FrontendCompilation.php

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<?php
namespace Magento\Developer\Model\View\Asset\PreProcessor;

use Magento\Framework\View\Asset\File\FallbackContext;
use Magento\Framework\View\Asset\PreProcessor;
use Magento\Framework\View\Asset\PreProcessorInterface;
use Magento\Framework\View\Asset\LockerProcessInterface;
use Magento\Framework\View\Asset\PreProcessor\AlternativeSourceInterface;
use Magento\Framework\View\Asset\PreProcessor\AlternativeSource\AssetBuilder;
use Magento\Framework\View\Asset\Source;

class FrontendCompilation implements PreProcessorInterface
{
    private $alternativeSource;

    private $assetBuilder;

    private $lockerProcess;

    private $lockName;

    private $assetSource;

    public function __construct(
        Source $assetSource,
        AssetBuilder $assetBuilder,
        AlternativeSourceInterface $alternativeSource,
        LockerProcessInterface $lockerProcess,
        $lockName
    ) {
        $this->assetSource = $assetSource;
        $this->alternativeSource = $alternativeSource;
        $this->assetBuilder = $assetBuilder;
        $this->lockerProcess = $lockerProcess;
        $this->lockName = $lockName;
    }

    public function process(PreProcessor\Chain $chain)
    {

        try {
            $this->lockerProcess->lockProcess($this->lockName);

            $path = $chain->getAsset()->getFilePath();
            $module = $chain->getAsset()->getModule();

            $context = $chain->getAsset()->getContext();

            $result = $this->processContent($path, $chain->getContent(), $module, $context);
            $chain->setContent($result['content']);
            $chain->setContentType($result['sourceType']);
        } finally {
            $this->lockerProcess->unlockProcess();
        }
    }

    private function processContent($path, $content, $module, FallbackContext $context)
    {
        $sourceTypePattern = '#\.' . preg_quote(pathinfo($path, PATHINFO_EXTENSION), '#') . '$#';

        foreach ($this->alternativeSource->getAlternativesExtensionsNames() as $name) {
            $asset = $this->assetBuilder->setArea($context->getAreaCode())
                ->setTheme($context->getThemePath())
                ->setLocale($context->getLocale())
                ->setModule($module)
                ->setPath(preg_replace($sourceTypePattern, '.' . $name, $path))
                ->build();

            $processedContent = $this->assetSource->getContent($asset);

            if (trim($processedContent) !== '') {
                return [
                    'content' => $processedContent,
                    'sourceType' => $name
                ];
            }
        }

        return [
            'content' => $content,
            'sourceType' => pathinfo($path, PATHINFO_EXTENSION)
        ];
    }
}