ManuGowda commented on this pull request.
> + * Copyright © 2018 Lisk Foundation
+ * See the LICENSE file at the top-level directory of this distribution
+ * for licensing information.
+ * Unless otherwise agreed in a custom licensing agreement with the Lisk Foundation,
+ * no part of this software, including this file, may be copied, modified,
+ * propagated, or distributed except according to the terms contained in the
+ * LICENSE file.
+ * Removal or modification of this copyright notice is prohibited.
+var fs = require(‘fs’);
same here, use const and let at required places