complex.jsx

import { intlShape, injectIntl, defineMessages } from 'react-intl';

const translations = defineMessages({
  hello: {
    id: 'app.hello_world',
    defaultMessage: 'Hello World!',
  },
});

class TestComponent extends React.Component {

static propTypes = {
 intl: intlShape.isRequired,
}

render() {
     return(
        {this.props.intl.formatMessage(translations.hello)}
      )
  }
}

export default injectIntl(TestComponent)