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next.js/lib/app.js

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import React, { Component, PropTypes } from 'react'
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import { AppContainer } from 'react-hot-loader'
import { warn } from './utils'
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export default class App extends Component {
static childContextTypes = {
router: PropTypes.object,
headManager: PropTypes.object
}
constructor (props) {
super(props)
this.state = propsToState(props)
this.close = null
}
componentWillReceiveProps (nextProps) {
const state = propsToState(nextProps)
try {
this.setState(state)
} catch (err) {
this.handleError(err)
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}
}
componentDidMount () {
const { router } = this.props
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this.close = router.subscribe((data) => {
const props = data.props || this.state.props
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const state = propsToState({
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...data,
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props,
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router
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})
try {
this.setState(state)
} catch (err) {
this.handleError(err)
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}
})
}
componentWillUnmount () {
if (this.close) this.close()
}
getChildContext () {
const { router, headManager } = this.props
return { router, headManager }
}
render () {
const { Component, props } = this.state
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return <AppContainer>
<Component {...props} />
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</AppContainer>
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}
async handleError (err) {
console.error(err)
const { router, ErrorComponent } = this.props
const { pathname, query } = router
const props = await ErrorComponent.getInitialProps({ err, pathname, query })
const state = propsToState({ Component: ErrorComponent, props, router })
try {
this.setState(state)
} catch (err2) {
console.error(err2)
}
}
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}
function propsToState (props) {
const { Component, router } = props
const url = {
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)
}
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}
return {
Component,
props: { ...props.props, url }
}
}