yii2-swiftmailer/framework/console/webapp/default/protected/config/main.php

<?php
return array(
	'id' => 'webapp',
	'name' => 'My Web Application',

	'components' => array(
		// uncomment the following to use a MySQL database
		/*
		'db' => array(
			'class' => 'yii\db\Connection',
			'dsn' => 'mysql:host=localhost;dbname=testdrive',
			'username' => 'root',
			'password' => '',
		),
		*/
		'cache' => array(
			'class' => 'yii\caching\DummyCache',
		),
	),
);