old_contents: 'use strict';
  
  import React from 'react';
  
  import ActivityIndicator from './pure/activityIndicator';
  
  import ui from '../../ui';
  
  class Loading extends React.Component {
  
    static propTypes = {
      dispatch: React.PropTypes.func.isRequired,
      kind: React.PropTypes.oneOfType([
        React.PropTypes.string,
        React.PropTypes.arrayOf(React.PropTypes.string)
      ]).isRequired,
      uri: React.PropTypes.string.isRequired,
      where: React.PropTypes.string.isRequired
    };
  
    constructor(props) {
      super(props);
    }
  
    componentDidMount() {
      const { dispatch, kind, uri, where, readId } = this.props;
      dispatch({type: 'READ_PERFORM', uri, where, kind, readId});
    }
  
    render() {
      return (
        <ActivityIndicator />
      );
    }
  }
  
  ui.register(['__loading'], ({ element, dispatch}) => {
    return (
      <Loading
        kind={element.get('kind').toJS()}
        uri={element.get('uri')}
        where={element.get('where', 'content')}
        dispatch={dispatch}
        readId={element.get('readId')}/>
    );
  });
  
new_contents: 'use strict';
  
  import React from 'react';
  
  import ActivityIndicator from './pure/activityIndicator';
  
  import ui from '../../ui';
  
  class Loading extends React.Component {
  
    static propTypes = {
      dispatch: React.PropTypes.func.isRequired,
      kind: React.PropTypes.oneOfType([
        React.PropTypes.string,
        React.PropTypes.arrayOf(React.PropTypes.string)
      ]).isRequired,
      uri: React.PropTypes.string.isRequired,
      where: React.PropTypes.string.isRequired,
      readId: React.PropTypes.string.isRequired
    };
  
    constructor(props) {
      super(props);
    }
  
    componentDidMount() {
      const { dispatch, kind, uri, where, readId } = this.props;
      dispatch({type: 'READ_PERFORM', uri, where, kind, readId});
    }
  
    render() {
      return (
        <ActivityIndicator />
      );
    }
  }
  
  ui.register(['__loading'], ({ element, dispatch}) => {
    return (
      <Loading
        kind={element.get('kind').toJS()}
        uri={element.get('uri')}
        where={element.get('where', 'content')}
        dispatch={dispatch}
        readId={element.get('readId')}/>
    );
  });
  
subject: Add missing prop validation for readId