@appsemble/node-utils/getAppsembleMessages.js

NodeJS utilities used by Appsemble internally.

import { readdir, readFile } from 'node:fs/promises';
import { defaultLocale } from '@appsemble/utils';
const translationsDir = new URL('../../i18n/', import.meta.url);
export async function getSupportedLanguages() {
    const files = await readdir(translationsDir);
    return new Set(files.map((lang) => lang.split('.json')[0].toLowerCase()));
}
/**
 * Fetch and merge the Appsemble core messages based on a language and a base language.
 *
 * @param language The language to get the messages of.
 * @param baseLanguage The base language of the language to get the messages of.
 * @returns The Appsemble core messages.
 */
export async function getAppsembleMessages(language, baseLanguage) {
    const lang = language.toLowerCase();
    const baseLang = baseLanguage?.toLowerCase();
    const languages = await getSupportedLanguages();
    const messages = {};
    // @ts-expect-error 2345 argument of type is not assignable to parameter of type
    // (strictNullChecks)
    if (baseLang && languages.has(baseLanguage)) {
        Object.assign(messages, JSON.parse(await readFile(new URL(`${baseLang}.json`, translationsDir), 'utf8')));
    }
    if (languages.has(lang)) {
        Object.assign(messages, Object.fromEntries(Object.entries(JSON.parse(await readFile(new URL(`${lang}.json`, translationsDir), 'utf8'))).filter(([, value]) => Boolean(value))));
    }
    // Fall back to reading the default locale’s messages if no core messages were found.
    if (!languages.has(lang) && (!baseLang || !languages.has(baseLang))) {
        Object.assign(messages, JSON.parse(await readFile(new URL(`${defaultLocale}.json`, translationsDir), 'utf8')));
    }
    return messages;
}
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