next
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The React Framework
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JavaScript
import { getTracer } from '../lib/trace/tracer';
import { AppRenderSpan } from '../lib/trace/constants';
import { DetachedPromise } from '../../lib/detached-promise';
import { scheduleImmediate, atLeastOneTask, waitAtLeastOneReactRenderTask } from '../../lib/scheduler';
import { ENCODED_TAGS } from './encoded-tags';
import { indexOfUint8Array, isEquivalentUint8Arrays, removeFromUint8Array } from './uint8array-helpers';
import { MISSING_ROOT_TAGS_ERROR } from '../../shared/lib/errors/constants';
import { insertBuildIdComment } from '../../shared/lib/segment-cache/output-export-prefetch-encoding';
import { RSC_HEADER, NEXT_ROUTER_PREFETCH_HEADER, NEXT_ROUTER_SEGMENT_PREFETCH_HEADER, NEXT_RSC_UNION_QUERY } from '../../client/components/app-router-headers';
import { computeCacheBustingSearchParam } from '../../shared/lib/router/utils/cache-busting-search-param';
function voidCatch() {
// this catcher is designed to be used with pipeTo where we expect the underlying
// pipe implementation to forward errors but we don't want the pipeTo promise to reject
// and be unhandled
}
// We can share the same encoder instance everywhere
// Notably we cannot do the same for TextDecoder because it is stateful
// when handling streaming data
const encoder = new TextEncoder();
export function chainStreams(...streams) {
// If we have no streams, return an empty stream. This behavior is
// intentional as we're now providing the `RenderResult.EMPTY` value.
if (streams.length === 0) {
return new ReadableStream({
start (controller) {
controller.close();
}
});
}
// If we only have 1 stream we fast path it by returning just this stream
if (streams.length === 1) {
return streams[0];
}
const { readable, writable } = new TransformStream();
// We always initiate pipeTo immediately. We know we have at least 2 streams
// so we need to avoid closing the writable when this one finishes.
let promise = streams[0].pipeTo(writable, {
preventClose: true
});
let i = 1;
for(; i < streams.length - 1; i++){
const nextStream = streams[i];
promise = promise.then(()=>nextStream.pipeTo(writable, {
preventClose: true
}));
}
// We can omit the length check because we halted before the last stream and there
// is at least two streams so the lastStream here will always be defined
const lastStream = streams[i];
promise = promise.then(()=>lastStream.pipeTo(writable));
// Catch any errors from the streams and ignore them, they will be handled
// by whatever is consuming the readable stream.
promise.catch(voidCatch);
return readable;
}
export function streamFromString(str) {
return new ReadableStream({
start (controller) {
controller.enqueue(encoder.encode(str));
controller.close();
}
});
}
export function streamFromBuffer(chunk) {
return new ReadableStream({
start (controller) {
controller.enqueue(chunk);
controller.close();
}
});
}
async function streamToChunks(stream) {
const reader = stream.getReader();
const chunks = [];
while(true){
const { done, value } = await reader.read();
if (done) {
break;
}
chunks.push(value);
}
return chunks;
}
function concatUint8Arrays(chunks) {
const totalLength = chunks.reduce((sum, chunk)=>sum + chunk.length, 0);
const result = new Uint8Array(totalLength);
let offset = 0;
for (const chunk of chunks){
result.set(chunk, offset);
offset += chunk.length;
}
return result;
}
export async function streamToUint8Array(stream) {
return concatUint8Arrays(await streamToChunks(stream));
}
export async function streamToBuffer(stream) {
return Buffer.concat(await streamToChunks(stream));
}
export async function streamToString(stream, signal) {
const decoder = new TextDecoder('utf-8', {
fatal: true
});
let string = '';
for await (const chunk of stream){
if (signal == null ? void 0 : signal.aborted) {
return string;
}
string += decoder.decode(chunk, {
stream: true
});
}
string += decoder.decode();
return string;
}
export function createBufferedTransformStream(options = {}) {
const { maxBufferByteLength = Infinity } = options;
let bufferedChunks = [];
let bufferByteLength = 0;
let pending;
const flush = (controller)=>{
try {
if (bufferedChunks.length === 0) {
return;
}
const chunk = new Uint8Array(bufferByteLength);
let copiedBytes = 0;
for(let i = 0; i < bufferedChunks.length; i++){
const bufferedChunk = bufferedChunks[i];
chunk.set(bufferedChunk, copiedBytes);
copiedBytes += bufferedChunk.byteLength;
}
// We just wrote all the buffered chunks so we need to reset the bufferedChunks array
// and our bufferByteLength to prepare for the next round of buffered chunks
bufferedChunks.length = 0;
bufferByteLength = 0;
controller.enqueue(chunk);
} catch {
// If an error occurs while enqueuing, it can't be due to this
// transformer. It's most likely caused by the controller having been
// errored (for example, if the stream was cancelled).
}
};
const scheduleFlush = (controller)=>{
if (pending) {
return;
}
const detached = new DetachedPromise();
pending = detached;
scheduleImmediate(()=>{
try {
flush(controller);
} finally{
pending = undefined;
detached.resolve();
}
});
};
return new TransformStream({
transform (chunk, controller) {
// Combine the previous buffer with the new chunk.
bufferedChunks.push(chunk);
bufferByteLength += chunk.byteLength;
if (bufferByteLength >= maxBufferByteLength) {
flush(controller);
} else {
scheduleFlush(controller);
}
},
flush () {
return pending == null ? void 0 : pending.promise;
}
});
}
function createPrefetchCommentStream(isBuildTimePrerendering, buildId) {
// Insert an extra comment at the beginning of the HTML document. This must
// come after the DOCTYPE, which is inserted by React.
//
// The first chunk sent by React will contain the doctype. After that, we can
// pass through the rest of the chunks as-is.
let didTransformFirstChunk = false;
return new TransformStream({
transform (chunk, controller) {
if (isBuildTimePrerendering && !didTransformFirstChunk) {
didTransformFirstChunk = true;
const decoder = new TextDecoder('utf-8', {
fatal: true
});
const chunkStr = decoder.decode(chunk, {
stream: true
});
const updatedChunkStr = insertBuildIdComment(chunkStr, buildId);
controller.enqueue(encoder.encode(updatedChunkStr));
return;
}
controller.enqueue(chunk);
}
});
}
export function renderToInitialFizzStream({ ReactDOMServer, element, streamOptions }) {
return getTracer().trace(AppRenderSpan.renderToReadableStream, async ()=>ReactDOMServer.renderToReadableStream(element, streamOptions));
}
function createMetadataTransformStream(insert) {
let chunkIndex = -1;
let isMarkRemoved = false;
return new TransformStream({
async transform (chunk, controller) {
let iconMarkIndex = -1;
let closedHeadIndex = -1;
chunkIndex++;
if (isMarkRemoved) {
controller.enqueue(chunk);
return;
}
let iconMarkLength = 0;
// Only search for the closed head tag once
if (iconMarkIndex === -1) {
iconMarkIndex = indexOfUint8Array(chunk, ENCODED_TAGS.META.ICON_MARK);
if (iconMarkIndex === -1) {
controller.enqueue(chunk);
return;
} else {
// When we found the `<meta name="«nxt-icon»"` tag prefix, we will remove it from the chunk.
// Its close tag could either be `/>` or `>`, checking the next char to ensure we cover both cases.
iconMarkLength = ENCODED_TAGS.META.ICON_MARK.length;
// Check if next char is /, this is for xml mode.
if (chunk[iconMarkIndex + iconMarkLength] === 47) {
iconMarkLength += 2;
} else {
// The last char is `>`
iconMarkLength++;
}
}
}
// Check if icon mark is inside <head> tag in the first chunk.
if (chunkIndex === 0) {
closedHeadIndex = indexOfUint8Array(chunk, ENCODED_TAGS.CLOSED.HEAD);
if (iconMarkIndex !== -1) {
// The mark icon is located in the 1st chunk before the head tag.
// We do not need to insert the script tag in this case because it's in the head.
// Just remove the icon mark from the chunk.
if (iconMarkIndex < closedHeadIndex) {
const replaced = new Uint8Array(chunk.length - iconMarkLength);
// Remove the icon mark from the chunk.
replaced.set(chunk.subarray(0, iconMarkIndex));
replaced.set(chunk.subarray(iconMarkIndex + iconMarkLength), iconMarkIndex);
chunk = replaced;
} else {
// The icon mark is after the head tag, replace and insert the script tag at that position.
const insertion = await insert();
const encodedInsertion = encoder.encode(insertion);
const insertionLength = encodedInsertion.length;
const replaced = new Uint8Array(chunk.length - iconMarkLength + insertionLength);
replaced.set(chunk.subarray(0, iconMarkIndex));
replaced.set(encodedInsertion, iconMarkIndex);
replaced.set(chunk.subarray(iconMarkIndex + iconMarkLength), iconMarkIndex + insertionLength);
chunk = replaced;
}
isMarkRemoved = true;
}
// If there's no icon mark located, it will be handled later when if present in the following chunks.
} else {
// When it's appeared in the following chunks, we'll need to
// remove the mark and then insert the script tag at that position.
const insertion = await insert();
const encodedInsertion = encoder.encode(insertion);
const insertionLength = encodedInsertion.length;
// Replace the icon mark with the hoist script or empty string.
const replaced = new Uint8Array(chunk.length - iconMarkLength + insertionLength);
// Set the first part of the chunk, before the icon mark.
replaced.set(chunk.subarray(0, iconMarkIndex));
// Set the insertion after the icon mark.
replaced.set(encodedInsertion, iconMarkIndex);
// Set the rest of the chunk after the icon mark.
replaced.set(chunk.subarray(iconMarkIndex + iconMarkLength), iconMarkIndex + insertionLength);
chunk = replaced;
isMarkRemoved = true;
}
controller.enqueue(chunk);
}
});
}
function createHeadInsertionTransformStream(insert) {
let inserted = false;
// We need to track if this transform saw any bytes because if it didn't
// we won't want to insert any server HTML at all
let hasBytes = false;
return new TransformStream({
async transform (chunk, controller) {
hasBytes = true;
const insertion = await insert();
if (inserted) {
if (insertion) {
const encodedInsertion = encoder.encode(insertion);
controller.enqueue(encodedInsertion);
}
controller.enqueue(chunk);
} else {
// TODO (@Ethan-Arrowood): Replace the generic `indexOfUint8Array` method with something finely tuned for the subset of things actually being checked for.
const index = indexOfUint8Array(chunk, ENCODED_TAGS.CLOSED.HEAD);
// In fully static rendering or non PPR rendering cases:
// `/head>` will always be found in the chunk in first chunk rendering.
if (index !== -1) {
if (insertion) {
const encodedInsertion = encoder.encode(insertion);
// Get the total count of the bytes in the chunk and the insertion
// e.g.
// chunk = <head><meta charset="utf-8"></head>
// insertion = <script>...</script>
// output = <head><meta charset="utf-8"> [ <script>...</script> ] </head>
const insertedHeadContent = new Uint8Array(chunk.length + encodedInsertion.length);
// Append the first part of the chunk, before the head tag
insertedHeadContent.set(chunk.slice(0, index));
// Append the server inserted content
insertedHeadContent.set(encodedInsertion, index);
// Append the rest of the chunk
insertedHeadContent.set(chunk.slice(index), index + encodedInsertion.length);
controller.enqueue(insertedHeadContent);
} else {
controller.enqueue(chunk);
}
inserted = true;
} else {
// This will happens in PPR rendering during next start, when the page is partially rendered.
// When the page resumes, the head tag will be found in the middle of the chunk.
// Where we just need to append the insertion and chunk to the current stream.
// e.g.
// PPR-static: <head>...</head><body> [ resume content ] </body>
// PPR-resume: [ insertion ] [ rest content ]
if (insertion) {
controller.enqueue(encoder.encode(insertion));
}
controller.enqueue(chunk);
inserted = true;
}
}
},
async flush (controller) {
// Check before closing if there's anything remaining to insert.
if (hasBytes) {
const insertion = await insert();
if (insertion) {
controller.enqueue(encoder.encode(insertion));
}
}
}
});
}
function createClientResumeScriptInsertionTransformStream() {
const segmentPath = '/_full';
const cacheBustingHeader = computeCacheBustingSearchParam('1', '/_full', undefined, undefined // headers[NEXT_URL]
);
const searchStr = `${NEXT_RSC_UNION_QUERY}=${cacheBustingHeader}`;
const NEXT_CLIENT_RESUME_SCRIPT = `<script>__NEXT_CLIENT_RESUME=fetch(location.pathname+'?${searchStr}',{credentials:'same-origin',headers:{'${RSC_HEADER}': '1','${NEXT_ROUTER_PREFETCH_HEADER}': '1','${NEXT_ROUTER_SEGMENT_PREFETCH_HEADER}': '${segmentPath}'}})</script>`;
let didAlreadyInsert = false;
return new TransformStream({
transform (chunk, controller) {
if (didAlreadyInsert) {
// Already inserted the script into the head. Pass through.
controller.enqueue(chunk);
return;
}
// TODO (@Ethan-Arrowood): Replace the generic `indexOfUint8Array` method with something finely tuned for the subset of things actually being checked for.
const headClosingTagIndex = indexOfUint8Array(chunk, ENCODED_TAGS.CLOSED.HEAD);
if (headClosingTagIndex === -1) {
// In fully static rendering or non PPR rendering cases:
// `/head>` will always be found in the chunk in first chunk rendering.
controller.enqueue(chunk);
return;
}
const encodedInsertion = encoder.encode(NEXT_CLIENT_RESUME_SCRIPT);
// Get the total count of the bytes in the chunk and the insertion
// e.g.
// chunk = <head><meta charset="utf-8"></head>
// insertion = <script>...</script>
// output = <head><meta charset="utf-8"> [ <script>...</script> ] </head>
const insertedHeadContent = new Uint8Array(chunk.length + encodedInsertion.length);
// Append the first part of the chunk, before the head tag
insertedHeadContent.set(chunk.slice(0, headClosingTagIndex));
// Append the server inserted content
insertedHeadContent.set(encodedInsertion, headClosingTagIndex);
// Append the rest of the chunk
insertedHeadContent.set(chunk.slice(headClosingTagIndex), headClosingTagIndex + encodedInsertion.length);
controller.enqueue(insertedHeadContent);
didAlreadyInsert = true;
}
});
}
// Suffix after main body content - scripts before </body>,
// but wait for the major chunks to be enqueued.
function createDeferredSuffixStream(suffix) {
let flushed = false;
let pending;
const flush = (controller)=>{
const detached = new DetachedPromise();
pending = detached;
scheduleImmediate(()=>{
try {
controller.enqueue(encoder.encode(suffix));
} catch {
// If an error occurs while enqueuing it can't be due to this
// transformers fault. It's likely due to the controller being
// errored due to the stream being cancelled.
} finally{
pending = undefined;
detached.resolve();
}
});
};
return new TransformStream({
transform (chunk, controller) {
controller.enqueue(chunk);
// If we've already flushed, we're done.
if (flushed) return;
// Schedule the flush to happen.
flushed = true;
flush(controller);
},
flush (controller) {
if (pending) return pending.promise;
if (flushed) return;
// Flush now.
controller.enqueue(encoder.encode(suffix));
}
});
}
function createFlightDataInjectionTransformStream(stream, delayDataUntilFirstHtmlChunk) {
let htmlStreamFinished = false;
let pull = null;
let donePulling = false;
function startOrContinuePulling(controller) {
if (!pull) {
pull = startPulling(controller);
}
return pull;
}
async function startPulling(controller) {
const reader = stream.getReader();
if (delayDataUntilFirstHtmlChunk) {
// NOTE: streaming flush
// We are buffering here for the inlined data stream because the
// "shell" stream might be chunkenized again by the underlying stream
// implementation, e.g. with a specific high-water mark. To ensure it's
// the safe timing to pipe the data stream, this extra tick is
// necessary.
// We don't start reading until we've left the current Task to ensure
// that it's inserted after flushing the shell. Note that this implementation
// might get stale if impl details of Fizz change in the future.
await atLeastOneTask();
}
try {
while(true){
const { done, value } = await reader.read();
if (done) {
donePulling = true;
return;
}
// We want to prioritize HTML over RSC data.
// The SSR render is based on the same RSC stream, so when we get a new RSC chunk,
// we're likely to produce an HTML chunk as well, so give it a chance to flush first.
if (!delayDataUntilFirstHtmlChunk && !htmlStreamFinished) {
await atLeastOneTask();
}
controller.enqueue(value);
}
} catch (err) {
controller.error(err);
}
}
return new TransformStream({
start (controller) {
if (!delayDataUntilFirstHtmlChunk) {
startOrContinuePulling(controller);
}
},
transform (chunk, controller) {
controller.enqueue(chunk);
// Start the streaming if it hasn't already been started yet.
if (delayDataUntilFirstHtmlChunk) {
startOrContinuePulling(controller);
}
},
flush (controller) {
htmlStreamFinished = true;
if (donePulling) {
return;
}
return startOrContinuePulling(controller);
}
});
}
const CLOSE_TAG = '</body></html>';
/**
* This transform stream moves the suffix to the end of the stream, so results
* like `</body></html><script>...</script>` will be transformed to
* `<script>...</script></body></html>`.
*/ function createMoveSuffixStream() {
let foundSuffix = false;
return new TransformStream({
transform (chunk, controller) {
if (foundSuffix) {
return controller.enqueue(chunk);
}
const index = indexOfUint8Array(chunk, ENCODED_TAGS.CLOSED.BODY_AND_HTML);
if (index > -1) {
foundSuffix = true;
// If the whole chunk is the suffix, then don't write anything, it will
// be written in the flush.
if (chunk.length === ENCODED_TAGS.CLOSED.BODY_AND_HTML.length) {
return;
}
// Write out the part before the suffix.
const before = chunk.slice(0, index);
controller.enqueue(before);
// In the case where the suffix is in the middle of the chunk, we need
// to split the chunk into two parts.
if (chunk.length > ENCODED_TAGS.CLOSED.BODY_AND_HTML.length + index) {
// Write out the part after the suffix.
const after = chunk.slice(index + ENCODED_TAGS.CLOSED.BODY_AND_HTML.length);
controller.enqueue(after);
}
} else {
controller.enqueue(chunk);
}
},
flush (controller) {
// Even if we didn't find the suffix, the HTML is not valid if we don't
// add it, so insert it at the end.
controller.enqueue(ENCODED_TAGS.CLOSED.BODY_AND_HTML);
}
});
}
function createStripDocumentClosingTagsTransform() {
return new TransformStream({
transform (chunk, controller) {
// We rely on the assumption that chunks will never break across a code unit.
// This is reasonable because we currently concat all of React's output from a single
// flush into one chunk before streaming it forward which means the chunk will represent
// a single coherent utf-8 string. This is not safe to use if we change our streaming to no
// longer do this large buffered chunk
if (isEquivalentUint8Arrays(chunk, ENCODED_TAGS.CLOSED.BODY_AND_HTML) || isEquivalentUint8Arrays(chunk, ENCODED_TAGS.CLOSED.BODY) || isEquivalentUint8Arrays(chunk, ENCODED_TAGS.CLOSED.HTML)) {
// the entire chunk is the closing tags; return without enqueueing anything.
return;
}
// We assume these tags will go at together at the end of the document and that
// they won't appear anywhere else in the document. This is not really a safe assumption
// but until we revamp our streaming infra this is a performant way to string the tags
chunk = removeFromUint8Array(chunk, ENCODED_TAGS.CLOSED.BODY);
chunk = removeFromUint8Array(chunk, ENCODED_TAGS.CLOSED.HTML);
controller.enqueue(chunk);
}
});
}
/*
* Checks if the root layout is missing the html or body tags
* and if so, it will inject a script tag to throw an error in the browser, showing the user
* the error message in the error overlay.
*/ export function createRootLayoutValidatorStream() {
let foundHtml = false;
let foundBody = false;
return new TransformStream({
async transform (chunk, controller) {
// Peek into the streamed chunk to see if the tags are present.
if (!foundHtml && indexOfUint8Array(chunk, ENCODED_TAGS.OPENING.HTML) > -1) {
foundHtml = true;
}
if (!foundBody && indexOfUint8Array(chunk, ENCODED_TAGS.OPENING.BODY) > -1) {
foundBody = true;
}
controller.enqueue(chunk);
},
flush (controller) {
const missingTags = [];
if (!foundHtml) missingTags.push('html');
if (!foundBody) missingTags.push('body');
if (!missingTags.length) return;
controller.enqueue(encoder.encode(`<html id="__next_error__">
<template
data-next-error-message="Missing ${missingTags.map((c)=>`<${c}>`).join(missingTags.length > 1 ? ' and ' : '')} tags in the root layout.\nRead more at https://nextjs.org/docs/messages/missing-root-layout-tags"
data-next-error-digest="${MISSING_ROOT_TAGS_ERROR}"
data-next-error-stack=""
></template>
`));
}
});
}
function chainTransformers(readable, transformers) {
let stream = readable;
for (const transformer of transformers){
if (!transformer) continue;
stream = stream.pipeThrough(transformer);
}
return stream;
}
export async function continueFizzStream(renderStream, { suffix, inlinedDataStream, isStaticGeneration, isBuildTimePrerendering, buildId, getServerInsertedHTML, getServerInsertedMetadata, validateRootLayout }) {
// Suffix itself might contain close tags at the end, so we need to split it.
const suffixUnclosed = suffix ? suffix.split(CLOSE_TAG, 1)[0] : null;
if (isStaticGeneration) {
// If we're generating static HTML we need to wait for it to resolve before continuing.
await renderStream.allReady;
} else {
// Otherwise, we want to make sure Fizz is done with all microtasky work
// before we start pulling the stream and cause a flush.
await waitAtLeastOneReactRenderTask();
}
return chainTransformers(renderStream, [
// Buffer everything to avoid flushing too frequently
createBufferedTransformStream(),
// Add build id comment to start of the HTML document (in export mode)
createPrefetchCommentStream(isBuildTimePrerendering, buildId),
// Transform metadata
createMetadataTransformStream(getServerInsertedMetadata),
// Insert suffix content
suffixUnclosed != null && suffixUnclosed.length > 0 ? createDeferredSuffixStream(suffixUnclosed) : null,
// Insert the inlined data (Flight data, form state, etc.) stream into the HTML
inlinedDataStream ? createFlightDataInjectionTransformStream(inlinedDataStream, true) : null,
// Validate the root layout for missing html or body tags
validateRootLayout ? createRootLayoutValidatorStream() : null,
// Close tags should always be deferred to the end
createMoveSuffixStream(),
// Special head insertions
// TODO-APP: Insert server side html to end of head in app layout rendering, to avoid
// hydration errors. Remove this once it's ready to be handled by react itself.
createHeadInsertionTransformStream(getServerInsertedHTML)
]);
}
export async function continueDynamicPrerender(prerenderStream, { getServerInsertedHTML, getServerInsertedMetadata }) {
return prerenderStream// Buffer everything to avoid flushing too frequently
.pipeThrough(createBufferedTransformStream()).pipeThrough(createStripDocumentClosingTagsTransform())// Insert generated tags to head
.pipeThrough(createHeadInsertionTransformStream(getServerInsertedHTML))// Transform metadata
.pipeThrough(createMetadataTransformStream(getServerInsertedMetadata));
}
export async function continueStaticPrerender(prerenderStream, { inlinedDataStream, getServerInsertedHTML, getServerInsertedMetadata, isBuildTimePrerendering, buildId }) {
return prerenderStream// Buffer everything to avoid flushing too frequently
.pipeThrough(createBufferedTransformStream())// Add build id comment to start of the HTML document (in export mode)
.pipeThrough(createPrefetchCommentStream(isBuildTimePrerendering, buildId))// Insert generated tags to head
.pipeThrough(createHeadInsertionTransformStream(getServerInsertedHTML))// Transform metadata
.pipeThrough(createMetadataTransformStream(getServerInsertedMetadata))// Insert the inlined data (Flight data, form state, etc.) stream into the HTML
.pipeThrough(createFlightDataInjectionTransformStream(inlinedDataStream, true))// Close tags should always be deferred to the end
.pipeThrough(createMoveSuffixStream());
}
export async function continueStaticFallbackPrerender(prerenderStream, { inlinedDataStream, getServerInsertedHTML, getServerInsertedMetadata, isBuildTimePrerendering, buildId }) {
// Same as `continueStaticPrerender`, but also inserts an additional script
// to instruct the client to start fetching the hydration data as early
// as possible.
return prerenderStream// Buffer everything to avoid flushing too frequently
.pipeThrough(createBufferedTransformStream())// Add build id comment to start of the HTML document (in export mode)
.pipeThrough(createPrefetchCommentStream(isBuildTimePrerendering, buildId))// Insert generated tags to head
.pipeThrough(createHeadInsertionTransformStream(getServerInsertedHTML))// Insert the client resume script into the head
.pipeThrough(createClientResumeScriptInsertionTransformStream())// Transform metadata
.pipeThrough(createMetadataTransformStream(getServerInsertedMetadata))// Insert the inlined data (Flight data, form state, etc.) stream into the HTML
.pipeThrough(createFlightDataInjectionTransformStream(inlinedDataStream, true))// Close tags should always be deferred to the end
.pipeThrough(createMoveSuffixStream());
}
export async function continueDynamicHTMLResume(renderStream, { delayDataUntilFirstHtmlChunk, inlinedDataStream, getServerInsertedHTML, getServerInsertedMetadata }) {
return renderStream// Buffer everything to avoid flushing too frequently
.pipeThrough(createBufferedTransformStream())// Insert generated tags to head
.pipeThrough(createHeadInsertionTransformStream(getServerInsertedHTML))// Transform metadata
.pipeThrough(createMetadataTransformStream(getServerInsertedMetadata))// Insert the inlined data (Flight data, form state, etc.) stream into the HTML
.pipeThrough(createFlightDataInjectionTransformStream(inlinedDataStream, delayDataUntilFirstHtmlChunk))// Close tags should always be deferred to the end
.pipeThrough(createMoveSuffixStream());
}
export function createDocumentClosingStream() {
return streamFromString(CLOSE_TAG);
}
//# sourceMappingURL=node-web-streams-helper.js.map