TemplateHintsEnableCommand.php

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<?php
namespace Magento\Developer\Console\Command;

use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;
use Magento\Framework\App\Config\ConfigResource\ConfigInterface;

class TemplateHintsEnableCommand extends Command
{

    const COMMAND_NAME = 'dev:template-hints:enable';

    const SUCCESS_MESSAGE = "Template hints enabled.";

    private $resourceConfig;

    public function __construct(ConfigInterface $resourceConfig)
    {
        parent::__construct();
        $this->resourceConfig = $resourceConfig;
    }

    protected function configure()
    {
        $this->setName(self::COMMAND_NAME)
            ->setDescription('Enable frontend template hints. A cache flush might be required.');

        parent::configure();
    }

    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $this->resourceConfig->saveConfig('dev/debug/template_hints_storefront', 1, 'default', 0);
        $output->writeln("<info>". self::SUCCESS_MESSAGE . "</info>");
    }
}