Cannot modify logger format in TypeScript

Please tell us about your environment:

• winston version?
  • winston@2
  • winston@3
• node -v outputs: 8.9.4
• Operating System? macOS and Linux
• Language? TypeScript 2.7.2

What is the problem?

I want to be able to modify the default Logger of winston in my own log module and access that same logger from all other modules in my project. This worked just fine in Node, but I cannot modify the format in TypeScript.

When I try to customize the format, I receive the error

error 2339: Property ‘format’ does not exist on type ‘Winston’.

export const logger = new winston.Logger({
    level: 'debug',
    // same error on the next 3 lines
    format: winston.format.combine(
        winston.format.timestamp(),
        winston.format.json()
    ),
    transports: [
        new winston.transports.File({ filename: 'server_error.log', level: 'error' }),
        new winston.transports.File({ filename: 'server_all.log' })
    ]
});

What do you expect to happen instead?

This was the code I used in Node:

const winston = require('winston');

const logger = winston.createLogger({
	level: 'debug', // Levels: error: 0, warn: 1, info: 2, verbose: 3, debug: 4, silly: 5 
  	format: winston.format.combine(
		winston.format.timestamp(),
		winston.format.json()
	),
  	transports: [
    	new winston.transports.File({ filename: 'server_error.log', level: 'error'}),
    	new winston.transports.File({ filename: 'server_all.log'})
  	]
});

// If we're not in production then log to the `console` with the format:
// `${info.level}: ${info.message} JSON.stringify({ ...rest }) `
if (process.env.NODE_ENV !== 'production') {
  logger.add(new winston.transports.Console({
    format: winston.format.simple()
  }));
}

exports.logger = logger;

I expect the same format customization to work in TypeScript as well.

Other information

[algv]

Example:

import * as winston from "winston";
import { APP_LOG_FILE } from "./constants";

const logger = winston.createLogger({
  format: winston.format.combine(
    winston.format.timestamp(),
    winston.format.json(),
  ),
  level: "debug",
  transports: [
    new winston.transports.File({
      filename: APP_LOG_FILE,
      maxsize: 4096,
    }),
  ],
});

if (process.env.NODE_ENV !== "production") {
  logger.add(new winston.transports.Console({
    format: winston.format.simple(),
  }));
}

export default logger;

[davidpasztor]

Thanks, for the moment I added all 3 .d.ts files manually, which works fine and will update to RC6 as soon as its out!