README.md
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# Universal Language Detector
> Language detector that works universally (browser + server)
>
> - On the server, will rely on "cookies > accept-language header"
> - On the browser, will rely on "cookies > navigator settings"
>
> Meant to be used with a universal framework, such as Next.js
Note that this lib helps resolving the **`language`** (`fr`, `en`, `es`, etc.), **not the locale** (`fr-FR`, `en-US`, etc.)
_It is not out of scope though, PR are welcome to support universal locale detection._
---
<!-- toc -->
* [Demo](#demo)
* [Getting started](#getting-started)
* [Examples](#examples)
* [API](#api)
+ [`universalLanguageDetect`](#universallanguagedetect)
* [Contributing](#contributing)
+ [Working locally](#working-locally)
+ [Test](#test)
+ [Versions](#versions)
- [SemVer](#semver)
+ [Releasing and publishing](#releasing-and-publishing)
* [Changelog](#changelog)
* [License](#license)
- [Vulnerability disclosure](#vulnerability-disclosure)
- [Contributors and maintainers](#contributors-and-maintainers)
- [**[ABOUT UNLY]**](#about-unly-)
<!-- tocstop -->
---
## Demo
[Live demo with the Next.js example](https://universal-language-detector.now.sh/)
## Getting started
```
yarn install @unly/universal-language-detector
```
Use:
```
import universalLanguageDetect from '@unly/universal-language-detector';
OR
import { universalLanguageDetect } from '@unly/universal-language-detector';
```
## Examples
See [our example](./examples/with-next) featuring the Next.js framework
---
## API
> Extensive API documentation can be found in the [source code documentation](./src/index.ts)
>
> Only the most useful API methods are documented here, the other aren't meant to be used, even though they may be
### `universalLanguageDetect`
> Detects the language used, universally.
**Parameters:**
- `supportedLanguages`: string[];
- `fallbackLanguage`: string;
- `acceptLanguageHeader?`: string | undefined;
- `serverCookies?`: object | undefined;
- `errorHandler?`: [ErrorHandler](./src/utils/error.ts) | undefined;
**Example:**
```js
const lang = universalLanguageDetect({
supportedLanguages: SUPPORTED_LANGUAGES, // Whitelist of supported languages, will be used to filter out languages that aren't supported
fallbackLanguage: FALLBACK_LANG, // Fallback language in case the user's language cannot be resolved
acceptLanguageHeader: get(req, 'headers.accept-language'), // Optional - Accept-language header will be used when resolving the language on the server side
serverCookies: cookies, // Optional - Cookie "i18next" takes precedence over navigator configuration (ex: "i18next: fr"), will only be used on the server side
errorHandler: (error) => { // Optional - Use you own logger here, Sentry, etc.
console.log('Custom error handler:');
console.error(error);
},
});
```
---
## Contributing
We gladly accept PRs, but please open an issue first so we can discuss it beforehand.
### Working locally
```
yarn start # Shortcut - Runs linter + build + tests in concurrent mode (watch mode)
OR run each process separately for finer control
yarn lint
yarn build
yarn test
```
### Test
```
yarn test # Run all tests, interactive and watch mode
yarn test:once
yarn test:coverage
```
### Versions
#### SemVer
We use Semantic Versioning for this project: https://semver.org/. (`vMAJOR.MINOR.PATCH`: `v1.0.1`)
- Major version: Must be changed when Breaking Changes are made (public API isn't backward compatible).
- A function has been renamed/removed from the public API
- Something has changed that will cause the app to behave differently with the same configuration
- Minor version: Must be changed when a new feature is added or updated (without breaking change nor behavioral change)
- Patch version: Must be changed when any change is made that isn't either Major nor Minor. (Misc, doc, etc.)
### Releasing and publishing
```
yarn releaseAndPublish # Shortcut - Will prompt for bump version, commit, create git tag, push commit/tag and publish to NPM
yarn release # Will prompt for bump version, commit, create git tag, push commit/tag
npm publish # Will publish to NPM
```
> Don't forget we are using SemVer, please follow our SemVer rules.
**Pro hint**: use `beta` tag if you're in a work-in-progress (or unsure) to avoid releasing WIP versions that looks legit
---
## Changelog
> Our API change (including breaking changes and "how to migrate") are documented in the Changelog.
See [changelog](./CHANGELOG.md)
---
## License
MIT
---
> This project was generated using https://github.com/UnlyEd/boilerplate-generator/tree/master/templates/typescript-OSS
# Vulnerability disclosure
[See our policy](https://github.com/UnlyEd/Unly).
---
# Contributors and maintainers
This project is being maintained by:
- [Unly] Ambroise Dhenain ([Vadorequest](https://github.com/vadorequest)) **(active)**
---
# **[ABOUT UNLY]** <a href="https://unly.org"><img src="https://storage.googleapis.com/unly/images/ICON_UNLY.png" height="40" align="right" alt="Unly logo" title="Unly logo" /></a>
> [Unly](https://unly.org) is a socially responsible company, fighting inequality and facilitating access to higher education.
> Unly is committed to making education more inclusive, through responsible funding for students.
We provide technological solutions to help students find the necessary funding for their studies.
We proudly participate in many TechForGood initiatives. To support and learn more about our actions to make education accessible, visit :
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