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/
build-manifest-plugin.ts
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/
build-manifest-plugin.ts
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import devalue from 'next/dist/compiled/devalue'
import {
webpack,
isWebpack5,
sources,
} from 'next/dist/compiled/webpack/webpack'
import {
BUILD_MANIFEST,
CLIENT_STATIC_FILES_PATH,
CLIENT_STATIC_FILES_RUNTIME_MAIN,
CLIENT_STATIC_FILES_RUNTIME_POLYFILLS_SYMBOL,
CLIENT_STATIC_FILES_RUNTIME_REACT_REFRESH,
CLIENT_STATIC_FILES_RUNTIME_AMP,
} from '../../../shared/lib/constants'
import { BuildManifest } from '../../../server/get-page-files'
import getRouteFromEntrypoint from '../../../server/get-route-from-entrypoint'
import { ampFirstEntryNamesMap } from './next-drop-client-page-plugin'
import { Rewrite } from '../../../lib/load-custom-routes'
import { getSortedRoutes } from '../../../shared/lib/router/utils'
import { spans } from './profiling-plugin'
import { CustomRoutes } from '../../../lib/load-custom-routes'
type DeepMutable<T> = { -readonly [P in keyof T]: DeepMutable<T[P]> }
export type ClientBuildManifest = Record<string, string[]>
// This function takes the asset map generated in BuildManifestPlugin and creates a
// reduced version to send to the client.
function generateClientManifest(
compiler: any,
assetMap: BuildManifest,
rewrites: CustomRoutes['rewrites']
): string {
const compilerSpan = spans.get(compiler)
const genClientManifestSpan = compilerSpan?.traceChild(
'NextJsBuildManifest-generateClientManifest'
)
return genClientManifestSpan?.traceFn(() => {
const clientManifest: ClientBuildManifest = {
// TODO: update manifest type to include rewrites
__rewrites: rewrites as any,
}
const appDependencies = new Set(assetMap.pages['/_app'])
const sortedPageKeys = getSortedRoutes(Object.keys(assetMap.pages))
sortedPageKeys.forEach((page) => {
const dependencies = assetMap.pages[page]
if (page === '/_app') return
// Filter out dependencies in the _app entry, because those will have already
// been loaded by the client prior to a navigation event
const filteredDeps = dependencies.filter(
(dep) => !appDependencies.has(dep)
)
// The manifest can omit the page if it has no requirements
if (filteredDeps.length) {
clientManifest[page] = filteredDeps
}
})
// provide the sorted pages as an array so we don't rely on the object's keys
// being in order and we don't slow down look-up time for page assets
clientManifest.sortedPages = sortedPageKeys
return devalue(clientManifest)
})
}
function getEntrypointFiles(entrypoint: any): string[] {
return (
entrypoint
?.getFiles()
.filter((file: string) => {
// We don't want to include `.hot-update.js` files into the initial page
return /(?<!\.hot-update)\.(js|css)($|\?)/.test(file)
})
.map((file: string) => file.replace(/\\/g, '/')) ?? []
)
}
const processRoute = (r: Rewrite) => {
const rewrite = { ...r }
// omit external rewrite destinations since these aren't
// handled client-side
if (!rewrite.destination.startsWith('/')) {
delete (rewrite as any).destination
}
return rewrite
}
// This plugin creates a build-manifest.json for all assets that are being output
// It has a mapping of "entry" filename to real filename. Because the real filename can be hashed in production
export default class BuildManifestPlugin {
private buildId: string
private rewrites: CustomRoutes['rewrites']
private isDevFallback: boolean
constructor(options: {
buildId: string
rewrites: CustomRoutes['rewrites']
isDevFallback?: boolean
}) {
this.buildId = options.buildId
this.isDevFallback = !!options.isDevFallback
this.rewrites = {
beforeFiles: [],
afterFiles: [],
fallback: [],
}
this.rewrites.beforeFiles = options.rewrites.beforeFiles.map(processRoute)
this.rewrites.afterFiles = options.rewrites.afterFiles.map(processRoute)
this.rewrites.fallback = options.rewrites.fallback.map(processRoute)
}
createAssets(compiler: any, compilation: any, assets: any) {
const compilerSpan = spans.get(compiler)
const createAssetsSpan = compilerSpan?.traceChild(
'NextJsBuildManifest-createassets'
)
return createAssetsSpan?.traceFn(() => {
const entrypoints: Map<string, any> = compilation.entrypoints
const assetMap: DeepMutable<BuildManifest> = {
polyfillFiles: [],
devFiles: [],
ampDevFiles: [],
lowPriorityFiles: [],
pages: { '/_app': [] },
ampFirstPages: [],
}
const ampFirstEntryNames = ampFirstEntryNamesMap.get(compilation)
if (ampFirstEntryNames) {
for (const entryName of ampFirstEntryNames) {
const pagePath = getRouteFromEntrypoint(entryName)
if (!pagePath) {
continue
}
assetMap.ampFirstPages.push(pagePath)
}
}
const mainFiles = new Set(
getEntrypointFiles(entrypoints.get(CLIENT_STATIC_FILES_RUNTIME_MAIN))
)
const compilationAssets: {
name: string
source: typeof sources.RawSource
info: object
}[] = compilation.getAssets()
assetMap.polyfillFiles = compilationAssets
.filter((p) => {
// Ensure only .js files are passed through
if (!p.name.endsWith('.js')) {
return false
}
return (
p.info && CLIENT_STATIC_FILES_RUNTIME_POLYFILLS_SYMBOL in p.info
)
})
.map((v) => v.name)
assetMap.devFiles = getEntrypointFiles(
entrypoints.get(CLIENT_STATIC_FILES_RUNTIME_REACT_REFRESH)
).filter((file) => !mainFiles.has(file))
assetMap.ampDevFiles = getEntrypointFiles(
entrypoints.get(CLIENT_STATIC_FILES_RUNTIME_AMP)
)
const systemEntrypoints = new Set([
CLIENT_STATIC_FILES_RUNTIME_MAIN,
CLIENT_STATIC_FILES_RUNTIME_REACT_REFRESH,
CLIENT_STATIC_FILES_RUNTIME_AMP,
])
for (const entrypoint of compilation.entrypoints.values()) {
if (systemEntrypoints.has(entrypoint.name)) continue
const pagePath = getRouteFromEntrypoint(entrypoint.name)
if (!pagePath) {
continue
}
const filesForPage = getEntrypointFiles(entrypoint)
assetMap.pages[pagePath] = [...new Set([...mainFiles, ...filesForPage])]
}
if (!this.isDevFallback) {
// Add the runtime build manifest file (generated later in this file)
// as a dependency for the app. If the flag is false, the file won't be
// downloaded by the client.
assetMap.lowPriorityFiles.push(
`${CLIENT_STATIC_FILES_PATH}/${this.buildId}/_buildManifest.js`
)
// Add the runtime ssg manifest file as a lazy-loaded file dependency.
// We also stub this file out for development mode (when it is not
// generated).
const srcEmptySsgManifest = `self.__SSG_MANIFEST=new Set;self.__SSG_MANIFEST_CB&&self.__SSG_MANIFEST_CB()`
const ssgManifestPath = `${CLIENT_STATIC_FILES_PATH}/${this.buildId}/_ssgManifest.js`
assetMap.lowPriorityFiles.push(ssgManifestPath)
assets[ssgManifestPath] = new sources.RawSource(srcEmptySsgManifest)
}
assetMap.pages = Object.keys(assetMap.pages)
.sort()
// eslint-disable-next-line
.reduce((a, c) => ((a[c] = assetMap.pages[c]), a), {} as any)
let buildManifestName = BUILD_MANIFEST
if (this.isDevFallback) {
buildManifestName = `fallback-${BUILD_MANIFEST}`
}
assets[buildManifestName] = new sources.RawSource(
JSON.stringify(assetMap, null, 2)
)
if (!this.isDevFallback) {
const clientManifestPath = `${CLIENT_STATIC_FILES_PATH}/${this.buildId}/_buildManifest.js`
assets[clientManifestPath] = new sources.RawSource(
`self.__BUILD_MANIFEST = ${generateClientManifest(
compiler,
assetMap,
this.rewrites
)};self.__BUILD_MANIFEST_CB && self.__BUILD_MANIFEST_CB()`
)
}
return assets
})
}
apply(compiler: webpack.Compiler) {
if (isWebpack5) {
compiler.hooks.make.tap('NextJsBuildManifest', (compilation) => {
// @ts-ignore TODO: Remove ignore when webpack 5 is stable
compilation.hooks.processAssets.tap(
{
name: 'NextJsBuildManifest',
// @ts-ignore TODO: Remove ignore when webpack 5 is stable
stage: webpack.Compilation.PROCESS_ASSETS_STAGE_ADDITIONS,
},
(assets: any) => {
this.createAssets(compiler, compilation, assets)
}
)
})
return
}
compiler.hooks.emit.tap('NextJsBuildManifest', (compilation: any) => {
this.createAssets(compiler, compilation, compilation.assets)
})
}
}