Michelle
4a4ec0a3a3
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53 lines
1.5 KiB
JavaScript
53 lines
1.5 KiB
JavaScript
import { createRequire } from 'module';
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import { fileURLToPath } from 'url';
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import path from 'path';
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const __filename = fileURLToPath(import.meta.url);
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const __dirname = path.dirname(__filename);
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const require = createRequire(import.meta.url);
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const cache = {};
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function load(lang) {
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if (cache[lang]) return cache[lang];
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try {
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cache[lang] = require(path.resolve(__dirname, '../i18n', `${lang}.json`));
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return cache[lang];
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} catch {
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if (lang !== 'en') return load('en');
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cache[lang] = {};
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return cache[lang];
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}
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}
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/**
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* Translate a dot-separated key for the given language.
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* Interpolates {placeholder} tokens from params.
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* Unresolved tokens are left as-is so callers can do HTML substitution afterwards.
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*
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* @param {string} lang Language code, e.g. 'en', 'de'
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* @param {string} keyPath Dot-separated key, e.g. 'email.verify.subject'
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* @param {Record<string,string>} [params] Values to interpolate
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* @returns {string}
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*/
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export function t(lang, keyPath, params = {}) {
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const keys = keyPath.split('.');
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function resolve(dict) {
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let val = dict;
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for (const k of keys) {
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val = val?.[k];
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}
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return typeof val === 'string' ? val : undefined;
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}
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let value = resolve(load(lang));
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// Fallback to English
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if (value === undefined) value = resolve(load('en'));
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if (value === undefined) return keyPath;
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return value.replace(/\{(\w+)\}/g, (match, k) =>
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params[k] !== undefined ? String(params[k]) : match
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);
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}
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