🌍 react-native-localize

A toolbox for your React Native app localization.

⚠️ Breaking change

This project was known as react-native-languages and has been renamed to reflect new APIs possibilities.
Find more informations about this change here.

Support

package name	version	react-native version
react-native-localize	1.0.0+	0.56.0+
react-native-languages	2.0.1	0.48.0 - 0.55.4

Setup

$ npm install --save react-native-localize
# --- or ---
$ yarn add react-native-localize

🆘 Manual linking

⚠️ If you use a version of React Native prior to 0.60.0, you can follow the linking instructions here.

If you use this package with React Native 0.60.0or superior, you will probably don't need to link it. Otherwise if it still cannot be found, follow this steps to link it manually :

iOS

Add this line to your ios/Podfile file, then run pod install.

target 'YourAwesomeProject' do
  # …
  pod 'RNLocalize', :path => '../node_modules/react-native-localize'
end

Android

Add the following lines to android/settings.gradle:

include ':react-native-localize'
project(':react-native-localize').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-localize/android')

Add the implementation line to the dependencies in android/app/build.gradle:

dependencies {
  // ...
  implementation project(':react-native-localize')
}

Add the import and link the package in MainApplication.java:

import com.reactcommunity.rnlocalize.RNLocalizePackage; // <- add the RNLocalizePackage import

public class MainApplication extends Application implements ReactApplication {

  // …

  @Override
  protected List<ReactPackage> getPackages() {
    @SuppressWarnings("UnnecessaryLocalVariable")
    List<ReactPackage> packages = new PackageList(this).getPackages();
    // …
    packages.add(new RNLocalizePackage());
    return packages;
  }

  // …
}

Basic usage example

import * as RNLocalize from "react-native-localize";

console.log(RNLocalize.getLocales());
console.log(RNLocalize.getCurrencies());

RNLocalize.addEventListener("change", () => {
  // do localization related stuff…
});

API

getLocales()

Returns the user preferred locales, in order.

Method type

type getLocales = () => Array<{
  languageCode: string;
  scriptCode?: string;
  countryCode: string;
  languageTag: string;
  isRTL: boolean;
}>;

Usage example

console.log(RNLocalize.getLocales());
/* -> [
  { countryCode: "GB", languageTag: "en-GB", languageCode: "en", isRTL: false },
  { countryCode: "US", languageTag: "en-US", languageCode: "en", isRTL: false },
  { countryCode: "FR", languageTag: "fr-FR", languageCode: "fr", isRTL: false },
] */

getNumberFormatSettings()

Returns number formatting settings.

Method type

type getNumberFormatSettings = () => {
  decimalSeparator: string;
  groupingSeparator: string;
};

Usage example

console.log(RNLocalize.getNumberFormatSettings());
/* -> {
  decimalSeparator: ".",
  groupingSeparator: ",",
} */

getCurrencies()

Returns the user preferred currency codes, in order.

Method type

type getCurrencies = () => Array<string>;

Usage example

console.log(RNLocalize.getCurrencies());
// -> ["EUR", "GBP", "USD"]

getCountry()

Returns the user current country code (based on its device locale, not on its position).

Method type

type getCountry = () => string;

Usage example

console.log(RNLocalize.getCountry());
// -> "FR"

getCalendar()

Returns the user preferred calendar format.

Method type

type getCalendar = () => "gregorian" | "japanese" | "buddhist";

Usage example

console.log(RNLocalize.getCalendar());
// -> "gregorian"

getTemperatureUnit()

Returns the user preferred temperature unit.

Method type

type getTemperatureUnit = () => "celsius" | "fahrenheit";

Usage example

console.log(RNLocalize.getTemperatureUnit());
// -> "celsius"

getTimeZone()

Returns the user preferred timezone (based on its device settings, not on its position).

Method type

type getTimeZone = () => string;

Usage example

console.log(RNLocalize.getTimeZone());
// -> "Europe/Paris"

uses24HourClock()

Returns true if the user prefers 24h clock format, false if he prefers 12h clock format.

Method type

type uses24HourClock = () => boolean;

Usage example

console.log(RNLocalize.uses24HourClock());
// -> true

usesMetricSystem()

Returns true if the user prefers metric measure system, false if he prefers imperial.

Method type

type usesMetricSystem = () => boolean;

Usage example

console.log(RNLocalize.usesMetricSystem());
// -> true

addEventListener() / removeEventListener()

Allows you to listen for any localization change.

Methods type

type addEventListener = (type: "change", handler: Function) => void;
type removeEventListener = (type: "change", handler: Function) => void;

Usage example

function handleLocalizationChange() {
  console.log(RNLocalize.getLocales());
}

RNLocalize.addEventListener("change", handleLocalizationChange);
// …later (ex: component unmount)
RNLocalize.removeEventListener("change", handleLocalizationChange);

findBestAvailableLanguage()

Returns the best language tag possible and its reading direction (⚠️ it respects the user preferred languages list order, see explanations). Useful to pick the best translation available.

Method type

type findBestAvailableLanguage = (
  languageTags: Array<string>,
) => { languageTag: string; isRTL: boolean } | void;

Usage example

console.log(RNLocalize.findBestAvailableLanguage(["en-US", "en", "fr"]));
// -> { languageTag: "en-US", isRTL: false }

Examples with i18n-js

Browse the files in the /example directory.

How to test your code

Because it's a native module, you might need to mock this package to run your tests flawlessly.
Here is an example for Jest, adapt it to your needs :

// __mocks__/react-native-localize.js

const getLocales = () => [
  // you can choose / add the locales you want
  { countryCode: "US", languageTag: "en-US", languageCode: "en", isRTL: false },
  { countryCode: "FR", languageTag: "fr-FR", languageCode: "fr", isRTL: false },
];

// use a provided translation, or return undefined to test your fallback
const findBestAvailableLanguage = () => ({
  languageTag: "en-US",
  isRTL: false,
});

const getNumberFormatSettings = () => ({
  decimalSeparator: ".",
  groupingSeparator: ",",
});

const getCalendar = () => "gregorian"; // or "japanese", "buddhist"
const getCountry = () => "US"; // the country code you want
const getCurrencies = () => ["USD", "EUR"]; // can be empty array
const getTemperatureUnit = () => "celsius"; // or "fahrenheit"
const getTimeZone = () => "Europe/Paris"; // the timezone you want
const uses24HourClock = () => true;
const usesMetricSystem = () => true;

const addEventListener = jest.fn();
const removeEventListener = jest.fn();

export {
  findBestAvailableLanguage,
  getLocales,
  getNumberFormatSettings,
  getCalendar,
  getCountry,
  getCurrencies,
  getTemperatureUnit,
  getTimeZone,
  uses24HourClock,
  usesMetricSystem,
  addEventListener,
  removeEventListener,
};

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