@deckweiss/internationalization

Getting started

This repository contains internationalization for SvelteKit.

Installation

1. Install package

pnpm i @deckweiss/internationalization

2. Initialize i18n

// src/i18n.ts
import { initialize as initializeI18n } from '@deckweiss/internationalization';
import de from '$lib/translations/de.json';
import en from '$lib/translations/en.json';

initializeI18n({
    defaultLocale: 'en',
    locales: {
        de,
        en
    }
});

// src/hooks.server.ts
import { handle } from '@deckweiss/internationalization';
import './i18n.js';

export { handle };

// hooks.client.ts
import './i18n.js';

3. Use translations

// +page.svelte
<script>
    import { t } from '@deckweiss/internationalization';
</script>


<p>{$t('app.day', { date: Date.now() })}</p>

4. (optional) Update selected locale

// src/lib/components/language-picker.svelte
<script>
    import { locale, locales, setLocale } from '@deckweiss/internationalization';
</script>


<select value={$locale} on:change={(event) => setLocale(event.target.value)}>
    <option disabled>Choose language</option>
    {#each locales as l}
        <option value={l} selected={l === $locale}>{l}</option>
    {/each}
</select>

JSON Format

This package is compatible with i18next JSON v4. Although, it currently does only support nested keys and interpolation with formatting.

Examples

// src/lib/translations/en.json
{
    "app": {
        "name": "Example app",
        "day": "Today is {{date, date(format: dddd)}}"
    }
}

Usage	Output
$t('app.name')	"Example app"
$t('app.day', { date: new Date(1997, 4, 22) })}	"Today is Thursday"

Date format symbols can be found here. Bundled date languages

• German
• English
• Italian
• Spanish

Supported Interpolations

Date and Time

// src/lib/translations/en.json
{
    "day": "Today is {{date, date(format: dddd, dd.mm.yyyy)}}" // Output: "Today is Friday, 23.05.1997"
}

Numbers and Currency

The options argument gets directly passed into the Intl.NumberFormat constructor. Hence, you can configure any option in JSON syntax.

// src/lib/translations/en.json
{
    "number": "{{count, number(options: {\"style\": \"decimal\", \"minimumFractionDigits\": 5})}}", // Output: "5,132.95000"
    "currency": "{{amount, number(options: {\"style\": \"currency\", \"currency\": \"EUR\"})}}" // Output: "5,132.95 €"
}

Contribution

Create a new release

1. Update package version either by hand or with pnpm version.
2. The commit message onto main must begin with chore: release