### Register All Locales and Initialize svelte-intl-precompile in SvelteKit Layout

Source: https://github.com/cibernox/svelte-intl-precompile/blob/main/README.md

This HTML/JavaScript example demonstrates an alternative approach for initializing `svelte-intl-precompile` in a SvelteKit `__layout.svelte` file. It uses `registerAll()` to automatically register all locale files found in the `$locales` directory. The `init` function is then called with a fallback and the initial locale, similar to the previous example, followed by `waitLocale`.

```html
<!-- __layout.svelte -->
<script context="module">
  import { register, init, waitLocale, getLocaleFromNavigator } from 'svelte-intl-precompile';
  import { registerAll } from '$locales';

  // Equivalent to a `register("lang", () => import('$locales/lang'))` fro each lang file in localesRoot.
  registerAll();

  export async function load({session}) {
    init({
      fallbackLocale: 'en',
      initialLocale: session.acceptedLanguage || getLocaleFromNavigator(),
    });
    await waitLocale(); // awaits for initialLocale language pack to finish loading;
    return {};
  }
</script>
```

--------------------------------

### Configure Server-Side Rendering (SSR)

Source: https://context7.com/cibernox/svelte-intl-precompile/llms.txt

Setup for SvelteKit applications to extract locale from request headers and initialize the library during the server-side load phase.

```javascript
export function getSession(request) {
  const acceptedLanguage = request.headers["accept-language"]?.split(',')[0];
  return { acceptedLanguage };
}
```

```svelte
<script context="module">
  import { register, init, waitLocale, getLocaleFromNavigator } from 'svelte-intl-precompile';

  register('en', () => import('$locales/en'));

  export async function load({ session }) {
    init({
      fallbackLocale: 'en',
      initialLocale: session.acceptedLanguage || getLocaleFromNavigator(),
    });
    await waitLocale();
    return {};
  }
</script>
```

--------------------------------

### Initialize Locales in Layout

Source: https://github.com/cibernox/svelte-intl-precompile/blob/main/README.md

Register translation messages and initialize the library within your root layout file. This setup supports both static imports and lazy loading of locale files.

```html
<script>
  import { addMessages, init, getLocaleFromNavigator } from 'svelte-intl-precompile';
  import en from '$locales/en.js';
  import es from '$locales/es.js';

  addMessages('en', en);
  addMessages('es', es);

  init({
    fallbackLocale: 'en',
    initialLocale: getLocaleFromNavigator()
  });
</script>

<slot />
```

--------------------------------

### Initialize Translations with addMessages in Svelte

Source: https://context7.com/cibernox/svelte-intl-precompile/llms.txt

Registers translation dictionaries for specific locales using the `addMessages` function in a Svelte component. Translations can be loaded eagerly (bundled with your app) or lazily. This example shows eager loading and initialization with a fallback locale and the navigator's detected locale.

```svelte
<!-- src/routes/+layout.svelte -->
<script>
  import { addMessages, init, getLocaleFromNavigator } from 'svelte-intl-precompile';
  import en from '$locales/en.js';
  import es from '$locales/es.js';

  // Add translations eagerly (included in main bundle)
  addMessages('en', en);
  addMessages('es', es);

  // Initialize with fallback and detected locale
  init({
    fallbackLocale: 'en',
    initialLocale: getLocaleFromNavigator()
  });
</script>

<slot />

```

--------------------------------

### Manage Application Locales

Source: https://context7.com/cibernox/svelte-intl-precompile/llms.txt

Functions and stores to handle locale switching, detection, and asynchronous loading of locale data. Includes support for reactive locale tracking.

```svelte
<script>
  import { locale, locales, waitLocale, getLocaleFromNavigator } from 'svelte-intl-precompile';

  async function switchLocale(newLocale) {
    locale.set(newLocale);
    await waitLocale();
  }
</script>

<select bind:value={$locale}>
  {#each $locales as loc}
    <option value={loc}>{loc}</option>
  {/each}
</select>
```

--------------------------------

### Initialize svelte-intl-precompile with SSR Locale in SvelteKit Layout

Source: https://github.com/cibernox/svelte-intl-precompile/blob/main/README.md

This HTML/JavaScript code shows how to initialize `svelte-intl-precompile` in a SvelteKit `__layout.svelte` file. It registers individual locales, then calls `init` with a fallback locale and the initial locale derived from the session (captured from the SSR request) or browser navigator. `waitLocale` ensures the initial language pack is loaded before rendering.

```html
<!-- __layout.svelte -->
<script context="module">
  import { register, init, waitLocale, getLocaleFromNavigator } from 'svelte-intl-precompile';
  register('en', () => import('$locales/en-us'));
  register('en-US', () => import('$locales/en-US'));
  register('es-GB', () => import('$locales/es-GB'));	
	
  export async function load({session}) {
    init({
      fallbackLocale: 'en',
      initialLocale: session.acceptedLanguage || getLocaleFromNavigator(),
    });
    await waitLocale(); // awaits for initialLocale language pack to finish loading;
    return {};
  }
</script>
```

--------------------------------

### Configure SvelteKit Vite Plugin

Source: https://github.com/cibernox/svelte-intl-precompile/blob/main/README.md

Integrate the precompileIntl plugin into your svelte.config.js to enable automatic translation precompilation during the build process.

```javascript
import precompileIntl from "svelte-intl-precompile/sveltekit-plugin";

/** @type {import('@sveltejs/kit').Config} */
module.exports = {
  kit: {
    target: '#svelte',
    vite: {
      plugins: [
        precompileIntl('locales')
      ]
    }
  }
};
```

--------------------------------

### Configure SvelteKit Plugin for svelte-intl-precompile

Source: https://context7.com/cibernox/svelte-intl-precompile/llms.txt

Configures the Vite plugin for svelte-intl-precompile in your svelte.config.js. This plugin handles the build-time compilation of translation files. It accepts the path to your locales directory and optional configuration for prefix, file exclusions, and custom transformers.

```javascript
// svelte.config.js
import precompileIntl from "svelte-intl-precompile/sveltekit-plugin";

/** @type {import('@sveltejs/kit').Config} */
export default {
  kit: {
    vite: {
      plugins: [
        // Basic usage - translations in /locales folder
        precompileIntl('locales'),

        // With custom import prefix
        precompileIntl('locales', '$messages'),

        // With full options
        precompileIntl('locales', {
          prefix: '$locales',
          exclude: /^_/, // Exclude files starting with underscore
          transformers: {
            '.custom': (content, { filename }) => `export default ${content}`
          }
        })
      ]
    }
  }
};

```

--------------------------------

### Format Dates, Times, and Numbers

Source: https://context7.com/cibernox/svelte-intl-precompile/llms.txt

Reactive stores for formatting dates, times, and numbers that automatically update when the application locale changes. These stores accept standard Intl formatting options.

```svelte
<script>
  import { date, time, number } from 'svelte-intl-precompile';
  let now = new Date();
  let price = 1234.56;
</script>

<p>Today: {$date(now)}</p>
<p>Time: {$time(now, { timeStyle: 'medium' })}</p>
<p>Price: {$number(price, { style: 'currency', currency: 'USD' })}</p>
```

--------------------------------

### Auto-Register All Locales with registerAll in Svelte

Source: https://context7.com/cibernox/svelte-intl-precompile/llms.txt

Automatically registers all locale files found in the locales directory using `registerAll()` from the `$locales` virtual module. It also provides an `availableLocales` array listing all discovered locales. The `load` function initializes translations and waits for the locale to be ready.

```svelte
<script context="module">
  import { init, waitLocale, getLocaleFromNavigator } from 'svelte-intl-precompile';
  import { registerAll, availableLocales } from '$locales';

  // Register all locales at once (lazy loading)
  registerAll();

  // availableLocales = ["en", "es", "fr", "de", "en-US", ...]
  console.log('Available languages:', availableLocales);

  export async function load({ session }) {
    init({
      fallbackLocale: 'en',
      initialLocale: session.acceptedLanguage || getLocaleFromNavigator(),
    });
    await waitLocale();
    return {};
  }
</script>

```

--------------------------------

### ICU Translation Configuration and Compilation

Source: https://github.com/cibernox/svelte-intl-precompile/blob/main/README.md

Demonstrates the transformation of raw ICU message syntax into optimized JavaScript functions using the library's babel plugin. The input JSON defines various translation types, while the output code shows the generated functions that leverage small utility helpers for performance.

```json
{
  "plain": "Some text without interpolations",
  "interpolated": "A text where I interpolate {count} times",
  "time": "Now is {now, time}",
  "number": "My favorite number is {n, number}",
  "pluralized": "I have {count, plural,=0 {no cats} =1 {one cat} other {{count} cats}}",
  "pluralized-with-hash": "I have {count, plural, zero {no cats} one {just # cat} other {# cats}}",
  "selected": "{gender, select, male {He is a good boy} female {She is a good girl} other {They are good fellas}}",
  "numberSkeleton": "Your account balance is {n, number, ::currency/CAD sign-always}",
  "installProgress": "{progress, number, ::percent scale/100 .##} completed"
}
```

```javascript
import { __interpolate, __number, __plural, __select, __time } from "precompile-intl-runtime";
export default {
  plain: "Some text without interpolations",
  interpolated: count => `A text where I interpolate ${__interpolate(count)} times`,
  time: now => `Now is ${__time(now)}`,
  number: n => `My favorite number is ${__number(n)}`,
  pluralized: count => `I have ${__plural(count, { 0: "no cats", 1: "one cat", h: `${__interpolate(count)} cats`})}`,
  "pluralized-with-hash": count => `I have ${__plural(count, { z: "no cats", o: `just ${count} cat`, h: `${count} cats`})}`,
  selected: gender => __select(gender, { male: "He is a good boy", female: "She is a good girl", other: "They are good fellas"}),
  numberSkeleton: n => `Your account balance is ${__number(n, { style: 'currency', currency: 'CAD', signDisplay: 'always' })}`,
  installProgress: progress => `${__number(progress / 100, { style: 'percent', maximumFractionDigits: 2 })} completed`
}
```

--------------------------------

### Access Translations with $t Store

Source: https://context7.com/cibernox/svelte-intl-precompile/llms.txt

The $t store is the primary interface for rendering localized strings. It supports simple text, variable interpolation, pluralization, select statements, and number formatting using ICU message syntax.

```svelte
<script>
  import { t } from 'svelte-intl-precompile';
</script>

<h1>{$t('welcome')}</h1>
<p>{$t('greeting', { name: 'World' })}</p>
<p>{$t('items', { count: 5 })}</p>
<p>{$t('pronoun', { gender: 'female' })}</p>
<p>{$t('price', { amount: 1234.56 })}</p>
```

--------------------------------

### Translate Content in Svelte Components

Source: https://github.com/cibernox/svelte-intl-precompile/blob/main/README.md

Use the 't' store provided by the library to translate keys within your Svelte components. The store automatically updates when the locale changes.

```html
<script>
	import { t } from 'svelte-intl-precompile'
</script>
<footer>
	<p>{$t("hightide")} {$t("footer.cta")}</p>
</footer>
```

--------------------------------

### Define Translation Files

Source: https://context7.com/cibernox/svelte-intl-precompile/llms.txt

Translations can be defined in various formats including JSON, YAML, and JavaScript. The library automatically transforms ICU message syntax into optimized functions.

```json
{
  "plain": "Some text",
  "pluralized": "I have {count, plural, one {one cat} other {# cats}}"
}
```

```yaml
plain: "Texto sin interpolaciones"
pluralized: "Tengo {count, plural, one {un gato} other {{count} gatos}}"
```

```javascript
export default {
  plain: "Du texte",
  pluralized: "J'ai {count, plural, one {un chat} other {# chats}}"
};
```

--------------------------------

### Define Translation JSON

Source: https://github.com/cibernox/svelte-intl-precompile/blob/main/README.md

Create translation files in JSON format to store key-value pairs for different locales. These files are used by the library to resolve localized strings.

```json
{
  "recent.aria": "Find recently viewed tides",
  "menu": "Menu",
  "foot": "{count} {count, plural, =1 {foot} other {feet}}"
}
```

--------------------------------

### Extract Accept-Language Header in SvelteKit Hooks

Source: https://github.com/cibernox/svelte-intl-precompile/blob/main/README.md

This JavaScript code snippet demonstrates how to extract the 'accept-language' HTTP header from an incoming request within SvelteKit's `getSession` hook. It prioritizes the first language listed in the header and returns it as part of the session object, making it available for SSR locale initialization.

```javascript
// src/hooks.js
export function getSession(request) {
  let acceptedLanguage = request.headers["accept-language"] && request.headers["accept-language"].split(',')[0];
  return { acceptedLanguage };
}
```

--------------------------------

### Lazy Load Translations with register in Svelte

Source: https://context7.com/cibernox/svelte-intl-precompile/llms.txt

Enables lazy loading of translation files using the `register` function in Svelte. This approach loads translations only when needed, which is beneficial for applications with many languages to avoid bundling all translations upfront. The `load` function initializes translations and waits for the locale to be ready.

```svelte
<script context="module">
  import { register, init, waitLocale, getLocaleFromNavigator } from 'svelte-intl-precompile';

  // Register locales for lazy loading
  register('en', () => import('$locales/en'));
  register('es', () => import('$locales/es'));
  register('fr', () => import('$locales/fr'));
  register('de', () => import('$locales/de'));

  export async function load({ session }) {
    init({
      fallbackLocale: 'en',
      initialLocale: session.acceptedLanguage || getLocaleFromNavigator(),
    });

    // Wait for the initial locale to load before rendering
    await waitLocale();
    return {};
  }
</script>

```

--------------------------------

### Transform ICU Messages with transformCode (JavaScript)

Source: https://context7.com/cibernox/svelte-intl-precompile/llms.txt

The transformCode function programmatically converts ICU message syntax into optimized JavaScript. This is useful for custom tooling and interactive playgrounds. It takes the ICU message string and an optional configuration object, returning the transformed code.

```javascript
import svelteIntlPrecompile from "svelte-intl-precompile/sveltekit-plugin";

const { transformCode } = svelteIntlPrecompile;

// Transform ICU messages to optimized JavaScript
const input = `export default {
  "greeting": "Hello, {name}!",
  "items": "{count, plural, =0 {No items} one {# item} other {# items}}"
}`;

const output = transformCode(input, { filename: 'en.js' });
// Output:
// import { __interpolate, __plural } from "svelte-intl-precompile";
// export default {
//   "greeting": name => `Hello, ${__interpolate(name)}!`,
//   "items": count => `${__plural(count, { 0: "No items", o: `${count} item`, h: `${count} items`})}`
// };
```

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