index.js

  static childContextTypes = {
    formatCurrency: React.PropTypes.func,
  };

  getChildContext() {
    const { context } = this;
    const { intl } = context;
    return !intl ? context : { ...context,
      formatCurrency: (n) => intl.formatNumber(n, {
        style: 'currency',
        currency: 'CAD',
        currencyDisplay: 'symbol',
      }),
    };
  }