Acme.BookStore.HttpApi.Host/node_modules/luxon/src/impl/locale.js

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import { hasFormatToParts, hasIntl, padStart, roundTo, hasRelative } from "./util.js";
import * as English from "./english.js";
import Settings from "../settings.js";
import DateTime from "../datetime.js";
import Formatter from "./formatter.js";

let intlDTCache = {};
function getCachedDTF(locString, opts = {}) {
  const key = JSON.stringify([locString, opts]);
  let dtf = intlDTCache[key];
  if (!dtf) {
    dtf = new Intl.DateTimeFormat(locString, opts);
    intlDTCache[key] = dtf;
  }
  return dtf;
}

let intlNumCache = {};
function getCachedINF(locString, opts = {}) {
  const key = JSON.stringify([locString, opts]);
  let inf = intlNumCache[key];
  if (!inf) {
    inf = new Intl.NumberFormat(locString, opts);
    intlNumCache[key] = inf;
  }
  return inf;
}

let intlRelCache = {};
function getCachedRTF(locString, opts = {}) {
  const { base, ...cacheKeyOpts } = opts; // exclude `base` from the options
  const key = JSON.stringify([locString, cacheKeyOpts]);
  let inf = intlRelCache[key];
  if (!inf) {
    inf = new Intl.RelativeTimeFormat(locString, opts);
    intlRelCache[key] = inf;
  }
  return inf;
}

let sysLocaleCache = null;
function systemLocale() {
  if (sysLocaleCache) {
    return sysLocaleCache;
  } else if (hasIntl()) {
    const computedSys = new Intl.DateTimeFormat().resolvedOptions().locale;
    // node sometimes defaults to "und". Override that because that is dumb
    sysLocaleCache = !computedSys || computedSys === "und" ? "en-US" : computedSys;
    return sysLocaleCache;
  } else {
    sysLocaleCache = "en-US";
    return sysLocaleCache;
  }
}

function parseLocaleString(localeStr) {
  // I really want to avoid writing a BCP 47 parser
  // see, e.g. https://github.com/wooorm/bcp-47
  // Instead, we'll do this: