morgan

As you mention, you are using 3.0.0, you can not not use winston.Logger, you may refer library code( https://github.com/winstonjs/winston/blob/master/lib/winston.js#L178 ) You need to make small update in your code, use winston.createLogger instead of new (winston.Logger) // your centralized logger object let logger = winston.createLogger({ transports: [ new (winston.transports.Console)(options.console), new (winston.transports.File)(options.errorFile), new (winston.transports.File)(options.file) ], exitOnError: false, … Read more