next-csrf/example/.next/cache/next-babel-loader/5c577d8eb92c789b1970bbd81e4a9c86.json

CSRF mitigation library for Next.js

{"ast":null,"code":"\"use strict\";\n\nexports.__esModule = true;\nexports.hasBasePath = hasBasePath;\nexports.addBasePath = addBasePath;\nexports.delBasePath = delBasePath;\nexports.isLocalURL = isLocalURL;\nexports.resolveHref = resolveHref;\nexports.markLoadingError = markLoadingError;\nexports.default = void 0;\n\nvar _normalizeTrailingSlash = require(\"../../../client/normalize-trailing-slash\");\n\nvar _denormalizePagePath = require(\"../../server/denormalize-page-path\");\n\nvar _mitt = _interopRequireDefault(require(\"../mitt\"));\n\nvar _utils = require(\"../utils\");\n\nvar _isDynamic = require(\"./utils/is-dynamic\");\n\nvar _parseRelativeUrl = require(\"./utils/parse-relative-url\");\n\nvar _querystring = require(\"./utils/querystring\");\n\nvar _resolveRewrites = _interopRequireDefault(require(\"./utils/resolve-rewrites\"));\n\nvar _routeMatcher = require(\"./utils/route-matcher\");\n\nvar _routeRegex = require(\"./utils/route-regex\");\n\nfunction _interopRequireDefault(obj) {\n  return obj && obj.__esModule ? obj : {\n    default: obj\n  };\n}\n/* global __NEXT_DATA__ */\n// tslint:disable:no-console\n\n\nconst basePath = process.env.__NEXT_ROUTER_BASEPATH || '';\n\nfunction buildCancellationError() {\n  return Object.assign(new Error('Route Cancelled'), {\n    cancelled: true\n  });\n}\n\nfunction hasBasePath(path) {\n  return path === basePath || path.startsWith(basePath + '/');\n}\n\nfunction addBasePath(path) {\n  // we only add the basepath on relative urls\n  return basePath && path.startsWith('/') ? path === '/' ? (0, _normalizeTrailingSlash.normalizePathTrailingSlash)(basePath) : basePath + path : path;\n}\n\nfunction delBasePath(path) {\n  return path.slice(basePath.length) || '/';\n}\n/**\n* Detects whether a given url is routable by the Next.js router (browser only).\n*/\n\n\nfunction isLocalURL(url) {\n  if (url.startsWith('/')) return true;\n\n  try {\n    // absolute urls can be local if they are on the same origin\n    const locationOrigin = (0, _utils.getLocationOrigin)();\n    const resolved = new URL(url, locationOrigin);\n    return resolved.origin === locationOrigin && hasBasePath(resolved.pathname);\n  } catch (_) {\n    return false;\n  }\n}\n/**\n* Resolves a given hyperlink with a certain router state (basePath not included).\n* Preserves absolute urls.\n*/\n\n\nfunction resolveHref(currentPath, href) {\n  // we use a dummy base url for relative urls\n  const base = new URL(currentPath, 'http://n');\n  const urlAsString = typeof href === 'string' ? href : (0, _utils.formatWithValidation)(href);\n\n  try {\n    const finalUrl = new URL(urlAsString, base);\n    finalUrl.pathname = (0, _normalizeTrailingSlash.normalizePathTrailingSlash)(finalUrl.pathname); // if the origin didn't change, it means we received a relative href\n\n    return finalUrl.origin === base.origin ? finalUrl.href.slice(finalUrl.origin.length) : finalUrl.href;\n  } catch (_) {\n    return urlAsString;\n  }\n}\n\nconst PAGE_LOAD_ERROR = Symbol('PAGE_LOAD_ERROR');\n\nfunction markLoadingError(err) {\n  return Object.defineProperty(err, PAGE_LOAD_ERROR, {});\n}\n\nfunction prepareUrlAs(router, url, as) {\n  // If url and as provided as an object representation,\n  // we'll format them into the string version here.\n  return {\n    url: addBasePath(resolveHref(router.pathname, url)),\n    as: as ? addBasePath(resolveHref(router.pathname, as)) : as\n  };\n}\n\nconst manualScrollRestoration = process.env.__NEXT_SCROLL_RESTORATION && false && 'scrollRestoration' in window.history;\n\nfunction fetchRetry(url, attempts) {\n  return fetch(url, {\n    // Cookies are required to be present for Next.js' SSG \"Preview Mode\".\n    // Cookies may also be required for `getServerSideProps`.\n    //\n    // > `fetch` won’t send cookies, unless you set the credentials init\n    // > option.\n    // https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch\n    //\n    // > For maximum browser compatibility when it comes to sending &\n    // > receiving cookies, always supply the `credentials: 'same-origin'`\n    // > option instead of relying on the default.\n    // https://github.com/github/fetch#caveats\n    credentials: 'same-origin'\n  }).then(res => {\n    if (!res.ok) {\n      if (attempts > 1 && res.status >= 500) {\n        return fetchRetry(url, attempts - 1);\n      }\n\n      throw new Error(`Failed to load static props`);\n    }\n\n    return res.json();\n  });\n}\n\nfunction fetchNextData(dataHref, isServerRender) {\n  return fetchRetry(dataHref, isServerRender ? 3 : 1).catch(err => {\n    // We should only trigger a server-side transition if this was caused\n    // on a client-side transition. Otherwise, we'd get into an infinite\n    // loop.\n    if (!isServerRender) {\n      markLoadingError(err);\n    }\n\n    throw err;\n  });\n}\n\nclass Router {\n  /**\n  * Map of all components loaded in `Router`\n  */\n  // Static Data Cache\n  constructor(_pathname, _query, _as, {\n    initialProps,\n    pageLoader,\n    App,\n    wrapApp,\n    Component,\n    initialStyleSheets,\n    err,\n    subscription,\n    isFallback\n  }) {\n    this.route = void 0;\n    this.pathname = void 0;\n    this.query = void 0;\n    this.asPath = void 0;\n    this.basePath = void 0;\n    this.components = void 0;\n    this.sdc = {};\n    this.sub = void 0;\n    this.clc = void 0;\n    this.pageLoader = void 0;\n    this._bps = void 0;\n    this.events = void 0;\n    this._wrapApp = void 0;\n    this.isSsr = void 0;\n    this.isFallback = void 0;\n    this._inFlightRoute = void 0;\n    this._shallow = void 0;\n\n    this.onPopState = e => {\n      const state = e.state;\n\n      if (!state) {\n        // We get state as undefined for two reasons.\n        //  1. With older safari (< 8) and older chrome (< 34)\n        //  2. When the URL changed with #\n        //\n        // In the both cases, we don't need to proceed and change the route.\n        // (as it's already changed)\n        // But we can simply replace the state with the new changes.\n        // Actually, for (1) we don't need to nothing. But it's hard to detect that event.\n        // So, doing the following for (1) does no harm.\n        const {\n          pathname,\n          query\n        } = this;\n        this.changeState('replaceState', (0, _utils.formatWithValidation)({\n          pathname: addBasePath(pathname),\n          query\n        }), (0, _utils.getURL)());\n        return;\n      }\n\n      if (!state.__N) {\n        return;\n      }\n\n      const {\n        url,\n        as,\n        options\n      } = state;\n      const {\n        pathname\n      } = (0, _parseRelativeUrl.parseRelativeUrl)(url); // Make sure we don't re-render on initial load,\n      // can be caused by navigating back from an external site\n\n      if (this.isSsr && as === this.asPath && pathname === this.pathname) {\n        return;\n      } // If the downstream application returns falsy, return.\n      // They will then be responsible for handling the event.\n\n\n      if (this._bps && !this._bps(state)) {\n        return;\n      }\n\n      this.change('replaceState', url, as, Object.assign({}, options, {\n        shallow: options.shallow && this._shallow\n      }));\n    }; // represents the current component key\n\n\n    this.route = (0, _normalizeTrailingSlash.removePathTrailingSlash)(_pathname); // set up the component cache (by route keys)\n\n    this.components = {}; // We should not keep the cache, if there's an error\n    // Otherwise, this cause issues when when going back and\n    // come again to the errored page.\n\n    if (_pathname !== '/_error') {\n      this.components[this.route] = {\n        Component,\n        styleSheets: initialStyleSheets,\n        props: initialProps,\n        err,\n        __N_SSG: initialProps && initialProps.__N_SSG,\n        __N_SSP: initialProps && initialProps.__N_SSP\n      };\n    }\n\n    this.components['/_app'] = {\n      Component: App,\n      styleSheets: [\n        /* /_app does not need its stylesheets managed */\n      ]\n    }; // Backwards compat for Router.router.events\n    // TODO: Should be remove the following major version as it was never documented\n\n    this.events = Router.events;\n    this.pageLoader = pageLoader;\n    this.pathname = _pathname;\n    this.query = _query; // if auto prerendered and dynamic route wait to update asPath\n    // until after mount to prevent hydration mismatch\n\n    this.asPath = // @ts-ignore this is temporarily global (attached to window)\n    (0, _isDynamic.isDynamicRoute)(_pathname) && __NEXT_DATA__.autoExport ? _pathname : _as;\n    this.basePath = basePath;\n    this.sub = subscription;\n    this.clc = null;\n    this._wrapApp = wrapApp; // make sure to ignore extra popState in safari on navigating\n    // back from external site\n\n    this.isSsr = true;\n    this.isFallback = isFallback;\n\n    if (false) {\n      // make sure \"as\" doesn't start with double slashes or else it can\n      // throw an error as it's considered invalid\n      if (_as.substr(0, 2) !== '//') {\n        // in order for `e.state` to work on the `onpopstate` event\n        // we have to register the initial route upon initialization\n        this.changeState('replaceState', (0, _utils.formatWithValidation)({\n          pathname: addBasePath(_pathname),\n          query: _query\n        }), (0, _utils.getURL)());\n      }\n\n      window.addEventListener('popstate', this.onPopState); // enable custom scroll restoration handling when available\n      // otherwise fallback to browser's default handling\n\n      if (process.env.__NEXT_SCROLL_RESTORATION) {\n        if (manualScrollRestoration) {\n          window.history.scrollRestoration = 'manual';\n          let scrollDebounceTimeout;\n\n          const debouncedScrollSave = () => {\n            if (scrollDebounceTimeout) clearTimeout(scrollDebounceTimeout);\n            scrollDebounceTimeout = setTimeout(() => {\n              const {\n                url,\n                as: curAs,\n                options\n              } = history.state;\n              this.changeState('replaceState', url, curAs, Object.assign({}, options, {\n                _N_X: window.scrollX,\n                _N_Y: window.scrollY\n              }));\n            }, 10);\n          };\n\n          window.addEventListener('scroll', debouncedScrollSave);\n        }\n      }\n    }\n  }\n\n  reload() {\n    window.location.reload();\n  }\n  /**\n  * Go back in history\n  */\n\n\n  back() {\n    window.history.back();\n  }\n  /**\n  * Performs a `pushState` with arguments\n  * @param url of the route\n  * @param as masks `url` for the browser\n  * @param options object you can define `shallow` and other options\n  */\n\n\n  push(url, as = url, options = {}) {\n    ;\n    ({\n      url,\n      as\n    } = prepareUrlAs(this, url, as));\n    return this.change('pushState', url, as, options);\n  }\n  /**\n  * Performs a `replaceState` with arguments\n  * @param url of the route\n  * @param as masks `url` for the browser\n  * @param options object you can define `shallow` and other options\n  */\n\n\n  replace(url, as = url, options = {}) {\n    ;\n    ({\n      url,\n      as\n    } = prepareUrlAs(this, url, as));\n    return this.change('replaceState', url, as, options);\n  }\n\n  async change(method, url, as, options) {\n    if (!isLocalURL(url)) {\n      window.location.href = url;\n      return false;\n    }\n\n    if (!options._h) {\n      this.isSsr = false;\n    } // marking route changes as a navigation start entry\n\n\n    if (_utils.ST) {\n      performance.mark('routeChange');\n    }\n\n    if (this._inFlightRoute) {\n      this.abortComponentLoad(this._inFlightRoute);\n    }\n\n    const cleanedAs = hasBasePath(as) ? delBasePath(as) : as;\n    this._inFlightRoute = as; // If the url change is only related to a hash change\n    // We should not proceed. We should only change the state.\n    // WARNING: `_h` is an internal option for handing Next.js client-side\n    // hydration. Your app should _never_ use this property. It may change at\n    // any time without notice.\n\n    if (!options._h && this.onlyAHashChange(cleanedAs)) {\n      this.asPath = cleanedAs;\n      Router.events.emit('hashChangeStart', as); // TODO: do we need the resolved href when only a hash change?\n\n      this.changeState(method, url, as, options);\n      this.scrollToHash(cleanedAs);\n      this.notify(this.components[this.route]);\n      Router.events.emit('hashChangeComplete', as);\n      return true;\n    } // The build manifest needs to be loaded before auto-static dynamic pages\n    // get their query parameters to allow ensuring they can be parsed properly\n    // when rewritten to\n\n\n    const pages = await this.pageLoader.getPageList();\n    const {\n      __rewrites: rewrites\n    } = await this.pageLoader.promisedBuildManifest;\n    let parsed = (0, _parseRelativeUrl.parseRelativeUrl)(url);\n    let {\n      pathname,\n      searchParams\n    } = parsed;\n    parsed = this._resolveHref(parsed, pages);\n\n    if (parsed.pathname !== pathname) {\n      pathname = parsed.pathname;\n      url = (0, _utils.formatWithValidation)(parsed);\n    }\n\n    const query = (0, _querystring.searchParamsToUrlQuery)(searchParams); // url and as should always be prefixed with basePath by this\n    // point by either next/link or router.push/replace so strip the\n    // basePath from the pathname to match the pages dir 1-to-1\n\n    pathname = pathname ? (0, _normalizeTrailingSlash.removePathTrailingSlash)(delBasePath(pathname)) : pathname; // If asked to change the current URL we should reload the current page\n    // (not location.reload() but reload getInitialProps and other Next.js stuffs)\n    // We also need to set the method = replaceState always\n    // as this should not go into the history (That's how browsers work)\n    // We should compare the new asPath to the current asPath, not the url\n\n    if (!this.urlIsNew(cleanedAs)) {\n      method = 'replaceState';\n    }\n\n    const route = (0, _normalizeTrailingSlash.removePathTrailingSlash)(pathname);\n    const {\n      shallow = false\n    } = options; // we need to resolve the as value using rewrites for dynamic SSG\n    // pages to allow building the data URL correctly\n\n    let resolvedAs = as;\n\n    if (process.env.__NEXT_HAS_REWRITES) {\n      resolvedAs = (0, _resolveRewrites.default)(as, pages, basePath, rewrites, query, p => this._resolveHref({\n        pathname: p\n      }, pages).pathname);\n    }\n\n    resolvedAs = delBasePath(resolvedAs);\n\n    if ((0, _isDynamic.isDynamicRoute)(route)) {\n      const {\n        pathname: asPathname\n      } = (0, _parseRelativeUrl.parseRelativeUrl)(resolvedAs);\n      const routeRegex = (0, _routeRegex.getRouteRegex)(route);\n      const routeMatch = (0, _routeMatcher.getRouteMatcher)(routeRegex)(asPathname);\n\n      if (!routeMatch) {\n        const missingParams = Object.keys(routeRegex.groups).filter(param => !query[param]);\n\n        if (missingParams.length > 0) {\n          if (true) {\n            console.warn(`Mismatching \\`as\\` and \\`href\\` failed to manually provide ` + `the params: ${missingParams.join(', ')} in the \\`href\\`'s \\`query\\``);\n          }\n\n          throw new Error(`The provided \\`as\\` value (${asPathname}) is incompatible with the \\`href\\` value (${route}). ` + `Read more: https://err.sh/vercel/next.js/incompatible-href-as`);\n        }\n      } else {\n        // Merge params into `query`, overwriting any specified in search\n        Object.assign(query, routeMatch);\n      }\n    }\n\n    Router.events.emit('routeChangeStart', as);\n\n    try {\n      const routeInfo = await this.getRouteInfo(route, pathname, query, as, shallow);\n      let {\n        error\n      } = routeInfo;\n      Router.events.emit('beforeHistoryChange', as);\n      this.changeState(method, url, as, options);\n\n      if (true) {\n        const appComp = this.components['/_app'].Component;\n        window.next.isPrerendered = appComp.getInitialProps === appComp.origGetInitialProps && !routeInfo.Component.getInitialProps;\n      }\n\n      await this.set(route, pathname, query, cleanedAs, routeInfo).catch(e => {\n        if (e.cancelled) error = error || e;else throw e;\n      });\n\n      if (error) {\n        Router.events.emit('routeChangeError', error, cleanedAs);\n        throw error;\n      }\n\n      if (process.env.__NEXT_SCROLL_RESTORATION) {\n        if (manualScrollRestoration && '_N_X' in options) {\n          window.scrollTo(options._N_X, options._N_Y);\n        }\n      }\n\n      Router.events.emit('routeChangeComplete', as);\n      return true;\n    } catch (err) {\n      if (err.cancelled) {\n        return false;\n      }\n\n      throw err;\n    }\n  }\n\n  changeState(method, url, as, options = {}) {\n    if (true) {\n      if (typeof window.history === 'undefined') {\n        console.error(`Warning: window.history is not available.`);\n        return;\n      }\n\n      if (typeof window.history[method] === 'undefined') {\n        console.error(`Warning: window.history.${method} is not available`);\n        return;\n      }\n    }\n\n    if (method !== 'pushState' || (0, _utils.getURL)() !== as) {\n      this._shallow = options.shallow;\n      window.history[method]({\n        url,\n        as,\n        options,\n        __N: true\n      }, // Most browsers currently ignores this parameter, although they may use it in the future.\n      // Passing the empty string here should be safe against future changes to the method.\n      // https://developer.mozilla.org/en-US/docs/Web/API/History/replaceState\n      '', as);\n    }\n  }\n\n  async handleRouteInfoError(err, pathname, query, as, loadErrorFail) {\n    if (err.cancelled) {\n      // bubble up cancellation errors\n      throw err;\n    }\n\n    if (PAGE_LOAD_ERROR in err || loadErrorFail) {\n      Router.events.emit('routeChangeError', err, as); // If we can't load the page it could be one of following reasons\n      //  1. Page doesn't exists\n      //  2. Page does exist in a different zone\n      //  3. Internal error while loading the page\n      // So, doing a hard reload is the proper way to deal with this.\n\n      window.location.href = as; // Changing the URL doesn't block executing the current code path.\n      // So let's throw a cancellation error stop the routing logic.\n\n      throw buildCancellationError();\n    }\n\n    try {\n      const {\n        page: Component,\n        styleSheets\n      } = await this.fetchComponent('/_error');\n      const routeInfo = {\n        Component,\n        styleSheets,\n        err,\n        error: err\n      };\n\n      try {\n        routeInfo.props = await this.getInitialProps(Component, {\n          err,\n          pathname,\n          query\n        });\n      } catch (gipErr) {\n        console.error('Error in error page `getInitialProps`: ', gipErr);\n        routeInfo.props = {};\n      }\n\n      return routeInfo;\n    } catch (routeInfoErr) {\n      return this.handleRouteInfoError(routeInfoErr, pathname, query, as, true);\n    }\n  }\n\n  async getRouteInfo(route, pathname, query, as, shallow = false) {\n    try {\n      const cachedRouteInfo = this.components[route];\n\n      if (shallow && cachedRouteInfo && this.route === route) {\n        return cachedRouteInfo;\n      }\n\n      const routeInfo = cachedRouteInfo ? cachedRouteInfo : await this.fetchComponent(route).then(res => ({\n        Component: res.page,\n        styleSheets: res.styleSheets,\n        __N_SSG: res.mod.__N_SSG,\n        __N_SSP: res.mod.__N_SSP\n      }));\n      const {\n        Component,\n        __N_SSG,\n        __N_SSP\n      } = routeInfo;\n\n      if (true) {\n        const {\n          isValidElementType\n        } = require('react-is');\n\n        if (!isValidElementType(Component)) {\n          throw new Error(`The default export is not a React Component in page: \"${pathname}\"`);\n        }\n      }\n\n      let dataHref;\n\n      if (__N_SSG || __N_SSP) {\n        dataHref = this.pageLoader.getDataHref((0, _utils.formatWithValidation)({\n          pathname,\n          query\n        }), delBasePath(as), __N_SSG);\n      }\n\n      const props = await this._getData(() => __N_SSG ? this._getStaticData(dataHref) : __N_SSP ? this._getServerData(dataHref) : this.getInitialProps(Component, // we provide AppTree later so this needs to be `any`\n      {\n        pathname,\n        query,\n        asPath: as\n      }));\n      routeInfo.props = props;\n      this.components[route] = routeInfo;\n      return routeInfo;\n    } catch (err) {\n      return this.handleRouteInfoError(err, pathname, query, as);\n    }\n  }\n\n  set(route, pathname, query, as, data) {\n    this.isFallback = false;\n    this.route = route;\n    this.pathname = pathname;\n    this.query = query;\n    this.asPath = as;\n    return this.notify(data);\n  }\n  /**\n  * Callback to execute before replacing router state\n  * @param cb callback to be executed\n  */\n\n\n  beforePopState(cb) {\n    this._bps = cb;\n  }\n\n  onlyAHashChange(as) {\n    if (!this.asPath) return false;\n    const [oldUrlNoHash, oldHash] = this.asPath.split('#');\n    const [newUrlNoHash, newHash] = as.split('#'); // Makes sure we scroll to the provided hash if the url/hash are the same\n\n    if (newHash && oldUrlNoHash === newUrlNoHash && oldHash === newHash) {\n      return true;\n    } // If the urls are change, there's more than a hash change\n\n\n    if (oldUrlNoHash !== newUrlNoHash) {\n      return false;\n    } // If the hash has changed, then it's a hash only change.\n    // This check is necessary to handle both the enter and\n    // leave hash === '' cases. The identity case falls through\n    // and is treated as a next reload.\n\n\n    return oldHash !== newHash;\n  }\n\n  scrollToHash(as) {\n    const [, hash] = as.split('#'); // Scroll to top if the hash is just `#` with no value\n\n    if (hash === '') {\n      window.scrollTo(0, 0);\n      return;\n    } // First we check if the element by id is found\n\n\n    const idEl = document.getElementById(hash);\n\n    if (idEl) {\n      idEl.scrollIntoView();\n      return;\n    } // If there's no element with the id, we check the `name` property\n    // To mirror browsers\n\n\n    const nameEl = document.getElementsByName(hash)[0];\n\n    if (nameEl) {\n      nameEl.scrollIntoView();\n    }\n  }\n\n  urlIsNew(asPath) {\n    return this.asPath !== asPath;\n  }\n\n  _resolveHref(parsedHref, pages) {\n    const {\n      pathname\n    } = parsedHref;\n    const cleanPathname = (0, _denormalizePagePath.denormalizePagePath)(delBasePath(pathname));\n\n    if (cleanPathname === '/404' || cleanPathname === '/_error') {\n      return parsedHref;\n    } // handle resolving href for dynamic routes\n\n\n    if (!pages.includes(cleanPathname)) {\n      // eslint-disable-next-line array-callback-return\n      pages.some(page => {\n        if ((0, _isDynamic.isDynamicRoute)(page) && (0, _routeRegex.getRouteRegex)(page).re.test(cleanPathname)) {\n          parsedHref.pathname = addBasePath(page);\n          return true;\n        }\n      });\n    }\n\n    return parsedHref;\n  }\n  /**\n  * Prefetch page code, you may wait for the data during page rendering.\n  * This feature only works in production!\n  * @param url the href of prefetched page\n  * @param asPath the as path of the prefetched page\n  */\n\n\n  async prefetch(url, asPath = url, options = {}) {\n    let parsed = (0, _parseRelativeUrl.parseRelativeUrl)(url);\n    let {\n      pathname\n    } = parsed;\n    const pages = await this.pageLoader.getPageList();\n    parsed = this._resolveHref(parsed, pages);\n\n    if (parsed.pathname !== pathname) {\n      pathname = parsed.pathname;\n      url = (0, _utils.formatWithValidation)(parsed);\n    } // Prefetch is not supported in development mode because it would trigger on-demand-entries\n\n\n    if (true) {\n      return;\n    }\n\n    const route = (0, _normalizeTrailingSlash.removePathTrailingSlash)(pathname);\n    await Promise.all([this.pageLoader.prefetchData(url, asPath), this.pageLoader[options.priority ? 'loadPage' : 'prefetch'](route)]);\n  }\n\n  async fetchComponent(route) {\n    let cancelled = false;\n\n    const cancel = this.clc = () => {\n      cancelled = true;\n    };\n\n    const componentResult = await this.pageLoader.loadPage(route);\n\n    if (cancelled) {\n      const error = new Error(`Abort fetching component for route: \"${route}\"`);\n      error.cancelled = true;\n      throw error;\n    }\n\n    if (cancel === this.clc) {\n      this.clc = null;\n    }\n\n    return componentResult;\n  }\n\n  _getData(fn) {\n    let cancelled = false;\n\n    const cancel = () => {\n      cancelled = true;\n    };\n\n    this.clc = cancel;\n    return fn().then(data => {\n      if (cancel === this.clc) {\n        this.clc = null;\n      }\n\n      if (cancelled) {\n        const err = new Error('Loading initial props cancelled');\n        err.cancelled = true;\n        throw err;\n      }\n\n      return data;\n    });\n  }\n\n  _getStaticData(dataHref) {\n    const {\n      href: cacheKey\n    } = new URL(dataHref, window.location.href);\n\n    if (false && this.sdc[cacheKey]) {\n      return Promise.resolve(this.sdc[cacheKey]);\n    }\n\n    return fetchNextData(dataHref, this.isSsr).then(data => {\n      this.sdc[cacheKey] = data;\n      return data;\n    });\n  }\n\n  _getServerData(dataHref) {\n    return fetchNextData(dataHref, this.isSsr);\n  }\n\n  getInitialProps(Component, ctx) {\n    const {\n      Component: App\n    } = this.components['/_app'];\n\n    const AppTree = this._wrapApp(App);\n\n    ctx.AppTree = AppTree;\n    return (0, _utils.loadGetInitialProps)(App, {\n      AppTree,\n      Component,\n      router: this,\n      ctx\n    });\n  }\n\n  abortComponentLoad(as) {\n    if (this.clc) {\n      Router.events.emit('routeChangeError', buildCancellationError(), as);\n      this.clc();\n      this.clc = null;\n    }\n  }\n\n  notify(data) {\n    return this.sub(data, this.components['/_app'].Component);\n  }\n\n}\n\nexports.default = Router;\nRouter.events = (0, 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'./utils/route-regex'\n\ninterface TransitionOptions {\n  shallow?: boolean\n}\n\ninterface NextHistoryState {\n  url: string\n  as: string\n  options: TransitionOptions\n}\n\ntype HistoryState = null | { __N: false } | ({ __N: true } & NextHistoryState)\n\nconst basePath = (process.env.__NEXT_ROUTER_BASEPATH as string) || ''\n\nfunction buildCancellationError() {\n  return Object.assign(new Error('Route Cancelled'), {\n    cancelled: true,\n  })\n}\n\nexport function hasBasePath(path: string): boolean {\n  return path === basePath || path.startsWith(basePath + '/')\n}\n\nexport function addBasePath(path: string): string {\n  // we only add the basepath on relative urls\n  return basePath && path.startsWith('/')\n    ? path === '/'\n      ? normalizePathTrailingSlash(basePath)\n      : basePath + path\n    : path\n}\n\nexport function delBasePath(path: string): string {\n  return path.slice(basePath.length) || '/'\n}\n\n/**\n * Detects whether a given url is routable by the Next.js 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