chatIM/src/core/logger.js

import { transports, createLogger, format } from "winston";
import cluster from "cluster";
import path from "path";
import { join, dirname } from "path";
import { fileURLToPath } from "url";
const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);

const formatMeta = (meta) => {
  // You can format the splat yourself
  const splat = meta[Symbol.for("splat")];
  if (splat && splat.length) {
    return splat.length === 1 ? JSON.stringify(splat[0]) : JSON.stringify(splat);
  }
  return "";
};

const customFormat = format.printf(({ timestamp, level, message, label = "", ...meta }) => `[${timestamp}] ${level} ${label} ${message} ${formatMeta(meta)}`);

const logger = createLogger({
  level: "debug",

  format: format.combine(
    format.colorize(),
    format.timestamp({ format: "MMM D, YYYY HH:mm:ss.SSS" }),
    customFormat,
    // Do not use splat format
  ),
  transports: [
    // - Write all logs with importance level of `error` or less to `error.log`
    // - Write all logs with importance level of `info` or less to `combined.log`
    //
    new transports.Console(),
    new transports.File({ filename: join(__dirname, "../../logs/error.log"), level: "error" }),
    new transports.File({
      filename: join(__dirname, "../../logs/combined.log"),
    }),
  ],
});
export { logger };