countries-utils.ts

countries-utils.ts

import nationalities from 'i18n-nationality/langs/en.json'
import countries from 'i18n-iso-countries/langs/en.json'
import {
  getName as getNationality,
  registerLocale as registerNationality
} from 'i18n-nationality'
import {
  getName as getCountry,
  registerLocale as registerCountry
} from 'i18n-iso-countries'
import {getNames as getNationalities} from 'i18n-nationality'
import {getNames as getCountries} from 'i18n-iso-countries'

type UpperCaseCharacter =
  | 'A'
  | 'B'
  | 'C'
  | 'D'
  | 'E'
  | 'F'
  | 'G'
  | 'H'
  | 'I'
  | 'J'
  | 'K'
  | 'L'
  | 'M'
  | 'N'
  | 'O'
  | 'P'
  | 'Q'
  | 'R'
  | 'S'
  | 'T'
  | 'U'
  | 'V'
  | 'W'
  | 'X'
  | 'Y'
  | 'Z'
  
export type IsoCode = `${UpperCaseCharacter}${UpperCaseCharacter}`

registerCountry(countries)
registerNationality(nationalities)

export const isoToCountryName = (iso: IsoCode) => getCountry(iso, 'en')
export const isoToNationalityName = (iso: IsoCode) => getNationality(iso, 'en')
export const listNationalities = () => getNationalities('en') as {[_ in IsoCode]: string}
export const listCountries = () => getCountries('en') as {[_ in IsoCode]: string}
export const listNationalitiesArray = () => Object.entries(listNationalities()) as [IsoCode, string][]
export const listCountriesArray = () => Object.entries(listCountries()) as [IsoCode, string][]

// TESTS

import {
  isoToCountryName,
  isoToNationalityName,
  listCountries,
  listCountriesArray,
  listNationalities,
  listNationalitiesArray
} from '@src/localization-utils'
import {expect} from 'chai'

describe('Country ISO Codes', () => {
  it('can be converted to country name', () => {
    expect(isoToCountryName('PL')).equals('Poland')
  })

  it('can be converted to nationality name', () => {
    expect(isoToNationalityName('PL')).equals('Polish')
  })

  it('countries can be listed', () => {
    let countries = listCountries()
    expect(countries['PL']).to.equal('Poland')
    expect(countries.DK).to.equal('Denmark')
  })

  it('nationalities can be listed', () => {
    let nationalities = listNationalities()
    expect(nationalities['PL']).to.equal('Polish')
    expect(nationalities.DK).to.equal('Danish')
  })

  it('nationalities array can be retrieved', () => {
    let nationalities = listNationalitiesArray()
    expect(nationalities.filter(([iso, _]) => iso == 'PL')[0][1]).to.equal(
      'Polish'
    )
  })

  it('countries array can be retrieved', () => {
    let countries = listCountriesArray()
    expect(countries.filter(([iso, _]) => iso == 'PL')[0][1]).to.equal('Poland')
  })
})