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@polyglot-hub/nest-sdk

v0.1.1

Published

polyglot-hub.io для NestJS: PolyglotModule, PolyglotService и контроллер переводов для фронтенда

Readme

@polyglot-hub/nest-sdk

polyglot-hub.io для NestJS: модуль, сервис для кода бэкенда и контроллер, через который фронтенд получает переводы без service key. Работает на Express и Fastify. Обёртка над @polyglot-hub/sdk.

npm i @polyglot-hub/nest-sdk

Подключение

  1. Ключи приложения. В polyglot-hub.io откройте приложение: appId — в адресе (/apps/<appId>/…) и на вкладке «Подключение», serviceKey — в «Настройках». Положите их в окружение бэкенда:

    POLYGLOT_APP_ID=…
    POLYGLOT_SERVICE_KEY=… # секрет: не коммитить и не отдавать в браузер
  2. Модуль — в корневом модуле приложения:

    import {Module} from '@nestjs/common';
    import {ConfigModule, ConfigService} from '@nestjs/config';
    import {PolyglotModule} from '@polyglot-hub/nest-sdk';
    
    @Module({
      imports: [
        ConfigModule.forRoot({isGlobal: true}),
        PolyglotModule.forRootAsync({
          inject: [ConfigService],
          useFactory: (config: ConfigService) => ({
            appId: config.getOrThrow('POLYGLOT_APP_ID'),
            serviceKey: config.getOrThrow('POLYGLOT_SERVICE_KEY'),
            ttl: 60_000, // кеш ответов polyglot-hub в памяти, мс; 0 — без кеша
          }),
          controllerPath: 'i18n', // GET /i18n/locales и GET /i18n/:locale для фронтенда; не задан — без контроллера
        }),
      ],
    })
    export class AppModule {}

    Без ConfigModule — PolyglotModule.forRoot({appId, serviceKey, controllerPath}). Модуль глобальный (isGlobal: false — чтобы импортировать явно). Глобальный префикс (app.setGlobalPrefix('api')) добавляется к пути: /api/i18n/….

  3. Фронтенд — @polyglot-hub/sdk с адресом контроллера:

    import {createPolyglot} from '@polyglot-hub/sdk';
    
    export const polyglot = createPolyglot({endpoint: 'https://api.my-app.com/i18n'});
    await polyglot.init(); // запомненный язык → язык браузера → первый язык приложения
    
    polyglot.locales; // [{iso: 'ru', title: 'Русский'}, …] — для переключателя
    polyglot.getLang('cart.title');

    Фронтенд на другом домене — разрешите его в app.enableCors({origin: […]}). React, хранение выбранного языка (storage) и остальное API клиента — в README @polyglot-hub/sdk.

  4. Проверка:

    curl http://localhost:3000/i18n/locales # [{"iso":"ru","title":"Русский"}, …]
    curl http://localhost:3000/i18n/ru      # {"cart.title":"Корзина", …}

В коде бэкенда

import {Injectable} from '@nestjs/common';
import {PolyglotService} from '@polyglot-hub/nest-sdk';

@Injectable()
export class MailService {
  constructor(private readonly polyglot: PolyglotService) {}

  async orderSubject(locale: string, count: number) {
    const t = await this.polyglot.getTranslator(locale);
    return t.getPluralLang('mail.order.items', count); // «5 товаров»
  }
}

PolyglotService: getTranslations(locale), getLocales(), getTranslator(locale), clearCache().

Если polyglot-hub недоступен, отдаётся последний удачный ответ из кеша; иначе — 502 без деталей.