datezone/dist/output/cache.js

A lightweight and comprehensive date and timeZone utility library for JavaScript.

export const dtfCache = new Map();
export function getOptionsKey(opts) {
    // remove timeZone, sort remaining keys
    const { timeZone: _, ...rest } = opts;
    const ks = Object.keys(rest).sort();
    return ks.map((k) => `${k}:${rest[k]}`).join("|");
}
export function getCachedFormatter(timeZone, opts) {
    let zoneMap = dtfCache.get(timeZone);
    if (!zoneMap) {
        zoneMap = new Map();
        dtfCache.set(timeZone, zoneMap);
    }
    const key = getOptionsKey(opts);
    let fmt = zoneMap.get(key);
    if (!fmt) {
        fmt = new Intl.DateTimeFormat("en-US", { timeZone, ...opts });
        zoneMap.set(key, fmt);
    }
    return fmt;
}
// Cache for Intl.DateTimeFormat instances per locale and options
const dtfCacheLocale = new Map();
export function getCachedFormatterLocale(locale, opts) {
    const key = JSON.stringify(opts);
    let localeMap = dtfCacheLocale.get(locale);
    if (!localeMap) {
        localeMap = new Map();
        dtfCacheLocale.set(locale, localeMap);
    }
    let fmt = localeMap.get(key);
    if (!fmt) {
        fmt = new Intl.DateTimeFormat(locale, opts);
        localeMap.set(key, fmt);
    }
    return fmt;
}
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