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YuruToot/app/javascript/mastodon/locales/load_locale.ts

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import { Semaphore } from 'async-mutex';
import type { LocaleData } from './global_locale';
import { isLocaleLoaded, setLocale } from './global_locale';
const localeLoadingSemaphore = new Semaphore(1);
export async function loadLocale() {
// eslint-disable-next-line @typescript-eslint/prefer-nullish-coalescing -- we want to match empty strings
const locale = document.querySelector<HTMLElement>('html')?.lang || 'en';
// We use a Semaphore here so only one thing can try to load the locales at
// the same time. If one tries to do it while its in progress, it will wait
// for the initial load to finish before it is resumed (and will see that locale
// data is already loaded)
await localeLoadingSemaphore.runExclusive(async () => {
// if the locale is already set, then do nothing
if (isLocaleLoaded()) return;
const localeData = (await import(
/* webpackMode: "lazy" */
/* webpackChunkName: "locales/vanilla/[request]" */
/* webpackInclude: /\.json$/ */
/* webpackPreload: true */
`mastodon/locales/${locale}.json`
)) as LocaleData['messages'];
setLocale({ messages: localeData, locale });
});
}