How to use the cldr-core/supplemental/plurals.json.supplemental function in cldr-core

describe('Cardinal rules', () => {
    for (var lc in cardinalData.supplemental['plurals-type-cardinal']) {
      describe(lc, () => testPluralData('cardinal', lc, getPlural))
    }
  })

function extractPluralCategories() {
  let plurals = require('cldr-core/supplemental/plurals.json').supplemental['plurals-type-cardinal'];

  let pluralCategories = {};
  Object.keys(plurals).forEach(locale => {
    pluralCategories[locale] = Object.keys(plurals[locale]).map(key => key.replace('pluralRule-count-', ''));
  });

  return pluralCategories;
}

if (vars.length) fn = '    var ' + vars.join('\n    var ') + '\n' + fn

  fn = '  function (s/*: string | number */)/*: Rule */ {\n' + fn + 'other\n  }'
  var index = pluralFunctions.indexOf(fn)
  if (index < 0) {
    index = pluralFunctions.length
    pluralFunctions[index] = fn
  }

  return {
    data: data,
    func: index
  }
}

var pluralsTypeCardinal = pluralsJSON.supplemental['plurals-type-cardinal']
var pluralsTypeOrdinal = ordinalsJSON.supplemental['plurals-type-ordinal']
var locales = {}
var funcs = {}

for (var locale in pluralsTypeCardinal) {
  var cardinal = parseRules(pluralsTypeCardinal[locale])
  if (cardinal) {
    locales[locale] = { plurals: { cardinal: cardinal.data } }
    funcs[locale] = 'cardinal: f[' + cardinal.func + ']'
  }
}
for (var locale in pluralsTypeOrdinal) {
  var ordinal = parseRules(pluralsTypeOrdinal[locale])
  if (ordinal) {
    if (locales[locale]) {
      locales[locale].plurals.ordinal = ordinal.data