@renderlesskit/react/dist/esm/calendar/helpers/useWeekStart.js

Collection of headless components/hooks that are accessible, composable, customizable from low level to build your own UI & Design System powered by Reakit

/**
 * All credit goes to [React Spectrum](https://github.com/adobe/react-spectrum)
 * We improved the Calendar from Stately [useWeekStart](https://github.com/adobe/react-spectrum/blob/main/packages/%40react-stately/calendar/src/useWeekStart.ts)
 * to work with Reakit System
 */
import { useLocale } from "@react-aria/i18n"; // Data from https://github.com/unicode-cldr/cldr-core/blob/master/supplemental/weekData.json
// Locales starting on Sunday have been removed for compression.

var data = {
  "001": 1,
  AD: 1,
  AE: 6,
  AF: 6,
  AI: 1,
  AL: 1,
  AM: 1,
  AN: 1,
  AT: 1,
  AX: 1,
  AZ: 1,
  BA: 1,
  BE: 1,
  BG: 1,
  BH: 6,
  BM: 1,
  BN: 1,
  BY: 1,
  CH: 1,
  CL: 1,
  CM: 1,
  CR: 1,
  CY: 1,
  CZ: 1,
  DE: 1,
  DJ: 6,
  DK: 1,
  DZ: 6,
  EC: 1,
  EE: 1,
  EG: 6,
  ES: 1,
  FI: 1,
  FJ: 1,
  FO: 1,
  FR: 1,
  GB: 1,
  GE: 1,
  GF: 1,
  GP: 1,
  GR: 1,
  HR: 1,
  HU: 1,
  IE: 1,
  IQ: 6,
  IR: 6,
  IS: 1,
  IT: 1,
  JO: 6,
  KG: 1,
  KW: 6,
  KZ: 1,
  LB: 1,
  LI: 1,
  LK: 1,
  LT: 1,
  LU: 1,
  LV: 1,
  LY: 6,
  MC: 1,
  MD: 1,
  ME: 1,
  MK: 1,
  MN: 1,
  MQ: 1,
  MV: 5,
  MY: 1,
  NL: 1,
  NO: 1,
  NZ: 1,
  OM: 6,
  PL: 1,
  QA: 6,
  RE: 1,
  RO: 1,
  RS: 1,
  RU: 1,
  SD: 6,
  SE: 1,
  SI: 1,
  SK: 1,
  SM: 1,
  SY: 6,
  TJ: 1,
  TM: 1,
  TR: 1,
  UA: 1,
  UY: 1,
  UZ: 1,
  VA: 1,
  VN: 1,
  XK: 1
};
export function useWeekStart() {
  var region = useRegion();
  return data[region] || 0;
}

function useRegion() {
  var {
    locale
  } = useLocale(); // If the Intl.Locale API is available, use it to get the region for the locale.
  // @ts-ignore

  if (Intl.Locale) {
    // @ts-ignore
    return new Intl.Locale(locale).maximize().region;
  } // If not, just try splitting the string.


  return locale.split("-")[1];
}
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