I am using Winston for logging in my TypeScript application. I want to log errors with stack traces, even when the error is a string. Below is my current Winston setup and a sample controller function where I am throwing a string error.

Winston Setup:-

import { createLogger, format, transports } from "winston";
const { combine, timestamp, printf, colorize, errors } = format;

const logFormat = printf(({ level, message, timestamp, stack }) => {
  if (stack) {
    return `${timestamp} ${level}: ${message} - ${stack}`;
  }
  return `${timestamp} ${level}: ${message}`;
});

const logger = createLogger({
  format: combine(errors({ stack: true }), colorize(), timestamp(), logFormat),
  transports: [new transports.Console()],
});

export { logger };

**Controller Function :- **

async function addNewBreed(req: Request, res: Response) {
  try {
    const existing_breed = await BreedService.findBreed({
      where: {
        name: req.body.name,
      },
    });
    if (existing_breed) {
      throw localeKeys.BREED_ALREADY_EXISTS;
    }
    const created_breed = await BreedService.addNewBreed(req.body);
    return actionCompleteResponse({ res, data: created_breed });
  } catch (error) {
    logger.error("addNewBreed", error);
    return sendError({ res, error });
  }
}

localKeys.ts :-

{
BREED_ALREADY_EXISTS: “Breed already exists.”,
}

Problem :-

When I throw an error using a string from my localization file (localeKeys.BREED_ALREADY_EXISTS), Winston logs the error message but does not include the stack trace. How can I ensure that Winston logs stack traces for string errors as well ?

Attempts :-

I have tried using the errors({ stack: true }) format in Winston, but it doesn’t seem to work for string errors.