Minification.php

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

use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\App\State;

class Minification
{
    const XML_PATH_MINIFICATION_ENABLED = 'dev/%s/minify_files';

    const XML_PATH_MINIFICATION_EXCLUDES = 'dev/%s/minify_exclude';

    private $scopeConfig;

    private $appState;

    private $scope;

    private $configCache = [];

    public function __construct(ScopeConfigInterface $scopeConfig, State $appState, $scope = 'store')
    {
        $this->scopeConfig = $scopeConfig;
        $this->appState = $appState;
        $this->scope = $scope;
    }

    public function isEnabled($contentType)
    {
        if (!isset($this->configCache[self::XML_PATH_MINIFICATION_ENABLED][$contentType])) {
            $this->configCache[self::XML_PATH_MINIFICATION_ENABLED][$contentType] =
                $this->appState->getMode() != State::MODE_DEVELOPER &&
                (bool)$this->scopeConfig->isSetFlag(
                    sprintf(self::XML_PATH_MINIFICATION_ENABLED, $contentType),
                    $this->scope
                );
        }

        return $this->configCache[self::XML_PATH_MINIFICATION_ENABLED][$contentType];
    }

    public function addMinifiedSign($filename)
    {
        $extension = pathinfo($filename, PATHINFO_EXTENSION);

        if ($this->isEnabled($extension) &&
            !$this->isExcluded($filename) &&
            !$this->isMinifiedFilename($filename)
        ) {
            $filename = substr($filename, 0, -strlen($extension)) . 'min.' . $extension;
        }
        return $filename;
    }

    public function removeMinifiedSign($filename)
    {
        $extension = pathinfo($filename, PATHINFO_EXTENSION);

        if ($this->isEnabled($extension) &&
            !$this->isExcluded($filename) &&
            $this->isMinifiedFilename($filename)
        ) {
            $filename = substr($filename, 0, -strlen($extension) - 4) . $extension;
        }
        return $filename;
    }

    public function isMinifiedFilename($filename)
    {
        return substr($filename, strrpos($filename, '.') - 4, 5) == '.min.';
    }

    public function isExcluded($filename)
    {
        foreach ($this->getExcludes(pathinfo($filename, PATHINFO_EXTENSION)) as $exclude) {
            if (preg_match('/' . str_replace('/', '\/', $exclude) . '/', $filename)) {
                return true;
            }
        }
        return false;
    }

    public function getExcludes($contentType)
    {
        if (!isset($this->configCache[self::XML_PATH_MINIFICATION_EXCLUDES][$contentType])) {
            $this->configCache[self::XML_PATH_MINIFICATION_EXCLUDES][$contentType] = [];
            $key = sprintf(self::XML_PATH_MINIFICATION_EXCLUDES, $contentType);
            $excludeValues = $this->getMinificationExcludeValues($key);
            foreach ($excludeValues as $exclude) {
                if (trim($exclude) != '') {
                    $this->configCache[self::XML_PATH_MINIFICATION_EXCLUDES][$contentType][] = trim($exclude);
                }
            }
        }
        return $this->configCache[self::XML_PATH_MINIFICATION_EXCLUDES][$contentType];
    }

    private function getMinificationExcludeValues($key)
    {
        $configValues = $this->scopeConfig->getValue($key, $this->scope) ?? [];
        //value used to be a string separated by 'newline' separator so we need to convert it to array
        if (!is_array($configValues)) {
            $configValuesFromString = [];
            foreach (explode("\n", $configValues) as $exclude) {
                if (trim($exclude) != '') {
                    $configValuesFromString[] = trim($exclude);
                }
            }
            $configValues = $configValuesFromString;
        }
        return array_values($configValues);
    }
}