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next.js/client/next-dev.js

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import evalScript from '../lib/eval-script'
const { __NEXT_DATA__: { errorComponent } } = window
const ErrorComponent = evalScript(errorComponent).default
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require('react-hot-loader/patch')
const next = window.next = require('./')
const emitter = next.default(onError)
function onError (err) {
// just show the debug screen but don't render ErrorComponent
// so that the current component doesn't lose props
next.render({ err, emitter })
}
let lastScroll
emitter.on('before-reactdom-render', ({ Component }) => {
// Remember scroll when ErrorComponent is being rendered to later restore it
if (!lastScroll && Component === ErrorComponent) {
const { pageXOffset, pageYOffset } = window
lastScroll = {
x: pageXOffset,
y: pageYOffset
}
}
})
emitter.on('after-reactdom-render', ({ Component }) => {
if (lastScroll && Component !== ErrorComponent) {
// Restore scroll after ErrorComponent was replaced with a page component by HMR
const { x, y } = lastScroll
window.scroll(x, y)
lastScroll = null
}
})