How to use formatjs-extract-cldr-data - 10 common examples

import * as fs from 'fs';
import * as p from 'path';
import {sync as mkdirpSync} from 'mkdirp';
import extractCLDRData from 'formatjs-extract-cldr-data';
import serialize from 'serialize-javascript';
import {rollup} from 'rollup';
import virtual from 'rollup-plugin-virtual';
import ProgressBar from 'progress';
import PromiseQueue from 'promise-queue';

const DEFAULT_LOCALE = 'en';
const CONCURRENCY = require('os').cpus().length - 1;

const cldrData = extractCLDRData({
  relativeFields: true,
});

const cldrDataByLocale = new Map(
  Object.keys(cldrData).map(locale => [locale, cldrData[locale]])
);

const cldrDataByLang = [...cldrDataByLocale].reduce((map, [locale, data]) => {
  const [lang] = locale.split('-');
  const langData = map.get(lang) || [];
  return map.set(lang, langData.concat(data));
}, new Map());

function createDataModule(localeData) {
  return `// GENERATED FILE
export default ${serialize(localeData)};

gulp.task("build-data", [ "clean-data" ], function()
{
  let data = extractData(
  {
    pluralRules: true,
    relativeFields: true
  })

  fs.mkdirSync("data")

  return Promise.all(map(data, (value, locale) =>
  {
    return new Promise((resolve) =>
    {
      let stringified = stringify(value, null, "  ")
      let result = `"use strict";Object.defineProperty(exports,"__esModule",{value:true});exports.default=${stringified};`

      fs.writeFile(`data/${locale}.js`, result, function(err)
      {