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Setup success/failure hooks in case the browser synchronously\n // executes when `src` is set.\n script.onload = resolve\n script.onerror = () =>\n reject(markAssetError(new Error(`Failed to load script: ${src}`)))\n\n // 2. Configure the cross-origin attribute before setting `src` in case the\n // browser begins to fetch.\n script.crossOrigin = process.env.__NEXT_CROSS_ORIGIN!\n\n // 3. Finally, set the source and inject into the DOM in case the child\n // must be appended for fetching to start.\n script.src = src\n document.body.appendChild(script)\n })\n}\n\n// Resolve a promise that times out after given amount of milliseconds.\nfunction resolvePromiseWithTimeout<T>(\n p: Promise<T>,\n ms: number,\n err: Error\n): Promise<T> {\n return new Promise((resolve, reject) => {\n let cancelled = false\n\n p.then((r) => {\n // Resolved, cancel the timeout\n cancelled = true\n resolve(r)\n }).catch(reject)\n\n requestIdleCallback(() =>\n setTimeout(() => {\n if (!cancelled) {\n reject(err)\n }\n }, ms)\n )\n })\n}\n\n// TODO: stop exporting or cache the failure\n// It'd be best to stop exporting this. It's an implementation detail. We're\n// only exporting it for backwards compatibilty with the `page-loader`.\n// Only cache this response as a last resort if we cannot eliminate all other\n// code branches that use the Build Manifest Callback and push them through\n// the Route Loader interface.\nexport function getClientBuildManifest(): Promise<ClientBuildManifest> {\n if (self.__BUILD_MANIFEST) {\n return Promise.resolve(self.__BUILD_MANIFEST)\n }\n\n const onBuildManifest: Promise<ClientBuildManifest> = new Promise<\n ClientBuildManifest\n >((resolve) => {\n // Mandatory because this is not concurrent safe:\n const cb = self.__BUILD_MANIFEST_CB\n self.__BUILD_MANIFEST_CB = () => {\n resolve(self.__BUILD_MANIFEST!)\n cb && cb()\n }\n })\n\n return resolvePromiseWithTimeout<ClientBuildManifest>(\n onBuildManifest,\n MS_MAX_IDLE_DELAY,\n markAssetError(new Error('Failed to load client build manifest'))\n )\n}\n\ninterface RouteFiles {\n scripts: string[]\n css: string[]\n}\nfunction getFilesForRoute(\n assetPrefix: string,\n route: string\n): Promise<RouteFiles> {\n if (process.env.NODE_ENV === 'development') {\n return Promise.resolve({\n scripts: [\n assetPrefix +\n '/_next/static/chunks/pages' +\n encodeURI(getAssetPathFromRoute(route, '.js')),\n ],\n // Styles are handled by `style-loader` in development:\n css: [],\n })\n }\n return getClientBuildManifest().then((manifest) => {\n if (!(route in manifest)) {\n throw markAssetError(new Error(`Failed to lookup route: ${route}`))\n }\n const allFiles = manifest[route].map(\n (entry) => assetPrefix + '/_next/' + encodeURI(entry)\n )\n return {\n scripts: allFiles.filter((v) => v.endsWith('.js')),\n css: allFiles.filter((v) => v.endsWith('.css')),\n }\n })\n}\n\nfunction createRouteLoader(assetPrefix: string): RouteLoader {\n const entrypoints: Map<\n string,\n Future<RouteEntrypoint> | RouteEntrypoint\n > = new Map()\n const loadedScripts: Map<string, Promise<unknown>> = new Map()\n const styleSheets: Map<string, Promise<RouteStyleSheet>> = new Map()\n const routes: Map<\n string,\n Future<RouteLoaderEntry> | RouteLoaderEntry\n > = new Map()\n\n function maybeExecuteScript(src: string): Promise<unknown> {\n let prom: Promise<unknown> | undefined = loadedScripts.get(src)\n if (prom) {\n return prom\n }\n\n // Skip executing script if it's already in the DOM:\n if (document.querySelector(`script[src^=\"${src}\"]`)) {\n return Promise.resolve()\n }\n\n loadedScripts.set(src, (prom = appendScript(src)))\n return prom\n }\n\n function fetchStyleSheet(href: string): Promise<RouteStyleSheet> {\n let prom: Promise<RouteStyleSheet> | undefined = styleSheets.get(href)\n if (prom) {\n return prom\n }\n\n styleSheets.set(\n href,\n (prom = fetch(href)\n .then((res) => {\n if (!res.ok) {\n throw new Error(`Failed to load stylesheet: ${href}`)\n }\n return res.text().then((text) => ({ href: href, content: text }))\n })\n .catch((err) => {\n throw markAssetError(err)\n }))\n )\n return prom\n }\n\n return {\n whenEntrypoint(route: string) {\n return withFuture(route, entrypoints)\n },\n onEntrypoint(route: string, execute: () => unknown) {\n Promise.resolve(execute)\n .then((fn) => fn())\n .then(\n (exports: any) => ({\n component: (exports && exports.default) || exports,\n exports: exports,\n }),\n (err) => ({ error: err })\n )\n .then((input: RouteEntrypoint) => {\n const old = entrypoints.get(route)\n entrypoints.set(route, input)\n if (old && 'resolve' in old) old.resolve(input)\n })\n },\n loadRoute(route: string, prefetch?: boolean) {\n return withFuture<RouteLoaderEntry>(route, routes, () => {\n return resolvePromiseWithTimeout(\n getFilesForRoute(assetPrefix, route)\n .then(({ scripts, css }) => {\n return Promise.all([\n entrypoints.has(route)\n ? []\n : Promise.all(scripts.map(maybeExecuteScript)),\n Promise.all(css.map(fetchStyleSheet)),\n ] as const)\n })\n .then((res) => {\n return this.whenEntrypoint(route).then((entrypoint) => ({\n entrypoint,\n styles: res[1],\n }))\n }),\n MS_MAX_IDLE_DELAY,\n markAssetError(new Error(`Route did not complete loading: ${route}`))\n )\n .then(({ entrypoint, styles }) => {\n const res: RouteLoaderEntry = Object.assign<\n { styles: RouteStyleSheet[] },\n RouteEntrypoint\n >({ styles: styles! }, entrypoint)\n return 'error' in entrypoint ? entrypoint : res\n })\n .catch((err) => {\n if (prefetch) {\n // we don't want to cache errors during prefetch\n throw err\n }\n return { error: err }\n })\n })\n },\n prefetch(route: string): Promise<void> {\n // https://github.com/GoogleChromeLabs/quicklink/blob/453a661fa1fa940e2d2e044452398e38c67a98fb/src/index.mjs#L115-L118\n // License: Apache 2.0\n let cn\n if ((cn = (navigator as any).connection)) {\n // Don't prefetch if using 2G or if Save-Data is enabled.\n if (cn.saveData || /2g/.test(cn.effectiveType)) return Promise.resolve()\n }\n return getFilesForRoute(assetPrefix, route)\n .then((output) =>\n Promise.all(\n canPrefetch\n ? output.scripts.map((script) => prefetchViaDom(script, 'script'))\n : []\n )\n )\n .then(() => {\n requestIdleCallback(() => this.loadRoute(route, true).catch(() => {}))\n })\n .catch(\n // swallow prefetch errors\n () => {}\n )\n },\n }\n}\n\nexport default createRouteLoader\n"]} |