rector/config/set/cakephp30.php

<?php

declare(strict_types=1);

use Rector\CakePHP\Rector\FileWithoutNamespace\ImplicitShortClassNameUseStatementRector;
use Rector\CakePHP\Rector\Namespace_\AppUsesStaticCallToUseStatementRector;
use Rector\Renaming\Rector\Name\RenameClassRector;
use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;

return static function (ContainerConfigurator $containerConfigurator): void {
    $services = $containerConfigurator->services();

    # @see https://github.com/cakephp/upgrade/tree/master/src/Shell/Task
    $services->set(AppUsesStaticCallToUseStatementRector::class);

    $services->set(ImplicitShortClassNameUseStatementRector::class);

    $services->set(RenameClassRector::class)
        ->call('configure', [[
            RenameClassRector::OLD_TO_NEW_CLASSES => [
                # see https://github.com/cakephp/upgrade/blob/756410c8b7d5aff9daec3fa1fe750a3858d422ac/src/Shell/Task/RenameClassesTask.php#L37
                'Cake\Network\Http\HttpSocket' => 'Cake\Network\Http\Client',
                'Cake\Model\ConnectionManager' => 'Cake\Database\ConnectionManager',
                'Cake\TestSuite\CakeTestCase' => 'Cake\TestSuite\TestCase',
                'Cake\TestSuite\Fixture\CakeTestFixture' => 'Cake\TestSuite\Fixture\TestFixture',
                'Cake\Utility\String' => 'Cake\Utility\Text',
                'CakePlugin' => 'Plugin',
                'CakeException' => 'Exception',
                # see https://book.cakephp.org/3/en/appendices/3-0-migration-guide.html#configure
                'Cake\Configure\PhpReader' => 'Cake\Core\Configure\EnginePhpConfig',
                'Cake\Configure\IniReader' => 'Cake\Core\Configure\EngineIniConfig',
                'Cake\Configure\ConfigReaderInterface' => 'Cake\Core\Configure\ConfigEngineInterface',
                # https://book.cakephp.org/3/en/appendices/3-0-migration-guide.html#request
                'CakeRequest' => 'Cake\Network\Request',
            ],
        ]]);
};