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fusion-plugin-i18n-react

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Adds I18n (Internationalization) string support to a Fusion.js app.

This plugin looks for translations in the ./translations folder by default. Translations for each language are expected to be in a JSON file with a locale as a filename. For example, for U.S. English, translations should be in ./translations/en-US.json. Language tags are dictated by your browser, and likely follow the RFC 5646 specification.

For date I18n, consider using date-fns.


Table of contents


Installation

yarn add fusion-plugin-i18n-react

Usage

React component

If you are using React, we recommend using the supplied Translate component.

import React from 'react';
import {Translate, withTranslations} from 'fusion-plugin-i18n-react';

export default () => {
  return <Translate id="test" data={{name: 'world'}} />);
});

Higher order component

A higher order component is provided to allow passing translations to third-party or native components. If you are using the translate function directly, be aware that you can only pass in a string literal to this function. This plugin uses a babel transform and non-string literals (e.g. variables) will break.

import React from 'react';
import {Translate, withTranslations} from 'fusion-plugin-i18n-react';

export default withTranslations(['test'])(({translate}) => {
  return <input placeholder={translate('test', {name: 'world'})} />;
});

Examples of translation files

The default loader expects translation files to live in ./translations/{locale}.

./translations/en-US.json

{
  "HomeHeader": "Welcome!",
  "Greeting": "Hello, ${name}"
}

./translations/pt-BR.json

{
  "HomeHeader": "Bem-vindo!",
  "Greeting": "Olá, ${name}"
}

Usage:

<Translate id="HomeHeader" />
<Translate id="Greeting" data={{name: user.name}} />

Setup

// src/main.js
import React from 'react';
import App from 'fusion-react';
import I18n, {
  I18nToken,
  I18nLoaderToken,
  createI18nLoader,
} from 'fusion-plugin-i18n-react';
import {FetchToken} from 'fusion-tokens';
import fetch from 'unfetch';

export default () => {
  const app = new App(<div />);

  app.register(I18nToken, I18n);
  __NODE__
    ? app.register(I18nLoaderToken, createI18nLoader())
    : app.register(FetchToken, fetch);

  return app;
};

API

Registration API

I18n
import I18n from 'fusion-plugin-i18n-react';

The i18n plugin. Typically, it should be registered to I18nToken. Provides the i18n service

I18nToken
import {I18nToken} from 'fusion-plugin-i18n-react';

The canonical token for the I18n plugin. Typically, it should be registered with the I18n plugin.

Dependencies

I18nLoaderToken
import {I18nLoaderToken} from 'fusion-plugin-i18n-react';

A function that provides translations. Optional. Server-side only.

Types
type I18nLoader = {
  from: (ctx: Context) => {locale: string, translations: Object},
};
  • loader.from: (ctx) => ({locale, translations}) -

    • ctx: FusionContext - Required. A FusionJS context object.
    • locale: Locale - A Locale
    • translations: Object - A object that maps translation keys to translated values for the given locale
Default values

If no loader is provided, the default loader will read translations from ./translations/{locale}.json. See src/loader.js for more details.

HydrationStateToken
import {HydrationStateToken} from 'fusion-plugin-i18n-react';

Sets the hydrated state in the client, and can be useful for testing purposes. Optional. Browser only.

Types
type HydrationState = {
  chunks: Array,
  translations: Object,
};
Default values

If no hydration state is provided, this will be an empty object ({}) and have no effect.

FetchToken
import {FetchToken} from 'fusion-tokens';

A fetch implementation. Browser-only.

Types
type Fetch = (url: string, options: Object) => Promise<Response>;
  • url: string - Required. Path or URL to the resource you wish to fetch.
  • options: Object - Optional. You may optionally pass an init options object as the second argument. See Request for more details.
  • [return]: Promise<Request> - Return value from fetch. See [Response](A function that loads appropriate translations and locale information given an HTTP request context) for more details.
Default values

If no fetch implementation is provided, window.fetch is used.

Service API

const translations: string = i18n.translate(
  key: string,
  interpolations: Object
);
  • key: string - A translation key. When using createI18nLoader, it refers to a object key in a translation json file.
  • interpolations: object - A object that maps an interpolation key to a value. For example, given a translation file {"foo": "${bar} world"}, the code i18n.translate('foo', {bar: 'hello'}) returns "hello world".
  • translation: string - A translation, or key if a matching translation could not be found.

React component

If you are using React, we recommend using the supplied Translate component.

import {Translate} from 'fusion-plugin-i18n-react';

<Translate id="key" data={interpolations} />;
  • key: string - Required. Must be a hard-coded value. This plugin uses a babel transform, i.e you cannot pass a value via JSX interpolation.
  • interpolations: Object - Optional. Replaces ${value} interpolation placeholders in a translation string with the property of the specified name.

Higher order component

A higher order component is provided to allow passing translations to third-party or native components. If you are using the translate function directly, be aware that you can only pass in a string literal to this function. This plugin uses a babel transform and non-string literals (e.g. variables) will break.

import {withTranslations} from 'fusion-plugin-i18n-react';

const TranslatedComponent = withTranslations(['key'])(Component);

Be aware that the withTranslations function expects an array of string literals. This plugin uses a babel transform and the argument to this function must be an inline value, i.e. you cannot pass a variable.

The original Component receives a prop called {translate}.

Types

type TranslateProp = {
  translate: (key: string, interpolations: Object) => string,
};
type WithTranslations = (
  translationKeys: Array<string>
) => (React.Component<Props>) => React.Component<Props & TranslateProp>;
  • translationKeys: Array<string> - list of keys with which to provide translations for.
  • translate: (key: string, interpolations: Object) => string - returns the translation for the given key, with the provided interpolations.

Other examples

Custom translations loader example

// src/main.js
import React from 'react';
import App from 'fusion-react';
import I18n, {I18nToken, I18nLoaderToken} from 'fusion-plugin-i18n-react';
import {FetchToken} from 'fusion-tokens';
import fetch from 'unfetch';
import Hello from './hello';
import I18nLoader from './translations';

export default () => {
  const app = new App(<div></div>);

  app.register(I18nToken, I18n);
  __NODE__
    ? app.register(I18nLoaderToken, I18nLoader);
    : app.register(FetchToken, fetch);

  app.register(Hello);

  return app;
}

// src/hello.js
import {I18nToken} from 'fusion-plugin-i18n-react';

export default withDependencies({I18n: I18nToken})(({I18n}) => {
  return withMiddleware((ctx, next) => {
    if (__NODE__ && ctx.path === '/hello') {
      const i18n = I18n(ctx);
      ctx.body = {
        message: i18n.translate('test', {name: 'world'}), // hello world
      }
    }
    return next();
  });
});

// src/translation-loader.js
import {Locale} from 'locale';

const translationData = {
  'en-US': {
    test: "hello ${name}"
  }
}

export default (ctx) => {
  // locale could be determined in different ways,
  // e.g. from ctx.headers['accept-language'] or from a /en-US/ URL
  const locale = new Locale('en-US');
  const translations = translationData[locale];
  return {locale, translations};
}