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next.js/packages/next/client/index.js
2018-10-02 00:55:31 +02:00

202 lines
5.9 KiB
JavaScript

import React from 'react'
import ReactDOM from 'react-dom'
import HeadManager from './head-manager'
import { createRouter } from 'next-server/dist/lib/router'
import EventEmitter from 'next-server/dist/lib/EventEmitter'
import {loadGetInitialProps, getURL} from 'next-server/dist/lib/utils'
import PageLoader from '../lib/page-loader'
import * as asset from 'next-server/asset'
import * as envConfig from 'next-server/config'
import ErrorBoundary from './error-boundary'
import Loadable from 'next-server/dist/lib/loadable'
// Polyfill Promise globally
// This is needed because Webpack's dynamic loading(common chunks) code
// depends on Promise.
// So, we need to polyfill it.
// See: https://webpack.js.org/guides/code-splitting/#dynamic-imports
if (!window.Promise) {
window.Promise = Promise
}
const {
__NEXT_DATA__: {
props,
err,
page,
pathname,
query,
buildId,
assetPrefix,
runtimeConfig,
dynamicIds
}
} = window
const prefix = assetPrefix || ''
// With dynamic assetPrefix it's no longer possible to set assetPrefix at the build time
// So, this is how we do it in the client side at runtime
__webpack_public_path__ = `${prefix}/_next/` //eslint-disable-line
// Initialize next/asset with the assetPrefix
asset.setAssetPrefix(prefix)
// Initialize next/config with the environment configuration
envConfig.setConfig({
serverRuntimeConfig: {},
publicRuntimeConfig: runtimeConfig
})
const asPath = getURL()
const pageLoader = new PageLoader(buildId, prefix)
window.__NEXT_LOADED_PAGES__.forEach(([r, f]) => {
pageLoader.registerPage(r, f)
})
delete window.__NEXT_LOADED_PAGES__
window.__NEXT_REGISTER_PAGE = pageLoader.registerPage.bind(pageLoader)
const headManager = new HeadManager()
const appContainer = document.getElementById('__next')
let lastAppProps
let webpackHMR
export let router
export let ErrorComponent
let Component
let App
export const emitter = new EventEmitter()
export default async ({
webpackHMR: passedWebpackHMR
} = {}) => {
// This makes sure this specific line is removed in production
if (process.env.NODE_ENV === 'development') {
webpackHMR = passedWebpackHMR
}
ErrorComponent = await pageLoader.loadPage('/_error')
App = await pageLoader.loadPage('/_app')
let initialErr = err
try {
Component = await pageLoader.loadPage(page)
if (typeof Component !== 'function') {
throw new Error(`The default export is not a React Component in page: "${pathname}"`)
}
} catch (error) {
// This catches errors like throwing in the top level of a module
initialErr = error
}
await Loadable.preloadReady(dynamicIds || [])
router = createRouter(pathname, query, asPath, {
initialProps: props,
pageLoader,
App,
Component,
ErrorComponent,
err: initialErr
})
router.subscribe(({ App, Component, props, err }) => {
render({ App, Component, props, err, emitter })
})
render({ App, Component, props, err: initialErr, emitter })
return emitter
}
export async function render (props) {
if (props.err) {
await renderError(props)
return
}
try {
await doRender(props)
} catch (err) {
await renderError({...props, err})
}
}
// This method handles all runtime and debug errors.
// 404 and 500 errors are special kind of errors
// and they are still handle via the main render method.
export async function renderError (props) {
const {App, err} = props
if (process.env.NODE_ENV !== 'production') {
throw webpackHMR.prepareError(err)
}
// Make sure we log the error to the console, otherwise users can't track down issues.
console.error(err)
// In production we do a normal render with the `ErrorComponent` as component.
// If we've gotten here upon initial render, we can use the props from the server.
// Otherwise, we need to call `getInitialProps` on `App` before mounting.
const initProps = props.props
? props.props
: await loadGetInitialProps(App, {Component: ErrorComponent, router, ctx: {err, pathname, query, asPath}})
await doRender({...props, err, Component: ErrorComponent, props: initProps})
}
let isInitialRender = true
function renderReactElement (reactEl, domEl) {
// The check for `.hydrate` is there to support React alternatives like preact
if (isInitialRender && typeof ReactDOM.hydrate === 'function') {
ReactDOM.hydrate(reactEl, domEl)
isInitialRender = false
} else {
ReactDOM.render(reactEl, domEl)
}
}
async function doRender ({ App, Component, props, err, emitter: emitterProp = emitter }) {
// Usual getInitialProps fetching is handled in next/router
// this is for when ErrorComponent gets replaced by Component by HMR
if (!props && Component &&
Component !== ErrorComponent &&
lastAppProps.Component === ErrorComponent) {
const { pathname, query, asPath } = router
props = await loadGetInitialProps(App, {Component, router, ctx: {err, pathname, query, asPath}})
}
Component = Component || lastAppProps.Component
props = props || lastAppProps.props
const appProps = { Component, err, router, headManager, ...props }
// lastAppProps has to be set before ReactDom.render to account for ReactDom throwing an error.
lastAppProps = appProps
emitterProp.emit('before-reactdom-render', { Component, ErrorComponent, appProps })
// In development runtime errors are caught by react-error-overlay.
if (process.env.NODE_ENV === 'development') {
renderReactElement((
<App {...appProps} />
), appContainer)
} else {
// In production we catch runtime errors using componentDidCatch which will trigger renderError.
const onError = async (error) => {
try {
await renderError({App, err: error})
} catch (err) {
console.error('Error while rendering error page: ', err)
}
}
renderReactElement((
<ErrorBoundary onError={onError}>
<App {...appProps} />
</ErrorBoundary>
), appContainer)
}
emitterProp.emit('after-reactdom-render', { Component, ErrorComponent, appProps })
}