MergeService.php

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

use Magento\Framework\App\Filesystem\DirectoryList;

class MergeService
{
    protected $objectManager;

    protected $config;

    protected $filesystem;

    protected $state;

    public function __construct(
        \Magento\Framework\ObjectManagerInterface $objectManager,
        ConfigInterface $config,
        \Magento\Framework\Filesystem $filesystem,
        \Magento\Framework\App\State $state
    ) {
        $this->objectManager = $objectManager;
        $this->config = $config;
        $this->filesystem = $filesystem;
        $this->state = $state;
    }

    public function getMergedAssets(array $assets, $contentType)
    {
        $isCss = $contentType == 'css';
        $isJs = $contentType == 'js';
        if (!$isCss && !$isJs) {
            throw new \InvalidArgumentException("Merge for content type '{$contentType}' is not supported.");
        }

        $isCssMergeEnabled = $this->config->isMergeCssFiles();
        $isJsMergeEnabled = $this->config->isMergeJsFiles();
        if (($isCss && $isCssMergeEnabled) || ($isJs && $isJsMergeEnabled)) {
            $mergeStrategyClass = \Magento\Framework\View\Asset\MergeStrategy\FileExists::class;

            if ($this->state->getMode() === \Magento\Framework\App\State::MODE_DEVELOPER) {
                $mergeStrategyClass = \Magento\Framework\View\Asset\MergeStrategy\Checksum::class;
            }

            $mergeStrategy = $this->objectManager->get($mergeStrategyClass);

            $assets = $this->objectManager->create(
                \Magento\Framework\View\Asset\Merged::class,
                ['assets' => $assets, 'mergeStrategy' => $mergeStrategy]
            );
        }

        return $assets;
    }

    public function cleanMergedJsCss()
    {
        $this->filesystem->getDirectoryWrite(DirectoryList::STATIC_VIEW)
            ->delete(Merged::getRelativeDir());
    }
}