Write logs to files

src/helpers/logger.ts

@@ -2,7 +2,11 @@ import winston from 'winston'
 
 export default winston.createLogger({
   level: 'debug',
-  transports: [new winston.transports.Console()],
+  transports: [
+    new winston.transports.Console(),
+    new winston.transports.File({ filename: 'warn.log', level: 'warn' }),
+    new winston.transports.File({ filename: 'combined.log' }),
+  ],
   format: winston.format.combine(
     winston.format.colorize({ all: true }),
     winston.format.simple()