core VS i18next

Some libraries support ways to handle missing translations (e.g., TranslocoMissingHandler from Transloco or MissingTranslationHandler   from ngx-translate). So that's a way to find out any missing translations, but that's quite manual because you have to go over every part of the served application.

ngx-translate

It was rather painless. We are using ngx-translate which seems dead at this point but works fine in 16 (seems to have gotten a recent commit).

The problem with Angular 15 was the Ivy engine. And it wasn't fixed, maybe you're not affected. https://github.com/ngx-translate/core/issues/1185

He talks about it more here: https://github.com/ngx-translate/core/issues/783

Ngx-translate is not updated anymore. Latest version is a year old. It's still not abandoned but it seems like the developer moved on to work on Angular i18n.

Just to refer to the original docs: https://github.com/ngx-translate/core

One of the common pitfalls when using i18n are large translation files size and inability to split them in order to hide parts of your application from prying eyes. Some solutions like Angular built-in implementation are really powerful and SEO compatible but require a lot of preparation and do not support switching languages on the fly in development mode (which was causing troubles at least in version 9); other solutions like ngx-translate require you to install several packages and still don’t support splitting up a single language.

For this article, we'll leverage the 'Simple CRM' project from our previous list of projects. We'll integrate and utilize the i18n library to internationalize our application.

When starting a new project with Next.js these days, next-intl and zod are my go to libraries for internationalization and schema validation, respectively. Of course, when using zod for client-facing validations I would like to translate potential error messages. The package zod-i18n can be used to achieve this for i18next, a popular alternative internationalization library. This means that by using this library as starting point one can quickly achieve zod translation with next-intl.

The best way to implement internationalization is to use an internationalization framework library, such as i18next. With this kind of library, you can easily handle translations and automatically display your frontend labels in the user's language. The frontend application also needs to be flexible and easily configurable so that its layout can change accordingly, reading from left to right or right to left. CSS allows this with the rtl and ltr CSS direction property.

For reference, I am using i18next for providing translations, which is configured to use the english message string as a key for the translations and fallback to it if no translation is found in the chosen language. I also use the official svelte-i18next integration. It wraps the i18next object in a Svelte store and, among other things, provides reactivity when the language is changed.

// app/components/BuiltInFormatsDemo.tsx 'use client'; import React from 'react'; import {useTranslation} from '../i18n/client'; import type {LocaleTypes} from '../i18n/settings'; import {useParams} from 'next/navigation'; const BuiltInFormatsDemo = () => { let locale = useParams()?.locale as LocaleTypes; const {t} = useTranslation(locale, 'built-in-demo'); return (

{/* "number": "Number: {{val, number}}", */} {t('number', { val: 123456789.0123, })} p>

{/* "currency": "Currency: {{val, currency}}", */} {t('currency', { val: 123456789.0123, style: 'currency', currency: 'USD', })} p>

{/* "dateTime": "Date/Time: {{val, datetime}}", */} {t('dateTime', { val: new Date(1234567890123), formatParams: { val: { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric', }, }, })} p>

{/* "relativeTime": "Relative Time: {{val, relativetime}}", */} {t('relativeTime', { val: 12, style: 'long', })} p>

{/* "list": "List: {{val, list}}", */} {t('list', { // https://www.i18next.com/translation-function/objects-and-arrays#objects // Check the link for more details on `returnObjects` val: t('weekdays', {returnObjects: true}), })} p> div> ); }; export default BuiltInFormatsDemo;

As our world becomes increasingly interconnected, the development of web applications that cater to a global audience takes precedence among developers. If you're a TypeScript developer, you're likely acquainted with the advantages of static typing and the assurance it provides in your codebase. When it comes to internationalization (i18n) and localization (l10n), maintaining the same level of type safety becomes crucial. This is precisely where i18next, an influential i18n framework, enters the picture.

check i18next

In this article, we will go over how to perform internationalisation in our react app using the i18next framework. I18next is an internationalisation framework written in JavaScript. It comes with everything you need to localise your web, desktop or mobile product such as user language detection, loading and caching translations, and file conversion etc More features can be found in their documentation. (https://www.i18next.com/)

Luckily this is a well-solved problem: https://www.i18next.com/

I am so sorry for all the people using https://www.i18next.com/ and manually defining string ids. Fuck that. I will never write another message id in my life.