How to use loglevel - 10 common examples

var assert = require('assert')
var mockery = require('mockery')

var log = require('loglevel')
log.disableAll()

var param
var request = function (req) {
  param = req
}
request.post = function (req) {
  param = req
}

describe('Slackbot', function(){
  before(function() {
    mockery.enable({useCleanCache: true}); // Enable mockery at the start of your test suite
    mockery.registerMock('request', request);
    mockery.registerAllowables(['loglevel', 'events', '../../lib/slackbot.js', 'util']);
    slackbot = require('../../lib/slackbot.js')
  })

process.exit(1);
    }

    return result;
  }, {});

  await copyFiles(types, "types", {
    message:
      "Copying over the type definitions for the sassdoc package and the custom formatted sassdocs.",
    replace: name =>
      name
        .replace("types", "formattedSassDoc")
        .substring(name.indexOf("sassdoc/") + "sassdoc/".length),
  });

  log.info("Generating SassDoc files...");
  await Promise.all(
    Object.entries(combined).map(([name, formatted]) => {
      const fileName = `${toTitle(name)}SassDoc`;
      const filePath = path.join(
        documentationRoot,
        "constants",
        `${fileName}.ts`
      );

      const contents = format(`/* this is a generated file and shouldn't be manually updated */
import { PackageSassDoc } from "types/formattedSassDoc.d";

const ${fileName}: PackageSassDoc = ${JSON.stringify(formatted)};

export default ${fileName};
`);

const qs = require("querystring");
const md5 = require("md5");
const youdao_zh_2_en = "zh-CHS2EN";
process.env.NODE_ENV = "production";
// process.env.NODE_ENV = "dev";

let isDev = require("isdev");
const Preview = require("./Preview.jsx").default;

console.log("isDev:", isDev);

if (isDev) {
  log.setLevel("debug");
  log.debug("in Development");
} else {
  log.setLevel("silent");
  console.log("Not in Development!");
}

var getKeyWordReg = function(key) {
  return new RegExp(
    "([\\-_\\w\\d\\/\\$]{0,}){0,1}" + key + "([\\-_\\w\\d\\$]{0,}){0,1}",
    "gi"
  );
};

var showing_display = [];

const youdaoapi_url = "http://openapi.youdao.com/api";


var searchcode_axios = axios.create({

// TODO: label template storage
// TODO: command chaining
// TODO: command wiring to label object
// TODO: label may also contain width/height (for continuous media)

program
    .version('0.0.1')
    .option('-c, --content <content>', 'label content as JSON')
    .option('-j, --json ', 'JSON description of printing parameters')
    .option('-v, --verbose', 'ouput useful information', (v, total) =&gt; (total === 0) ? 0 : total-1, 2)
    .option('-t, --test', 'print a test label')
    .option('-c, --check', 'dry-run; do not send label to printer')
    .parse(process.argv);

console.log('loglevel: '+program.verbose);
log.setLevel(program.verbose);

var defaultPrinterModel = PRINTERS.ZEBRA_GX430T;
var defaultPrinter = Object.assign({
    name: 'Default Printer',
    address: '192.168.1.14'
}, defaultPrinterModel, program.json &amp;&amp; program.json.printer);
var defaultMedia = {
    width: 2 * 25.4,
    length: 1 * 25.4,
    // [thermal type]
    // [thickness?]
    // [price/label?]
    // [spool size]
    // [supply quantity]
    // [model / reorder number?]
};</content>

)

parser.addArgument(
  ['--prune-months'], {
    help: 'The amount of history (in number of months) to retain in Redshift',
    type: 'int'
  }
)

var args = parser.parseArgs()

if (args.debug) {
  log.setLevel('debug')
  log.debug('Debugging output enabled.')
} else {
  log.setLevel('info')
}
log.debug(`Resolved invocation arguments were:\n${util.inspect(args)}`)

if (args.specific !== null && args.prune_months !== null) {
  log.error('The "--specific" and "--prune-months" options are mutually exclusive.')
  log.error('--prune-months can only be invoked when importing the latest DBR.')
  log.error('Aborting.')
  process.exit(1)
}

// Instantiate a DBR object to work with.
var dbrClientOptions = {
  accessKeyId: args.source_key,
  secretAccessKey: args.source_secret
}

var log = require('loglevel')
var validator = require('validator')

var errorHandlers = require('../common/errorHandlers')
var settings = require('../common/settings.js')

// Change this to alter how much information is printed out
log.setLevel('trace')
log.enableAll()

console.log('server.js: Starting server.js')
console.log('server.js: Will require db.js')

try {
    var app = require('../common/microService.js')
    var db = require('../common/db.js')(log)

// add query handler API
    require('./serverApi.js')(app, db, log, validator) // configure our routes

// add test query handler API
    require('../tester/testerApi.js')(app, db, log, validator) // configure our routes

// Set port to 8080
    var port = settings.ETHEROSCOPESERVER.slice(-4)

define(function (require, exports, module) {
    "use strict";

    var loglevel = require("loglevel");

    /*eslint no-console:0*/

    if (__PG_DEBUG__) {
        // If the debug global is set, log messages at and below debug level
        loglevel.enableAll();

        if (!loglevel.hasOwnProperty("table")) {
            loglevel.table = console.table.bind(console);
        }
    } else {
        // Otherwise, only log information, warnings and errors
        loglevel.setLevel(loglevel.levels.INFO);
    }

    if (!loglevel.hasOwnProperty("timeStamp")) {
        loglevel.timeStamp = console.timeStamp.bind(console);
    }

    module.exports = loglevel;
});

var fs = require('fs');
var util = require('util');
var moment = require('moment');

// #### logging decoration ####
// see https://github.com/kutuluk/loglevel-plugin-prefix
const colors = {
  TRACE: chalk.magenta,
  DEBUG: chalk.cyan,
  INFO: chalk.blue,
  WARN: chalk.yellow,
  ERROR: chalk.red,
};

prefix.reg(log);
log.enableAll();

prefix.apply(log, {
    format(level, name, timestamp) {
        return `${chalk.gray(`[${timestamp}]`)} ${colors[level.toUpperCase()](level)} ${chalk.green(`${name}:`)}`;
    },
});

const WRITE_LOG = true;

var logBuf = "";
function writeLog(callback) {
    if (logBuf && WRITE_LOG) {
        fs.appendFile("log/" + moment(new Date()).format("MM-DD"), logBuf, function(err) {
            if (err) console.log("ERROR, could not write log to file log/" + moment(new Date()).format("MM-DD") + " : " + err);
            if (callback) callback();
        });

const loglevel = require('loglevel');

// -----------------------------------------------------------------------------
// Code
// -----------------------------------------------------------------------------

const colors = {
  trace: '',
  debug: '\x1b[90m',
  info: '\x1b[94m',
  warn: '\x1b[93m',
  error: '\x1b[91m',
};

const originalFactory = loglevel.methodFactory;
loglevel.methodFactory = (methodName, logLevel, loggerName) => {
  const rawMethod = originalFactory(methodName, logLevel, loggerName);
  return message => {
    // Getting stacktrace
    const err = new Error();
    const callerLine = err.stack.split('\n')[2];
    let invokeLocation = callerLine.match(/\(\/.*\)/);
    if (invokeLocation) {
      // Removing () brackets around line and replace core folder
      // where app is stored inside Docker container
      invokeLocation = invokeLocation[0].slice(1, -1).replace('/opt/app', '');
    } else {
      invokeLocation = '';
    }

    let prefix = '';

const loglevel = require('loglevel');

// -----------------------------------------------------------------------------
// Code
// -----------------------------------------------------------------------------

const colors = {
  trace: '',
  debug: '\x1b[90m',
  info: '\x1b[94m',
  warn: '\x1b[93m',
  error: '\x1b[91m',
};

const originalFactory = loglevel.methodFactory;
loglevel.methodFactory = (methodName, logLevel, loggerName) => {
  const rawMethod = originalFactory(methodName, logLevel, loggerName);
  return message => {
    // Getting stacktrace
    const err = new Error();
    const callerLine = err.stack.split('\n')[2];
    let invokeLocation = callerLine.match(/\(\/.*\)/);
    if (invokeLocation) {
      // Removing () brackets around line and replace core folder
      // where app is stored inside Docker container
      invokeLocation = invokeLocation[0].slice(1, -1).replace('/opt/app', '');
    } else {
      invokeLocation = '';
    }

    let prefix = '';
    if (process.env.NODE_ENV === 'development') {