feat: webpack inlining with configuration for v4 / v5

.eslintignore

@@ -4,6 +4,7 @@ node_modules
 **/dist/**
 examples/with-typescript-eslint-jest/**
 examples/with-kea/**
+packages/next/bundles/webpack/packages/*.runtime.js
 packages/next/compiled/**/*
 packages/react-refresh-utils/**/*.js
 packages/react-dev-overlay/lib/**

.github/actions/next-stats-action/src/prepare/repo-setup.js

@@ -69,13 +69,17 @@ module.exports = (actionInfo) => {
       for (const pkg of pkgs) {
         const pkgPath = path.join(repoDir, 'packages', pkg)
         const packedPkgPath = path.join(pkgPath, `${pkg}-packed.tgz`)
-        // pack the package with yarn
-        await exec(`cd ${pkgPath} && yarn pack -f ${pkg}-packed.tgz`)
 
         const pkgDataPath = path.join(pkgPath, 'package.json')
         const pkgData = require(pkgDataPath)
         const { name } = pkgData
-        pkgDatas.set(name, { pkgDataPath, pkgData, packedPkgPath })
+        pkgDatas.set(name, {
+          pkgDataPath,
+          pkg,
+          pkgPath,
+          pkgData,
+          packedPkgPath,
+        })
         pkgPaths.set(name, packedPkgPath)
       }
 
@@ -93,6 +97,13 @@ module.exports = (actionInfo) => {
           'utf8'
         )
       }
+
+      // wait to pack packages until after dependency paths have been updated
+      // to the correct versions
+      for (const pkgName of pkgDatas.keys()) {
+        const { pkg, pkgPath } = pkgDatas.get(pkgName)
+        await exec(`cd ${pkgPath} && yarn pack -f ${pkg}-packed.tgz`)
+      }
       return pkgPaths
     },
   }

.github/workflows/build_test_deploy.yml

@@ -160,6 +160,7 @@ jobs:
       NEXT_TELEMETRY_DISABLED: 1
       NEXT_TEST_JOB: 1
       HEADLESS: true
+      NEXT_WEBPACK5: 1
 
     steps:
       - uses: actions/checkout@v2
@@ -170,9 +171,6 @@ jobs:
       - run: git fetch --depth=1 origin +refs/tags/*:refs/tags/*
         if: ${{ steps.docs-change.outputs.DOCS_CHANGE != 'docs-only' }}
 
-      - run: cat package.json | jq '.resolutions.webpack = "^5.11.1"' > package.json.tmp && mv package.json.tmp package.json
-        if: ${{ steps.docs-change.outputs.DOCS_CHANGE != 'docs-only' }}
-
       - run: cat package.json | jq '.resolutions.react = "^17.0.1"' > package.json.tmp && mv package.json.tmp package.json
         if: ${{ steps.docs-change.outputs.DOCS_CHANGE != 'docs-only' }}
 
@@ -185,7 +183,7 @@ jobs:
       - run: yarn list webpack react react-dom
         if: ${{ steps.docs-change.outputs.DOCS_CHANGE != 'docs-only' }}
 
-      - run: xvfb-run node run-tests.js test/integration/{link-ref,production,basic,async-modules,font-optimization,ssr-ctx}/test/index.test.js test/acceptance/*.test.js
+      - run: xvfb-run node run-tests.js test/integration/{link-ref,production,basic,async-modules,ssr-ctx}/test/index.test.js test/acceptance/*.test.js
         if: ${{ steps.docs-change.outputs.DOCS_CHANGE != 'docs-only' }}
 
   testFirefox:

.prettierignore

@@ -2,6 +2,7 @@ node_modules
 **/.next/**
 **/_next/**
 **/dist/**
+packages/next/bundles/webpack/packages/*.runtime.js
 packages/next/compiled/**
 packages/react-refresh-utils/**/*.js
 packages/react-refresh-utils/**/*.d.ts
@@ -14,4 +15,4 @@ packages/next-codemod/transforms/__tests__/**/*
 packages/next-codemod/**/*.js
 packages/next-codemod/**/*.d.ts
 packages/next-env/**/*.d.ts
-test-timings.json
+test-timings.json

.prettierignore_staged

@@ -2,6 +2,7 @@
 **/_next/**
 **/dist/**
 packages/next/compiled/**/*
+packages/next/bundles/webpack/packages/*.runtime.js
 lerna.json
 packages/next-codemod/transforms/__testfixtures__/**/*
 packages/next-codemod/transforms/__tests__/**/*

check-pre-compiled.sh

@@ -1,5 +1,8 @@
 #!/bin/bash
 
+yarn --cwd packages/next/bundles
+cp packages/next/bundles/node_modules/webpack5/lib/hmr/HotModuleReplacement.runtime.js packages/next/bundles/webpack/packages/
+cp packages/next/bundles/node_modules/webpack5/lib/hmr/JavascriptHotModuleReplacement.runtime.js packages/next/bundles/webpack/packages/
 yarn --cwd packages/next ncc-compiled
 
 # Make sure to exit with 1 if there are changes after running ncc-compiled

package.json

@@ -74,7 +74,7 @@
     "eslint": "6.8.0",
     "eslint-plugin-import": "2.20.2",
     "eslint-plugin-jest": "23.13.1",
-    "eslint-plugin-react": "7.18.0",
+    "eslint-plugin-react": "7.19.0",
     "eslint-plugin-react-hooks": "2.3.0",
     "execa": "2.0.3",
     "express": "4.17.0",

packages/next/build/compiler.ts

@@ -1,11 +1,14 @@
-import webpack, { Stats, Configuration } from 'webpack'
+import { webpack } from 'next/dist/compiled/webpack/webpack'
 
 export type CompilerResult = {
   errors: string[]
   warnings: string[]
 }
 
-function generateStats(result: CompilerResult, stat: Stats): CompilerResult {
+function generateStats(
+  result: CompilerResult,
+  stat: webpack.Stats
+): CompilerResult {
   const { errors, warnings } = stat.toJson('errors-warnings')
   if (errors.length > 0) {
     result.errors.push(...errors)
@@ -32,12 +35,15 @@ function closeCompiler(compiler: webpack.Compiler | webpack.MultiCompiler) {
 }
 
 export function runCompiler(
-  config: Configuration | Configuration[]
+  config: webpack.Configuration | webpack.Configuration[]
 ): Promise<CompilerResult> {
   return new Promise((resolve, reject) => {
     const compiler = webpack(config)
     compiler.run(
-      (err: Error, statsOrMultiStats: { stats: Stats[] } | Stats) => {
+      (
+        err: Error,
+        statsOrMultiStats: { stats: webpack.Stats[] } | webpack.Stats
+      ) => {
         closeCompiler(compiler).then(() => {
           if (err) {
             const reason = err?.toString()

packages/next/build/webpack-config.ts

@@ -7,8 +7,11 @@ import semver from 'next/dist/compiled/semver'
 // @ts-ignore No typings yet
 import TerserPlugin from './webpack/plugins/terser-webpack-plugin/src/index.js'
 import path from 'path'
-import webpack from 'webpack'
-import { Configuration } from 'webpack'
+import {
+  webpack,
+  isWebpack5,
+  init as initWebpack,
+} from 'next/dist/compiled/webpack/webpack'
 import {
   DOT_NEXT_ALIAS,
   NEXT_PROJECT_ROOT,
@@ -61,23 +64,16 @@ import { NextConfig } from '../next-server/server/config'
 
 type ExcludesFalse = <T>(x: T | false) => x is T
 
-const isWebpack5 = parseInt(webpack.version!) === 5
-
-if (isWebpack5 && semver.lt(webpack.version!, '5.11.1')) {
-  Log.error(
-    `webpack 5 version must be greater than v5.11.1 to work properly with Next.js, please upgrade to continue!\nSee more info here: https://err.sh/next.js/invalid-webpack-5-version`
-  )
-  process.exit(1)
-}
-
-const devtoolRevertWarning = execOnce((devtool: Configuration['devtool']) => {
-  console.warn(
-    chalk.yellow.bold('Warning: ') +
-      chalk.bold(`Reverting webpack devtool to '${devtool}'.\n`) +
-      'Changing the webpack devtool in development mode will cause severe performance regressions.\n' +
-      'Read more: https://err.sh/next.js/improper-devtool'
-  )
-})
+const devtoolRevertWarning = execOnce(
+  (devtool: webpack.Configuration['devtool']) => {
+    console.warn(
+      chalk.yellow.bold('Warning: ') +
+        chalk.bold(`Reverting webpack devtool to '${devtool}'.\n`) +
+        'Changing the webpack devtool in development mode will cause severe performance regressions.\n' +
+        'Read more: https://err.sh/next.js/improper-devtool'
+    )
+  }
+)
 
 function parseJsonFile(filePath: string) {
   const JSON5 = require('next/dist/compiled/json5')
@@ -208,6 +204,12 @@ export default async function getBaseWebpackConfig(
     rewrites: Rewrite[]
   }
 ): Promise<webpack.Configuration> {
+  initWebpack(
+    config.future?.webpack5 ||
+      (config.future?.webpack5 !== false &&
+        Number(process.env.NEXT_WEBPACK5) > 0)
+  )
+
   let plugins: PluginMetaData[] = []
   let babelPresetPlugins: { dir: string; config: any }[] = []
 
@@ -909,7 +911,7 @@ export default async function getBaseWebpackConfig(
       ].filter(Boolean),
     },
     plugins: [
-      hasReactRefresh && new ReactRefreshWebpackPlugin(),
+      hasReactRefresh && new ReactRefreshWebpackPlugin(webpack),
       // Makes sure `Buffer` and `process` are polyfilled in client-side bundles (same behavior as webpack 4)
       isWebpack5 &&
         !isServer &&

packages/next/build/webpack/config/blocks/base.ts

@@ -1,13 +1,13 @@
 import isWslBoolean from 'next/dist/compiled/is-wsl'
 import curry from 'next/dist/compiled/lodash.curry'
-import { Configuration } from 'webpack'
+import { webpack } from 'next/dist/compiled/webpack/webpack'
 import { ConfigurationContext } from '../utils'
 
 const isWindows = process.platform === 'win32' || isWslBoolean
 
 export const base = curry(function base(
   ctx: ConfigurationContext,
-  config: Configuration
+  config: webpack.Configuration
 ) {
   config.mode = ctx.isDevelopment ? 'development' : 'production'
   config.name = ctx.isServer ? 'server' : 'client'

packages/next/build/webpack/config/blocks/css/index.ts

@@ -1,6 +1,6 @@
 import curry from 'next/dist/compiled/lodash.curry'
 import path from 'path'
-import webpack, { Configuration } from 'webpack'
+import { webpack } from 'next/dist/compiled/webpack/webpack'
 import MiniCssExtractPlugin from '../../../plugins/mini-css-extract-plugin'
 import { loader, plugin } from '../../helpers'
 import { ConfigurationContext, ConfigurationFn, pipe } from '../../utils'
@@ -26,7 +26,7 @@ const regexSassModules = /\.module\.(scss|sass)$/
 
 export const css = curry(async function css(
   ctx: ConfigurationContext,
-  config: Configuration
+  config: webpack.Configuration
 ) {
   const {
     prependData: sassPrependData,
@@ -38,7 +38,7 @@ export const css = curry(async function css(
     // First, process files with `sass-loader`: this inlines content, and
     // compiles away the proprietary syntax.
     {
-      loader: require.resolve('sass-loader'),
+      loader: require.resolve('next/dist/compiled/sass-loader'),
       options: {
         // Source maps are required so that `resolve-url-loader` can locate
         // files original to their source directory.

packages/next/build/webpack/config/blocks/css/loaders/client.ts

@@ -1,4 +1,4 @@
-import webpack from 'webpack'
+import { webpack } from 'next/dist/compiled/webpack/webpack'
 import MiniCssExtractPlugin from '../../../../plugins/mini-css-extract-plugin'
 
 export function getClientStyleLoader({

packages/next/build/webpack/config/blocks/css/loaders/getCssModuleLocalIdent.ts

@@ -1,6 +1,6 @@
 import loaderUtils from 'loader-utils'
 import path from 'path'
-import webpack from 'webpack'
+import { webpack } from 'next/dist/compiled/webpack/webpack'
 
 const regexLikeIndexModule = /(?<!pages[\\/])index\.module\.(scss|sass|css)$/
 

packages/next/build/webpack/config/blocks/css/loaders/global.ts

@@ -1,5 +1,5 @@
 import { AcceptedPlugin } from 'postcss'
-import webpack from 'webpack'
+import { webpack } from 'next/dist/compiled/webpack/webpack'
 import { ConfigurationContext } from '../../../utils'
 import { getClientStyleLoader } from './client'
 import { cssFileResolve } from './file-resolve'

packages/next/build/webpack/config/blocks/css/loaders/modules.ts

@@ -1,5 +1,5 @@
 import { AcceptedPlugin } from 'postcss'
-import webpack from 'webpack'
+import { webpack } from 'next/dist/compiled/webpack/webpack'
 import { ConfigurationContext } from '../../../utils'
 import { getClientStyleLoader } from './client'
 import { cssFileResolve } from './file-resolve'

packages/next/build/webpack/config/blocks/css/overrideCssConfiguration.ts

@@ -1,14 +1,14 @@
-import { Configuration, RuleSetRule } from 'webpack'
+import { webpack } from 'next/dist/compiled/webpack/webpack'
 import { getPostCssPlugins } from './plugins'
 
 export async function __overrideCssConfiguration(
   rootDirectory: string,
   isProduction: boolean,
-  config: Configuration
+  config: webpack.Configuration
 ) {
   const postCssPlugins = await getPostCssPlugins(rootDirectory, isProduction)
 
-  function patch(rule: RuleSetRule) {
+  function patch(rule: webpack.RuleSetRule) {
     if (
       rule.options &&
       typeof rule.options === 'object' &&

packages/next/build/webpack/config/helpers.ts

@@ -1,9 +1,9 @@
 import curry from 'next/dist/compiled/lodash.curry'
-import { Configuration, Plugin, RuleSetRule } from 'webpack'
+import { webpack } from 'next/dist/compiled/webpack/webpack'
 
 export const loader = curry(function loader(
-  rule: RuleSetRule,
-  config: Configuration
+  rule: webpack.RuleSetRule,
+  config: webpack.Configuration
 ) {
   if (!config.module) {
     config.module = { rules: [] }
@@ -22,8 +22,8 @@ export const loader = curry(function loader(
 })
 
 export const unshiftLoader = curry(function unshiftLoader(
-  rule: RuleSetRule,
-  config: Configuration
+  rule: webpack.RuleSetRule,
+  config: webpack.Configuration
 ) {
   if (!config.module) {
     config.module = { rules: [] }
@@ -41,7 +41,10 @@ export const unshiftLoader = curry(function unshiftLoader(
   return config
 })
 
-export const plugin = curry(function plugin(p: Plugin, config: Configuration) {
+export const plugin = curry(function plugin(
+  p: webpack.Plugin,
+  config: webpack.Configuration
+) {
   if (!config.plugins) {
     config.plugins = []
   }

packages/next/build/webpack/config/index.ts

@@ -1,4 +1,4 @@
-import webpack from 'webpack'
+import { webpack } from 'next/dist/compiled/webpack/webpack'
 import { NextConfig } from '../../../next-server/server/config'
 import { base } from './blocks/base'
 import { css } from './blocks/css'

packages/next/build/webpack/config/utils.ts

@@ -1,4 +1,4 @@
-import webpack from 'webpack'
+import { webpack } from 'next/dist/compiled/webpack/webpack'
 import { NextConfig } from '../../../next-server/server/config'
 
 export type ConfigurationContext = {

packages/next/build/webpack/loaders/error-loader.ts

@@ -1,9 +1,9 @@
 import chalk from 'chalk'
 import loaderUtils from 'loader-utils'
 import path from 'path'
-import { loader } from 'webpack'
+import { webpack } from 'next/dist/compiled/webpack/webpack'
 
-const ErrorLoader: loader.Loader = function () {
+const ErrorLoader: webpack.loader.Loader = function () {
   const options = loaderUtils.getOptions(this) || {}
 
   const { reason = 'An unknown error has occurred' } = options

packages/next/build/webpack/loaders/next-plugin-loader.ts

@@ -1,4 +1,4 @@
-import { loader } from 'webpack'
+import { webpack } from 'next/dist/compiled/webpack/webpack'
 import { parse } from 'querystring'
 import { PluginMetaData, getPluginId } from '../../plugins/collect-plugins'
 
@@ -12,7 +12,7 @@ export const pluginLoaderOptions: {
   plugins: [],
 }
 
-const nextPluginLoader: loader.Loader = function () {
+const nextPluginLoader: webpack.loader.Loader = function () {
   const { middleware }: NextPluginLoaderQuery =
     typeof this.query === 'string' ? parse(this.query.substr(1)) : this.query
 

packages/next/build/webpack/loaders/next-serverless-loader/index.ts

@@ -2,7 +2,7 @@ import devalue from 'next/dist/compiled/devalue'
 import escapeRegexp from 'next/dist/compiled/escape-string-regexp'
 import { join } from 'path'
 import { parse } from 'querystring'
-import { loader } from 'webpack'
+import { webpack } from 'next/dist/compiled/webpack/webpack'
 import { API_ROUTE } from '../../../../lib/constants'
 import { isDynamicRoute } from '../../../../next-server/lib/router/utils'
 import { __ApiPreviewProps } from '../../../../next-server/server/api-utils'
@@ -33,7 +33,7 @@ export type ServerlessLoaderQuery = {
   i18n: string
 }
 
-const nextServerlessLoader: loader.Loader = function () {
+const nextServerlessLoader: webpack.loader.Loader = function () {
   const span = tracer.startSpan('next-serverless-loader')
   return traceFn(span, () => {
     const {