How to use react-intl outside components

react-intl-format-message.js

import { IntlProvider } from 'react-intl';

// copied from https://gist.github.com/oun/395fabdc24cacbd78b1b37422b07e2c2

const language = 'en';
// Usually messages is declared in another file.
const messages = {
  greeting: 'Hello'
}
export const mesg = defineMessages({
  greeting: {
    id: 'greeting',
    defaultMessage: 'Whats up'
  }
};

const { intl } = new IntlProvider({ locale: language, messages: messages }, {}).getChildContext();
intl.formatMessage(mesg.greeting); // "Hello"
intl.formatNumber(1000); // "1,000"