forked from vercel/next.js
/
webpack-config.ts
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/
webpack-config.ts
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import ReactRefreshWebpackPlugin from '@next/react-refresh-utils/ReactRefreshWebpackPlugin'
import chalk from 'chalk'
import crypto from 'crypto'
import { readFileSync } from 'fs'
import { codeFrameColumns } from 'next/dist/compiled/babel/code-frame'
import semver from 'next/dist/compiled/semver'
import { isWebpack5, webpack } from 'next/dist/compiled/webpack/webpack'
import path, { join as pathJoin, relative as relativePath } from 'path'
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 { CustomRoutes } from '../lib/load-custom-routes.js'
import { getTypeScriptConfiguration } from '../lib/typescript/getTypeScriptConfiguration'
import {
CLIENT_STATIC_FILES_RUNTIME_AMP,
CLIENT_STATIC_FILES_RUNTIME_MAIN,
CLIENT_STATIC_FILES_RUNTIME_POLYFILLS_SYMBOL,
CLIENT_STATIC_FILES_RUNTIME_REACT_REFRESH,
CLIENT_STATIC_FILES_RUNTIME_WEBPACK,
REACT_LOADABLE_MANIFEST,
SERVERLESS_DIRECTORY,
SERVER_DIRECTORY,
} from '../shared/lib/constants'
import { execOnce } from '../shared/lib/utils'
import { NextConfigComplete } from '../server/config-shared'
import { WebpackEntrypoints } from './entries'
import * as Log from './output/log'
import { build as buildConfiguration } from './webpack/config'
import { __overrideCssConfiguration } from './webpack/config/blocks/css/overrideCssConfiguration'
import BuildManifestPlugin from './webpack/plugins/build-manifest-plugin'
import BuildStatsPlugin from './webpack/plugins/build-stats-plugin'
import ChunkNamesPlugin from './webpack/plugins/chunk-names-plugin'
import { JsConfigPathsPlugin } from './webpack/plugins/jsconfig-paths-plugin'
import { DropClientPage } from './webpack/plugins/next-drop-client-page-plugin'
import { TraceEntryPointsPlugin } from './webpack/plugins/next-trace-entrypoints-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 { regexLikeCss } from './webpack/config/blocks/css'
import { CopyFilePlugin } from './webpack/plugins/copy-file-plugin'
import type { Span } from '../telemetry/trace'
type ExcludesFalse = <T>(x: T | false) => x is T
const devtoolRevertWarning = execOnce(
(devtool: webpack.Configuration['devtool']) => {
console.warn(
chalk.yellow.bold('Warning: ') +
chalk.bold(`Reverting webpack devtool to '${devtool}'.\n`) +
'Changing the webpack devtool in development mode will cause severe performance regressions.\n' +
'Read more: https://nextjs.org/docs/messages/improper-devtool'
)
}
)
function parseJsonFile(filePath: string) {
const JSON5 = require('next/dist/compiled/json5')
const contents = readFileSync(filePath, 'utf8')
// Special case an empty file
if (contents.trim() === '') {
return {}
}
try {
return JSON5.parse(contents)
} catch (err) {
const codeFrame = codeFrameColumns(
String(contents),
{ start: { line: err.lineNumber, column: err.columnNumber } },
{ message: err.message, highlightCode: true }
)
throw new Error(`Failed to parse "${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' : ''
}`
)
}
}
const WEBPACK_RESOLVE_OPTIONS = {
// This always uses commonjs resolving, assuming API is identical
// between ESM and CJS in a package
// Otherwise combined ESM+CJS packages will never be external
// as resolving mismatch would lead to opt-out from being external.
dependencyType: 'commonjs',
symlinks: true,
}
const WEBPACK_ESM_RESOLVE_OPTIONS = {
dependencyType: 'esm',
symlinks: true,
}
const NODE_RESOLVE_OPTIONS = {
dependencyType: 'commonjs',
modules: ['node_modules'],
alias: false,
fallback: false,
exportsFields: ['exports'],
importsFields: ['imports'],
conditionNames: ['node', 'require', 'module'],
descriptionFiles: ['package.json'],
extensions: ['.js', '.json', '.node'],
enforceExtensions: false,
symlinks: true,
mainFields: ['main'],
mainFiles: ['index'],
roots: [],
fullySpecified: false,
preferRelative: false,
preferAbsolute: false,
restrictions: [],
}
const NODE_ESM_RESOLVE_OPTIONS = {
...NODE_RESOLVE_OPTIONS,
dependencyType: 'esm',
conditionNames: ['node', 'import', 'module'],
fullySpecified: true,
}
export default async function getBaseWebpackConfig(
dir: string,
{
buildId,
config,
dev = false,
isServer = false,
pagesDir,
target = 'server',
reactProductionProfiling = false,
entrypoints,
rewrites,
isDevFallback = false,
runWebpackSpan,
}: {
buildId: string
config: NextConfigComplete
dev?: boolean
isServer?: boolean
pagesDir: string
target?: string
reactProductionProfiling?: boolean
entrypoints: WebpackEntrypoints
rewrites: CustomRoutes['rewrites']
isDevFallback?: boolean
runWebpackSpan?: Span
}
): Promise<webpack.Configuration> {
const hasRewrites =
rewrites.beforeFiles.length > 0 ||
rewrites.afterFiles.length > 0 ||
rewrites.fallback.length > 0
const hasReactRefresh: boolean = dev && !isServer
const reactDomVersion = await getPackageVersion({
cwd: dir,
name: 'react-dom',
})
const hasReact18: boolean =
Boolean(reactDomVersion) &&
(semver.gte(reactDomVersion!, '18.0.0') ||
semver.coerce(reactDomVersion)?.version === '18.0.0')
const hasReactPrerelease =
Boolean(reactDomVersion) && semver.prerelease(reactDomVersion!) != null
const hasReactRoot: boolean = config.experimental.reactRoot || hasReact18
// Only inform during one of the builds
if (!isServer) {
if (hasReactRoot) {
Log.info('Using the createRoot API for React')
}
if (hasReactPrerelease) {
Log.warn(
`You are using an unsupported prerelease of 'react-dom' which may cause ` +
`unexpected or broken application behavior. Continue at your own risk.`
)
}
}
const babelConfigFile = await [
'.babelrc',
'.babelrc.json',
'.babelrc.js',
'.babelrc.mjs',
'.babelrc.cjs',
'babel.config.js',
'babel.config.json',
'babel.config.mjs',
'babel.config.cjs',
].reduce(async (memo: Promise<string | undefined>, filename) => {
const configFilePath = path.join(dir, filename)
return (
(await memo) ||
((await fileExists(configFilePath)) ? configFilePath : undefined)
)
}, Promise.resolve(undefined))
const distDir = path.join(dir, config.distDir)
// Webpack 5 can use the faster babel loader, webpack 5 has built-in caching for loaders
// For webpack 4 the old loader is used as it has external caching
const babelLoader = isWebpack5
? require.resolve('./babel/loader/index')
: 'next-babel-loader'
const useSWCLoader = config.experimental.swcLoader && isWebpack5
if (useSWCLoader && babelConfigFile) {
Log.warn(
`experimental.swcLoader enabled. The custom Babel configuration will not be used.`
)
}
const defaultLoaders = {
babel: useSWCLoader
? {
loader: 'next-swc-loader',
options: {
isServer,
},
}
: {
loader: babelLoader,
options: {
configFile: babelConfigFile,
isServer,
distDir,
pagesDir,
cwd: dir,
// Webpack 5 has a built-in loader cache
cache: !isWebpack5,
development: dev,
hasReactRefresh,
hasJsxRuntime: true,
},
},
// Backwards compat
hotSelfAccept: {
loader: 'noop-loader',
},
}
const babelIncludeRegexes: RegExp[] = [
/next[\\/]dist[\\/]shared[\\/]lib/,
/next[\\/]dist[\\/]client/,
/next[\\/]dist[\\/]pages/,
/[\\/](strip-ansi|ansi-regex)[\\/]/,
]
// 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': [],
...(dev
? {
[CLIENT_STATIC_FILES_RUNTIME_REACT_REFRESH]: require.resolve(
`@next/react-refresh-utils/runtime`
),
[CLIENT_STATIC_FILES_RUNTIME_AMP]:
`./` +
relativePath(
dir,
pathJoin(NEXT_PROJECT_ROOT_DIST_CLIENT, 'dev', 'amp-dev')
).replace(/\\/g, '/'),
}
: {}),
[CLIENT_STATIC_FILES_RUNTIME_MAIN]:
`./` +
path
.relative(
dir,
path.join(
NEXT_PROJECT_ROOT_DIST_CLIENT,
dev ? `next-dev.js` : 'next.js'
)
)
.replace(/\\/g, '/'),
} 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, true)
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$': 'react-dom/profiling',
'scheduler/tracing': 'scheduler/tracing-profiling',
}
}
}
// tell webpack where to look for _app and _document
// using aliases to allow falling back to the default
// version when removed or not present
const clientResolveRewrites = require.resolve(
'../shared/lib/router/utils/resolve-rewrites'
)
const clientResolveRewritesNoop = require.resolve(
'../shared/lib/router/utils/resolve-rewrites-noop'
)
const customAppAliases: { [key: string]: string[] } = {}
const customErrorAlias: { [key: string]: string[] } = {}
const customDocumentAliases: { [key: string]: string[] } = {}
if (dev && isWebpack5) {
customAppAliases[`${PAGES_DIR_ALIAS}/_app`] = [
...config.pageExtensions.reduce((prev, ext) => {
prev.push(path.join(pagesDir, `_app.${ext}`))
return prev
}, [] as string[]),
'next/dist/pages/_app.js',
]
customAppAliases[`${PAGES_DIR_ALIAS}/_error`] = [
...config.pageExtensions.reduce((prev, ext) => {
prev.push(path.join(pagesDir, `_error.${ext}`))
return prev
}, [] as string[]),
'next/dist/pages/_error.js',
]
customDocumentAliases[`${PAGES_DIR_ALIAS}/_document`] = [
...config.pageExtensions.reduce((prev, ext) => {
prev.push(path.join(pagesDir, `_document.${ext}`))
return prev
}, [] as string[]),
'next/dist/pages/_document.js',
]
}
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,
...customAppAliases,
...customErrorAlias,
...customDocumentAliases,
[PAGES_DIR_ALIAS]: pagesDir,
[DOT_NEXT_ALIAS]: distDir,
...getOptimizedAliases(isServer),
...getReactProfilingInProduction(),
[clientResolveRewrites]: hasRewrites
? clientResolveRewrites
: // With webpack 5 an alias can be pointed to false to noop
isWebpack5
? false
: clientResolveRewritesNoop,
},
...(isWebpack5 && !isServer
? {
// Full list of old polyfills is accessible here:
// https://github.com/webpack/webpack/blob/2a0536cf510768111a3a6dceeb14cb79b9f59273/lib/ModuleNotFoundError.js#L13-L42
fallback: {
assert: require.resolve('assert/'),
buffer: require.resolve('buffer/'),
constants: require.resolve('constants-browserify'),
crypto: require.resolve('crypto-browserify'),
domain: require.resolve('domain-browser'),
http: require.resolve('stream-http'),
https: require.resolve('https-browserify'),
os: require.resolve('os-browserify/browser'),
path: require.resolve('path-browserify'),
punycode: require.resolve('punycode'),
process: require.resolve('process/browser'),
// Handled in separate alias
querystring: require.resolve('querystring-es3'),
stream: require.resolve('stream-browserify'),
string_decoder: require.resolve('string_decoder'),
sys: require.resolve('util/'),
timers: require.resolve('timers-browserify'),
tty: require.resolve('tty-browserify'),
// Handled in separate alias
// url: require.resolve('url/'),
util: require.resolve('util/'),
vm: require.resolve('vm-browserify'),
zlib: require.resolve('browserify-zlib'),
},
}
: undefined),
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 | false
} = {
dev: {
cacheGroups: {
default: false,
vendors: false,
},
},
prodGranular: {
// Keep main and _app chunks unsplitted in webpack 5
// as we don't need a separate vendor chunk from that
// and all other chunk depend on them so there is no
// duplication that need to be pulled out.
chunks: isWebpack5
? (chunk) => !/^(polyfills|main|pages\/_app)$/.test(chunk.name)
: 'all',
cacheGroups: {
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
nameForCondition: Function
}): boolean {
return (
module.size() > 160000 &&
/node_modules[/\\]/.test(module.nameForCondition() || '')
)
},
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,
},
...(isWebpack5
? undefined
: {
default: false,
vendors: false,
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 | false
if (dev) {
splitChunksConfig = isWebpack5 ? false : splitChunksConfigs.dev
} else {
splitChunksConfig = splitChunksConfigs.prodGranular
}
const crossOrigin = config.crossOrigin
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
)
const esmExternals = !!config.experimental?.esmExternals
const looseEsmExternals = config.experimental?.esmExternals === 'loose'
async function handleExternals(
context: string,
request: string,
dependencyType: string,
getResolve: (
options: any
) => (
resolveContext: string,
resolveRequest: string
) => Promise<[string | null, boolean]>
) {
// 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))
// 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) {
if (/^(?:next$|react(?:$|\/))/.test(request)) {
return `commonjs ${request}`
}
const notExternalModules =
/^(?:private-next-pages\/|next\/(?:dist\/pages\/|(?:app|document|link|image|constants|dynamic)$)|string-hash$)/
if (notExternalModules.test(request)) {
return
}
}
// When in esm externals mode, and using import, we resolve with
// ESM resolving options.
const isEsmRequested = dependencyType === 'esm'
const preferEsm = esmExternals && isEsmRequested
const resolve = getResolve(
preferEsm ? WEBPACK_ESM_RESOLVE_OPTIONS : WEBPACK_RESOLVE_OPTIONS
)
// Resolve the import with the webpack provided context, this
// ensures we're resolving the correct version when multiple
// exist.
let res: string | null
let isEsm: boolean = false
try {
;[res, isEsm] = await resolve(context, request)
} catch (err) {
res = null
}
// If resolving fails, and we can use an alternative way
// try the alternative resolving options.
if (!res && (isEsmRequested || looseEsmExternals)) {
const resolveAlternative = getResolve(
preferEsm ? WEBPACK_RESOLVE_OPTIONS : WEBPACK_ESM_RESOLVE_OPTIONS
)
try {
;[res, isEsm] = await resolveAlternative(context, request)
} catch (err) {
res = null
}
}
// If the request cannot be resolved we need to have
// webpack "bundle" it so it surfaces the not found error.
if (!res) {
return
}
// ESM externals can only be imported (and not required).
// Make an exception in loose mode.
if (!isEsmRequested && isEsm && !looseEsmExternals) {
throw new Error(
`ESM packages (${request}) need to be imported. Use 'import' to reference the package instead. https://nextjs.org/docs/messages/import-esm-externals`
)
}
if (isLocal) {
// Makes sure dist/shared and dist/server are not bundled
// we need to process shared `router/router` and `dynamic`,
// so that the DefinePlugin can inject process.env values
const isNextExternal =
/next[/\\]dist[/\\](shared|server)[/\\](?!lib[/\\](router[/\\]router|dynamic))/.test(
res
)
if (isNextExternal) {
// Generate Next.js external import
const externalRequest = path.posix.join(
'next',
'dist',
path
.relative(
// Root of Next.js package:
path.join(__dirname, '..'),
res
)
// Windows path normalization
.replace(/\\/g, '/')
)
return `commonjs ${externalRequest}`
} else {
return
}
}
// Bundled Node.js code is relocated without its node_modules tree.
// This means we need to make sure its request resolves to the same
// package that'll be available at runtime. If it's not identical,
// we need to bundle the code (even if it _should_ be external).
let baseRes: string | null
let baseIsEsm: boolean
try {
const baseResolve = getResolve(
isEsm ? NODE_ESM_RESOLVE_OPTIONS : NODE_RESOLVE_OPTIONS
)
;[baseRes, baseIsEsm] = await baseResolve(dir, request)
} catch (err) {
baseRes = null
baseIsEsm = false
}
// Same as above: if the package, when required from the root,
// would be different from what the real resolution would use, we
// cannot externalize it.
// if request is pointing to a symlink it could point to the the same file,
// the resolver will resolve symlinks so this is handled
if (baseRes !== res || isEsm !== baseIsEsm) {
return
}
const externalType = isEsm ? 'module' : 'commonjs'
if (
res.match(/next[/\\]dist[/\\]shared[/\\](?!lib[/\\]router[/\\]router)/)
) {
return `${externalType} ${request}`
}
// Default pages have to be transpiled
if (
res.match(/[/\\]next[/\\]dist[/\\]/) ||
// This is the @babel/plugin-transform-runtime "helpers: true" option
res.match(/node_modules[/\\]@babel[/\\]runtime[/\\]/)
) {
return
}
// Webpack itself has to be compiled because it doesn't always use module relative paths
if (
res.match(/node_modules[/\\]webpack/) ||
res.match(/node_modules[/\\]css-loader/)
) {
return
}
// Anything else that is standard JavaScript within `node_modules`
// can be externalized.
if (/node_modules[/\\].*\.c?js$/.test(res)) {
return `${externalType} ${request}`
}
// Default behavior: bundle the code!
}
const emacsLockfilePattern = '**/.#*'
let webpackConfig: webpack.Configuration = {
parallelism: Number(process.env.NEXT_WEBPACK_PARALLELISM) || undefined,
externals: !isServer
? // make sure importing "next" is handled gracefully for client
// bundles in case a user imported types and it wasn't removed
// TODO: should we warn/error for this instead?
['next']
: !isServerless
? [
isWebpack5
? ({
context,
request,
dependencyType,
getResolve,
}: {
context: string
request: string
dependencyType: string
getResolve: (
options: any
) => (
resolveContext: string,
resolveRequest: string,
callback: (
err?: Error,
result?: string,
resolveData?: { descriptionFileData?: { type?: any } }
) => void
) => void
}) =>
handleExternals(context, request, dependencyType, (options) => {
const resolveFunction = getResolve(options)
return (resolveContext: string, requestToResolve: string) =>
new Promise((resolve, reject) => {
resolveFunction(
resolveContext,
requestToResolve,
(err, result, resolveData) => {
if (err) return reject(err)
if (!result) return resolve([null, false])
const isEsm = /\.js$/i.test(result)
? resolveData?.descriptionFileData?.type ===
'module'
: /\.mjs$/i.test(result)
resolve([result, isEsm])
}
)
})
})
: (
context: string,
request: string,
callback: (err?: Error, result?: string | undefined) => void
) =>
handleExternals(
context,
request,
'commonjs',
() => (resolveContext: string, requestToResolve: string) =>
new Promise((resolve) =>
resolve([
require.resolve(requestToResolve, {
paths: [resolveContext],
}),
false,
])
)
).then((result) => callback(undefined, result), 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
'next/dist/compiled/@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
? isWebpack5 && !dev
? ({
filename: '[name].js',
// allow to split entrypoints
chunks: 'all',
// size of files is not so relevant for server build
// we want to prefer deduplication to load less code
minSize: 1000,
} as any)
: false
: splitChunksConfig,
runtimeChunk: isServer
? isWebpack5 && !isLikeServerless
? { name: 'webpack-runtime' }
: undefined
: { name: CLIENT_STATIC_FILES_RUNTIME_WEBPACK },
minimize: !(dev || isServer),
minimizer: [
// Minify JavaScript
(compiler: webpack.Compiler) => {
// @ts-ignore No typings yet
const {
TerserPlugin,
} = require('./webpack/plugins/terser-webpack-plugin/src/index.js')
new TerserPlugin({
cacheDir: path.join(distDir, 'cache', 'next-minifier'),
parallel: config.experimental.cpus,
swcMinify: config.experimental.swcMinify,