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next.js/test/integration/page-extensions/pages/hmr/some-page.tsx

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import React from 'react'
if(typeof window !== 'undefined' && !window['HMR_RANDOM_NUMBER']) {
window['HMR_RANDOM_NUMBER'] = Math.random()
}
export default class Counter extends React.Component {
state = { count: 0 }
incr () {
const { count } = this.state
this.setState({ count: count + 1 })
}
render () {
return (
<div>
<p>COUNT: {this.state.count}</p>
<button onClick={() => this.incr()}>Increment</button>
</div>
)
}
}