Passing winston logger instance to forRoot doesn't work

[Hareloo]

I have the following logger.ts file:

import winston from 'winston';

// Define the levels that can be used for logging
const levels = {
    error: 0,
    warn: 1,
    info: 2,
    http: 3,
    debug: 4,
};
  
// // In debug mode show all logs, otherwise show only warn and error
// const level = () => {
//     const env = process.env.NODE_ENV || 'development'
//     const isDevelopment = env === 'development'
//     return 'all'
//   }

// Define the color each level will be logged with
const colors = {
    error: 'red',
    warn: 'yellow',
    info: 'green',
    http: 'magenta',
    debug: 'white',
};

// Tell winston to use the colors we defined
winston.addColors(colors);

// Define the format in which we want to log
const format = winston.format.combine(
    winston.format.timestamp(),
    winston.format.colorize(),
    winston.format.json()
);

// Tell winston to log to console and to a file
const transports = [
    new winston.transports.Console(),
    new winston.transports.File({
        filename: './logs/auth.log',
        handleExceptions: true,
        maxsize: 5242880,
        maxFiles: 5,
        format: format
    })
];

const logger = winston.createLogger({
    level: 'debug',
    levels,
    format,
    transports
});

export default logger;

I then passed it to the forRoot method like so:

import logger from './lib/logger.js';
import { Module } from '@nestjs/common';
import { WinstonModule } from 'nest-winston';
import { AppController } from './app.controller.js';
import { AppService } from './app.service.js';
import { RabbitMqModule } from './rabbit-mq/rabbit-mq.module.js';

@Module({
  imports: [RabbitMqModule,
    WinstonModule.forRoot({
      instance: logger
    })],
  controllers: [AppController],
  providers: [AppService],
})
export class AppModule { }

It doesn't work, the transports don't get registered...
I think the problem is within the method createWinstonProviders, it always uses the factory of () => createLogger(...) instead of returning the instance if it was defined...

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