Add useFormatCurrency hook (#6978)

src/lib/currency.ts

···
+import React from 'react'
+
+import {deviceLocales} from '#/locale/deviceLocales'
+import {useGeolocation} from '#/state/geolocation'
+import {useLanguagePrefs} from '#/state/preferences'
+
+/**
+ * From react-native-localize
+ *
+ * MIT License
+ * Copyright (c) 2017-present, Mathieu Acthernoene
+ *
+ * @see https://github.com/zoontek/react-native-localize/blob/master/LICENSE
+ * @see https://github.com/zoontek/react-native-localize/blob/ee5bf25e0bb8f3b8e4f3fd055f67ad46269c81ea/src/constants.ts
+ */
+export const countryCodeToCurrency: Record<string, string> = {
+  ad: 'eur',
+  ae: 'aed',
+  af: 'afn',
+  ag: 'xcd',
+  ai: 'xcd',
+  al: 'all',
+  am: 'amd',
+  an: 'ang',
+  ao: 'aoa',
+  ar: 'ars',
+  as: 'usd',
+  at: 'eur',
+  au: 'aud',
+  aw: 'awg',
+  ax: 'eur',
+  az: 'azn',
+  ba: 'bam',
+  bb: 'bbd',
+  bd: 'bdt',
+  be: 'eur',
+  bf: 'xof',
+  bg: 'bgn',
+  bh: 'bhd',
+  bi: 'bif',
+  bj: 'xof',
+  bl: 'eur',
+  bm: 'bmd',
+  bn: 'bnd',
+  bo: 'bob',
+  bq: 'usd',
+  br: 'brl',
+  bs: 'bsd',
+  bt: 'btn',
+  bv: 'nok',
+  bw: 'bwp',
+  by: 'byn',
+  bz: 'bzd',
+  ca: 'cad',
+  cc: 'aud',
+  cd: 'cdf',
+  cf: 'xaf',
+  cg: 'xaf',
+  ch: 'chf',
+  ci: 'xof',
+  ck: 'nzd',
+  cl: 'clp',
+  cm: 'xaf',
+  cn: 'cny',
+  co: 'cop',
+  cr: 'crc',
+  cu: 'cup',
+  cv: 'cve',
+  cw: 'ang',
+  cx: 'aud',
+  cy: 'eur',
+  cz: 'czk',
+  de: 'eur',
+  dj: 'djf',
+  dk: 'dkk',
+  dm: 'xcd',
+  do: 'dop',
+  dz: 'dzd',
+  ec: 'usd',
+  ee: 'eur',
+  eg: 'egp',
+  eh: 'mad',
+  er: 'ern',
+  es: 'eur',
+  et: 'etb',
+  fi: 'eur',
+  fj: 'fjd',
+  fk: 'fkp',
+  fm: 'usd',
+  fo: 'dkk',
+  fr: 'eur',
+  ga: 'xaf',
+  gb: 'gbp',
+  gd: 'xcd',
+  ge: 'gel',
+  gf: 'eur',
+  gg: 'gbp',
+  gh: 'ghs',
+  gi: 'gip',
+  gl: 'dkk',
+  gm: 'gmd',
+  gn: 'gnf',
+  gp: 'eur',
+  gq: 'xaf',
+  gr: 'eur',
+  gs: 'gbp',
+  gt: 'gtq',
+  gu: 'usd',
+  gw: 'xof',
+  gy: 'gyd',
+  hk: 'hkd',
+  hm: 'aud',
+  hn: 'hnl',
+  hr: 'hrk',
+  ht: 'htg',
+  hu: 'huf',
+  id: 'idr',
+  ie: 'eur',
+  il: 'ils',
+  im: 'gbp',
+  in: 'inr',
+  io: 'usd',
+  iq: 'iqd',
+  ir: 'irr',
+  is: 'isk',
+  it: 'eur',
+  je: 'gbp',
+  jm: 'jmd',
+  jo: 'jod',
+  jp: 'jpy',
+  ke: 'kes',
+  kg: 'kgs',
+  kh: 'khr',
+  ki: 'aud',
+  km: 'kmf',
+  kn: 'xcd',
+  kp: 'kpw',
+  kr: 'krw',
+  kw: 'kwd',
+  ky: 'kyd',
+  kz: 'kzt',
+  la: 'lak',
+  lb: 'lbp',
+  lc: 'xcd',
+  li: 'chf',
+  lk: 'lkr',
+  lr: 'lrd',
+  ls: 'lsl',
+  lt: 'eur',
+  lu: 'eur',
+  lv: 'eur',
+  ly: 'lyd',
+  ma: 'mad',
+  mc: 'eur',
+  md: 'mdl',
+  me: 'eur',
+  mf: 'eur',
+  mg: 'mga',
+  mh: 'usd',
+  mk: 'mkd',
+  ml: 'xof',
+  mm: 'mmk',
+  mn: 'mnt',
+  mo: 'mop',
+  mp: 'usd',
+  mq: 'eur',
+  mr: 'mro',
+  ms: 'xcd',
+  mt: 'eur',
+  mu: 'mur',
+  mv: 'mvr',
+  mw: 'mwk',
+  mx: 'mxn',
+  my: 'myr',
+  mz: 'mzn',
+  na: 'nad',
+  nc: 'xpf',
+  ne: 'xof',
+  nf: 'aud',
+  ng: 'ngn',
+  ni: 'nio',
+  nl: 'eur',
+  no: 'nok',
+  np: 'npr',
+  nr: 'aud',
+  nu: 'nzd',
+  nz: 'nzd',
+  om: 'omr',
+  pa: 'pab',
+  pe: 'pen',
+  pf: 'xpf',
+  pg: 'pgk',
+  ph: 'php',
+  pk: 'pkr',
+  pl: 'pln',
+  pm: 'eur',
+  pn: 'nzd',
+  pr: 'usd',
+  ps: 'ils',
+  pt: 'eur',
+  pw: 'usd',
+  py: 'pyg',
+  qa: 'qar',
+  re: 'eur',
+  ro: 'ron',
+  rs: 'rsd',
+  ru: 'rub',
+  rw: 'rwf',
+  sa: 'sar',
+  sb: 'sbd',
+  sc: 'scr',
+  sd: 'sdg',
+  se: 'sek',
+  sg: 'sgd',
+  sh: 'shp',
+  si: 'eur',
+  sj: 'nok',
+  sk: 'eur',
+  sl: 'sll',
+  sm: 'eur',
+  sn: 'xof',
+  so: 'sos',
+  sr: 'srd',
+  ss: 'ssp',
+  st: 'std',
+  sv: 'svc',
+  sx: 'ang',
+  sy: 'syp',
+  sz: 'szl',
+  tc: 'usd',
+  td: 'xaf',
+  tf: 'eur',
+  tg: 'xof',
+  th: 'thb',
+  tj: 'tjs',
+  tk: 'nzd',
+  tl: 'usd',
+  tm: 'tmt',
+  tn: 'tnd',
+  to: 'top',
+  tr: 'try',
+  tt: 'ttd',
+  tv: 'aud',
+  tw: 'twd',
+  tz: 'tzs',
+  ua: 'uah',
+  ug: 'ugx',
+  um: 'usd',
+  us: 'usd',
+  uy: 'uyu',
+  uz: 'uzs',
+  va: 'eur',
+  vc: 'xcd',
+  ve: 'vef',
+  vg: 'usd',
+  vi: 'usd',
+  vn: 'vnd',
+  vu: 'vuv',
+  wf: 'xpf',
+  ws: 'wst',
+  ye: 'yer',
+  yt: 'eur',
+  za: 'zar',
+  zm: 'zmw',
+  zw: 'zwl',
+}
+
+/**
+ * Best-guess currency formatting.
+ *
+ * Attempts to use `getLocales` from `expo-localization` if available,
+ * otherwise falls back to the `persisted.appLanguage` setting, and geolocation
+ * API for region.
+ */
+export function useFormatCurrency(
+  options?: Parameters<typeof Intl.NumberFormat>[1],
+) {
+  const {geolocation} = useGeolocation()
+  const {appLanguage} = useLanguagePrefs()
+  return React.useMemo(() => {
+    const locale = deviceLocales.at(0)
+    const languageTag = locale?.languageTag || appLanguage || 'en-US'
+    const countryCode = (
+      locale?.regionCode ||
+      geolocation?.countryCode ||
+      'us'
+    ).toLowerCase()
+    const currency = countryCodeToCurrency[countryCode] || 'usd'
+    const format = new Intl.NumberFormat(languageTag, {
+      ...(options || {}),
+      style: 'currency',
+      currency: currency,
+    }).format
+
+    return {
+      format,
+      currency,
+      countryCode,
+      languageTag,
+    }
+  }, [geolocation, appLanguage, options])
+}