How to use `@intlify/core` in NodeJS

[Evgeny]

Clear and concise description of the problem

Could you please add code samples and/or documentation how to use @intlify/core in bare NodeJS app.

Suggested solution

Code samples or documentation or tests in the repo https://github.com/intlify/vue-i18n-next/tree/master/packages/core

Alternative

No response

Additional context

It would be helpful to use the same i18n system in vue app and server side code.

Validations

• Read the Contributing Guidelines
• Read the Documentation
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

[kazuya kawaguchi]

Thank you for your feedback!

We are planning to migrate @intlify/core from vue-i18n-next to a separate package to make it completely framework-agnostic in the future. We will have it documented at that time.

There is no documentation, but here are some real world packages where @intlify/core is used. It may be of interest to you.

• @intlify/cli: https://github.com/intlify/cli/blob/main/src/i18n.ts
• @intlify/h3: https://github.com/intlify/h3/blob/main/src/index.ts

[Evgeny]

My example code of using @intlify/core in Telegram bot:

// i18n.js
import {
  createCoreContext,
  number,
  translate,
} from '@intlify/core';

import datetimeFormats from './datetimeFormats.js';
import numberFormats from './numberFormats.js';
import pluralRules from './pluralRules.js';

const messages = {};
// load messages

const contexts = new Map();

export function i18n(locale) {
  if (!contexts.has(locale)) {
    contexts.set(locale, createCoreContext({
      locale: locale,
      messages,
      datetimeFormats,
      numberFormats,
      pluralRules,
    }));
  }
  const i18nContext = contexts.get(locale);
  return {
    t(key, ...args) {
      return translate(i18nContext, key, ...args);
    },
    n(value, ...args) {
      return number(i18nContext, value, ...args);
    },
  };
}

Usage:

bot.use(async (ctx, next) => {
  // make t and n available on context
  Object.assign(ctx, i18n(ctx.user.locale));
  return next();
});

This allow me to share almost all translation logic between vue app and server side bot related code.