Source: utilities/index.js

import { transports, createLogger, format } from 'winston';

import { LOG_LEVEL } from './env.js';

let tempLogger;
try {
  const { combine, label, printf, colorize } = format;

  /* Logger setup */
  const transport = new transports.Console();
  const logFormat = printf((info) => `[${info.label}] ${info.level}: ${info.message}`);
  tempLogger = createLogger({
    format: combine(colorize(), label({ label: 'WS'.brightBlue }), logFormat),
    transports: [transport],
  });
  tempLogger.level = LOG_LEVEL;
} catch (e) {
  tempLogger = console;
}

export const logger = tempLogger;

/**
 * Group an array by a field value
 * @param  {Object[]} array array of objects to broup
 * @param  {string} field field to group by
 * @returns {Object}       [description]
 */
export const groupBy = (array, field) => {
  const grouped = {};
  if (!array) return undefined;
  array.forEach((item) => {
    const fVal = item[field];
    if (!grouped[fVal]) {
      grouped[fVal] = [];
    }
    grouped[fVal].push(item);
  });
  return grouped;
};

const allowedDeviation = 30000;
/**
 * Validate that b is between a and c
 * @param  {Date} a The first Date, should be the last time things were updated
 * @param  {Date} b The second Date, should be the activation time of an event
 * @param  {Date} c The third Date, should be the start time of this update cycle
 * @returns {boolean}   if the event date is between the server start time and the last update time
 */
export const between = (a, b, c = new Date()) => b + allowedDeviation > a && b - allowedDeviation < c;

/**
 * Returns the number of milliseconds between now and a given date
 * @param   {string} d         The date from which the current time will be subtracted
 * @param   {function} [now] A function that returns the current UNIX time in milliseconds
 * @returns {number}
 */
export function fromNow(d, now = Date.now) {
  return new Date(d).getTime() - now();
}

/**
 * Map of last updated dates/times
 * @type {Object}
 */
export const lastUpdated = {
  pc: {
    en: 0, // Date.now(),
  },
  ps4: {
    en: Date.now(),
  },
  xb1: {
    en: Date.now(),
  },
  swi: {
    en: Date.now(),
  },
};