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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,205 @@ | ||
| /* 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, { useState, startTransition } from 'react' | ||
| import { RefreshContext } from './streaming/refresh' | ||
| import { createFromFetch } from 'next/dist/compiled/react-server-dom-webpack' | ||
|
|
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| /// <reference types="react-dom/experimental" /> | ||
|
|
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| export const version = process.env.__NEXT_VERSION | ||
|
|
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| const appElement: HTMLElement | Document | null = document | ||
|
|
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| let reactRoot: any = null | ||
|
|
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| 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: WritableStreamDefaultWriter | 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.write(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(writer: WritableStreamDefaultWriter) { | ||
| if (initialServerDataBuffer) { | ||
| initialServerDataBuffer.forEach((val) => { | ||
| writer.write(encoder.encode(val)) | ||
| }) | ||
| if (initialServerDataLoaded && !initialServerDataFlushed) { | ||
| writer.close() | ||
| initialServerDataFlushed = true | ||
| initialServerDataBuffer = undefined | ||
| } | ||
| } | ||
|
|
||
| initialServerDataWriter = writer | ||
| } | ||
|
|
||
| // 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 fetchFlight(href: string, props?: any) { | ||
| const url = new URL(href, location.origin) | ||
| const searchParams = url.searchParams | ||
| searchParams.append('__flight__', '1') | ||
| if (props) { | ||
| searchParams.append('__props__', JSON.stringify(props)) | ||
| } | ||
| return fetch(url.toString()) | ||
| } | ||
|
|
||
| function useServerResponse(cacheKey: string, serialized?: string) { | ||
| let response = rscCache.get(cacheKey) | ||
| if (response) return response | ||
|
|
||
| if (initialServerDataBuffer) { | ||
| const t = new TransformStream() | ||
| const writer = t.writable.getWriter() | ||
| response = createFromFetch(Promise.resolve({ body: t.readable })) | ||
| nextServerDataRegisterWriter(writer) | ||
| } else { | ||
| const fetchPromise = serialized | ||
| ? (() => { | ||
| const t = new TransformStream() | ||
| const writer = t.writable.getWriter() | ||
| writer.ready.then(() => { | ||
| writer.write(new TextEncoder().encode(serialized)) | ||
| }) | ||
| return Promise.resolve({ body: t.readable }) | ||
| })() | ||
| : fetchFlight(getCacheKey()) | ||
| response = createFromFetch(fetchPromise) | ||
| } | ||
|
|
||
| rscCache.set(cacheKey, response) | ||
| return response | ||
| } | ||
|
|
||
| const ServerRoot = ({ | ||
| cacheKey, | ||
| serialized, | ||
| }: { | ||
| cacheKey: string | ||
| serialized?: string | ||
| }) => { | ||
| React.useEffect(() => { | ||
| rscCache.delete(cacheKey) | ||
| }) | ||
| const response = useServerResponse(cacheKey, serialized) | ||
| 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 | ||
| } | ||
|
|
||
| const RSCComponent = (props: any) => { | ||
| const cacheKey = getCacheKey() | ||
| const { __flight_serialized__ } = props | ||
| const [, dispatch] = useState({}) | ||
| const rerender = () => dispatch({}) | ||
| // If there is no cache, or there is serialized data already | ||
| function refreshCache(nextProps: any) { | ||
| startTransition(() => { | ||
| const currentCacheKey = getCacheKey() | ||
| const response = createFromFetch(fetchFlight(currentCacheKey, nextProps)) | ||
|
|
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| rscCache.set(currentCacheKey, response) | ||
| rerender() | ||
| }) | ||
| } | ||
|
|
||
| return ( | ||
| <RefreshContext.Provider value={refreshCache}> | ||
| <ServerRoot cacheKey={cacheKey} serialized={__flight_serialized__} /> | ||
| </RefreshContext.Provider> | ||
| ) | ||
| } | ||
|
|
||
| export function hydrate() { | ||
| renderReactElement(appElement!, () => ( | ||
| <React.StrictMode> | ||
| <Root> | ||
| <RSCComponent /> | ||
| </Root> | ||
| </React.StrictMode> | ||
| )) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,8 @@ | ||
| import { hydrate, version } from './root-index' | ||
|
|
||
| window.next = { | ||
| version, | ||
| root: true, | ||
| } | ||
|
|
||
| hydrate() |
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