Winston 3.2 Uncaught TypeError: fs.existsSync is not a function

• _winston version 3.2
• _Operating System? macOS
• Node JS, React framework

What is the problem?

winstonLogger.Log() fails with the exception:

Uncaught TypeError: fs.existsSync is not a function
at File._createLogDirIfNotExist (file.js:804)
at new File (file.js:132)
at Object. (mylogger.js:16)
at webpack_require (bootstrap 284d16fcfe1dcfa44176:676)
at fn (bootstrap 284d16fcfe1dcfa44176:87)
at Object. (mymodule.js:5)
at webpack_require (bootstrap 284d16fcfe1dcfa44176:676)
at fn (bootstrap 284d16fcfe1dcfa44176:87)
at Object. (app.js:21)
at webpack_require (bootstrap 284d16fcfe1dcfa44176:676)

What do you expect to happen instead?

I expect the .log() function to log to a file transport

Other information

[dwalintukan]

I am experiencing similar logs with Webpack 4. It breaks my React app entirely.

file.js:804 Uncaught TypeError: fs.existsSync is not a function
    at File._createLogDirIfNotExist (file.js:804)
    at new File (file.js:132)
    at eval (logger.js:18)
    at Module../src/utils/logger.js (bundle.js:72383)
    at __webpack_require__ (bundle.js:20)
    at eval (index.js:11)
    at Module../src/localization/index.js (bundle.js:72133)
    at __webpack_require__ (bundle.js:20)
    at eval (index.js:14)
    at Module../src/index.js (bundle.js:72110)

[oshiniG]

Is there any solution for this TypeError: fs.existsSync is not a function error? what is the default file location ?

import winston from "winston";

const logger = winston.createLogger({
  level: 'info',
  format: winston.format.json(),
  defaultMeta: { service: 'user-service' },
  transports: [
    new winston.transports.File({ filename: 'error.log', level: 'error' }),
    new winston.transports.File({ filename: 'combined.log' })
  ]
});