Intlized Components

This package provides an easy way for internationalization support in React.js apps.

Problem

In many - but not all - cases language variables are tied to one component in React, but most i18n libraries do not fit into a component based approach.

Solution

This package solves this issue and helps you to define language messages component based by providing component based dictionaries. Also each prop of a component can be "intlized", so that it can be used with a language variable or with formatting (date time, number and time ago).

Installation

npm install intlized-components
# or
yarn add intlized-components

Examples

Translation Example

The most convient way to use intlized components is to create a local dictionary for every component, define intlized components and use the predefined <Trans> component. Basically with intlized components you can use any component as intlized component, just import the intlized function and wrap the component. But in most cases you need nothing more than the <Trans> component.

import React from 'react';
import { createDict, intlized, Trans } from 'intlized-components';

// Create local dictionary: Define a scope, then define the messages with the default translation
const dict = createDict('RegistrationForm', {
  welcome: 'Welcome {name}',
  inputPlaceholder: 'Your name...',
  imageAlt: 'This image was created on {date}',
});

// wrap components, intlize props
const IntlizedInput = intlized('input', ['placeholder']);
const IntlizedImage = intlized('img', ['alt']);

// use defined messages
export default function() {
  return (
    <div>
      {/* Basic translation with variable */}
      <Trans {...dict('welcome', { name: 'dude' })} />

      {/* Intlized attribute placeholder */}
      <IntlizedInput placeholder={dict('inputPlaceholder')} />

      {/* Intlized attribute with date formatting util */}
      <IntlizedImage
        alt={({ dateTime }) =>
          dict('imageAlt', { date: dateTime('2017-07-07') })
        }
      />
    </div>
  );
}

Formatting Example

Furthermore you can format dates and numbers without intlized components:

import React from 'react';
import { DateTime, TimeAgo, Number } from 'intlized-components';

export default function({ name }) {
  return (
    <div>
      <DateTime value="2017-07-07" />
      <TimeAgo value="2017-07-07" />
      <Number value={1000} />
    </div>
  );
}

Note that all formatting components use the Intl api which is supported by most browsers and also Node.js. Only Intl.RelativeTimeFormat is relatively new and not widely supported, so we suggest to use a polyfill like relative-time-format for it.

Example with useIntl hook

This package provides a useIntl hook, which might be helpful in some use cases:

import React from 'react';
import { useIntl } from 'intlized-components';

export default function() {
  const intl = useIntl();

  if (intl.locale === 'en') {
    return <span>This text is only visible if locale is set to English.</span>;
  } else {
    return null;
  }
}

Docs

createDict

type CreateDict = (scope: string, messages: { [string]: string }) => Messages;

type Messages = (key: string, variables?: Object) => Intlized$Message;

useIntl

type useIntl = () => {
  locale: string,
  changeLocale(locale: string, messages: Object): void,
  addMessages(messages: Object): void,
  trans(...Intlized$Message): string,
  dateTime(value: string | Date): string,
  number(value: number): string,
  timeAgo(value: string | Date): string,
};

intlized

type Intlized = (
  Component: React$ElementType,
  intlizedProps: Array<string>,
) => Intlized$Component;

<Trans>

type Intlized$Trans = React$ComponentType<{ ...Intlized$Message }>;

<DateTime>

type Intlized$DateTime = React$ComponentType<{ value: string }>;

<TimeAgo>

type Intlized$TimeAgo = React$ComponentType<{ value: string }>;

<Number>

type Intlized$Number = React$ComponentType<{ value: string }>;

Misc

Babel plugin

There is a babel plugin called babel-plugin-intlized-components that helps you to extract all defined messages from the component files and to easily create translation definition files.

License

This package is released under the MIT License.