forked from vercel/next.js
/
page-loader.ts
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/
page-loader.ts
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import type { ComponentType } from 'react'
import type { RouteLoader } from './route-loader'
import {
addBasePath,
addLocale,
interpolateAs,
} from '../shared/lib/router/router'
import getAssetPathFromRoute from '../shared/lib/router/utils/get-asset-path-from-route'
import { isDynamicRoute } from '../shared/lib/router/utils/is-dynamic'
import { parseRelativeUrl } from '../shared/lib/router/utils/parse-relative-url'
import { removePathTrailingSlash } from './normalize-trailing-slash'
import {
createRouteLoader,
getClientBuildManifest,
getMiddlewareManifest,
} from './route-loader'
function normalizeRoute(route: string): string {
if (route[0] !== '/') {
throw new Error(`Route name should start with a "/", got "${route}"`)
}
if (route === '/') return route
return route.replace(/\/$/, '')
}
declare global {
interface Window {
__DEV_MIDDLEWARE_MANIFEST?: [location: string, isSSR: boolean][]
__DEV_PAGES_MANIFEST?: { pages: string[] }
__SSG_MANIFEST_CB?: () => void
__SSG_MANIFEST?: Set<string>
}
}
export type StyleSheetTuple = { href: string; text: string }
export type GoodPageCache = {
page: ComponentType
mod: any
styleSheets: StyleSheetTuple[]
}
export default class PageLoader {
private buildId: string
private assetPrefix: string
private promisedSsgManifest: Promise<Set<string>>
private promisedDevPagesManifest?: Promise<string[]>
private promisedMiddlewareManifest?: Promise<
[location: string, isSSR: boolean][]
>
public routeLoader: RouteLoader
constructor(buildId: string, assetPrefix: string) {
this.routeLoader = createRouteLoader(assetPrefix)
this.buildId = buildId
this.assetPrefix = assetPrefix
this.promisedSsgManifest = new Promise((resolve) => {
if (window.__SSG_MANIFEST) {
resolve(window.__SSG_MANIFEST)
} else {
window.__SSG_MANIFEST_CB = () => {
resolve(window.__SSG_MANIFEST!)
}
}
})
}
getPageList() {
if (process.env.NODE_ENV === 'production') {
return getClientBuildManifest().then((manifest) => manifest.sortedPages)
} else {
if (window.__DEV_PAGES_MANIFEST) {
return window.__DEV_PAGES_MANIFEST.pages
} else {
if (!this.promisedDevPagesManifest) {
// TODO: Decide what should happen when fetching fails instead of asserting
// @ts-ignore
this.promisedDevPagesManifest = fetch(
`${this.assetPrefix}/_next/static/development/_devPagesManifest.json`
)
.then((res) => res.json())
.then((manifest: { pages: string[] }) => {
window.__DEV_PAGES_MANIFEST = manifest
return manifest.pages
})
.catch((err) => {
console.log(`Failed to fetch devPagesManifest`, err)
})
}
// TODO Remove this assertion as this could be undefined
return this.promisedDevPagesManifest!
}
}
}
getMiddlewareList() {
if (process.env.NODE_ENV === 'production') {
return getMiddlewareManifest()
} else {
if (window.__DEV_MIDDLEWARE_MANIFEST) {
return window.__DEV_MIDDLEWARE_MANIFEST
} else {
if (!this.promisedMiddlewareManifest) {
// TODO: Decide what should happen when fetching fails instead of asserting
// @ts-ignore
this.promisedMiddlewareManifest = fetch(
`${this.assetPrefix}/_next/static/${this.buildId}/_devMiddlewareManifest.json`
)
.then((res) => res.json())
.then((manifest: [location: string, isSSR: boolean][]) => {
window.__DEV_MIDDLEWARE_MANIFEST = manifest
return manifest
})
.catch((err) => {
console.log(`Failed to fetch _devMiddlewareManifest`, err)
})
}
// TODO Remove this assertion as this could be undefined
return this.promisedMiddlewareManifest!
}
}
}
/**
* @param {string} href the route href (file-system path)
* @param {string} asPath the URL as shown in browser (virtual path); used for dynamic routes
* @returns {string}
*/
getDataHref({
href,
asPath,
ssg,
flight,
locale,
}: {
href: string
asPath: string
ssg?: boolean
flight?: boolean
locale?: string | false
}): string {
const { pathname: hrefPathname, query, search } = parseRelativeUrl(href)
const { pathname: asPathname } = parseRelativeUrl(asPath)
const route = normalizeRoute(hrefPathname)
const getHrefForSlug = (path: string) => {
if (flight) {
return path + search + (search ? `&` : '?') + '__flight__=1'
}
const dataRoute = getAssetPathFromRoute(
removePathTrailingSlash(addLocale(path, locale)),
'.json'
)
return addBasePath(
`/_next/data/${this.buildId}${dataRoute}${ssg ? '' : search}`
)
}
const isDynamic: boolean = isDynamicRoute(route)
const interpolatedRoute = isDynamic
? interpolateAs(hrefPathname, asPathname, query).result
: ''
return isDynamic
? interpolatedRoute && getHrefForSlug(interpolatedRoute)
: getHrefForSlug(route)
}
/**
* @param {string} route - the route (file-system path)
*/
_isSsg(route: string): Promise<boolean> {
return this.promisedSsgManifest.then((manifest) => manifest.has(route))
}
loadPage(route: string): Promise<GoodPageCache> {
return this.routeLoader.loadRoute(route).then((res) => {
if ('component' in res) {
return {
page: res.component,
mod: res.exports,
styleSheets: res.styles.map((o) => ({
href: o.href,
text: o.content,
})),
}
}
throw res.error
})
}
prefetch(route: string): Promise<void> {
return this.routeLoader.prefetch(route)
}
}