

// Executes the given function inside
// a transaction.

exports.transaction = async (fn) => {
    assert.equal(typeof fn, 'function');
    // Aquire a connection.
    const connection = await aquire(pool);
    debug('Aquired a connection.');
    try {
        // Begin the transaction.
        await begin(connection);
        debug('Started the transaction.');
        try {
            // Run queries.
            const result = await fn(connection);
            debug('Ran the queries.');
            // Commit the transaction.
            await commit(connection);
            debug('Committed the transaction.');
            // Return query results.
            return result;
        } catch (err) {
            // Rollback the transaction.
            await rollback(connection);
            debug('Rolled back the transaction.');
            throw err;
        }
    } finally {
        // Release the connection.
        connection.release();
        debug('Released the connection.');
    }
};

service.js

exports.save = async (company) => {
    return mysql.transaction(async (connection) => {
        const exists = await companiesRepo.exists(connection, company.name);
        if (exists) {
            const errors = new Errors();
            errors.add('name', 'Company with the same name exists.');
            throw new ValidationError(errors);
        }
        return companiesRepo.save(connection, company);
    });
};