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next.js/packages/next/client/index.js

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import React from 'react'
import ReactDOM from 'react-dom'
import HeadManager from './head-manager'
import { createRouter } from 'next/router'
import EventEmitter from 'next-server/dist/lib/event-emitter'
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import {loadGetInitialProps, getURL} from 'next-server/dist/lib/utils'
import PageLoader from './page-loader'
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import * as envConfig from 'next-server/config'
import ErrorBoundary from './error-boundary'
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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.
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// See: https://webpack.js.org/guides/code-splitting/#dynamic-imports
if (!window.Promise) {
window.Promise = Promise
}
const data = JSON.parse(document.getElementById('__NEXT_DATA__').textContent)
window.__NEXT_DATA__ = data
const {
props,
err,
page,
query,
buildId,
assetPrefix,
runtimeConfig,
dynamicIds
} = data
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/config with the environment configuration
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envConfig.setConfig({
serverRuntimeConfig: {},
publicRuntimeConfig: runtimeConfig
})
Universal Webpack (#3578) * Speed up next build * Document webpack config * Speed up next build * Remove comment * Add comment * Clean up rules * Add comments * Run in parallel * Push plugins seperately * Create a new chunk for react * Don’t uglify react since it’s already uglified. Move react to commons in development * Use the minified version directly * Re-add globpattern * Move loaders into a separate variable * Add comment linking to Dan’s explanation * Remove dot * Add universal webpack * Initial dev support * Fix linting * Add changes from Arunoda's work * Made next dev works. But super slow and no HMR support. * Fix client side hot reload * Server side hmr * Only in dev * Add on-demand-entries client + hot-middleware * Add .babelrc support * Speed up on demand entries by running in parallel * Serve static generated files * Add missing config in dev * Add sass support * Add support for .map * Add cssloader config and fix .jsx support * Rename * use same defaults as css-loader. Fix linting * Add NoEmitErrorsPlugin * Add clientBootstrap * Use webpackhotmiddleware on the multi compiler * alpha.3 * Use babel 16.2.x * Fix reloading after error * Remove comment * Release 5.0.0-univeral-alpha.1 * Remove check for React 16 * Release 5.0.0-universal-alpha.2 * React hot loader v4 * Use our static file rendering machanism to serve pages. This should work well since the file path for a page is predictable. * Release 5.0.0-universal-alpha.3 * Remove optional loaders * Release 5.0.0-universal-alpha.4 * Remove clientBootstrap * Remove renderScript * Make sure pages bundles are served correctly * Remove unused import * Revert to using the same code as canary * Fix hot loader * Release 5.0.0-universal-alpha.5 * Check if externals dir exist before applying config * Add typescript support * Add support for transpiling certain packages in node_modules Thanks to @giuseppeg’s work in https://github.com/zeit/next.js/pull/3319 * Add BABEL_DISABLE_CACHE support * Make sourcemaps in production opt-in * Revert "Add support for transpiling certain packages in node_modules" This reverts commit d4b1d9babfb4b9ed4f4b12d56d52dee233e862da. In favor of a better api around this. * Support typescript through next.config.js * Remove comments * Bring back commons.js calculation * Remove unused dependencies * Move base.config.js to webpack.js * Make sure to only invalidate webpackDevMiddleware one after other. * Allow babel-loder caching by default. * Add comment about preact support * Bring back buildir replace * Remove obsolete plugin * Remove build replace, speed up build * Resolve page entries like pages/day/index.js to pages/day.js * Add componentDidCatch back * Compile to bundles * Use config.distDir everywhere * Make sure the file is an array * Remove console.log * Apply optimization to uglifyjs * Add comment pointing to source * Create entries the same way in dev and production * Remove unused and broken pagesGlobPattern * day/index.js is automatically turned into day.js at build time * Remove poweredByHeader option * Load pages with the correct path. * Release 5.0.0-universal-alpha.6 * Make sure react-dom/server can be overwritten by module-alias * Only add react-hot-loader babel plugin in dev * Release 5.0.0-universal-alpha.7 * Revert tests * Release 5.0.0-universal-alpha.10 * Make sure next/head is working properly. * Add wepack alias for 'next' back. * Make sure overriding className in next/head works * Alias react too * Add missing r * Fragment fallback has to wrap the children * Use min.js * Remove css.js * Remove wallaby.js * Release 5.0.0-universal-alpha.11 * Resolve relative to workdir instead of next * Make sure we touch the right file * Resolve next modules * Remove dotjsx removal plugins since we use webpack on the server * Revert "Resolve relative to workdir instead of next" This reverts commit a13f3e4ab565df9e2c9a3dfc8eb4009c0c2e02ed. * Externalize any locally loaded module lives outside of app dir. * Remove server aliases * Check node_modules reliably * Add symlink to next for tests * Make sure dynamic imports work locally. This is why we need it: https://github.com/webpack/webpack/blob/b545b519b2024e3f8be3041385bd326bf5d24449/lib/MainTemplate.js#L68 We need to have the finally clause in the above in __webpack_require__. webpack output option strictModuleExceptionHandling does that. * dynmaic -> dynamic * Remove webpack-node-externals * Make sure dynamic imports support SSR. * Remove css support in favor of next-css * Make sure we load path from `/` since it’s included in the path matching * Catch when ensurepage couldn’t be fulfilled for `.js.map` * Register require cache flusher for both client and server * Add comment explaining this is to facilitate hot reloading * Only load module when needed * Remove unused modules * Release 5.0.0-universal-alpha.12 * Only log the `found babel` message once * Make sure ondemand entries working correctly. Now we are just using a single instance of OnDemandEntryHandler. * Better sourcemaps * Release 5.0.0-universal-alpha.13 * Lock uglify version to 1.1.6 * Release 5.0.0-universal-alpha.14 * Fix a typo. * Introduce multi-zones support for mircofrontends * Add section on css
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const asPath = getURL()
const pageLoader = new PageLoader(buildId, prefix)
const register = ([r, f]) => pageLoader.registerPage(r, f)
if (window.__NEXT_P) {
window.__NEXT_P.map(register)
}
window.__NEXT_P = []
window.__NEXT_P.push = register
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const headManager = new HeadManager()
const appContainer = document.getElementById('__next')
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let lastAppProps
let webpackHMR
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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
}
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ErrorComponent = await pageLoader.loadPage('/_error')
App = await pageLoader.loadPage('/_app')
let initialErr = err
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try {
Component = await pageLoader.loadPage(page)
if (process.env.NODE_ENV !== 'production') {
const { isValidElementType } = require('react-is')
if (!isValidElementType(Component)) {
throw new Error(`The default export is not a React Component in page: "${page}"`)
}
}
} catch (error) {
// This catches errors like throwing in the top level of a module
initialErr = error
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}
await Loadable.preloadReady(dynamicIds || [])
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router = createRouter(page, query, asPath, {
initialProps: props,
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pageLoader,
App,
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Component,
ErrorComponent,
err: initialErr
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})
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) {
Universal Webpack (#3578) * Speed up next build * Document webpack config * Speed up next build * Remove comment * Add comment * Clean up rules * Add comments * Run in parallel * Push plugins seperately * Create a new chunk for react * Don’t uglify react since it’s already uglified. Move react to commons in development * Use the minified version directly * Re-add globpattern * Move loaders into a separate variable * Add comment linking to Dan’s explanation * Remove dot * Add universal webpack * Initial dev support * Fix linting * Add changes from Arunoda's work * Made next dev works. But super slow and no HMR support. * Fix client side hot reload * Server side hmr * Only in dev * Add on-demand-entries client + hot-middleware * Add .babelrc support * Speed up on demand entries by running in parallel * Serve static generated files * Add missing config in dev * Add sass support * Add support for .map * Add cssloader config and fix .jsx support * Rename * use same defaults as css-loader. Fix linting * Add NoEmitErrorsPlugin * Add clientBootstrap * Use webpackhotmiddleware on the multi compiler * alpha.3 * Use babel 16.2.x * Fix reloading after error * Remove comment * Release 5.0.0-univeral-alpha.1 * Remove check for React 16 * Release 5.0.0-universal-alpha.2 * React hot loader v4 * Use our static file rendering machanism to serve pages. This should work well since the file path for a page is predictable. * Release 5.0.0-universal-alpha.3 * Remove optional loaders * Release 5.0.0-universal-alpha.4 * Remove clientBootstrap * Remove renderScript * Make sure pages bundles are served correctly * Remove unused import * Revert to using the same code as canary * Fix hot loader * Release 5.0.0-universal-alpha.5 * Check if externals dir exist before applying config * Add typescript support * Add support for transpiling certain packages in node_modules Thanks to @giuseppeg’s work in https://github.com/zeit/next.js/pull/3319 * Add BABEL_DISABLE_CACHE support * Make sourcemaps in production opt-in * Revert "Add support for transpiling certain packages in node_modules" This reverts commit d4b1d9babfb4b9ed4f4b12d56d52dee233e862da. In favor of a better api around this. * Support typescript through next.config.js * Remove comments * Bring back commons.js calculation * Remove unused dependencies * Move base.config.js to webpack.js * Make sure to only invalidate webpackDevMiddleware one after other. * Allow babel-loder caching by default. * Add comment about preact support * Bring back buildir replace * Remove obsolete plugin * Remove build replace, speed up build * Resolve page entries like pages/day/index.js to pages/day.js * Add componentDidCatch back * Compile to bundles * Use config.distDir everywhere * Make sure the file is an array * Remove console.log * Apply optimization to uglifyjs * Add comment pointing to source * Create entries the same way in dev and production * Remove unused and broken pagesGlobPattern * day/index.js is automatically turned into day.js at build time * Remove poweredByHeader option * Load pages with the correct path. * Release 5.0.0-universal-alpha.6 * Make sure react-dom/server can be overwritten by module-alias * Only add react-hot-loader babel plugin in dev * Release 5.0.0-universal-alpha.7 * Revert tests * Release 5.0.0-universal-alpha.10 * Make sure next/head is working properly. * Add wepack alias for 'next' back. * Make sure overriding className in next/head works * Alias react too * Add missing r * Fragment fallback has to wrap the children * Use min.js * Remove css.js * Remove wallaby.js * Release 5.0.0-universal-alpha.11 * Resolve relative to workdir instead of next * Make sure we touch the right file * Resolve next modules * Remove dotjsx removal plugins since we use webpack on the server * Revert "Resolve relative to workdir instead of next" This reverts commit a13f3e4ab565df9e2c9a3dfc8eb4009c0c2e02ed. * Externalize any locally loaded module lives outside of app dir. * Remove server aliases * Check node_modules reliably * Add symlink to next for tests * Make sure dynamic imports work locally. This is why we need it: https://github.com/webpack/webpack/blob/b545b519b2024e3f8be3041385bd326bf5d24449/lib/MainTemplate.js#L68 We need to have the finally clause in the above in __webpack_require__. webpack output option strictModuleExceptionHandling does that. * dynmaic -> dynamic * Remove webpack-node-externals * Make sure dynamic imports support SSR. * Remove css support in favor of next-css * Make sure we load path from `/` since it’s included in the path matching * Catch when ensurepage couldn’t be fulfilled for `.js.map` * Register require cache flusher for both client and server * Add comment explaining this is to facilitate hot reloading * Only load module when needed * Remove unused modules * Release 5.0.0-universal-alpha.12 * Only log the `found babel` message once * Make sure ondemand entries working correctly. Now we are just using a single instance of OnDemandEntryHandler. * Better sourcemaps * Release 5.0.0-universal-alpha.13 * Lock uglify version to 1.1.6 * Release 5.0.0-universal-alpha.14 * Fix a typo. * Introduce multi-zones support for mircofrontends * Add section on css
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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.
Fix #4574: getInitialProps is not called on _error page for client-side errors (#4764) ## What's wrong This problem is specific to errors that happen on the client _after_ the initial mounting of the component. (The router has special logic to handle exceptions thrown in `getInitialProps` during a client-side navigation, and I've confirmed this logic is correct.) Specifically, if the page is mounted, and you raise an exception on the page, the exception will cause the error page to be mounted without ever invoking `getInitialProps` on the new App/Error page pairing. This has been illustrated with multiple repros in #4574. ## Why is it broken This regression was introduced two months ago in #4156, where the invocation of `getInitialProps` was removed from the app's top-level error handler. Specifically, [this line](https://github.com/zeit/next.js/pull/4156/files#diff-895656aeaccff5d7c0f56a113ede9662L147) was removed and [replaced by a comment](https://github.com/zeit/next.js/pull/4156/files#diff-895656aeaccff5d7c0f56a113ede9662R167) that says that "`App` will handle the calling of `getInitialProps`". I believe the sentiment about "`App` will handle calling `getInitialProps`" is mistaken. In fact, it really doesn't make sense on its face, since it would require an instance lifecycle method of `App` (which is mounted immediately after the comment) to invoke the `static getInitialProps` method on the error page. ## How I fixed it I've fixed this in a fork by restoring Lines 146 – 148 that were removed in #4156. I think this is the right fix, but Next.js's handling of `getInitialProps` could certainly be improved. (The code in [this conditional](https://github.com/zeit/next.js/blob/86d01706a67cee5c80796974d04c1e11cdff453a/client/index.js#L173) speaks to the unnecessary complexity around this.)
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// 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
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: await loadGetInitialProps(App, {Component: ErrorComponent, router, ctx: {err, pathname: page, query, asPath}})
Fix #4574: getInitialProps is not called on _error page for client-side errors (#4764) ## What's wrong This problem is specific to errors that happen on the client _after_ the initial mounting of the component. (The router has special logic to handle exceptions thrown in `getInitialProps` during a client-side navigation, and I've confirmed this logic is correct.) Specifically, if the page is mounted, and you raise an exception on the page, the exception will cause the error page to be mounted without ever invoking `getInitialProps` on the new App/Error page pairing. This has been illustrated with multiple repros in #4574. ## Why is it broken This regression was introduced two months ago in #4156, where the invocation of `getInitialProps` was removed from the app's top-level error handler. Specifically, [this line](https://github.com/zeit/next.js/pull/4156/files#diff-895656aeaccff5d7c0f56a113ede9662L147) was removed and [replaced by a comment](https://github.com/zeit/next.js/pull/4156/files#diff-895656aeaccff5d7c0f56a113ede9662R167) that says that "`App` will handle the calling of `getInitialProps`". I believe the sentiment about "`App` will handle calling `getInitialProps`" is mistaken. In fact, it really doesn't make sense on its face, since it would require an instance lifecycle method of `App` (which is mounted immediately after the comment) to invoke the `static getInitialProps` method on the error page. ## How I fixed it I've fixed this in a fork by restoring Lines 146 – 148 that were removed in #4156. I think this is the right fix, but Next.js's handling of `getInitialProps` could certainly be improved. (The code in [this conditional](https://github.com/zeit/next.js/blob/86d01706a67cee5c80796974d04c1e11cdff453a/client/index.js#L173) speaks to the unnecessary complexity around this.)
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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 })
}