### Installation and Running sveltekit-i18n Examples

Source: https://github.com/sveltekit-i18n/lib/blob/master/examples/README.md

Instructions on how to set up and run the sveltekit-i18n examples. This involves cloning the repository, installing dependencies, and starting the development server.

```bash
git clone <repository-url> # or download the project
cd ./your/example/destination/
npm i sveltekit-i18n@latest
npm run dev -- --open
```

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

### Setup and Run Demo

Source: https://github.com/sveltekit-i18n/lib/blob/master/examples/parser-icu/README.md

Follow these steps to download the example, install dependencies, and start the development server for the @sveltekit-i18n/parser-icu demo.

```shell
cd ./parser-icu/
npm i
npm run dev -- --open
```

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

### sveltekit-i18n Configuration Options

Source: https://github.com/sveltekit-i18n/lib/blob/master/examples/README.md

Demonstrates key configuration options for sveltekit-i18n, including loaders for translation files and preprocess directives for managing translation loading and compilation.

```APIDOC
sveltekit-i18n Configuration:

Configuration object for sveltekit-i18n.

Properties:
  - loaders: Array of loader objects. Each loader specifies a locale and a path to its translation data.
    Example: [
      { "locale": "en", "key": "common", "loader": async () => (await import("./en/common.json")).default },
      { "locale": "en", "key": "home", "loader": async () => (await import("./en/home.json")).default },
      { "locale": "de", "key": "common", "loader": async () => (await import("./de/common.json")).default },
      { "locale": "de", "key": "home", "loader": async () => (await import("./de/home.json")).default }
    ]
  - preprocess: Array of preprocess objects. These are used to process translation files before they are loaded.
    Example: [
      { "pattern": "*.{json,json5}", "preprocessor": "parser-default" },
      { "pattern": "*.{json,json5}", "preprocessor": "parser-icu" }
    ]
  - fallbackLocale: Specifies the fallback locale to use when a translation is not found in the current locale.
    Example: "en"
```

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

### Parser Integration Examples

Source: https://github.com/sveltekit-i18n/lib/blob/master/examples/README.md

Examples showcasing the integration of different parsers with sveltekit-i18n. This includes the default parser and the ICU parser, demonstrating how to handle various translation syntaxes.

```APIDOC
sveltekit-i18n Parsers:

Parsers are used to process translation files, enabling different syntax features.

1. Default Parser:
   - Used for standard JSON translation files.
   - Configuration: `preprocess: [{ "pattern": "*.{json,json5}", "preprocessor": "parser-default" }]`
   - Example Usage: Loads JSON files directly.

2. ICU Parser:
   - Used for translations following the ICU message syntax, supporting complex formatting like plurals and genders.
   - Configuration: `preprocess: [{ "pattern": "*.{json,json5}", "preprocessor": "parser-icu" }]`
   - Example Usage: Handles messages like `items_count: {count, plural, =0 {no items} =1 {one item} other {# items}}`
```

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

### Setup sveltekit-i18n Translations Configuration (JavaScript)

Source: https://github.com/sveltekit-i18n/lib/blob/master/README.md

Configures the sveltekit-i18n library with locale definitions, keys, and loaders. It specifies how translations are loaded for different locales and routes, enabling dynamic translation management.

```javascript
import i18n from 'sveltekit-i18n';

/** @type {import('sveltekit-i18n').Config} */
const config = ({
  loaders: [
    {
      locale: 'en',
      key: 'common',
      loader: async () => (
        await import('./en/common.json')
      ).default,
    },
    {
      locale: 'en',
      key: 'home',
      routes: ['/'], // you can use regexes as well!
      loader: async () => (
        await import('./en/home.json')
      ).default,
    },
    {
      locale: 'en',
      key: 'about',
      routes: ['/about'],
      loader: async () => (
        await import('./en/about.json')
      ).default,
    },
    {
      locale: 'cs',
      key: 'common',
      loader: async () => (
        await import('./cs/common.json')
      ).default,
    },
    {
      locale: 'cs',
      key: 'home',
      routes: ['/'],
      loader: async () => (
        await import('./cs/home.json')
      ).default,
    },
    {
      locale: 'cs',
      key: 'about',
      routes: ['/about'],
      loader: async () => (
        await import('./cs/about.json')
      ).default,
    },
  ],
});

export const { t, locale, locales, loading, loadTranslations } = new i18n(config);
```

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

### SvelteKit Custom Parameter Matcher for Locale

Source: https://github.com/sveltekit-i18n/lib/blob/master/examples/locale-router-advanced/README.md

The `locale.js` parameter matcher in `src/params/` defines how the `[...lang=locale]` route parameter is handled. It allows routing for pages starting with a locale prefix or the default language index.

```javascript
/** @type {import('@sveltejs/kit').ParamMatcher} */
export function locale(param) {
  // Matches 'en', 'de', 'cs' or the root path for default language
  return /^(en|de|cs)$/.test(param) || param === '';
}
```

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

### sveltekit-i18n Configuration Options

Source: https://github.com/sveltekit-i18n/lib/blob/master/docs/README.md

Defines the various configuration properties for the sveltekit-i18n library. This includes settings for translations, asynchronous loading of translation data, preprocessing steps, locale fallback mechanisms, caching behavior, logging levels and prefixes, and parser-specific options.

```APIDOC
Config:
  translations?: Translations.T
    This property defines translations, which should be in place before `loaders` will trigger. It's useful for synchronous translations (e.g. locally defined language names which are same for all language mutations).

  loaders?: Loader.LoaderModule[]
    You can use `loaders` to define your asyncronous translation load. All loaded data are stored so loader is triggered only once – in case there is no previous version of the translation. It can get refreshed according to `config.cache`.
    Each loader can include:
      locale: string – locale (e.g. `en`, `de`) which is this loader for.
      key: string – represents the translation namespace. This key is used as a translation prefix so it should be module-unique. You can access your translation later using `$t('key.yourTranslation')`. It shouldn't include `.` (dot) character.
      loader: () => Promise<Record<any, any>> – is a function returning a `Promise` with translation data. You can use it to load files locally, fetch it from your API etc...
      routes?: Array<string | RegExp> – can define routes this loader should be triggered for. You can use Regular expressions too. For example `[//.ome/]` will be triggered for `/home` and `/rome` route as well (but still only once). Leave this `undefined` in case you want to load this module with any route (useful for common translations).

  preprocess?: 'full' | 'preserveArrays' | 'none' | (input: Translations.Input) => any
    Defines a preprocess strategy or a custom preprocess function. Preprocessor runs immediately after the translation data load.
    Examples for input:
    ```json
    {"a": {"b": [{"c": {"d": 1}}, {"c": {"d": 2}}]}}
    ```
    `'full'` (default) setting will result in:
    ```json
    {"a.b.0.c.d": 1, "a.b.1.c.d": 2}
    ```
    `'preserveArrays'` in:
    ```json
    {"a.b": [{"c.d": 1}, {"c.d": 2}]}
    ```
    `'none'` (nothing's changed):
    ```json
    {"a": {"b": [{"c": {"d": 1}}, {"c": {"d": 2}}]}}
    ```
    Custom preprocess function `(input) => JSON.parse(JSON.stringify(input).replace('1', '"🦄"'))` will output:
    ```json
    {"a": {"b": [{"c": {"d": "🦄"}}, {"c": {"d": 2}}]}}
    ```

  initLocale?: string
    If you set this property, translations will be initialized immediately using this locale.

  fallbackLocale?: string
    If you set this property, translations are automatically loaded not for current `$locale` only, but for this locale as well. In case there is no translation for current `$locale`, fallback locale translation is used instead of translation key placeholder. This is also used as a fallback when unknown locale is set.
    Note that it's not recommended to use this property if you don't really need it. It may affect your data load.

  fallbackValue?: any
    By default, translation key is returned in case no translation is found for given translation key. For example, `$t('unknown.key')` will result in `'unknown.key'` output. You can set this output value using this config prop.

  cache?: number
    When you are serving your app, translations are loaded only once on server. This property allows you to setup a refresh period in milliseconds when your translations are refetched on the server. The default value is `86400000` (24 hours).
    Tip: You can set to `Number.POSITIVE_INFINITY` to disable server-side refreshing.

  log.level?: 'error' | 'warn' | 'debug'
    You can manage log level using this property (default: `'warn'`).

  log.prefix?: string
    You can prefix output logs using this property (default: `'[i18n]: '`).

  log.logger?: Logger.T
    You can setup your custom logger using this property (default: `console`).

  parserOptions?: Parser.Options
    This property includes configuration related to `@sveltekit-i18n/parser-default`.
    Read more about `parserOptions` [here](https://github.com/sveltekit-i18n/parsers/tree/master/parser-default#options).

```

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

### Apache .htaccess for Locale Routing and Error Handling

Source: https://github.com/sveltekit-i18n/lib/blob/master/examples/locale-router-static/README.md

Configuration for Apache web servers to handle locale-based URL routing and serve language-specific error pages. It redirects users to appropriate language subdirectories based on the Accept-Language header and sets custom error documents for each locale.

```apache-config
RewriteEngine On
RewriteBase /
# DirectorySlash Off

# Prevent dot directories (hidden directories like .git) to be exposed to the public
# Except for the .well-known directory used by LetsEncrypt a.o
# RewriteRule "/\.|^\.(?!well-known/)" - [F]

# Rewrite www.example.com -> example.com -- used with SEO Strict URLs plugin
# RewriteCond %{HTTP_HOST} .
# RewriteCond %{HTTP_HOST} ^www.(.*)$ [NC]
# RewriteRule ^(.*)$ https://%1/$1 [R=301,L]


# Rewrite secure requests properly to prevent SSL cert warnings, e.g. prevent 
# https://www.example.com when your cert only allows https://secure.example.com
# RewriteCond %{SERVER_PORT} !^443
# RewriteRule (.*) https://%{SERVER_NAME}/$1 [R=301,L]

# Remove trailing slashes
# NOTE: Use with `DirectorySlash Off`.
# RewriteCond %{REQUEST_FILENAME} !-f
# RewriteRule ^(.*[^/])$ /$1/ [L]

# Serve files if exist
RewriteCond %{REQUEST_FILENAME} -f
RewriteRule ^(.*)$ - [L]

##############################################
# Skip redirection if locale already present #
##############################################
RewriteRule ^cs(\/.*)?$ - [L]
RewriteRule ^de(\/.*)?$ - [L]
RewriteRule ^en(\/.*)?$ - [L]

##############################
# Set custom locales if fits #
##############################
RewriteCond %{HTTP:Accept-Language} ^cs [NC]
RewriteRule ^ /cs%{REQUEST_URI} [R=301,L]

RewriteCond %{HTTP:Accept-Language} ^de [NC]
RewriteRule ^ /de%{REQUEST_URI} [R=301,L]

###############################################
# Set default locale if no custom locale fits #
###############################################
RewriteRule ^ /en%{REQUEST_URI} [R=301,L]

######################################
# Set error pages for custom locales #
######################################
<If "%{REQUEST_URI} =~ /^\x2Fcs(\x2F.*)?$/">
  ErrorDocument 401 /cs/401/index.html
  ErrorDocument 403 /cs/403/index.html
  ErrorDocument 404 /cs/404/index.html
  ErrorDocument 500 /cs/500/index.html
</If>
<ElseIf "%{REQUEST_URI} =~ /^\x2Fde(\x2F.*)?$/">
  ErrorDocument 401 /de/401/index.html
  ErrorDocument 403 /de/403/index.html
  ErrorDocument 404 /de/404/index.html
  ErrorDocument 500 /de/500/index.html
</ElseIf>

##################################
# Set default locale error pages #
##################################
<Else>
  ErrorDocument 401 /en/401/index.html
  ErrorDocument 403 /en/403/index.html
  ErrorDocument 404 /en/404/index.html
  ErrorDocument 500 /en/500/index.html
</Else>
```

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

### SvelteKit Server Hook for Locale Redirection

Source: https://github.com/sveltekit-i18n/lib/blob/master/examples/locale-router-advanced/README.md

The `hooks.server.js` file manages server-side logic for locale routing. It handles redirects to the appropriate language mutation and fetches pages with the default language in the background, serving them without a lang prefix in the URL.

```javascript
/** @type {import('@sveltejs/kit').Handle} */
export async function handle({ event, resolve }) {
  const lang = event.url.pathname.split('/')[1];

  // If no language prefix is found, redirect to default language (e.g., '/en')
  if (!lang || !['en', 'de', 'cs'].includes(lang)) {
    return new Response('Redirecting to default language', {
      status: 307,
      headers: {
        'Location': `/en${event.url.pathname}`
      }
    });
  }

  // If language prefix is present and valid, proceed with the request
  const response = await resolve(event);
  return response;
}
```

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

### Load Translations in SvelteKit Layout (JavaScript)

Source: https://github.com/sveltekit-i18n/lib/blob/master/README.md

Loads translations for the current locale and path within a SvelteKit application's layout. This ensures translations are available before components render, typically based on the user's locale and the current URL.

```javascript
import { loadTranslations } from '$lib/translations';

/** @type {import('@sveltejs/kit').Load} */
export const load = async ({ url }) => {
  const { pathname } = url;

  const initLocale = 'en'; // get from cookie, user session, ...

  await loadTranslations(initLocale, pathname); // keep this just before the `return`

  return {};
}
```

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

### Use Translations in Svelte Components (Svelte)

Source: https://github.com/sveltekit-i18n/lib/blob/master/README.md

Integrates the translation function `t` from sveltekit-i18n into Svelte components. It allows displaying translated strings and using placeholders or modifiers defined in the translation files.

```svelte
<script>
  import { t } from '$lib/translations';

  const pageName = 'This page is Home page!';
</script>

<div>
  <!-- you can use `placeholders` and `modifiers` in your definitions (see docs) -->
  <h2>{$t('common.page', { pageName })}</h2>
  <p>{$t('home.content')}</p>
</div>
```

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