Testing logging nested metadata objects in winston, auto collected to application insights

winston_app_insights.ts

import * as util from "util";
const appInsights = require("applicationinsights");
appInsights.setup("instrumentationKey");
appInsights.start();

const winston = require("winston");
const testLogger1 = new winston.Logger();

const consoleTransport = new winston.transports.Console({
  level: "info",
  colorize: true,
  json: false,
  timestamp: true
});

function metaDataStringifier(level: string, msg: string, meta: any) {
  if (typeof meta === "object") {
    for (const field of Object.keys(meta)) {
      const property = meta[field];
      if (typeof property === "object") {
        meta[field] = util.inspect(property, { depth: null });
      }
    }
  }
  return meta;
}

testLogger1.configure({
  transports: [
    consoleTransport
  ],
  rewriters: [metaDataStringifier],
  level: "silly",
  exitOnError: true // exit application after logging unhandled exception
});

const aComplexObject = {
  message: "i am out!",
  innerObject: {
    message: "i am in!",
    innerObject2: {
      message: "i am in2!",
      innerObject3: {
        message: "i am in3!",
        innerObject4: { message: "i am in4!" },
        }
    }
  }
};

testLogger1.info(aComplexObject, aComplexObject);