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console

            
const { observable } = mobx;
const { observer } = mobxReact;
const { Component } = React;

const appState = observable({
  count: 0,
});
appState.increment = function() {
  this.count ++;
};
appState.decrement = function() {
  this.count --;
};

@observer
class Count extends Component {
  render() {
    return (<div>
      Counter: { appState.count } <br />
      <button onClick={this.handleInc}> + </button>
      <button onClick={this.handleDec}> - </button>
    </div>);
  }
  handleInc() {
    appState.increment();
  }
  handleDec() {
    appState.decrement();
  }
}

React.render(<Count />, document.getElementById('root'));


  


            
<body>
  <div id="root"></div>
</body>

            

                
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