How to use app-store-scraper - 2 common examples

return new Promise((resolve, reject) => {
    if (store === 'itunes') {
      itunes.app({
        appId: opt.appId,
        country: opt.country, // TODO: Support more countries
      })
        .then((data) => {
          setMetrics(store, opt.country, data) // TODO: Support more countries
            .then(resolve)
            .catch(reject);
        })
        .catch((err) => {
          reject(new Error(`Itunes Scraper error for the app "${opt.appId}" (${opt.country}): ${err.message}`));
        });
    }

    if (store === 'gplay') {
      gplay.app({
        appId: opt.appId,

'use strict';

// FIXME don't force memoization
const itunes = require('app-store-scraper').memoized();
const R = require('ramda');
const calc = require('../calc');
const debug = require('debug')('aso');

/*
* An object that holds all store-specific parts of the algorithms exposed by
* the library. This is not the most elegant solution ever, but beats introducing
* hierarchies and inheritance. If these objects grow too big it's probably better
* to break them into more cohessive components, maybe with defaults for the
* common stuff.
*/

const getCollection = (app) => app.free ? itunes.collection.TOP_FREE_IOS : itunes.collection.TOP_PAID_IOS;
const getGenre = (app) => app.primaryGenreId;

function buildStore (defaults) {