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{ getOverlayMiddleware } from '@next/react-dev-overlay/lib/middleware'\nimport { NextHandleFunction } from 'connect'\nimport { IncomingMessage, ServerResponse } from 'http'\nimport { WebpackHotMiddleware } from './hot-middleware'\nimport { join } from 'path'\nimport { UrlObject } from 'url'\nimport { webpack, isWebpack5 } from 'next/dist/compiled/webpack/webpack'\nimport { createEntrypoints, createPagesMapping } from '../build/entries'\nimport { watchCompilers } from '../build/output'\nimport getBaseWebpackConfig from '../build/webpack-config'\nimport { API_ROUTE } from '../lib/constants'\nimport { recursiveDelete } from '../lib/recursive-delete'\nimport { BLOCKED_PAGES } from '../next-server/lib/constants'\nimport { __ApiPreviewProps } from '../next-server/server/api-utils'\nimport { route } from '../next-server/server/router'\nimport { findPageFile } from './lib/find-page-file'\nimport onDemandEntryHandler, {\n entries,\n BUILDING,\n} from './on-demand-entry-handler'\nimport {\n denormalizePagePath,\n normalizePathSep,\n} from '../next-server/server/normalize-page-path'\nimport getRouteFromEntrypoint from '../next-server/server/get-route-from-entrypoint'\nimport { isWriteable } from '../build/is-writeable'\nimport { ClientPagesLoaderOptions } from '../build/webpack/loaders/next-client-pages-loader'\nimport { stringify } from 'querystring'\nimport { difference } from '../build/utils'\nimport { NextConfig } from '../next-server/server/config'\nimport { CustomRoutes } from '../lib/load-custom-routes'\n\nexport async function renderScriptError(\n res: ServerResponse,\n error: Error,\n { verbose = true } = {}\n) {\n // Asks CDNs and others to not to cache the errored page\n res.setHeader(\n 'Cache-Control',\n 'no-cache, no-store, max-age=0, must-revalidate'\n )\n\n if ((error as any).code === 'ENOENT') {\n res.statusCode = 404\n res.end('404 - Not Found')\n return\n }\n\n if (verbose) {\n console.error(error.stack)\n }\n res.statusCode = 500\n res.end('500 - Internal Error')\n}\n\nfunction addCorsSupport(req: IncomingMessage, res: ServerResponse) {\n const isApiRoute = req.url!.match(API_ROUTE)\n // API routes handle their own CORS headers\n if (isApiRoute) {\n return { preflight: false }\n }\n\n if (!req.headers.origin) {\n return { preflight: false }\n }\n\n res.setHeader('Access-Control-Allow-Origin', req.headers.origin)\n res.setHeader('Access-Control-Allow-Methods', 'OPTIONS, GET')\n // Based on https://github.com/primus/access-control/blob/4cf1bc0e54b086c91e6aa44fb14966fa5ef7549c/index.js#L158\n if (req.headers['access-control-request-headers']) {\n res.setHeader(\n 'Access-Control-Allow-Headers',\n req.headers['access-control-request-headers'] as string\n )\n }\n\n if (req.method === 'OPTIONS') {\n res.writeHead(200)\n res.end()\n return { preflight: true }\n }\n\n return { preflight: false }\n}\n\nconst matchNextPageBundleRequest = route(\n '/_next/static/chunks/pages/:path*.js(\\\\.map|)'\n)\n\n// Recursively look up the issuer till it ends up at the root\nfunction findEntryModule(issuer: any): any {\n if (issuer.issuer) {\n return findEntryModule(issuer.issuer)\n }\n\n return issuer\n}\n\nfunction erroredPages(compilation: webpack.compilation.Compilation) {\n const failedPages: { [page: string]: any[] } = {}\n for (const error of compilation.errors) {\n if (!error.origin) {\n continue\n }\n\n const entryModule = findEntryModule(error.origin)\n const { name } = entryModule\n if (!name) {\n continue\n }\n\n // Only pages have to be reloaded\n const enhancedName = getRouteFromEntrypoint(name)\n\n if (!enhancedName) {\n continue\n }\n\n if (!failedPages[enhancedName]) {\n failedPages[enhancedName] = []\n }\n\n failedPages[enhancedName].push(error)\n }\n\n return failedPages\n}\n\nexport default class HotReloader {\n private dir: string\n private buildId: string\n private middlewares: any[]\n private pagesDir: string\n private webpackHotMiddleware: (NextHandleFunction & any) | null\n private config: NextConfig\n private stats: webpack.Stats | null\n private serverStats: webpack.Stats | null\n private clientError: Error | null = null\n private serverError: Error | null = null\n private serverPrevDocumentHash: string | null\n private prevChunkNames?: Set<any>\n private onDemandEntries: any\n private previewProps: __ApiPreviewProps\n private watcher: any\n private rewrites: CustomRoutes['rewrites']\n private fallbackWatcher: any\n public isWebpack5: any\n\n constructor(\n dir: string,\n {\n config,\n pagesDir,\n buildId,\n previewProps,\n rewrites,\n }: {\n config: NextConfig\n pagesDir: string\n buildId: string\n previewProps: __ApiPreviewProps\n rewrites: CustomRoutes['rewrites']\n }\n ) {\n this.buildId = buildId\n this.dir = dir\n this.middlewares = []\n this.pagesDir = pagesDir\n this.webpackHotMiddleware = null\n this.stats = null\n this.serverStats = null\n this.serverPrevDocumentHash = null\n\n this.config = config\n this.previewProps = previewProps\n this.rewrites = rewrites\n this.isWebpack5 = isWebpack5\n }\n\n public async run(\n req: IncomingMessage,\n res: ServerResponse,\n parsedUrl: UrlObject\n ): Promise<{ finished?: true }> {\n // Usually CORS support is not needed for the hot-reloader (this is dev only feature)\n // With when the app runs for multi-zones support behind a proxy,\n // the current page is trying to access this URL via assetPrefix.\n // That's when the CORS support is needed.\n const { preflight } = addCorsSupport(req, res)\n if (preflight) {\n return {}\n }\n\n // When a request comes in that is a page bundle, e.g. /_next/static/<buildid>/pages/index.js\n // we have to compile the page using on-demand-entries, this middleware will handle doing that\n // by adding the page to on-demand-entries, waiting till it's done\n // and then the bundle will be served like usual by the actual route in server/index.js\n const handlePageBundleRequest = async (\n pageBundleRes: ServerResponse,\n parsedPageBundleUrl: UrlObject\n ): Promise<{ finished?: true }> => {\n const { pathname } = parsedPageBundleUrl\n const params: { path: string[] } | null = matchNextPageBundleRequest(\n pathname\n )\n if (!params) {\n return {}\n }\n\n let decodedPagePath: string\n\n try {\n decodedPagePath = `/${params.path\n .map((param) => decodeURIComponent(param))\n .join('/')}`\n } catch (_) {\n const err: Error & { code?: string } = new Error(\n 'failed to decode param'\n )\n err.code = 'DECODE_FAILED'\n throw err\n }\n\n const page = denormalizePagePath(decodedPagePath)\n\n if (page === '/_error' || BLOCKED_PAGES.indexOf(page) === -1) {\n try {\n await this.ensurePage(page)\n } catch (error) {\n await renderScriptError(pageBundleRes, error)\n return { finished: true }\n }\n\n const errors = await this.getCompilationErrors(page)\n if (errors.length > 0) {\n await renderScriptError(pageBundleRes, errors[0], { verbose: false })\n return { finished: true }\n }\n }\n\n return {}\n }\n\n const { finished } = await handlePageBundleRequest(res, parsedUrl)\n\n for (const fn of this.middlewares) {\n await new Promise<void>((resolve, reject) => {\n fn(req, res, (err: Error) => {\n if (err) return reject(err)\n resolve()\n })\n })\n }\n\n return { finished }\n }\n\n private async clean(): Promise<void> {\n return recursiveDelete(join(this.dir, this.config.distDir), /^cache/)\n }\n\n private async getWebpackConfig() {\n const pagePaths = await Promise.all([\n findPageFile(this.pagesDir, '/_app', this.config.pageExtensions),\n findPageFile(this.pagesDir, '/_document', this.config.pageExtensions),\n ])\n\n const pages = createPagesMapping(\n pagePaths.filter((i) => i !== null) as string[],\n this.config.pageExtensions\n )\n const entrypoints = createEntrypoints(\n pages,\n 'server',\n this.buildId,\n this.previewProps,\n this.config,\n []\n )\n\n return Promise.all([\n getBaseWebpackConfig(this.dir, {\n dev: true,\n isServer: false,\n config: this.config,\n buildId: this.buildId,\n pagesDir: this.pagesDir,\n rewrites: this.rewrites,\n entrypoints: entrypoints.client,\n }),\n getBaseWebpackConfig(this.dir, {\n dev: true,\n isServer: true,\n config: this.config,\n buildId: this.buildId,\n pagesDir: this.pagesDir,\n rewrites: this.rewrites,\n entrypoints: entrypoints.server,\n }),\n ])\n }\n\n public async buildFallbackError(): Promise<void> {\n if (this.fallbackWatcher) return\n\n const fallbackConfig = await getBaseWebpackConfig(this.dir, {\n dev: true,\n isServer: false,\n config: this.config,\n buildId: this.buildId,\n pagesDir: this.pagesDir,\n rewrites: {\n beforeFiles: [],\n afterFiles: [],\n fallback: [],\n },\n isDevFallback: true,\n entrypoints: createEntrypoints(\n {\n '/_app': 'next/dist/pages/_app',\n '/_error': 'next/dist/pages/_error',\n },\n 'server',\n this.buildId,\n this.previewProps,\n this.config,\n []\n ).client,\n })\n const fallbackCompiler = webpack(fallbackConfig)\n\n this.fallbackWatcher = await new Promise((resolve) => {\n let bootedFallbackCompiler = false\n fallbackCompiler.watch(\n // @ts-ignore webpack supports an array of watchOptions when using a multiCompiler\n fallbackConfig.watchOptions,\n // Errors are handled separately\n (_err: any) => {\n if (!bootedFallbackCompiler) {\n bootedFallbackCompiler = true\n resolve(true)\n }\n }\n )\n })\n }\n\n public async start(): Promise<void> {\n await this.clean()\n\n const configs = await this.getWebpackConfig()\n\n for (const config of configs) {\n const defaultEntry = config.entry\n config.entry = async (...args) => {\n // @ts-ignore entry is always a functon\n const entrypoints = await defaultEntry(...args)\n\n const isClientCompilation = config.name === 'client'\n\n await Promise.all(\n Object.keys(entries).map(async (page) => {\n if (isClientCompilation && page.match(API_ROUTE)) {\n return\n }\n const {\n serverBundlePath,\n clientBundlePath,\n absolutePagePath,\n } = entries[page]\n const pageExists = await isWriteable(absolutePagePath)\n if (!pageExists) {\n // page was removed\n delete entries[page]\n return\n }\n\n entries[page].status = BUILDING\n const pageLoaderOpts: ClientPagesLoaderOptions = {\n page,\n absolutePagePath,\n }\n\n entrypoints[\n isClientCompilation ? clientBundlePath : serverBundlePath\n ] = isClientCompilation\n ? `next-client-pages-loader?${stringify(pageLoaderOpts)}!`\n : absolutePagePath\n })\n )\n\n return entrypoints\n }\n }\n\n const multiCompiler = webpack(configs)\n\n watchCompilers(multiCompiler.compilers[0], multiCompiler.compilers[1])\n\n // Watch for changes to client/server page files so we can tell when just\n // the server file changes and trigger a reload for GS(S)P pages\n const changedClientPages = new Set<string>()\n const changedServerPages = new Set<string>()\n const prevClientPageHashes = new Map<string, string>()\n const prevServerPageHashes = new Map<string, string>()\n\n const trackPageChanges = (\n pageHashMap: Map<string, string>,\n changedItems: Set<string>\n ) => (stats: webpack.compilation.Compilation) => {\n stats.entrypoints.forEach((entry, key) => {\n if (key.startsWith('pages/')) {\n entry.chunks.forEach((chunk: any) => {\n if (chunk.id === key) {\n const prevHash = pageHashMap.get(key)\n\n if (prevHash && prevHash !== chunk.hash) {\n changedItems.add(key)\n }\n pageHashMap.set(key, chunk.hash)\n }\n })\n }\n })\n }\n\n multiCompiler.compilers[0].hooks.emit.tap(\n 'NextjsHotReloaderForClient',\n trackPageChanges(prevClientPageHashes, changedClientPages)\n )\n multiCompiler.compilers[1].hooks.emit.tap(\n 'NextjsHotReloaderForServer',\n trackPageChanges(prevServerPageHashes, changedServerPages)\n )\n\n // This plugin watches for changes to _document.js and notifies the client side that it should reload the page\n multiCompiler.compilers[1].hooks.failed.tap(\n 'NextjsHotReloaderForServer',\n (err: Error) => {\n this.serverError = err\n this.serverStats = null\n }\n )\n multiCompiler.compilers[1].hooks.done.tap(\n 'NextjsHotReloaderForServer',\n (stats) => {\n this.serverError = null\n this.serverStats = stats\n\n const serverOnlyChanges = difference<string>(\n changedServerPages,\n changedClientPages\n )\n changedClientPages.clear()\n changedServerPages.clear()\n\n if (serverOnlyChanges.length > 0) {\n this.send({\n event: 'serverOnlyChanges',\n pages: serverOnlyChanges.map((pg) =>\n denormalizePagePath(pg.substr('pages'.length))\n ),\n })\n }\n\n const { compilation } = stats\n\n // We only watch `_document` for changes on the server compilation\n // the rest of the files will be triggered by the client compilation\n const documentChunk = compilation.namedChunks.get('pages/_document')\n // If the document chunk can't be found we do nothing\n if (!documentChunk) {\n console.warn('_document.js chunk not found')\n return\n }\n\n // Initial value\n if (this.serverPrevDocumentHash === null) {\n this.serverPrevDocumentHash = documentChunk.hash\n return\n }\n\n // If _document.js didn't change we don't trigger a reload\n if (documentChunk.hash === this.serverPrevDocumentHash) {\n return\n }\n\n // Notify reload to reload the page, as _document.js was changed (different hash)\n this.send('reloadPage')\n this.serverPrevDocumentHash = documentChunk.hash\n }\n )\n\n multiCompiler.compilers[0].hooks.failed.tap(\n 'NextjsHotReloaderForClient',\n (err: Error) => {\n this.clientError = err\n this.stats = null\n }\n )\n multiCompiler.compilers[0].hooks.done.tap(\n 'NextjsHotReloaderForClient',\n (stats) => {\n this.clientError = null\n this.stats = stats\n\n const { compilation } = stats\n const chunkNames = new Set(\n [...compilation.namedChunks.keys()].filter(\n (name) => !!getRouteFromEntrypoint(name)\n )\n )\n\n if (this.prevChunkNames) {\n // detect chunks which have to be replaced with a new template\n // e.g, pages/index.js <-> pages/_error.js\n const addedPages = diff(chunkNames, this.prevChunkNames!)\n const removedPages = diff(this.prevChunkNames!, chunkNames)\n\n if (addedPages.size > 0) {\n for (const addedPage of addedPages) {\n const page = getRouteFromEntrypoint(addedPage)\n this.send('addedPage', page)\n }\n }\n\n if (removedPages.size > 0) {\n for (const removedPage of removedPages) {\n const page = getRouteFromEntrypoint(removedPage)\n this.send('removedPage', page)\n }\n }\n }\n\n this.prevChunkNames = chunkNames\n }\n )\n\n this.webpackHotMiddleware = new WebpackHotMiddleware(\n multiCompiler.compilers\n )\n\n let booted = false\n\n this.watcher = await new Promise((resolve) => {\n const watcher = multiCompiler.watch(\n // @ts-ignore webpack supports an array of watchOptions when using a multiCompiler\n configs.map((config) => config.watchOptions!),\n // Errors are handled separately\n (_err: any) => {\n if (!booted) {\n booted = true\n resolve(watcher)\n }\n }\n )\n })\n\n this.onDemandEntries = onDemandEntryHandler(this.watcher, multiCompiler, {\n pagesDir: this.pagesDir,\n pageExtensions: this.config.pageExtensions,\n ...(this.config.onDemandEntries as {\n maxInactiveAge: number\n pagesBufferLength: number\n }),\n })\n\n this.middlewares = [\n // must come before hotMiddleware\n this.onDemandEntries.middleware,\n this.webpackHotMiddleware.middleware,\n getOverlayMiddleware({\n isWebpack5,\n rootDirectory: this.dir,\n stats: () => this.stats,\n serverStats: () => this.serverStats,\n }),\n ]\n }\n\n public async stop(): Promise<void> {\n await new Promise((resolve, reject) => {\n this.watcher.close((err: any) => (err ? reject(err) : resolve(true)))\n })\n\n if (this.fallbackWatcher) {\n await new Promise((resolve, reject) => {\n this.fallbackWatcher.close((err: any) =>\n err ? reject(err) : resolve(true)\n )\n })\n }\n }\n\n public async getCompilationErrors(page: string) {\n const normalizedPage = normalizePathSep(page)\n\n if (this.clientError || this.serverError) {\n return [this.clientError || this.serverError]\n } else if (this.stats?.hasErrors()) {\n const { compilation } = this.stats\n const failedPages = erroredPages(compilation)\n\n // If there is an error related to the requesting page we display it instead of the first error\n if (\n failedPages[normalizedPage] &&\n failedPages[normalizedPage].length > 0\n ) {\n return failedPages[normalizedPage]\n }\n\n // If none were found we still have to show the other errors\n return this.stats.compilation.errors\n } else if (this.serverStats?.hasErrors()) {\n const { compilation } = this.serverStats\n const failedPages = erroredPages(compilation)\n\n // If there is an error related to the requesting page we display it instead of the first error\n if (\n failedPages[normalizedPage] &&\n failedPages[normalizedPage].length > 0\n ) {\n return failedPages[normalizedPage]\n }\n\n // If none were found we still have to show the other errors\n return this.serverStats.compilation.errors\n }\n\n return []\n }\n\n public send(action?: string | any, ...args: any[]): void {\n this.webpackHotMiddleware!.publish(\n action && typeof action === 'object' ? action : { action, data: args }\n )\n }\n\n public async ensurePage(page: string) {\n // Make sure we don't re-build or dispose prebuilt pages\n if (page !== '/_error' && BLOCKED_PAGES.indexOf(page) !== -1) {\n return\n }\n if (this.serverError || this.clientError) {\n return Promise.reject(this.serverError || this.clientError)\n }\n return this.onDemandEntries.ensurePage(page)\n }\n}\n\nfunction diff(a: Set<any>, b: Set<any>) {\n return new Set([...a].filter((v) => !b.has(v)))\n}\n"]} |