UninstallCollector.php

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<?php
namespace Magento\Setup\Model;

use Magento\Framework\Module\FullModuleList;
use Magento\Framework\ObjectManagerInterface;
use Magento\Framework\Setup\UninstallInterface;
use Magento\Setup\Module\DataSetupFactory;

class UninstallCollector
{
    private $objectManager;

    private $dataSetupFactory;

    public function __construct(
        ObjectManagerProvider $objectManagerProvider,
        DataSetupFactory $dataSetupFactory
    ) {
        $this->objectManager = $objectManagerProvider->get();
        $this->dataSetupFactory = $dataSetupFactory;
    }

    public function collectUninstall($filterModules = [])
    {
        $uninstallList = [];
        $setup = $this->dataSetupFactory->create();
        $result = $setup->getConnection()->select()->from($setup->getTable('setup_module'), ['module']);
        if (isset($filterModules) && sizeof($filterModules) > 0) {
            $result->where('module in( ? )', $filterModules);
        }
        // go through modules
        foreach ($setup->getConnection()->fetchAll($result) as $row) {
            $uninstallClassName = str_replace('_', '\\', $row['module']) . '\Setup\Uninstall';
            if (class_exists($uninstallClassName)) {
                $uninstallClass = $this->objectManager->create($uninstallClassName);
                if (is_subclass_of($uninstallClass, \Magento\Framework\Setup\UninstallInterface::class)) {
                    $uninstallList[$row['module']] = $uninstallClass;
                }
            }
        }

        return $uninstallList;
    }
}