Direct.php

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

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

class Direct implements \Magento\Framework\View\Asset\MergeStrategyInterface
{
    const MERGE_DELIMITER_JS = ';';

    const MERGE_DELIMITER_EMPTY = '';

    private $filesystem;

    private $cssUrlResolver;

    public function __construct(
        \Magento\Framework\Filesystem $filesystem,
        \Magento\Framework\View\Url\CssResolver $cssUrlResolver
    ) {
        $this->filesystem = $filesystem;
        $this->cssUrlResolver = $cssUrlResolver;
    }

    public function merge(array $assetsToMerge, Asset\LocalInterface $resultAsset)
    {
        $mergedContent = $this->composeMergedContent($assetsToMerge, $resultAsset);
        $filePath = $resultAsset->getPath();
        $staticDir = $this->filesystem->getDirectoryWrite(DirectoryList::STATIC_VIEW);
        $tmpDir = $this->filesystem->getDirectoryWrite(DirectoryList::TMP);
        $tmpDir->writeFile($filePath, $mergedContent);
        $tmpDir->renameFile($filePath, $filePath, $staticDir);
    }

    private function composeMergedContent(array $assetsToMerge, Asset\LocalInterface $resultAsset)
    {
        $result = [];
        foreach ($assetsToMerge as $asset) {
            $result[] = $this->preProcessBeforeMerging($asset, $resultAsset, $asset->getContent());
        }
        $delimiter = $this->_getFilesContentDelimiter($resultAsset->getContentType());
        $result = $this->preProcessMergeResult($resultAsset, ltrim(implode($delimiter, $result)));
        return $result;
    }

    private function preProcessBeforeMerging(Asset\LocalInterface $item, Asset\LocalInterface $result, $content)
    {
        if ($result->getContentType() == 'css') {
            $from = $item->getPath();
            $to = $result->getPath();
            return $this->cssUrlResolver->relocateRelativeUrls($content, $from, $to);
        }
        return $content;
    }

    private function preProcessMergeResult(Asset\LocalInterface $result, $content)
    {
        if ($result->getContentType() == 'css') {
            $content = $this->cssUrlResolver->aggregateImportDirectives($content);
        }
        return $content;
    }

    protected function _getFilesContentDelimiter($contentType)
    {
        if ($contentType == 'js') {
            return self::MERGE_DELIMITER_JS;
        }
        return self::MERGE_DELIMITER_EMPTY;
    }
}