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next.js/examples/with-sw-precache/pages/index.js

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import React from 'react'
export default class extends React.PureComponent {
componentDidMount () {
if ('serviceWorker' in navigator) {
navigator.serviceWorker
.register('/service-worker.js')
.then(registration => {
console.log('service worker registration successful')
})
.catch(err => {
console.warn('service worker registration failed', err.message)
})
}
}
render () {
return (
<p>Check the console for the Service Worker registration status.</p>
)
}
}