wrong chars inside .log file `` and `[39m` when using colorize()

• winston version?
  • winston@2
  • winston@3
• node -v outputs: v8.11.1
• Operating System? (Windows, macOS, or Linux): macOS
• Language? (all | TypeScript X.X | ES6/7 | ES5 | Dart): ES6

What is the problem?

When I add colorize(), my .log file contains  and [39m. Why is it happening?

This is my code:

'use strict';

const { format, createLogger, transports } = require('winston');

const logger = createLogger({
    format: format.combine(
        format.colorize({ all: true }),
        format.simple()
    ),
    transports: [
        new transports.File({ filename: 'combined.log' }),
        new transports.Console({ handleExceptions: true })
    ]
});

logger.info('Hello there. How are you?');
logger.info('Hello again distributed logs', {
    pippo: {
        pluto: 'cio',
        ooo: 2.4,
        sasas: [1, 2, 3],
        ole: {
            prova: true
        }
    }
});
logger.warn('some foobar level-ed message');
logger.error('some baz level-ed message');
logger.silly('some bar level-ed message');

This is the result log:

info: Hello there. How are you?
info: Hello again distributed logs {"pippo":{"pluto":"cio","ooo":2.4,"sasas":[1,2,3],"ole":{"prova":true}}}
warn: some foobar level-ed message
error: some baz level-ed message

Removing this line from my code: format.colorize({ all: true }) My log file become correct:

info: Hello there. How are you?
info: Hello again distributed logs {"pippo":{"pluto":"cio","ooo":2.4,"sasas":[1,2,3],"ole":{"prova":true}}}
warn: some foobar level-ed message
error: some baz level-ed message

What do you expect to happen instead?

Log file shouldn’t contains [32m and [39m