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next.js/lib/app.js
Naoyuki Kanezawa 0ef28ab128 Don't discard component state on error (#741)
* render debug page as overlay

* handle errors occurrred on rendering cycle for HMR

* retrieve props if required on HMR
2017-01-11 17:58:20 -08:00

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JavaScript

import React, { Component, PropTypes } from 'react'
import { AppContainer } from 'react-hot-loader'
import shallowEquals from './shallow-equals'
import { warn } from './utils'
const ErrorDebug = process.env.NODE_ENV === 'production'
? null : require('./error-debug').default
export default class App extends Component {
static childContextTypes = {
headManager: PropTypes.object
}
getChildContext () {
const { headManager } = this.props
return { headManager }
}
render () {
const { Component, props, err, router } = this.props
const containerProps = { Component, props, router }
return <div>
<Container {...containerProps} />
{ErrorDebug && err ? <ErrorDebug err={err} /> : null}
</div>
}
}
class Container extends Component {
shouldComponentUpdate (nextProps) {
// need this check not to rerender component which has already thrown an error
return !shallowEquals(this.props, nextProps)
}
render () {
const { Component, props, router } = this.props
const url = createUrl(router)
// includes AppContainer which bypasses shouldComponentUpdate method
// https://github.com/gaearon/react-hot-loader/issues/442
return <AppContainer>
<Component {...props} url={url} />
</AppContainer>
}
}
function createUrl (router) {
return {
query: router.query,
pathname: router.pathname,
back: () => router.back(),
push: (url, as) => router.push(url, as),
pushTo: (href, as) => {
warn(`Warning: 'url.pushTo()' is deprecated. Please use 'url.push()' instead.`)
const pushRoute = as ? href : null
const pushUrl = as || href
return router.push(pushRoute, pushUrl)
},
replace: (url, as) => router.replace(url, as),
replaceTo: (href, as) => {
warn(`Warning: 'url.replaceTo()' is deprecated. Please use 'url.replace()' instead.`)
const replaceRoute = as ? href : null
const replaceUrl = as || href
return router.replace(replaceRoute, replaceUrl)
}
}
}