React

HTML

<div id="app"></div>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

li {
  margin: 8px 0;
}

h2 {
  font-weight: bold;
  margin-bottom: 15px;
}

.done {
  color: rgba(0, 0, 0, 0.3);
  text-decoration: line-through;
}

input {
  margin-right: 5px;
}

React

class SampleApp extends React.Component {
  constructor(props) {
    super(props)
    this.state = {
			name: "old value"     
    }
  }
  
  handleChange = (e) => {
  	console.log(e);
  	this.setState({name: e.target.value});
  }
  
  render() {
    return (
      <div>
        <h2>Sample:</h2>
        <div>
          <input 
            id="inp"
            type="text" 
            value={this.state.name} 
            onChange={this.handleChange} 
          />
        </div>
      </div>
    )
  }
}

ReactDOM.render(<SampleApp />, document.querySelector("#app"))

setTimeout(() => {
	const event = new Event("change", 
  	{ 
    	bubbles: true, 
      cancelable: true, 
      view: window
  	});
  console.log(event);
  const element = document.querySelector("#inp");
  element.value = "new value";
	const cancelled = element.dispatchEvent(event);
  console.log(cancelled);
}, 500);