CalendarEntry.js

const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const Promise = require('bluebird');

mongoose.Promise = Promise;

const CalendarEntrySchema = new Schema({
    url: String,
    game: {
        id: Number,
        name: String
    },
    type: {
        type: String,
        uppercase: true,
        default: 'RELEASE',
        enum: ['RELEASE', 'EVENT']
    },
    imageSrc: String,
    startDate: {type: Date, required: true, index: true},
    endDate: Date,
    tagLine: {type: String, required: true, index: {unique: true}},
    priority: {type: Number, default: 0},
    additionalInfo: Object
}, {timestamps: true});

const CalendarEntry = mongoose.model('CalendarEntry', CalendarEntrySchema, 'CalendarEntry');

module.exports = CalendarEntry;

calendarGenerator.js

const ical = require('ical-generator');

function saveCalendarICal(data, items) {
  const icalConfig = {
    domain: 'opencritic.com',
    prodId: {
      company: 'OpenCritic.com',
      product: data.title
    },
    name: 'OpenCritic Gaming Calendar'
  };
  const events = items.filter(item => item.type === 'RELEASE')
    .map(item => {
      item.startDate = new Date(item.startDate);
      return {
        start: item.startDate,
        end: new Date(item.startDate.getTime() + 3600000),
        summary: item.tagLine + ' Release',
        url: item.url,
        allDay: true,
        description: item.description
      }
    }).concat(
      items.filter(item => item.type === 'EVENT')
        .map(item => {
          item.startDate = new Date(item.startDate);
          item.endDate = new Date(item.endDate);
          return {
            start: item.startDate,
            end: new Date(item.endDate.getTime() + 3600000),
            summary: item.tagLine,
            url: item.url
          }
        }));
  const calendar = ical(icalConfig);
  return calendar.events(events).toString();
}