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app-index.tsx
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app-index.tsx
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/* global location */
import '../build/polyfills/polyfill-module'
// @ts-ignore react-dom/client exists when using React 18
import ReactDOMClient from 'react-dom/client'
// @ts-ignore startTransition exists when using React 18
import React from 'react'
import { createFromReadableStream } from 'next/dist/compiled/react-server-dom-webpack'
/// <reference types="react-dom/experimental" />
// Override chunk URL mapping in the webpack runtime
// https://github.com/webpack/webpack/blob/2738eebc7880835d88c727d364ad37f3ec557593/lib/RuntimeGlobals.js#L204
declare global {
const __webpack_require__: any
}
// eslint-disable-next-line no-undef
const getChunkScriptFilename = __webpack_require__.u
const chunkFilenameMap: any = {}
// eslint-disable-next-line no-undef
__webpack_require__.u = (chunkId: any) => {
return chunkFilenameMap[chunkId] || getChunkScriptFilename(chunkId)
}
// Ignore the module ID transform in client.
// eslint-disable-next-line no-undef
// @ts-expect-error TODO: fix type
self.__next_require__ = __webpack_require__
// eslint-disable-next-line no-undef
;(self as any).__next_chunk_load__ = (chunk: string) => {
if (chunk.endsWith('.css')) {
const existingTag = document.querySelector(`link[href="${chunk}"]`)
if (!existingTag) {
const link = document.createElement('link')
link.rel = 'stylesheet'
link.href = '/_next/' + chunk
document.head.appendChild(link)
}
return Promise.resolve()
}
const [chunkId, chunkFileName] = chunk.split(':')
chunkFilenameMap[chunkId] = `static/chunks/${chunkFileName}.js`
// @ts-ignore
// eslint-disable-next-line no-undef
return __webpack_chunk_load__(chunkId)
}
export const version = process.env.__NEXT_VERSION
const appElement: HTMLElement | Document | null = document
let reactRoot: any = null
function renderReactElement(
domEl: HTMLElement | Document,
fn: () => JSX.Element
): void {
const reactEl = fn()
if (!reactRoot) {
// Unlike with createRoot, you don't need a separate root.render() call here
reactRoot = (ReactDOMClient as any).hydrateRoot(domEl, reactEl)
} else {
reactRoot.render(reactEl)
}
}
const getCacheKey = () => {
const { pathname, search } = location
return pathname + search
}
const encoder = new TextEncoder()
let initialServerDataBuffer: string[] | undefined = undefined
let initialServerDataWriter: ReadableStreamDefaultController | undefined =
undefined
let initialServerDataLoaded = false
let initialServerDataFlushed = false
function nextServerDataCallback(seg: [number, string, string]) {
if (seg[0] === 0) {
initialServerDataBuffer = []
} else {
if (!initialServerDataBuffer)
throw new Error('Unexpected server data: missing bootstrap script.')
if (initialServerDataWriter) {
initialServerDataWriter.enqueue(encoder.encode(seg[2]))
} else {
initialServerDataBuffer.push(seg[2])
}
}
}
// There might be race conditions between `nextServerDataRegisterWriter` and
// `DOMContentLoaded`. The former will be called when React starts to hydrate
// the root, the latter will be called when the DOM is fully loaded.
// For streaming, the former is called first due to partial hydration.
// For non-streaming, the latter can be called first.
// Hence, we use two variables `initialServerDataLoaded` and
// `initialServerDataFlushed` to make sure the writer will be closed and
// `initialServerDataBuffer` will be cleared in the right time.
function nextServerDataRegisterWriter(ctr: ReadableStreamDefaultController) {
if (initialServerDataBuffer) {
initialServerDataBuffer.forEach((val) => {
ctr.enqueue(encoder.encode(val))
})
if (initialServerDataLoaded && !initialServerDataFlushed) {
ctr.close()
initialServerDataFlushed = true
initialServerDataBuffer = undefined
}
}
initialServerDataWriter = ctr
}
// When `DOMContentLoaded`, we can close all pending writers to finish hydration.
const DOMContentLoaded = function () {
if (initialServerDataWriter && !initialServerDataFlushed) {
initialServerDataWriter.close()
initialServerDataFlushed = true
initialServerDataBuffer = undefined
}
initialServerDataLoaded = true
}
// It's possible that the DOM is already loaded.
if (document.readyState === 'loading') {
document.addEventListener('DOMContentLoaded', DOMContentLoaded, false)
} else {
DOMContentLoaded()
}
const nextServerDataLoadingGlobal = ((self as any).__next_s =
(self as any).__next_s || [])
nextServerDataLoadingGlobal.forEach(nextServerDataCallback)
nextServerDataLoadingGlobal.push = nextServerDataCallback
function createResponseCache() {
return new Map<string, any>()
}
const rscCache = createResponseCache()
function useInitialServerResponse(cacheKey: string) {
const response = rscCache.get(cacheKey)
if (response) return response
const readable = new ReadableStream({
start(controller) {
nextServerDataRegisterWriter(controller)
},
})
async function loadCss(cssChunkInfoJson: string) {
const data = JSON.parse(cssChunkInfoJson)
await Promise.all(
data.chunks.map((chunkId: string) => {
// load css related chunks
return (self as any).__next_chunk_load__(chunkId)
})
)
// In development mode, import css in dev when it's wrapped by style loader.
// In production mode, css are standalone chunk that doesn't need to be imported.
if (data.id) {
;(self as any).__next_require__(data.id)
}
}
const loadCssFromStreamData = (data: string) => {
if (data.startsWith('CSS:')) {
loadCss(data.slice(4).trim())
}
}
// TODO-APP: Refine the buffering code here to make it more correct.
let buffer = ''
const loadCssFromFlight = new TransformStream({
transform(chunk, controller) {
const data = new TextDecoder().decode(chunk)
buffer += data
let index
while ((index = buffer.indexOf('\n')) !== -1) {
const line = buffer.slice(0, index + 1)
buffer = buffer.slice(index + 1)
if (line.startsWith('CSS:')) {
loadCssFromStreamData(line)
} else {
controller.enqueue(new TextEncoder().encode(line))
}
}
if (buffer && !buffer.startsWith('CSS:')) {
controller.enqueue(new TextEncoder().encode(buffer))
buffer = ''
}
},
flush() {
loadCssFromStreamData(buffer)
},
})
const newResponse = createFromReadableStream(
readable.pipeThrough(loadCssFromFlight)
)
rscCache.set(cacheKey, newResponse)
return newResponse
}
function ServerRoot({ cacheKey }: { cacheKey: string }) {
React.useEffect(() => {
rscCache.delete(cacheKey)
})
const response = useInitialServerResponse(cacheKey)
const root = response.readRoot()
return root
}
function Root({ children }: React.PropsWithChildren<{}>): React.ReactElement {
if (process.env.__NEXT_TEST_MODE) {
// eslint-disable-next-line react-hooks/rules-of-hooks
React.useEffect(() => {
window.__NEXT_HYDRATED = true
if (window.__NEXT_HYDRATED_CB) {
window.__NEXT_HYDRATED_CB()
}
}, [])
}
return children as React.ReactElement
}
function RSCComponent() {
const cacheKey = getCacheKey()
return <ServerRoot cacheKey={cacheKey} />
}
export function hydrate() {
renderReactElement(appElement!, () => (
<React.StrictMode>
<Root>
<RSCComponent />
</Root>
</React.StrictMode>
))
}