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next.js/client/webpack-hot-middleware-client.js

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import webpackHotMiddlewareClient from 'webpack-hot-middleware/client?overlay=false&reload=true&path=/_next/webpack-hmr'
import Router from '../lib/router'
export default () => {
const handlers = {
reload (route) {
if (route === '/_error') {
for (const r of Object.keys(Router.components)) {
const { err } = Router.components[r]
if (err) {
// reload all error routes
// which are expected to be errors of '/_error' routes
Router.reload(r)
}
}
return
}
if (route === '/_document') {
window.location.reload()
return
}
Router.reload(route)
},
change (route) {
if (route === '/_document') {
window.location.reload()
return
}
const { err, Component } = Router.components[route] || {}
if (err) {
// reload to recover from runtime errors
Router.reload(route)
}
if (Router.route !== route) {
// If this is a not a change for a currently viewing page.
// We don't need to worry about it.
return
}
if (!Component) {
// This only happens when we create a new page without a default export.
// If you removed a default export from a exising viewing page, this has no effect.
console.log(`Hard reloading due to no default component in page: ${route}`)
window.location.reload()
}
}
}
webpackHotMiddlewareClient.subscribe((obj) => {
const fn = handlers[obj.action]
if (fn) {
const data = obj.data || []
fn(...data)
} else {
throw new Error('Unexpected action ' + obj.action)
}
})
}