Node.js Google timezone API wrapper

google-timezone.js

'use strict'

const request = require('request-promise');

module.exports = TimeZone;

function TimeZone(options) {
  if(!options.apiKey) {
    throw new Error('api key is required');
  }

  if (!(this instanceof TimeZone)) {
    return new TimeZone();
  }

  this.url = 'https://maps.googleapis.com/maps/api/timezone/json';
  this.apiKey = options.apiKey;
}

function validateOptions(options) {
  if(!options.lat) { throw new Error('lat parameter is required') }
  if(!options.lon) { throw new Error('lon parameter is required') }
  if(!options.timestamp) { throw new Error('timestamp parameter is required') }
}

TimeZone.prototype.get = function(options) {
  validateOptions(options);

  let rOptions = {
    uri: this.url,
    qs: {
      location: `${options.lat},${options.lon}`,
      timestamp: options.timestamp,
      key: this.apiKey
    },
    json: true
  }

  return request(rOptions);
}