self.log not a function

[jaumard]

Please tell us about your environment:

• winston version?
  • winston@2
  • winston@3
• _node -v outputs: v10.15.3
• _Operating System: macOS
• _Language: ES6/7

What is the problem?

Previously with winston@2 I was doing like this: log.debug.apply(this, ['lisa-plugin-hue', 'preferences', {}]) but now with the v3 it gave me this:

TypeError: self.log is not a function
    at Object.DerivedLogger.(anonymous function) (/Users/jaumard/IdeaProjects/lisa-box/node_modules/winston/lib/winston/create-logger.js:95:19)
    at Object.<anonymous> (/Users/jaumard/IdeaProjects/lisa-box/test.js:15:11)
    at Module._compile (internal/modules/cjs/loader.js:701:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:712:10)
    at Module.load (internal/modules/cjs/loader.js:600:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:539:12)
    at Function.Module._load (internal/modules/cjs/loader.js:531:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:754:12)
    at startup (internal/bootstrap/node.js:283:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:622:3)

Here is how to reproduce:

const winston = require('winston')

const log = winston.createLogger({
  level: 'debug',
  exitOnError: true,
  transports: [
    new (winston.transports.Console)({
      prettyPrint: true,
      colorize: true
    })
  ]
})

log.debug.apply(this, ['lisa-plugin-hue', 'preferences', {}])

What do you expect to happen instead?

Have the log and no crash :)

Other information

Maybe I need to adapt my code now if it doesn't work the same way as v2 ?

[EricRabil]

Logger functions aren't bound to the logger object, so in that example you would need to change log.debug.apply(this, ...) to log.debug.apply(log, ...) so that the function is executed with the correct this or self variable.

[stonebinox]

This isn't fixed yet? Can't use the workaround when another library invokes it.

[wbt]

#FundOpenSource