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