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