Minify.php

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

use Magento\Framework\Code\Minifier\AdapterInterface;
use Magento\Framework\View\Asset\Minification;
use Magento\Framework\View\Asset\PreProcessor;
use Magento\Framework\View\Asset\PreProcessorInterface;

class Minify implements PreProcessorInterface
{
    protected $adapter;

    protected $minification;

    public function __construct(AdapterInterface $adapter, Minification $minification)
    {
        $this->adapter = $adapter;
        $this->minification = $minification;
    }

    public function process(PreProcessor\Chain $chain)
    {
        if ($this->minification->isEnabled(pathinfo($chain->getTargetAssetPath(), PATHINFO_EXTENSION)) &&
            $this->minification->isMinifiedFilename($chain->getTargetAssetPath()) &&
            !$this->minification->isMinifiedFilename($chain->getOrigAssetPath())
        ) {
            $content = $this->adapter->minify($chain->getContent());
            $chain->setContent($content);
        }
    }
}