Console/Command/EnableCommand.php
private function enableFastly()
    {
        $this->configWriter->save('system/full_page_cache/caching_application', Config::FASTLY);
        $this->output->writeln(
            '<info>Fastly Caching Application Activated.</info>',
            OutputInterface::OUTPUT_NORMAL
        );
    }
private function enableFastly()
    {
        $this->configWriter->save('system/full_page_cache/caching_application', Config::FASTLY);
        $this->output->writeln(
            '<info>Fastly Caching Application Activated.</info>',
            OutputInterface::OUTPUT_NORMAL
        );
    }
Enable Fastly