log4js, setting sample

logger.js

const log4js = require("log4js");

let dt = Date.now();
let LOG_FILE_NAME = "log_" + dt;
console.log("dt=", dt);
//
log4js.configure({
  appenders: { 
    cheese: { type: "file", filename: "cheese.log" } ,
    app: { type: "file", filename: `log/${LOG_FILE_NAME}.log` } 
  },
  categories: { default: { appenders: ["app"], level: "DEBUG" } }
});
const logger = log4js.getLogger("app");

module.exports = logger;

t1.test.js

const logger = require('./logger');

//
logger.debug("Entering cheese testing");
logger.error("error_123");
logger.info("info_123");