| 1 | const React = global.React; |
| 2 | const ReactDOM = global.ReactDOM; |
| 3 | |
| 4 | class Counter extends React.unstable_AsyncComponent { |
| 5 | state = {counter: 0}; |
| 6 | onCommit() { |
| 7 | setImmediate(() => { |
| 8 | this.setState(state => ({ |
| 9 | counter: state.counter + 1, |
| 10 | })); |
| 11 | }); |
| 12 | } |
| 13 | componentDidMount() { |
| 14 | this.onCommit(); |
| 15 | } |
| 16 | componentDidUpdate() { |
| 17 | this.onCommit(); |
| 18 | } |
| 19 | render() { |
| 20 | return <h1>{this.state.counter}</h1>; |
| 21 | } |
| 22 | } |
| 23 | |
| 24 | const interval = 200; |
| 25 | function block() { |
| 26 | const endTime = performance.now() + interval; |
| 27 | while (performance.now() < endTime) {} |
| 28 | } |
| 29 | setInterval(block, interval); |
| 30 | |
| 31 | // Should render a counter that increments approximately every second (the |
| 32 | // expiration time of a low priority update). |
| 33 | ReactDOM.render(<Counter />, document.getElementById('root')); |
| 34 | block(); |