Document missing react-dom server rendering and hydration options (#8632)

* Document missing Fizz server rendering options and fix resume references

This adds the `formState`, `importMap`, `onHeaders`, and `maxHeadersLength` options to the `renderToPipeableStream` and `renderToReadableStream` reference pages, documents the object form of `nonce` for separate script and style nonces, and adds `importMap`, `onHeaders`, and `maxHeadersLength` to the `prerender` and `prerenderToNodeStream` pages. All of these options are supported in stable releases but were never documented. The `resumeAndPrerender` entries on the `react-dom/static` index were marked as experimental-only even though they ship in stable releases, so the badge is removed, and the `resumeAndPrerender` intro destructured a `postpone` property that is actually called `postponed`.

The `resumeToPipeableStream` page no longer documents a `signal` option because the Node.js implementation neither types nor reads it, and it now documents the `onAllReady` callback that the implementation does support. The same page referred to `resume` in its intro and Returns section where it meant `resumeToPipeableStream`, and the `react-dom/server` index linked both resume entries to the `renderToPipeableStream` page; they now point at their own pages.

Co-Authored-By: Claude Code (kimi-k3[1m]) <noreply@anthropic.com>

* Document the formState option for hydrateRoot

This adds the `formState` option to the `hydrateRoot` reference. The option carries the form state produced by a Server Function form submission so that `useActionState` with a `permalink` returns the submitted state during hydration instead of the initial state, and it must match the `formState` passed to the server renderer. The option shipped in React 19.0 but was never documented.

---------

Co-authored-by: Claude Code (kimi-k3[1m]) <noreply@anthropic.com>

Author: eps1lon

src/content/reference/react-dom/client/hydrateRoot.md

@@ -45,6 +45,7 @@ React will attach to the HTML that exists inside the `domNode`, and take over ma
   * **optional** `onUncaughtError`: Callback called when an error is thrown and not caught by an Error Boundary. Called with the `error` that was thrown and an `errorInfo` object containing the `componentStack`.
   * **optional** `onRecoverableError`: Callback called when React automatically recovers from errors. Called with the `error` React throws, and an `errorInfo` object containing the `componentStack`. Some recoverable errors may include the original error cause as `error.cause`.
   * **optional** `identifierPrefix`: A string prefix React uses for IDs generated by [`useId`.](/reference/react/useId) Useful to avoid conflicts when using multiple roots on the same page. Must be the same prefix as used on the server.
+  * **optional** `formState`: The form state from a form submission handled by a [Server Function](/reference/rsc/server-functions). If the page was rendered on the server in response to a submission of a form that uses [`useActionState`](/reference/react/useActionState) with a `permalink`, pass the resulting form state so that `useActionState` returns the submitted state instead of the `initialState`. Must be the same value as the `formState` passed to the [server renderer.](/reference/react-dom/server/renderToPipeableStream#parameters) This is typically passed through by your framework.
 
 
 #### Returns {/*returns*/}

src/content/reference/react-dom/server/index.md

@@ -15,7 +15,7 @@ The `react-dom/server` APIs let you server-side render React components to HTML.
 These methods are only available in the environments with [Web Streams](https://developer.mozilla.org/en-US/docs/Web/API/Streams_API), which includes browsers, Deno, and some modern edge runtimes:
 
 * [`renderToReadableStream`](/reference/react-dom/server/renderToReadableStream) renders a React tree to a [Readable Web Stream.](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream)
-* [`resume`](/reference/react-dom/server/renderToPipeableStream) resumes [`prerender`](/reference/react-dom/static/prerender) to a [Readable Web Stream](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream).
+* [`resume`](/reference/react-dom/server/resume) resumes [`prerender`](/reference/react-dom/static/prerender) to a [Readable Web Stream](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream).
 
 
 <Note>
@@ -30,7 +30,7 @@ Node.js also includes these methods for compatibility, but they are not recommen
 These methods are only available in the environments with [Node.js Streams:](https://nodejs.org/api/stream.html)
 
 * [`renderToPipeableStream`](/reference/react-dom/server/renderToPipeableStream) renders a React tree to a pipeable [Node.js Stream.](https://nodejs.org/api/stream.html)
-* [`resumeToPipeableStream`](/reference/react-dom/server/renderToPipeableStream) resumes [`prerenderToNodeStream`](/reference/react-dom/static/prerenderToNodeStream) to a pipeable [Node.js Stream.](https://nodejs.org/api/stream.html)
+* [`resumeToPipeableStream`](/reference/react-dom/server/resumeToPipeableStream) resumes [`prerenderToNodeStream`](/reference/react-dom/static/prerenderToNodeStream) to a pipeable [Node.js Stream.](https://nodejs.org/api/stream.html)
 
 ---
 

src/content/reference/react-dom/server/renderToPipeableStream.md

@@ -52,12 +52,16 @@ On the client, call [`hydrateRoot`](/reference/react-dom/client/hydrateRoot) to
   * **optional** `bootstrapScriptContent`: If specified, this string will be placed in an inline `<script>` tag.
   * **optional** `bootstrapScripts`: An array of string URLs for the `<script>` tags to emit on the page. Use this to include the `<script>` that calls [`hydrateRoot`.](/reference/react-dom/client/hydrateRoot) Omit it if you don't want to run React on the client at all.
   * **optional** `bootstrapModules`: Like `bootstrapScripts`, but emits [`<script type="module">`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules) instead.
+  * **optional** `formState`: The form state from a form submission handled by a [Server Function](/reference/rsc/server-functions). If the page is rendered in response to a submission of a form that uses [`useActionState`](/reference/react/useActionState) with a `permalink`, pass the resulting form state so that React embeds it into the HTML for hydration. The same value must be passed to [`hydrateRoot`](/reference/react-dom/client/hydrateRoot#parameters) on the client. This is typically passed through by your framework.
   * **optional** `identifierPrefix`: A string prefix React uses for IDs generated by [`useId`.](/reference/react/useId) Useful to avoid conflicts when using multiple roots on the same page. Must be the same prefix as passed to [`hydrateRoot`.](/reference/react-dom/client/hydrateRoot#parameters)
+  * **optional** `importMap`: An [import map](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script/type/importmap) object with `imports` and `scopes` properties. React emits it as an inline `<script type="importmap">` tag before any module scripts, so that `<script type="module">` tags (for example, from `bootstrapModules`) can use bare module specifiers. <CanaryBadge /> When `nonce` is set, it is also applied to the import map script.
+  * **optional** `maxHeadersLength`: The maximum total length of the header content passed to `onHeaders`, measured in UTF-16 code units. Defaults to 2000. Once the limit is reached, React stops adding resource hints to the headers.
   * **optional** `namespaceURI`: A string with the root [namespace URI](https://developer.mozilla.org/en-US/docs/Web/API/Document/createElementNS#important_namespace_uris) for the stream. Defaults to regular HTML. Pass `'http://www.w3.org/2000/svg'` for SVG or `'http://www.w3.org/1998/Math/MathML'` for MathML.
-  * **optional** `nonce`: A [`nonce`](http://developer.mozilla.org/en-US/docs/Web/HTML/Element/script#nonce) string to allow scripts for [`script-src` Content-Security-Policy](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src).
+  * **optional** `nonce`: A [`nonce`](http://developer.mozilla.org/en-US/docs/Web/HTML/Element/script#nonce) string to allow scripts for [`script-src` Content-Security-Policy](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src). To use different nonces for scripts and styles, pass an object with `script` and `style` properties instead.
   * **optional** `onAllReady`: A callback that fires when all rendering is complete, including both the [shell](#specifying-what-goes-into-the-shell) and all additional [content.](#streaming-more-content-as-it-loads) You can use this instead of `onShellReady` [for crawlers and static generation.](#waiting-for-all-content-to-load-for-crawlers-and-static-generation) If you start streaming here, you won't get any progressive loading. The stream will contain the final HTML.
   * <CanaryBadge /> **optional** `onBrowserBailout`: A callback React calls when it recovers from [`browser()`](/reference/react-dom/browser) by leaving a Suspense fallback for the browser to replace. It receives an `Error` describing the browser-only render and an `errorInfo` object containing the `componentStack`. If a reason was passed to `browser`, it is available as `error.cause`. By default, React does nothing. [See how to report browser-only rendering.](/reference/react-dom/browser#reporting-browser-only-rendering-on-the-server)
   * **optional** `onError`: A callback that fires whenever there is a server error, whether [recoverable](#recovering-from-errors-outside-the-shell) or [not.](#recovering-from-errors-inside-the-shell) By default, this only calls `console.error`. If you override it to [log crash reports,](#logging-crashes-on-the-server) make sure that you still call `console.error`. You can also use it to [adjust the status code](#setting-the-status-code) before the shell is emitted.
+  * **optional** `onHeaders`: A callback that fires when React has determined the resource hints for the document, such as preconnects and stylesheet, font, or high-priority image preloads. It receives an object with a `Link` property containing the corresponding [`Link` header](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/link) value, so you can send it as an HTTP response header or as a [103 Early Hints](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/103) response. React calls it even when there are no resource hints to send. The header content is capped by `maxHeadersLength`.
   * **optional** `onShellReady`: A callback that fires right after the [initial shell](#specifying-what-goes-into-the-shell) has been rendered. You can [set the status code](#setting-the-status-code) and call `pipe` here to start streaming. React will [stream the additional content](#streaming-more-content-as-it-loads) after the shell along with the inline `<script>` tags that replace the HTML loading fallbacks with the content.
   * **optional** `onShellError`: A callback that fires if there was an error rendering the initial shell.  It receives the error as an argument. No bytes were emitted from the stream yet, and neither `onShellReady` nor `onAllReady` will get called, so you can [output a fallback HTML shell.](#recovering-from-errors-inside-the-shell)
   * **optional** `progressiveChunkSize`: The number of bytes in a chunk. [Read more about the default heuristic.](https://github.com/react/react/blob/14c2be8dac2d5482fda8a0906a31d239df8551fc/packages/react-server/src/ReactFizzServer.js#L210-L225)

src/content/reference/react-dom/server/renderToReadableStream.md

@@ -53,11 +53,15 @@ On the client, call [`hydrateRoot`](/reference/react-dom/client/hydrateRoot) to
   * **optional** `bootstrapScriptContent`: If specified, this string will be placed in an inline `<script>` tag.
   * **optional** `bootstrapScripts`: An array of string URLs for the `<script>` tags to emit on the page. Use this to include the `<script>` that calls [`hydrateRoot`.](/reference/react-dom/client/hydrateRoot) Omit it if you don't want to run React on the client at all.
   * **optional** `bootstrapModules`: Like `bootstrapScripts`, but emits [`<script type="module">`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules) instead.
+  * **optional** `formState`: The form state from a form submission handled by a [Server Function](/reference/rsc/server-functions). If the page is rendered in response to a submission of a form that uses [`useActionState`](/reference/react/useActionState) with a `permalink`, pass the resulting form state so that React embeds it into the HTML for hydration. The same value must be passed to [`hydrateRoot`](/reference/react-dom/client/hydrateRoot#parameters) on the client. This is typically passed through by your framework.
   * **optional** `identifierPrefix`: A string prefix React uses for IDs generated by [`useId`.](/reference/react/useId) Useful to avoid conflicts when using multiple roots on the same page. Must be the same prefix as passed to [`hydrateRoot`.](/reference/react-dom/client/hydrateRoot#parameters)
+  * **optional** `importMap`: An [import map](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script/type/importmap) object with `imports` and `scopes` properties. React emits it as an inline `<script type="importmap">` tag before any module scripts, so that `<script type="module">` tags (for example, from `bootstrapModules`) can use bare module specifiers. <CanaryBadge /> When `nonce` is set, it is also applied to the import map script.
+  * **optional** `maxHeadersLength`: The maximum total length of the header content passed to `onHeaders`, measured in UTF-16 code units. Defaults to 2000. Once the limit is reached, React stops adding resource hints to the headers.
   * **optional** `namespaceURI`: A string with the root [namespace URI](https://developer.mozilla.org/en-US/docs/Web/API/Document/createElementNS#important_namespace_uris) for the stream. Defaults to regular HTML. Pass `'http://www.w3.org/2000/svg'` for SVG or `'http://www.w3.org/1998/Math/MathML'` for MathML.
-  * **optional** `nonce`: A [`nonce`](http://developer.mozilla.org/en-US/docs/Web/HTML/Element/script#nonce) string to allow scripts for [`script-src` Content-Security-Policy](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src).
+  * **optional** `nonce`: A [`nonce`](http://developer.mozilla.org/en-US/docs/Web/HTML/Element/script#nonce) string to allow scripts for [`script-src` Content-Security-Policy](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src). To use different nonces for scripts and styles, pass an object with `script` and `style` properties instead.
   * <CanaryBadge /> **optional** `onBrowserBailout`: A callback React calls when it recovers from [`browser()`](/reference/react-dom/browser) by leaving a Suspense fallback for the browser to replace. It receives an `Error` describing the browser-only render and an `errorInfo` object containing the `componentStack`. If a reason was passed to `browser`, it is available as `error.cause`. By default, React does nothing. [See how to report browser-only rendering.](/reference/react-dom/browser#reporting-browser-only-rendering-on-the-server)
   * **optional** `onError`: A callback that fires whenever there is a server error, whether [recoverable](#recovering-from-errors-outside-the-shell) or [not.](#recovering-from-errors-inside-the-shell) By default, this only calls `console.error`. If you override it to [log crash reports,](#logging-crashes-on-the-server) make sure that you still call `console.error`. You can also use it to [adjust the status code](#setting-the-status-code) before the shell is emitted.
+  * **optional** `onHeaders`: A callback that fires when React has determined the resource hints for the document, such as preconnects and stylesheet, font, or high-priority image preloads. It receives a [`Headers`](https://developer.mozilla.org/en-US/docs/Web/API/Headers) instance containing the corresponding [`Link` header](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/link) value, so you can send it as an HTTP response header or as a [103 Early Hints](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/103) response. React calls it even when there are no resource hints to send. The header content is capped by `maxHeadersLength`.
   * **optional** `progressiveChunkSize`: The number of bytes in a chunk. [Read more about the default heuristic.](https://github.com/react/react/blob/14c2be8dac2d5482fda8a0906a31d239df8551fc/packages/react-server/src/ReactFizzServer.js#L210-L225)
   * **optional** `signal`: An [abort signal](https://developer.mozilla.org/en-US/docs/Web/API/AbortSignal) that lets you [abort server rendering](#aborting-server-rendering) and render the rest on the client.
 

src/content/reference/react-dom/server/resumeToPipeableStream.md

@@ -26,10 +26,10 @@ This API is specific to Node.js. Environments with [Web Streams,](https://develo
 
 ### `resumeToPipeableStream(node, postponed, options?)` {/*resume-to-pipeable-stream*/}
 
-Call `resume` to resume rendering a pre-rendered React tree as HTML into a [Node.js Stream.](https://nodejs.org/api/stream.html#writable-streams)
+Call `resumeToPipeableStream` to resume rendering a pre-rendered React tree as HTML into a [Node.js Stream.](https://nodejs.org/api/stream.html#writable-streams)
 
 ```js
-import { resume } from 'react-dom/server';
+import { resumeToPipeableStream } from 'react-dom/server';
 import {getPostponedState} from './storage';
 
 async function handler(request, response) {
@@ -50,7 +50,7 @@ async function handler(request, response) {
 * `postponedState`: The opaque `postpone` object returned from a [prerender API](/reference/react-dom/static/index), loaded from wherever you stored it (e.g. redis, a file, or S3).
 * **optional** `options`: An object with streaming options.
   * **optional** `nonce`: A [`nonce`](http://developer.mozilla.org/en-US/docs/Web/HTML/Element/script#nonce) string to allow scripts for [`script-src` Content-Security-Policy](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src).
-  * **optional** `signal`: An [abort signal](https://developer.mozilla.org/en-US/docs/Web/API/AbortSignal) that lets you [abort server rendering](#aborting-server-rendering) and render the rest on the client.
+  * **optional** `onAllReady`: A callback that fires when all rendering is complete, including both the shell and all additional content. You can call `pipe` here instead of in `onShellReady` for crawlers and static generation. The stream will contain the final HTML.
   * <CanaryBadge /> **optional** `onBrowserBailout`: A callback React calls when it recovers from [`browser()`](/reference/react-dom/browser) by leaving a Suspense fallback for the browser to replace. It receives an `Error` describing the browser-only render and an `errorInfo` object containing the `componentStack`. If a reason was passed to `browser`, it is available as `error.cause`. By default, React does nothing. [See how to report browser-only rendering.](/reference/react-dom/browser#reporting-browser-only-rendering-on-the-server)
   * **optional** `onError`: A callback that fires whenever there is a server error, whether [recoverable](/reference/react-dom/server/renderToReadableStream#recovering-from-errors-outside-the-shell) or [not.](/reference/react-dom/server/renderToReadableStream#recovering-from-errors-inside-the-shell) By default, this only calls `console.error`. If you override it to [log crash reports,](/reference/react-dom/server/renderToReadableStream#logging-crashes-on-the-server) make sure that you still call `console.error`.
   * **optional** `onShellReady`: A callback that fires right after the [shell](#specifying-what-goes-into-the-shell) has finished. You can call `pipe` here to start streaming. React will [stream the additional content](#streaming-more-content-as-it-loads) after the shell along with the inline `<script>` tags that replace the HTML loading fallbacks with the content.
@@ -59,7 +59,7 @@ async function handler(request, response) {
 
 #### Returns {/*returns*/}
 
-`resume` returns an object with two methods:
+`resumeToPipeableStream` returns an object with two methods:
 
 * `pipe` outputs the HTML into the provided [Writable Node.js Stream.](https://nodejs.org/api/stream.html#writable-streams) Call `pipe` in `onShellReady` if you want to enable streaming, or in `onAllReady` for crawlers and static generation.
 * `abort` lets you [abort server rendering](#aborting-server-rendering) and render the rest on the client.