create-new-express-app/templates/app-ts/src/utils/logger.ts

A CLI tool to create a TypeScript Express application with best practices

import winston from "winston";
// import * as path from "path";
// import * as fs from "fs";

// const logDir = path.join(__dirname, "../utils/logs");

const levels = {
  error: 0,
  warn: 1,
  info: 2,
  http: 3,
  debug: 4,
};

const level = () => {
  const env = process.env.NODE_ENV || "development";
  const isDevelopment = env === "development";
  return isDevelopment ? "debug" : "warn";
};

const colors = {
  error: "red",
  warn: "yellow",
  info: "green",
  http: "bold cyan",
  debug: "white",
};

winston.addColors(colors);

const format = winston.format.combine(
  winston.format.timestamp({ format: "YYYY-MM-DD HH:mm:ss:ms" }),
  winston.format.colorize({ all: true }),
  winston.format.printf((info) => `${info.timestamp} ${info.level}: ${info.message}`)
);

const transports = [
  new winston.transports.Console(),
  // new winston.transports.File({
  //   filename: "./src/v1/utils/logs/error.log",
  //   level: "error",
  // }),
  // new winston.transports.File({ filename: "./src/v1/utils/logs/all.log" }),
];

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

export default logger;