Checksum.php

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<?php
namespace Magento\Framework\View\Asset\MergeStrategy;

use Magento\Framework\App\Filesystem\DirectoryList;
use Magento\Framework\App\ObjectManager;
use Magento\Framework\View\Asset\Source;

class Checksum implements \Magento\Framework\View\Asset\MergeStrategyInterface
{
    protected $strategy;

    protected $filesystem;

    private $assetSource;

    public function __construct(
        \Magento\Framework\View\Asset\MergeStrategyInterface $strategy,
        \Magento\Framework\Filesystem $filesystem
    ) {
        $this->strategy = $strategy;
        $this->filesystem = $filesystem;
    }

    private function getAssetSource()
    {
        if (!$this->assetSource) {
            $this->assetSource = ObjectManager::getInstance()->get(Source::class);
        }
        return $this->assetSource;
    }

    public function merge(array $assetsToMerge, \Magento\Framework\View\Asset\LocalInterface $resultAsset)
    {
        $rootDir = $this->filesystem->getDirectoryRead(DirectoryList::ROOT);
        $mTime = null;
        foreach ($assetsToMerge as $asset) {
            $sourceFile = $this->getAssetSource()->findSource($asset);
            $mTime .= $rootDir->stat($rootDir->getRelativePath($sourceFile))['mtime'];
        }

        if (null === $mTime) {
            return; // nothing to merge
        }

        $dat = $resultAsset->getPath() . '.dat';
        $targetDir = $this->filesystem->getDirectoryWrite(DirectoryList::STATIC_VIEW);
        if (!$targetDir->isExist($dat) || strcmp($mTime, $targetDir->readFile($dat)) !== 0) {
            $this->strategy->merge($assetsToMerge, $resultAsset);
            $targetDir->writeFile($dat, $mTime);
        }
    }
}