TodoItem.js

class TodoItem extends React.Component {
  render() {
    const item = this.props.item;
    // ...
  }
}

export default createFragmentContainer(
  TodoItem,
  item: graphql`
    # Fragment name uses underscore to denote property name
    fragment TodoItem_item on Todo {
      # Properties available on the item component property
      text
      isComplete
    }
  `,
);