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Universal Language Detector

Language detector that works universally (browser + server)

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.


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Demo

Live demo with the Next.js example

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 featuring the Next.js framework


API

Extensive API documentation can be found in the source code documentation

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:

Example:

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)

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


License

MIT


This project was generated using https://github.com/UnlyEd/boilerplate-generator/tree/master/templates/typescript-OSS

Vulnerability disclosure

See our policy.


Contributors and maintainers

This project is being maintained by:


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