Devise\Support\Console\DeviseCacheCommand::handle PHP Method

    public function handle()
    {
        $cached = $this->RoutesGenerator->cacheRoutes();
        if (!$cached) {
            $this->info('');
            $this->info('   DEVISE_CACHE_ENABLED=true');
            $this->info('');
            $this->error('should be set in .env before route caching can be enabled on devise');
        }
    }