@appsemble/node-utils/getAppsembleMessages.js

NodeJS utilities used by Appsemble internally.

import { readdir, readFile } from 'node:fs/promises';
import { defaultLocale, normalizeLocale } from '@appsemble/utils';
import { AppsembleError } from './AppsembleError.js';
const translationsDir = new URL('../../i18n/', import.meta.url);
async function getLanguageFiles() {
    const files = await readdir(translationsDir);
    const result = new Map();
    for (const file of files) {
        if (!file.endsWith('.json')) {
            continue;
        }
        const language = normalizeLocale(file.slice(0, -'.json'.length));
        if (result.has(language)) {
            throw new AppsembleError(`Found duplicate language codes: ‘${language}’`);
        }
        result.set(language, file);
    }
    return result;
}
export async function getSupportedLanguages() {
    return new Set((await getLanguageFiles()).keys());
}
/**
 * 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 = normalizeLocale(language);
    const baseLang = baseLanguage ? normalizeLocale(baseLanguage) : undefined;
    const languages = await getLanguageFiles();
    const messages = {};
    if (baseLang && languages.has(baseLang)) {
        Object.assign(messages, JSON.parse(await readFile(new URL(languages.get(baseLang), translationsDir), 'utf8')));
    }
    if (languages.has(lang)) {
        Object.assign(messages, Object.fromEntries(Object.entries(JSON.parse(await readFile(new URL(languages.get(lang), translationsDir), 'utf8'))).filter(([, value]) => Boolean(value))));
    }
    if (!languages.has(lang) && (!baseLang || !languages.has(baseLang))) {
        const defaultLanguage = normalizeLocale(defaultLocale);
        Object.assign(messages, JSON.parse(await readFile(new URL(languages.get(defaultLanguage), translationsDir), 'utf8')));
    }
    return messages;
}
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