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import { register, init, getLocaleFromNavigator } from 'svelte-i18n';
/** The list of locales to look for */
const localeCodes = ['en', 'fr'];
/** The directory where locale files are stored */
const localeDirectory = "../locales";
/**
* Adds a new locale from the appropriate JSON file
* @param {string} localeCode - the code of the locale to add
*/
function addLocale(localeCode) {
register(localeCode, () => import(`${localeDirectory}/${localeCode}.json`));
}
/**
* Determines the default locale.
* @param {string} navigatorLocale - the locale given by the navigator
* @param {array<string>} avalableLocales - a list of the available locales
* @returns {string} chosen default locale
*/
function pickLocale(navigatorLocale, availableLocales) {
// determine langugage part of locale
// (e.g. if navigatorLocale is 'en-US', languageCode is 'en')
let dashIndex = navigatorLocale ? navigatorLocale.indexOf("-") : -1;
let languageCode; // navigator locale without the regional part
if (dashIndex === -1) {
languageCode = navigatorLocale;
} else {
languageCode = navigatorLocale.slice(0, dashIndex);
}
// get locale
if (availableLocales.includes(navigatorLocale)) {
return navigatorLocale;
} else if (availableLocales.includes(languageCode)) {
return languageCode;
} else {
return null;
}
}
/**
* Loads all of the locales, picks a default locale, and sets up internationalization in that locale.
*/
export function setupI18n() {
localeCodes.forEach(addLocale);
let initialLocale = pickLocale(getLocaleFromNavigator(), localeCodes);
init({
fallbackLocale: 'en',
initialLocale: initialLocale,
});
}
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