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i18nFormat plugin to use ICU format with i18next







Travis Coveralls npm version David

This changes i18n format from i18next json to ICU using yahoo/intl-messageformat

Getting started

Source can be loaded via npm or downloaded from this repo.

# npm package
$ npm install i18next-icu

Wiring up:

import i18next from "i18next";
import ICU from "i18next-icu";

  • As with all modules you can either pass the constructor function (class) to the i18next.use or a concrete instance.
  • If you don't use a module loader it will be added to window.i18nextICU

Plural Support

  • While on node.js all plurals will work out of the box in browser you will need to load additional locale data files like:
import i18next from 'i18next';
import ICU from 'i18next-icu';

import fr from 'i18next-icu/locale-data/fr';

    i18nFormat: {
      localeData: fr // you also can pass in array of localeData
      formats: {

// or for react-i18next when using SSR
import i18next from 'i18next';
import ICU from 'i18next-icu';
import fr from 'i18next-icu/locale-data/fr';

const icu = new ICU();
icu.addUserDefinedFormats({ /* */ })

    i18nFormat: {}

Backend Options

  // per default icu functions are parsed once and cached for subsequent calls
  memoize: true,

  // memoize if not having a lookup and just using the key fallback as value
  memoizeFallback: false,

  // array or single object of loaded 'i18next-icu/locale-data
  localeData: null

Options can be passed in by setting options.i18nFormat in i18next.init:

import i18next from "i18next";
import ICU from "i18next-icu";

  i18nFormat: options

more complete sample

import i18next from "i18next";
import ICU from "i18next-icu";

  lng: "en",
  resources: {
    en: {
      translation: {
          "You have {numPhotos, plural, " +
          "=0 {no photos.}" +
          "=1 {one photo.}" +
          "other {# photos.}}"

i18next.t("key", { numPhotos: 1000 }); // -> You have 1,000 photos.

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