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webpack-config.ts
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webpack-config.ts
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import { codeFrameColumns } from 'next/dist/compiled/babel/code-frame'
import ReactRefreshWebpackPlugin from '@next/react-refresh-utils/ReactRefreshWebpackPlugin'
import crypto from 'crypto'
import { readFileSync, realpathSync } from 'fs'
import chalk from 'chalk'
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 {
DOT_NEXT_ALIAS,
NEXT_PROJECT_ROOT,
NEXT_PROJECT_ROOT_DIST_CLIENT,
PAGES_DIR_ALIAS,
} from '../lib/constants'
import { fileExists } from '../lib/file-exists'
import { getPackageVersion } from '../lib/get-package-version'
import { Rewrite } from '../lib/load-custom-routes'
import { getTypeScriptConfiguration } from '../lib/typescript/getTypeScriptConfiguration'
import {
CLIENT_STATIC_FILES_RUNTIME_MAIN,
CLIENT_STATIC_FILES_RUNTIME_POLYFILLS,
CLIENT_STATIC_FILES_RUNTIME_WEBPACK,
REACT_LOADABLE_MANIFEST,
SERVERLESS_DIRECTORY,
SERVER_DIRECTORY,
} from '../next-server/lib/constants'
import { execOnce } from '../next-server/lib/utils'
import { findPageFile } from '../server/lib/find-page-file'
import { WebpackEntrypoints } from './entries'
import * as Log from './output/log'
import {
collectPlugins,
PluginMetaData,
VALID_MIDDLEWARE,
} from './plugins/collect-plugins'
import { build as buildConfiguration } from './webpack/config'
import { __overrideCssConfiguration } from './webpack/config/blocks/css/overrideCssConfiguration'
import { pluginLoaderOptions } from './webpack/loaders/next-plugin-loader'
import BuildManifestPlugin from './webpack/plugins/build-manifest-plugin'
import ChunkNamesPlugin from './webpack/plugins/chunk-names-plugin'
import { CssMinimizerPlugin } from './webpack/plugins/css-minimizer-plugin'
import { JsConfigPathsPlugin } from './webpack/plugins/jsconfig-paths-plugin'
import { DropClientPage } from './webpack/plugins/next-drop-client-page-plugin'
import NextJsSsrImportPlugin from './webpack/plugins/nextjs-ssr-import'
import NextJsSSRModuleCachePlugin from './webpack/plugins/nextjs-ssr-module-cache'
import PagesManifestPlugin from './webpack/plugins/pages-manifest-plugin'
import { ProfilingPlugin } from './webpack/plugins/profiling-plugin'
import { ReactLoadablePlugin } from './webpack/plugins/react-loadable-plugin'
import { ServerlessPlugin } from './webpack/plugins/serverless-plugin'
import WebpackConformancePlugin, {
DuplicatePolyfillsConformanceCheck,
GranularChunksConformanceCheck,
MinificationConformanceCheck,
ReactSyncScriptsConformanceCheck,
} from './webpack/plugins/webpack-conformance-plugin'
import { WellKnownErrorsPlugin } from './webpack/plugins/wellknown-errors-plugin'
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 '${devtool}'.\n`) +
'Changing the webpack devtool in development mode will cause severe performance regressions.\n' +
'Read more: https://err.sh/next.js/improper-devtool'
)
})
function parseJsonFile(filePath: string) {
const JSON5 = require('next/dist/compiled/json5')
const contents = readFileSync(filePath, 'utf8')
// Special case an empty file
if (contents.trim() === '') {
return {}
}
try {
return JSON5.parse(contents)
} catch (err) {
const codeFrame = codeFrameColumns(
String(contents),
{ start: { line: err.lineNumber, column: err.columnNumber } },
{ message: err.message, highlightCode: true }
)
throw new Error(`Failed to parse "${filePath}":\n${codeFrame}`)
}
}
function getOptimizedAliases(isServer: boolean): { [pkg: string]: string } {
if (isServer) {
return {}
}
const stubWindowFetch = path.join(__dirname, 'polyfills', 'fetch', 'index.js')
const stubObjectAssign = path.join(__dirname, 'polyfills', 'object-assign.js')
const shimAssign = path.join(__dirname, 'polyfills', 'object.assign')
return Object.assign(
{},
{
unfetch$: stubWindowFetch,
'isomorphic-unfetch$': stubWindowFetch,
'whatwg-fetch$': path.join(
__dirname,
'polyfills',
'fetch',
'whatwg-fetch.js'
),
},
{
'object-assign$': stubObjectAssign,
// Stub Package: object.assign
'object.assign/auto': path.join(shimAssign, 'auto.js'),
'object.assign/implementation': path.join(
shimAssign,
'implementation.js'
),
'object.assign$': path.join(shimAssign, 'index.js'),
'object.assign/polyfill': path.join(shimAssign, 'polyfill.js'),
'object.assign/shim': path.join(shimAssign, 'shim.js'),
// Replace: full URL polyfill with platform-based polyfill
url: require.resolve('native-url'),
}
)
}
type ClientEntries = {
[key: string]: string | string[]
}
export function attachReactRefresh(
webpackConfig: webpack.Configuration,
targetLoader: webpack.RuleSetUseItem
) {
let injections = 0
const reactRefreshLoaderName = '@next/react-refresh-utils/loader'
const reactRefreshLoader = require.resolve(reactRefreshLoaderName)
webpackConfig.module?.rules.forEach((rule) => {
const curr = rule.use
// When the user has configured `defaultLoaders.babel` for a input file:
if (curr === targetLoader) {
++injections
rule.use = [reactRefreshLoader, curr as webpack.RuleSetUseItem]
} else if (
Array.isArray(curr) &&
curr.some((r) => r === targetLoader) &&
// Check if loader already exists:
!curr.some(
(r) => r === reactRefreshLoader || r === reactRefreshLoaderName
)
) {
++injections
const idx = curr.findIndex((r) => r === targetLoader)
// Clone to not mutate user input
rule.use = [...curr]
// inject / input: [other, babel] output: [other, refresh, babel]:
rule.use.splice(idx, 0, reactRefreshLoader)
}
})
if (injections) {
Log.info(
`automatically enabled Fast Refresh for ${injections} custom loader${
injections > 1 ? 's' : ''
}`
)
}
}
export default async function getBaseWebpackConfig(
dir: string,
{
buildId,
config,
dev = false,
isServer = false,
pagesDir,
tracer,
target = 'server',
reactProductionProfiling = false,
entrypoints,
rewrites,
}: {
buildId: string
config: NextConfig
dev?: boolean
isServer?: boolean
pagesDir: string
target?: string
tracer?: any
reactProductionProfiling?: boolean
entrypoints: WebpackEntrypoints
rewrites: Rewrite[]
}
): Promise<webpack.Configuration> {
let plugins: PluginMetaData[] = []
let babelPresetPlugins: { dir: string; config: any }[] = []
const hasRewrites = rewrites.length > 0 || dev
if (config.experimental.plugins) {
plugins = await collectPlugins(dir, config.env, config.plugins)
pluginLoaderOptions.plugins = plugins
for (const plugin of plugins) {
if (plugin.middleware.includes('babel-preset-build')) {
babelPresetPlugins.push({
dir: plugin.directory,
config: plugin.config,
})
}
}
}
const reactVersion = await getPackageVersion({ cwd: dir, name: 'react' })
const hasReactRefresh: boolean = dev && !isServer
const hasJsxRuntime: boolean =
Boolean(reactVersion) &&
// 17.0.0-rc.0 had a breaking change not compatible with Next.js, but was
// fixed in rc.1.
semver.gte(reactVersion!, '17.0.0-rc.1')
const distDir = path.join(dir, config.distDir)
const defaultLoaders = {
babel: {
loader: 'next-babel-loader',
options: {
isServer,
distDir,
pagesDir,
cwd: dir,
// Webpack 5 has a built-in loader cache
cache: !isWebpack5,
babelPresetPlugins,
development: dev,
hasReactRefresh,
hasJsxRuntime,
},
},
// Backwards compat
hotSelfAccept: {
loader: 'noop-loader',
},
}
const babelIncludeRegexes: RegExp[] = [
/next[\\/]dist[\\/]next-server[\\/]lib/,
/next[\\/]dist[\\/]client/,
/next[\\/]dist[\\/]pages/,
/[\\/](strip-ansi|ansi-regex)[\\/]/,
...(config.experimental.plugins
? VALID_MIDDLEWARE.map((name) => new RegExp(`src(\\\\|/)${name}`))
: []),
]
// Support for NODE_PATH
const nodePathList = (process.env.NODE_PATH || '')
.split(process.platform === 'win32' ? ';' : ':')
.filter((p) => !!p)
const isServerless = target === 'serverless'
const isServerlessTrace = target === 'experimental-serverless-trace'
// Intentionally not using isTargetLikeServerless helper
const isLikeServerless = isServerless || isServerlessTrace
const outputDir = isLikeServerless ? SERVERLESS_DIRECTORY : SERVER_DIRECTORY
const outputPath = path.join(distDir, isServer ? outputDir : '')
const totalPages = Object.keys(entrypoints).length
const clientEntries = !isServer
? ({
// Backwards compatibility
'main.js': [],
[CLIENT_STATIC_FILES_RUNTIME_MAIN]:
`./` +
path
.relative(
dir,
path.join(
NEXT_PROJECT_ROOT_DIST_CLIENT,
dev ? `next-dev.js` : 'next.js'
)
)
.replace(/\\/g, '/'),
[CLIENT_STATIC_FILES_RUNTIME_POLYFILLS]: path.join(
NEXT_PROJECT_ROOT_DIST_CLIENT,
'polyfills.js'
),
} as ClientEntries)
: undefined
let typeScriptPath: string | undefined
try {
typeScriptPath = require.resolve('typescript', { paths: [dir] })
} catch (_) {}
const tsConfigPath = path.join(dir, 'tsconfig.json')
const useTypeScript = Boolean(
typeScriptPath && (await fileExists(tsConfigPath))
)
let jsConfig
// jsconfig is a subset of tsconfig
if (useTypeScript) {
const ts = (await import(typeScriptPath!)) as typeof import('typescript')
const tsConfig = await getTypeScriptConfiguration(ts, tsConfigPath)
jsConfig = { compilerOptions: tsConfig.options }
}
const jsConfigPath = path.join(dir, 'jsconfig.json')
if (!useTypeScript && (await fileExists(jsConfigPath))) {
jsConfig = parseJsonFile(jsConfigPath)
}
let resolvedBaseUrl
if (jsConfig?.compilerOptions?.baseUrl) {
resolvedBaseUrl = path.resolve(dir, jsConfig.compilerOptions.baseUrl)
}
function getReactProfilingInProduction() {
if (reactProductionProfiling) {
return {
'react-dom$': 'react-dom/profiling',
'scheduler/tracing': 'scheduler/tracing-profiling',
}
}
}
const clientResolveRewrites = require.resolve(
'next/dist/next-server/lib/router/utils/resolve-rewrites'
)
const resolveConfig = {
// Disable .mjs for node_modules bundling
extensions: isServer
? [
'.js',
'.mjs',
...(useTypeScript ? ['.tsx', '.ts'] : []),
'.jsx',
'.json',
'.wasm',
]
: [
'.mjs',
'.js',
...(useTypeScript ? ['.tsx', '.ts'] : []),
'.jsx',
'.json',
'.wasm',
],
modules: [
'node_modules',
...nodePathList, // Support for NODE_PATH environment variable
],
alias: {
next: NEXT_PROJECT_ROOT,
...(isWebpack5 && !isServer
? {
stream: require.resolve('stream-browserify'),
path: require.resolve('path-browserify'),
crypto: require.resolve('crypto-browserify'),
buffer: require.resolve('buffer'),
vm: require.resolve('vm-browserify'),
}
: undefined),
[PAGES_DIR_ALIAS]: pagesDir,
[DOT_NEXT_ALIAS]: distDir,
...getOptimizedAliases(isServer),
...getReactProfilingInProduction(),
[clientResolveRewrites]: hasRewrites
? clientResolveRewrites
: require.resolve('next/dist/client/dev/noop.js'),
},
mainFields: isServer ? ['main', 'module'] : ['browser', 'module', 'main'],
plugins: isWebpack5
? // webpack 5+ has the PnP resolver built-in by default:
[]
: [require('pnp-webpack-plugin')],
}
const terserOptions: any = {
parse: {
ecma: 8,
},
compress: {
ecma: 5,
warnings: false,
// The following two options are known to break valid JavaScript code
comparisons: false,
inline: 2, // https://github.com/vercel/next.js/issues/7178#issuecomment-493048965
},
mangle: { safari10: true },
output: {
ecma: 5,
safari10: true,
comments: false,
// Fixes usage of Emoji and certain Regex
ascii_only: true,
},
}
const isModuleCSS = (module: { type: string }): boolean => {
return (
// mini-css-extract-plugin
module.type === `css/mini-extract` ||
// extract-css-chunks-webpack-plugin (old)
module.type === `css/extract-chunks` ||
// extract-css-chunks-webpack-plugin (new)
module.type === `css/extract-css-chunks`
)
}
// Contains various versions of the Webpack SplitChunksPlugin used in different build types
const splitChunksConfigs: {
[propName: string]: webpack.Options.SplitChunksOptions
} = {
dev: {
cacheGroups: {
default: false,
vendors: false,
// In webpack 5 vendors was renamed to defaultVendors
defaultVendors: false,
},
},
prodGranular: {
chunks: 'all',
cacheGroups: {
default: false,
vendors: false,
// In webpack 5 vendors was renamed to defaultVendors
defaultVendors: false,
framework: {
chunks: 'all',
name: 'framework',
// This regex ignores nested copies of framework libraries so they're
// bundled with their issuer.
// https://github.com/vercel/next.js/pull/9012
test: /(?<!node_modules.*)[\\/]node_modules[\\/](react|react-dom|scheduler|prop-types|use-subscription)[\\/]/,
priority: 40,
// Don't let webpack eliminate this chunk (prevents this chunk from
// becoming a part of the commons chunk)
enforce: true,
},
lib: {
test(module: { size: Function; identifier: Function }): boolean {
return (
module.size() > 160000 &&
/node_modules[/\\]/.test(module.identifier())
)
},
name(module: {
type: string
libIdent?: Function
updateHash: (hash: crypto.Hash) => void
}): string {
const hash = crypto.createHash('sha1')
if (isModuleCSS(module)) {
module.updateHash(hash)
} else {
if (!module.libIdent) {
throw new Error(
`Encountered unknown module type: ${module.type}. Please open an issue.`
)
}
hash.update(module.libIdent({ context: dir }))
}
return hash.digest('hex').substring(0, 8)
},
priority: 30,
minChunks: 1,
reuseExistingChunk: true,
},
commons: {
name: 'commons',
minChunks: totalPages,
priority: 20,
},
shared: {
name(module, chunks) {
return (
crypto
.createHash('sha1')
.update(
chunks.reduce(
(acc: string, chunk: webpack.compilation.Chunk) => {
return acc + chunk.name
},
''
)
)
.digest('hex') + (isModuleCSS(module) ? '_CSS' : '')
)
},
priority: 10,
minChunks: 2,
reuseExistingChunk: true,
},
},
maxInitialRequests: 25,
minSize: 20000,
},
}
// Select appropriate SplitChunksPlugin config for this build
let splitChunksConfig: webpack.Options.SplitChunksOptions
if (dev) {
splitChunksConfig = splitChunksConfigs.dev
} else {
splitChunksConfig = splitChunksConfigs.prodGranular
}
const crossOrigin = config.crossOrigin
let customAppFile: string | null = await findPageFile(
pagesDir,
'/_app',
config.pageExtensions
)
if (customAppFile) {
customAppFile = path.resolve(path.join(pagesDir, customAppFile))
}
const conformanceConfig = Object.assign(
{
ReactSyncScriptsConformanceCheck: {
enabled: true,
},
MinificationConformanceCheck: {
enabled: true,
},
DuplicatePolyfillsConformanceCheck: {
enabled: true,
BlockedAPIToBePolyfilled: Object.assign(
[],
['fetch'],
config.conformance?.DuplicatePolyfillsConformanceCheck
?.BlockedAPIToBePolyfilled || []
),
},
GranularChunksConformanceCheck: {
enabled: true,
},
},
config.conformance
)
function handleExternals(context: any, request: any, callback: any) {
if (request === 'next') {
return callback(undefined, `commonjs ${request}`)
}
const notExternalModules = [
'next/app',
'next/document',
'next/link',
'next/image',
'next/error',
'string-hash',
'next/constants',
]
if (notExternalModules.indexOf(request) !== -1) {
return callback()
}
// We need to externalize internal requests for files intended to
// not be bundled.
const isLocal: boolean =
request.startsWith('.') ||
// Always check for unix-style path, as webpack sometimes
// normalizes as posix.
path.posix.isAbsolute(request) ||
// When on Windows, we also want to check for Windows-specific
// absolute paths.
(process.platform === 'win32' && path.win32.isAbsolute(request))
const isLikelyNextExternal =
isLocal && /[/\\]next-server[/\\]/.test(request)
// Relative requires don't need custom resolution, because they
// are relative to requests we've already resolved here.
// Absolute requires (require('/foo')) are extremely uncommon, but
// also have no need for customization as they're already resolved.
if (isLocal && !isLikelyNextExternal) {
return callback()
}
// Resolve the import with the webpack provided context, this
// ensures we're resolving the correct version when multiple
// exist.
let res: string
try {
res = require.resolve(request, { paths: [context] })
} catch (err) {
// If the request cannot be resolved, we need to tell webpack to
// "bundle" it so that webpack shows an error (that it cannot be
// resolved).
return callback()
}
// Same as above, if the request cannot be resolved we need to have
// webpack "bundle" it so it surfaces the not found error.
if (!res) {
return callback()
}
let isNextExternal: boolean = false
if (isLocal) {
// we need to process next-server/lib/router/router so that
// the DefinePlugin can inject process.env values
isNextExternal = /next[/\\]dist[/\\]next-server[/\\](?!lib[/\\]router[/\\]router)/.test(
res
)
if (!isNextExternal) {
return callback()
}
}
// `isNextExternal` special cases Next.js' internal requires that
// should not be bundled. We need to skip the base resolve routine
// to prevent it from being bundled (assumes Next.js version cannot
// mismatch).
if (!isNextExternal) {
// Bundled Node.js code is relocated without its node_modules tree.
// This means we need to make sure its request resolves to the same
// package that'll be available at runtime. If it's not identical,
// we need to bundle the code (even if it _should_ be external).
let baseRes: string | null
try {
baseRes = require.resolve(request, { paths: [dir] })
} catch (err) {
baseRes = null
}
// Same as above: if the package, when required from the root,
// would be different from what the real resolution would use, we
// cannot externalize it.
if (
!baseRes ||
(baseRes !== res &&
// if res and baseRes are symlinks they could point to the the same file
realpathSync(baseRes) !== realpathSync(res))
) {
return callback()
}
}
// Default pages have to be transpiled
if (
!res.match(/next[/\\]dist[/\\]next-server[/\\]/) &&
(res.match(/[/\\]next[/\\]dist[/\\]/) ||
// This is the @babel/plugin-transform-runtime "helpers: true" option
res.match(/node_modules[/\\]@babel[/\\]runtime[/\\]/))
) {
return callback()
}
// Webpack itself has to be compiled because it doesn't always use module relative paths
if (
res.match(/node_modules[/\\]webpack/) ||
res.match(/node_modules[/\\]css-loader/)
) {
return callback()
}
// Anything else that is standard JavaScript within `node_modules`
// can be externalized.
if (isNextExternal || res.match(/node_modules[/\\].*\.js$/)) {
const externalRequest = isNextExternal
? // Generate Next.js external import
path.posix.join(
'next',
'dist',
path
.relative(
// Root of Next.js package:
path.join(__dirname, '..'),
res
)
// Windows path normalization
.replace(/\\/g, '/')
)
: request
return callback(undefined, `commonjs ${externalRequest}`)
}
// Default behavior: bundle the code!
callback()
}
const emacsLockfilePattern = '**/.#*'
let webpackConfig: webpack.Configuration = {
externals: !isServer
? // make sure importing "next" is handled gracefully for client
// bundles in case a user imported types and it wasn't removed
// TODO: should we warn/error for this instead?
['next']
: !isServerless
? [
isWebpack5
? ({ context, request }, callback) =>
handleExternals(context, request, callback)
: (context, request, callback) =>
handleExternals(context, request, callback),
]
: [
// When the 'serverless' target is used all node_modules will be compiled into the output bundles
// So that the 'serverless' bundles have 0 runtime dependencies
'@ampproject/toolbox-optimizer', // except this one
// Mark this as external if not enabled so it doesn't cause a
// webpack error from being missing
...(config.experimental.optimizeCss ? [] : ['critters']),
],
optimization: {
// Webpack 5 uses a new property for the same functionality
...(isWebpack5 ? { emitOnErrors: !dev } : { noEmitOnErrors: dev }),
checkWasmTypes: false,
nodeEnv: false,
splitChunks: isServer ? false : splitChunksConfig,
runtimeChunk: isServer
? isWebpack5 && !isLikeServerless
? { name: 'webpack-runtime' }
: undefined
: { name: CLIENT_STATIC_FILES_RUNTIME_WEBPACK },
minimize: !(dev || isServer),
minimizer: [
// Minify JavaScript
new TerserPlugin({
cacheDir: path.join(distDir, 'cache', 'next-minifier'),
parallel: config.experimental.cpus,
terserOptions,
}),
// Minify CSS
new CssMinimizerPlugin({
postcssOptions: {
map: {
// `inline: false` generates the source map in a separate file.
// Otherwise, the CSS file is needlessly large.
inline: false,
// `annotation: false` skips appending the `sourceMappingURL`
// to the end of the CSS file. Webpack already handles this.
annotation: false,
},
},
}),
],
},
context: dir,
node: {
setImmediate: false,
},
// Kept as function to be backwards compatible
entry: async () => {
return {
...(clientEntries ? clientEntries : {}),
...entrypoints,
...(isServer
? {
'init-server.js': 'next-plugin-loader?middleware=on-init-server!',
'on-error-server.js':
'next-plugin-loader?middleware=on-error-server!',
}
: {}),
}
},
watchOptions: {
ignored: [
'**/.git/**',
'**/node_modules/**',
'**/.next/**',
// can be removed after https://github.com/paulmillr/chokidar/issues/955 is released
emacsLockfilePattern,
],
},
output: {
...(isWebpack5
? {
environment: {
arrowFunction: false,
bigIntLiteral: false,
const: false,
destructuring: false,
dynamicImport: false,
forOf: false,
module: false,
},
}
: {}),
path: outputPath,
// On the server we don't use the chunkhash
filename: isServer
? '[name].js'
: `static/chunks/[name]${dev ? '' : '-[chunkhash]'}.js`,
library: isServer ? undefined : '_N_E',
libraryTarget: isServer ? 'commonjs2' : 'assign',
hotUpdateChunkFilename: isWebpack5
? 'static/webpack/[id].[fullhash].hot-update.js'
: 'static/webpack/[id].[hash].hot-update.js',
hotUpdateMainFilename: isWebpack5
? 'static/webpack/[fullhash].hot-update.json'
: 'static/webpack/[hash].hot-update.json',
// This saves chunks with the name given via `import()`
chunkFilename: isServer
? `${dev ? '[name]' : '[name].[contenthash]'}.js`
: `static/chunks/${dev ? '[name]' : '[name].[contenthash]'}.js`,
strictModuleExceptionHandling: true,
crossOriginLoading: crossOrigin,
futureEmitAssets: !dev,
webassemblyModuleFilename: 'static/wasm/[modulehash].wasm',
},
performance: false,
resolve: resolveConfig,
resolveLoader: {
// The loaders Next.js provides
alias: [
'emit-file-loader',
'error-loader',
'next-babel-loader',
'next-client-pages-loader',
'next-serverless-loader',
'noop-loader',
'next-plugin-loader',
].reduce((alias, loader) => {
// using multiple aliases to replace `resolveLoader.modules`
alias[loader] = path.join(__dirname, 'webpack', 'loaders', loader)
return alias
}, {} as Record<string, string>),
modules: [
'node_modules',
...nodePathList, // Support for NODE_PATH environment variable
],
plugins: isWebpack5 ? [] : [require('pnp-webpack-plugin')],
},
module: {
rules: [
...(isWebpack5
? [
// TODO: FIXME: do NOT webpack 5 support with this
// x-ref: https://github.com/webpack/webpack/issues/11467
{
test: /\.m?js/,
resolve: {
fullySpecified: false,
},
} as any,
]
: []),
{
test: /\.(tsx|ts|js|mjs|jsx)$/,
include: [dir, ...babelIncludeRegexes],
exclude: (excludePath: string) => {
if (babelIncludeRegexes.some((r) => r.test(excludePath))) {
return false
}
return /node_modules/.test(excludePath)
},
use: config.experimental.babelMultiThread
? [
// Move Babel transpilation into a thread pool (2 workers, unlimited batch size).
// Applying a cache to the off-thread work avoids paying transfer costs for unchanged modules.
{
loader: 'next/dist/compiled/cache-loader',
options: {
cacheContext: dir,
cacheDirectory: path.join(dir, '.next', 'cache', 'webpack'),
cacheIdentifier: `webpack${isServer ? '-server' : ''}`,
},
},
{
loader: require.resolve('next/dist/compiled/thread-loader'),
options: {
workers: 2,
workerParallelJobs: Infinity,
},
},
hasReactRefresh
? require.resolve('@next/react-refresh-utils/loader')
: '',
defaultLoaders.babel,
].filter(Boolean)
: hasReactRefresh
? [
require.resolve('@next/react-refresh-utils/loader'),
defaultLoaders.babel,
]
: defaultLoaders.babel,
},
].filter(Boolean),
},
plugins: [
hasReactRefresh && new ReactRefreshWebpackPlugin(),
// Makes sure `Buffer` is polyfilled in client-side bundles (same behavior as webpack 4)
isWebpack5 &&
!isServer &&
new webpack.ProvidePlugin({ Buffer: ['buffer', 'Buffer'] }),
// Makes sure `process` is polyfilled in client-side bundles (same behavior as webpack 4)
isWebpack5 &&
!isServer &&
new webpack.ProvidePlugin({ process: ['process'] }),
// This plugin makes sure `output.filename` is used for entry chunks
!isWebpack5 && new ChunkNamesPlugin(),
new webpack.DefinePlugin({
...Object.keys(process.env).reduce(
(prev: { [key: string]: string }, key: string) => {
if (key.startsWith('NEXT_PUBLIC_')) {
prev[`process.env.${key}`] = JSON.stringify(process.env[key]!)
}
return prev
},
{}
),
...Object.keys(config.env).reduce((acc, key) => {
if (/^(?:NODE_.+)|^(?:__.+)$/i.test(key)) {
throw new Error(
`The key "${key}" under "env" in next.config.js is not allowed. https://err.sh/vercel/next.js/env-key-not-allowed`
)
}
return {
...acc,
[`process.env.${key}`]: JSON.stringify(config.env[key]),
}
}, {}),
// TODO: enforce `NODE_ENV` on `process.env`, and add a test:
'process.env.NODE_ENV': JSON.stringify(
dev ? 'development' : 'production'
),
'process.env.__NEXT_CROSS_ORIGIN': JSON.stringify(crossOrigin),
'process.browser': JSON.stringify(!isServer),
'process.env.__NEXT_TEST_MODE': JSON.stringify(
process.env.__NEXT_TEST_MODE
),
// This is used in client/dev-error-overlay/hot-dev-client.js to replace the dist directory
...(dev && !isServer
? {
'process.env.__NEXT_DIST_DIR': JSON.stringify(distDir),
}
: {}),
'process.env.__NEXT_TRAILING_SLASH': JSON.stringify(
config.trailingSlash
),
'process.env.__NEXT_BUILD_INDICATOR': JSON.stringify(
config.devIndicators.buildActivity
),
'process.env.__NEXT_PLUGINS': JSON.stringify(
config.experimental.plugins
),
'process.env.__NEXT_STRICT_MODE': JSON.stringify(
config.reactStrictMode
),
'process.env.__NEXT_REACT_MODE': JSON.stringify(
config.experimental.reactMode
),
'process.env.__NEXT_OPTIMIZE_FONTS': JSON.stringify(
config.experimental.optimizeFonts && !dev
),
'process.env.__NEXT_OPTIMIZE_IMAGES': JSON.stringify(
config.experimental.optimizeImages
),
'process.env.__NEXT_OPTIMIZE_CSS': JSON.stringify(
!!config.experimental.optimizeCss && !dev
),
'process.env.__NEXT_SCROLL_RESTORATION': JSON.stringify(
config.experimental.scrollRestoration
),
'process.env.__NEXT_IMAGE_OPTS': JSON.stringify({
deviceSizes: config.images.deviceSizes,
imageSizes: config.images.imageSizes,
path: config.images.path,
loader: config.images.loader,
...(dev
? {
// pass domains in development to allow validating on the client
domains: config.images.domains,
}
: {}),
}),