SingleFile.php

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<?php
namespace Magento\Theme\Model\Theme;

class SingleFile
{
    protected $_fileService;

    public function __construct(\Magento\Framework\View\Design\Theme\Customization\FileInterface $fileService)
    {
        $this->_fileService = $fileService;
    }

    public function update(\Magento\Framework\View\Design\ThemeInterface $themeModel, $fileContent)
    {
        $customFiles = $themeModel->getCustomization()->getFilesByType($this->_fileService->getType());
        $customCss = reset($customFiles);
        if (empty($fileContent) && $customCss) {
            $customCss->delete();
            return $customCss;
        }
        if (!$customCss) {
            $customCss = $this->_fileService->create();
        }
        $customCss->setData('content', $fileContent);
        $customCss->setTheme($themeModel);
        $customCss->save();
        return $customCss;
    }
}