Add runtime to hotUpdateMainFilename (#26256)

Updates the hotUpdateChunk to include `[runtime]` for web workers support.

Fixes #26152
Fixes #19865
Fixes #26144

## Bug

- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.

## Documentation / Examples

- [ ] Make sure the linting passes

package.json

@@ -79,6 +79,7 @@
     "eslint-plugin-react-hooks": "4.2.0",
     "execa": "2.0.3",
     "express": "4.17.0",
+    "faker": "5.5.3",
     "faunadb": "2.6.1",
     "firebase": "7.14.5",
     "fs-extra": "9.0.0",

packages/next/build/webpack-config.ts

@@ -510,7 +510,7 @@ export default async function getBaseWebpackConfig(
 
   // Contains various versions of the Webpack SplitChunksPlugin used in different build types
   const splitChunksConfigs: {
-    [propName: string]: webpack.Options.SplitChunksOptions
+    [propName: string]: webpack.Options.SplitChunksOptions | false
   } = {
     dev: {
       cacheGroups: {
@@ -611,9 +611,9 @@ export default async function getBaseWebpackConfig(
   }
 
   // Select appropriate SplitChunksPlugin config for this build
-  let splitChunksConfig: webpack.Options.SplitChunksOptions
+  let splitChunksConfig: webpack.Options.SplitChunksOptions | false
   if (dev) {
-    splitChunksConfig = splitChunksConfigs.dev
+    splitChunksConfig = isWebpack5 ? false : splitChunksConfigs.dev
   } else {
     splitChunksConfig = splitChunksConfigs.prodGranular
   }
@@ -940,7 +940,7 @@ export default async function getBaseWebpackConfig(
         : {}),
       // we must set publicPath to an empty value to override the default of
       // auto which doesn't work in IE11
-      publicPath: '',
+      publicPath: `${config.assetPrefix || ''}/_next/`,
       path:
         isServer && isWebpack5 && !dev
           ? path.join(outputPath, 'chunks')
@@ -959,7 +959,7 @@ export default async function getBaseWebpackConfig(
         ? 'static/webpack/[id].[fullhash].hot-update.js'
         : 'static/webpack/[id].[hash].hot-update.js',
       hotUpdateMainFilename: isWebpack5
-        ? 'static/webpack/[fullhash].hot-update.json'
+        ? 'static/webpack/[fullhash].[runtime].hot-update.json'
         : 'static/webpack/[hash].hot-update.json',
       // This saves chunks with the name given via `import()`
       chunkFilename: isServer

packages/next/client/dev/amp-dev.js

@@ -37,7 +37,12 @@ async function tryApplyUpdates() {
     return
   }
   try {
-    const res = await fetch(`${hotUpdatePath}${curHash}.hot-update.json`)
+    const res = await fetch(
+      typeof __webpack_runtime_id__ !== 'undefined'
+        ? // eslint-disable-next-line no-undef
+          `${hotUpdatePath}${curHash}.${__webpack_runtime_id__}.hot-update.json`
+        : `${hotUpdatePath}${curHash}.hot-update.json`
+    )
     const jsonData = await res.json()
     const curPage = page === '/' ? 'index' : page
     // webpack 5 uses an array instead

test/integration/amphtml/test/index.test.js

@@ -402,22 +402,16 @@ describe('AMP Usage', () => {
 
     it('should not reload unless the page is edited for an AMP page', async () => {
       let browser
+      const hmrTestPagePath = join(__dirname, '../', 'pages', 'hmr', 'test.js')
+      const originalContent = readFileSync(hmrTestPagePath, 'utf8')
       try {
         await renderViaHTTP(dynamicAppPort, '/hmr/test')
 
         browser = await webdriver(dynamicAppPort, '/hmr/amp')
         await check(() => browser.elementByCss('p').text(), /I'm an AMP page!/)
 
         const origDate = await browser.elementByCss('span').text()
-        const hmrTestPagePath = join(
-          __dirname,
-          '../',
-          'pages',
-          'hmr',
-          'test.js'
-        )
 
-        const originalContent = readFileSync(hmrTestPagePath, 'utf8')
         const editedContent = originalContent.replace(
           `This is the hot AMP page.`,
           'replaced it!'
@@ -456,6 +450,7 @@ describe('AMP Usage', () => {
 
         await check(() => getBrowserBodyText(browser), /I'm an AMP page!/)
       } finally {
+        writeFileSync(hmrTestPagePath, originalContent, 'utf8')
         await browser.close()
       }
     })

test/integration/build-output/test/index.test.js

@@ -144,7 +144,7 @@ describe('Build Output', () => {
           const webpackSizeValue = webpackSize.endsWith('kB')
             ? parseFloat(webpackSize)
             : parseFloat(webpackSize) / 1000
-          expect(webpackSizeValue).toBeCloseTo(gz ? 0.76 : 1.45, 2)
+          expect(webpackSizeValue).toBeCloseTo(gz ? 0.766 : 1.46, 2)
           expect(webpackSize.endsWith('kB') || webpackSize.endsWith(' B')).toBe(
             true
           )

test/integration/worker-webpack5/lib/sharedCode.js

@@ -0,0 +1,17 @@
+export function Expensive() {
+  const start = performance.now()
+  let i = 99999
+
+  const bigArray = []
+  while (--i) {
+    bigArray.push(i)
+  }
+
+  const endTime = performance.now()
+
+  if (typeof window === 'undefined') {
+    console.log('[WORKER] Completed expensive function in', endTime - start)
+  } else {
+    console.log('[WEB] Completed expensive function in', endTime - start)
+  }
+}

test/integration/worker-webpack5/lib/worker.js

@@ -0,0 +1,8 @@
+import { Expensive } from './sharedCode'
+import faker from 'faker'
+
+// Ensure a large libraries is added so that splitChunks would trigger if enabled.
+console.log(faker)
+
+Expensive()
+self.postMessage(true)

test/integration/worker-webpack5/next.config.js

@@ -0,0 +1 @@
+module.exports = {}

test/integration/worker-webpack5/pages/index.js

@@ -0,0 +1,38 @@
+import * as React from 'react'
+import { Expensive } from '../lib/sharedCode'
+
+export default function Home() {
+  const [expensiveWebStatus, setExpensiveWebStatus] = React.useState('WAIT')
+  const [expensiveWorkerStatus, setExpensiveWorkerComplete] = React.useState(
+    'WAIT'
+  )
+  const worker = React.useRef()
+
+  React.useEffect(() => {
+    worker.current = new Worker(new URL('../lib/worker.js', import.meta.url))
+    worker.current.addEventListener('message', ({ data }) => {
+      if (data) {
+        setExpensiveWorkerComplete('PASS')
+      }
+    })
+    worker.current.addEventListener('error', (data) => {
+      setExpensiveWorkerComplete('FAIL')
+    })
+  }, [worker, setExpensiveWorkerComplete])
+  React.useEffect(() => {
+    try {
+      Expensive()
+      setExpensiveWebStatus('PASS')
+    } catch {
+      setExpensiveWebStatus('FAIL')
+    }
+  }, [])
+
+  return (
+    <main>
+      <h1>$RefreshRegistry repro</h1>
+      <div id="web-status">Web: {expensiveWebStatus}</div>
+      <div id="worker-status">Worker: {expensiveWorkerStatus}</div>
+    </main>
+  )
+}

test/integration/worker-webpack5/test/index.test.js

@@ -0,0 +1,58 @@
+/* eslint-env jest */
+import {
+  check,
+  findPort,
+  killApp,
+  launchApp,
+  nextStart,
+  nextBuild,
+} from 'next-test-utils'
+import webdriver from 'next-webdriver'
+import { join } from 'path'
+
+const appDir = join(__dirname, '../')
+
+jest.setTimeout(1000 * 60 * 2)
+
+let appPort
+let app
+
+const runTests = () => {
+  it('should pass on both client and worker', async () => {
+    let browser
+    try {
+      browser = await webdriver(appPort, '/')
+      await browser.waitForElementByCss('#web-status')
+      await check(() => browser.elementByCss('#web-status').text(), /PASS/i)
+      await browser.waitForElementByCss('#worker-status')
+      await check(() => browser.elementByCss('#worker-status').text(), /PASS/i)
+    } finally {
+      if (browser) {
+        await browser.close()
+      }
+    }
+  })
+}
+
+describe('Web Workers with webpack 5', () => {
+  describe('dev mode', () => {
+    beforeAll(async () => {
+      appPort = await findPort()
+      app = await launchApp(appDir, appPort)
+    })
+    afterAll(() => killApp(app))
+
+    runTests()
+  })
+
+  describe('server mode', () => {
+    beforeAll(async () => {
+      await nextBuild(appDir)
+      appPort = await findPort()
+      app = await nextStart(appDir, appPort)
+    })
+    afterAll(() => killApp(app))
+
+    runTests()
+  })
+})

yarn.lock

@@ -8488,6 +8488,11 @@ extsprintf@^1.2.0:
   version "1.4.0"
   resolved "https://registry.yarnpkg.com/extsprintf/-/extsprintf-1.4.0.tgz#e2689f8f356fad62cca65a3a91c5df5f9551692f"
 
+faker@5.5.3:
+  version "5.5.3"
+  resolved "https://registry.yarnpkg.com/faker/-/faker-5.5.3.tgz#c57974ee484431b25205c2c8dc09fda861e51e0e"
+  integrity sha512-wLTv2a28wjUyWkbnX7u/ABZBkUkIF2fCd73V6P2oFqEGEktDfzWx4UxrSqtPRw0xPRAcjeAOIiJWqZm3pP4u3g==
+
 fast-deep-equal@^3.1.1:
   version "3.1.1"
   resolved "https://registry.yarnpkg.com/fast-deep-equal/-/fast-deep-equal-3.1.1.tgz#545145077c501491e33b15ec408c294376e94ae4"