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[Fizz] Enable the progressiveChunkSize option (#33027)

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Since the very beginning we have had the `progressiveChunkSize` option
but we never actually took advantage of it because we didn't count the
bytes that we emitted. This starts counting the bytes by taking a pass
over the added chunks each time a segment completes.

That allows us to outline a Suspense boundary to stream in late even if
it is already loaded by the time that back-pressure flow and in a
`prerender`. Meaning it gets inserted with script.

The effect can be seen in the fixture where if you have large HTML
content that can block initial paint (thanks to
[`rel="expect"`](https://github.com/facebook/react/pull/33016) but also
nested Suspense boundaries). Before this fix, the paint would be blocked
until the large content loaded. This lets us paint the fallback first in
the case that the raw bytes of the content takes a while to download.

You can set it to `Infinity` to opt-out. E.g. if you want to ensure
there's never any scripts. It's always set to `Infinity` in
`renderToHTML` and the legacy `renderToString`.

One downside is that if we might choose to outline a boundary, we need
to let its fallback complete.

We don't currently discount the size of the fallback but really just
consider them additive even though in theory the fallback itself could
also add significant size or even more than the content. It should maybe
really be considered the delta but that would require us to track the
size of the fallback separately which is tricky.

One problem with the current heuristic is that we just consider the size
of the boundary content itself down to the next boundary. If you have a
lot of small boundaries adding up, it'll never kick in. I intend to
address that in a follow up.
This commit is contained in:
Sebastian Markbåge 2025-04-25 16:10:53 -04:00 committed by GitHub
parent 89e8875ec4
commit 8e9a5fc6c1
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GPG Key ID: B5690EEEBB952194
5 changed files with 309 additions and 16 deletions
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8
fixtures/ssr/src/components/Chrome.js
View File

@ -4,6 +4,8 @@ import Theme, {ThemeToggleButton} from './Theme';
import './Chrome.css';
import LargeContent from './LargeContent';
export default class Chrome extends Component {
state = {theme: 'light'};
render() {
@ -25,7 +27,6 @@ export default class Chrome extends Component {
/>
<Suspense fallback="Loading...">
<Theme.Provider value={this.state.theme}>
{this.props.children}
<div>
<ThemeToggleButton
onChange={theme => {
@ -35,9 +36,14 @@ export default class Chrome extends Component {
}}
/>
</div>
{this.props.children}
</Theme.Provider>
</Suspense>
<p>This should appear in the first paint.</p>
<Suspense fallback="Loading...">
<p>This content should not block paint.</p>
<LargeContent />
</Suspense>
<script
dangerouslySetInnerHTML={{
__html: `assetManifest = ${JSON.stringify(assets)};`,

243
fixtures/ssr/src/components/LargeContent.js Normal file
View File

@ -0,0 +1,243 @@
import React, {Fragment} from 'react';
export default function LargeContent() {
return (
<Fragment>
<p>
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris
porttitor tortor ac lectus faucibus, eget eleifend elit hendrerit.
Integer porttitor nisi in leo congue rutrum. Morbi sed ante posuere,
aliquam lorem ac, imperdiet orci. Duis malesuada gravida pharetra. Cras
facilisis arcu diam, id dictum lorem imperdiet a. Suspendisse aliquet
tempus tortor et ultricies. Aliquam libero velit, posuere tempus ante
sed, pellentesque tincidunt lorem. Nullam iaculis, eros a varius
aliquet, tortor felis tempor metus, nec cursus felis eros aliquam nulla.
Vivamus ut orci sed mauris congue lacinia. Cras eget blandit neque.
Pellentesque a massa in turpis ullamcorper volutpat vel at massa. Sed
ante est, auctor non diam non, vulputate ultrices metus. Maecenas dictum
fermentum quam id aliquam. Donec porta risus vitae pretium posuere.
Fusce facilisis eros in lacus tincidunt congue.
</p>
<p>
Pellentesque habitant morbi tristique senectus et netus et malesuada
fames ac turpis egestas. Phasellus dolor ante, iaculis vel nisl vitae,
ornare ornare orci. Praesent sit amet lobortis sapien. Suspendisse
pharetra posuere libero ut dapibus. Donec condimentum ante urna. Aliquam
laoreet tincidunt lacus, sed interdum tortor dapibus elementum. Nam sed
faucibus lorem. Suspendisse finibus, velit sed molestie finibus, risus
purus mollis ante, sit amet aliquet sapien nulla ut nibh. In eget ligula
metus. Duis in purus mattis, blandit magna nec, dictum nunc.
</p>
<p>
Sed convallis magna id tortor blandit dictum. Suspendisse in porttitor
neque. Integer quis metus consequat, rutrum est sit amet, finibus justo.
In hac habitasse platea dictumst. Nullam sagittis, risus sed vehicula
porta, sapien elit ultrices nibh, vel luctus odio tortor et ante. Sed
porta enim in hendrerit tristique. Pellentesque id feugiat libero, sit
amet tempor enim. Proin gravida nisl justo, vel ornare dolor bibendum
ac. Mauris scelerisque mattis facilisis. Praesent sodales augue mollis
orci vulputate aliquet. Mauris molestie luctus neque, sed congue elit
congue ut. Cras quis tortor augue. In auctor nulla vel turpis dapibus
egestas. Phasellus consequat rhoncus nisi sed dignissim. Quisque varius
justo non ex lobortis finibus cursus nec justo. Nulla erat neque,
commodo et sem convallis, tristique faucibus odio.
</p>
<p>
Ut condimentum volutpat sem, id accumsan augue placerat vel. Donec ac
efficitur turpis. Suspendisse pretium odio euismod sapien bibendum, sed
tempus est condimentum. Etiam nisl magna, consequat at ullamcorper at,
sollicitudin eu eros. In mattis ligula arcu. Sed eu consectetur turpis,
id molestie ligula. Vestibulum et venenatis enim. Donec condimentum
vitae nisi et placerat. Sed fringilla vehicula egestas. Proin
consectetur, nibh non ornare scelerisque, diam lorem cursus lectus, ut
mattis mauris purus id mi. Curabitur non ligula sit amet augue molestie
vulputate. Donec maximus magna at volutpat aliquet. Pellentesque
dignissim nulla eget odio eleifend tincidunt. Etiam diam lorem, ornare
vel scelerisque vel, iaculis id risus. Donec aliquet aliquam felis, ac
vehicula lacus suscipit vitae. Morbi eu ligula elit.
</p>
<p>
Praesent pellentesque, libero ut faucibus tempor, purus elit consequat
metus, in ornare nulla lectus at erat. Duis quis blandit turpis. Fusce
at ligula rutrum metus molestie tempor sit amet eu justo. Maecenas
tincidunt nisl nunc. Morbi ac metus tempor, pretium arcu vel, dapibus
velit. Nulla convallis ligula at porta mollis. Duis magna ante, mollis
eget nibh in, congue tempor dolor. Sed tincidunt sagittis arcu, in
ultricies neque tempor non. Suspendisse eget nunc neque. Nulla sit amet
odio volutpat, maximus purus id, dictum metus. Integer consequat, orci
nec ullamcorper porta, mauris libero vestibulum ipsum, nec tempor tellus
enim non nunc. Quisque nisl risus, dapibus sit amet purus nec, aliquam
finibus metus. Nullam condimentum urna viverra finibus cursus. Proin et
sollicitudin tellus, porta fermentum felis. Maecenas ac turpis sed dui
condimentum interdum sed sed erat. Mauris ut dignissim erat.
</p>
<p>
Proin varius porta dui, id fringilla elit lobortis eget. Integer at
metus elementum, efficitur eros id, euismod est. Morbi vestibulum nibh
ac leo luctus sagittis. Praesent rhoncus, risus sit amet mattis dictum,
diam sapien tempor neque, vel dignissim nulla neque eget ex. Nam
sollicitudin metus quis ullamcorper dapibus. Nam tristique euismod
efficitur. Pellentesque rhoncus vel sem eget lacinia. Pellentesque
volutpat velit ac dignissim luctus. Vivamus euismod tortor at ligula
mattis porta. Vestibulum ante ipsum primis in faucibus orci luctus et
ultrices posuere cubilia curae;
</p>
<p>
Proin blandit vulputate efficitur. Pellentesque sit amet porta odio.
Nunc pulvinar varius rhoncus. Mauris fermentum leo a imperdiet pretium.
Mauris scelerisque justo vel ante egestas, eget tempus neque malesuada.
Sed dictum ex vel justo dignissim, aliquam commodo diam rutrum. Integer
dignissim est ullamcorper augue laoreet consectetur id at diam. Vivamus
molestie blandit urna, eget pulvinar augue dictum vestibulum. Duis
maximus bibendum mauris, ut ultricies elit rhoncus eu. Praesent gravida
placerat mauris. Praesent tempor ipsum at nibh rhoncus sagittis. Duis
non sem turpis. Quisque et metus leo. Sed eu purus lorem. Pellentesque
dictum metus sed leo viverra interdum. Maecenas vel tincidunt mi.
</p>
<p>
Praesent consequat dapibus pellentesque. Fusce at enim id mauris laoreet
commodo. Nullam ut mauris euismod, rhoncus tellus vel, facilisis diam.
Aenean porta faucibus augue, a iaculis massa iaculis in. Praesent vel
metus purus. Etiam quis augue eget orci lobortis eleifend ac ut lorem.
Aenean non orci quis nisi molestie maximus. Mauris interdum, eros et
aliquam aliquam, lectus diam pharetra velit, in condimentum odio eros
non quam. Praesent bibendum pretium turpis vitae tristique. Mauris
convallis, massa ut fermentum fermentum, libero orci tempus ipsum,
malesuada ultrices metus sapien placerat lectus. Ut fringilla arcu nec
lorem ultrices mattis. Etiam id tortor feugiat magna gravida gravida.
Morbi aliquam, mi ac pellentesque mattis, erat ex venenatis erat, a
vestibulum eros turpis quis metus. Pellentesque tempus justo in ligula
ultricies porta. Phasellus congue felis sit amet dolor tristique
finibus. Nunc eget eros non est ultricies vestibulum.
</p>
<p>
Donec efficitur ligula quis odio tincidunt tristique. Duis urna dolor,
hendrerit quis enim at, accumsan auctor turpis. Vivamus ante lorem,
maximus vitae suscipit ut, congue eget velit. Maecenas sed ligula erat.
Aliquam mollis purus at nisi porta suscipit in ut magna. Vivamus a
turpis nec tellus egestas suscipit nec ornare nisi. Donec vestibulum
libero quis ex suscipit, sit amet luctus leo gravida.
</p>
<p>
Praesent pharetra dolor elit, sed volutpat lorem rhoncus non. Etiam a
neque ut velit dignissim sodales. Vestibulum neque risus, condimentum
nec consectetur vitae, ultricies ut sapien. Integer iaculis at urna sit
amet malesuada. Integer tincidunt, felis ac vulputate semper, velit leo
facilisis lorem, quis aliquet leo dui id lorem. Morbi non quam quis nisl
sagittis consequat nec vitae libero. Nunc molestie pretium libero, eu
eleifend nibh feugiat sed. Ut in bibendum diam, sit amet vehicula risus.
Nam ornare ac nisi ac euismod. Nullam id egestas nulla. Etiam porta
commodo ante sit amet pellentesque. Suspendisse eleifend purus in urna
euismod auctor non vel nisi. Suspendisse rutrum est nunc, sit amet
lacinia lacus dictum eget. Pellentesque habitant morbi tristique
senectus et netus et malesuada fames ac turpis egestas. Morbi a blandit
diam.
</p>
<p>
Donec eget efficitur sapien. Suspendisse diam lacus, varius eu interdum
et, congue ac justo. Proin ipsum odio, suscipit elementum mauris sed,
porttitor congue est. Cras dapibus dictum ante, vitae gravida elit
venenatis sed. Sed massa sem, posuere ut enim sit amet, vestibulum
condimentum nibh. Pellentesque pulvinar sodales lacinia. Proin id
pretium sapien, non convallis nulla. In mollis tincidunt sem et
porttitor.
</p>
<p>
Integer at sollicitudin sem. Suspendisse sed semper orci. Nulla at nibh
nec risus suscipit posuere egestas vitae enim. Nullam mauris justo,
mattis vel laoreet non, finibus nec nisl. Cras iaculis ultrices nibh,
non commodo eros aliquam non. Sed vitae mollis dui, at maximus metus. Ut
vestibulum, enim ut lobortis vulputate, lorem urna congue elit, non
dictum odio lorem eget velit. Morbi eleifend id ligula vitae vulputate.
Suspendisse ac laoreet justo. Proin eu mattis diam.
</p>
<p>
Nunc in ex quis enim ullamcorper scelerisque eget ac eros. Class aptent
taciti sociosqu ad litora torquent per conubia nostra, per inceptos
himenaeos. Aliquam turpis dui, egestas a rhoncus non, fermentum in
tellus. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices
posuere cubilia curae; Aenean non risus arcu. Nam ultricies lacinia
volutpat. Class aptent taciti sociosqu ad litora torquent per conubia
nostra, per inceptos himenaeos. Lorem ipsum dolor sit amet, consectetur
adipiscing elit.
</p>
<p>
Aliquam a felis leo. Proin lorem ipsum, congue eu cursus in, rhoncus ut
libero. Vestibulum sit amet consequat nunc. Ut eleifend lobortis lacus,
vel molestie metus viverra eget. Nullam suscipit eu magna scelerisque
suscipit. Donec dictum in diam nec lacinia. Mauris pellentesque ex ut
purus facilisis, eget placerat turpis semper. Sed dapibus lorem ante, et
malesuada dui eleifend ac. Sed diam felis, semper ac nulla vel, posuere
ultricies ante.
</p>
<p>
Nunc elementum odio sapien, sit amet vulputate lorem varius at. Fusce
non sapien vitae lorem aliquam pretium sit amet congue dolor. Nunc quis
tortor luctus, pretium ex a, tincidunt urna. Aliquam fermentum massa a
erat pharetra varius. Curabitur at auctor dui. Sed posuere pellentesque
massa, vel bibendum urna dictum non. Fusce eget rhoncus urna. Maecenas
sed lectus tellus. Pellentesque convallis dapibus nisl vitae venenatis.
Quisque ornare a dolor ac pharetra. Nam cursus, mi a lacinia accumsan,
felis erat fringilla magna, ac mattis nunc ante a orci.
</p>
<p>
Nunc vel tortor euismod, commodo tortor non, aliquam nisi. Maecenas
tempus mollis velit non suscipit. Mauris sit amet dolor sed ex fringilla
varius. Suspendisse vel cursus risus. Vivamus pharetra massa nec dolor
aliquam feugiat. Fusce finibus enim commodo, scelerisque ante eu,
laoreet ex. Curabitur placerat magna quis imperdiet lacinia. Etiam
lectus mauris, porttitor ac lacinia sed, posuere eget lacus. Mauris
vulputate mattis imperdiet. Nunc id aliquet libero, vitae hendrerit
purus. Praesent vestibulum urna ac egestas tempor. In molestie, nunc sit
amet sagittis dapibus, ligula enim fermentum mi, lacinia molestie eros
dui in tortor. Mauris fermentum pulvinar faucibus. Curabitur laoreet
eleifend purus, non tincidunt tortor gravida nec. Nam eu lectus congue,
commodo libero et, porttitor est. Nullam tincidunt, nisi eu congue
congue, magna justo commodo massa, nec efficitur dui lectus non sem.
</p>
<p>
Nullam vehicula, ipsum quis lacinia tristique, elit nulla dignissim
augue, at pulvinar metus justo ac magna. Nullam nec nunc ac sapien
mollis cursus eu ac enim. Pellentesque a pharetra erat. Ut tempor magna
nisi, accumsan blandit lectus volutpat nec. Vivamus vel lorem nec eros
blandit dictum eget ac diam. Nulla nec turpis dolor. Morbi eu euismod
libero. Nam ut tortor at arcu porta tincidunt. In gravida ligula
fringilla ornare imperdiet. Nulla scelerisque ante erat, efficitur
dictum metus ullamcorper vel. Nam ac purus metus. Maecenas eget tempus
nulla. Ut magna lorem, efficitur ut ex a, semper aliquam magna. Praesent
lobortis, velit ac posuere mattis, justo est accumsan turpis, id
sagittis felis mi in lacus.
</p>
<p>
Aenean est mi, semper nec sem at, malesuada consectetur nunc. Aenean
consequat sem quis sem consequat, non aliquam est placerat. Cras
malesuada magna neque, et pellentesque nibh consequat at. Sed interdum
velit et ex interdum, vel lobortis ante vestibulum. Nam placerat lectus
eu commodo efficitur. Pellentesque in nunc ac massa porttitor eleifend
ut efficitur sem. Aenean at magna auctor, posuere augue in, ultrices
arcu. Praesent dignissim augue ex, malesuada maximus metus interdum a.
Proin nec odio in nulla vestibulum.
</p>
<p>
Aenean est mi, semper nec sem at, malesuada consectetur nunc. Aenean
consequat sem quis sem consequat, non aliquam est placerat. Cras
malesuada magna neque, et pellentesque nibh consequat at. Sed interdum
velit et ex interdum, vel lobortis ante vestibulum. Nam placerat lectus
eu commodo efficitur. Pellentesque in nunc ac massa porttitor eleifend
ut efficitur sem. Aenean at magna auctor, posuere augue in, ultrices
arcu. Praesent dignissim augue ex, malesuada maximus metus interdum a.
Proin nec odio in nulla vestibulum.
</p>
<p>
Aenean est mi, semper nec sem at, malesuada consectetur nunc. Aenean
consequat sem quis sem consequat, non aliquam est placerat. Cras
malesuada magna neque, et pellentesque nibh consequat at. Sed interdum
velit et ex interdum, vel lobortis ante vestibulum. Nam placerat lectus
eu commodo efficitur. Pellentesque in nunc ac massa porttitor eleifend
ut efficitur sem. Aenean at magna auctor, posuere augue in, ultrices
arcu. Praesent dignissim augue ex, malesuada maximus metus interdum a.
Proin nec odio in nulla vestibulum.
</p>
</Fragment>
);
}

2
packages/react-noop-renderer/src/ReactNoopServer.js vendored
View File

@ -98,6 +98,8 @@ const ReactNoopServer = ReactFizzServer({
closeWithError(destination: Destination, error: mixed): void {},
flushBuffered(destination: Destination): void {},
byteLengthOfChunk: null,
getChildFormatContext(): null {
return null;
},

66
packages/react-server/src/ReactFizzServer.js vendored
View File

@ -50,6 +50,7 @@ import {
flushBuffered,
close,
closeWithError,
byteLengthOfChunk,
} from './ReactServerStreamConfig';
import {
writeCompletedRoot,
@ -348,6 +349,7 @@ export opaque type Request = {
pendingRootTasks: number, // when this reaches zero, we've finished at least the root boundary.
completedRootSegment: null | Segment, // Completed but not yet flushed root segments.
completedPreambleSegments: null | Array<Array<Segment>>, // contains the ready-to-flush segments that make up the preamble
byteSize: number, // counts the number of bytes accumulated in the shell
abortableTasks: Set<Task>,
pingedTasks: Array<Task>, // High priority tasks that should be worked on first.
// Queues to flush in order of priority
@ -398,6 +400,13 @@ type Preamble = PreambleState;
// 500 * 1024 / 8 * .8 * 0.5 / 2
const DEFAULT_PROGRESSIVE_CHUNK_SIZE = 12800;
function isEligibleForOutlining(
request: Request,
boundary: SuspenseBoundary,
): boolean {
return boundary.byteSize > request.progressiveChunkSize;
}
function defaultErrorHandler(error: mixed) {
if (
typeof error === 'object' &&
@ -447,6 +456,7 @@ function RequestInstance(
this.pendingRootTasks = 0;
this.completedRootSegment = null;
this.completedPreambleSegments = null;
this.byteSize = 0;
this.abortableTasks = abortSet;
this.pingedTasks = pingedTasks;
this.clientRenderedBoundaries = ([]: Array<SuspenseBoundary>);
@ -1235,6 +1245,7 @@ function renderSuspenseBoundary(
boundarySegment.textEmbedded,
);
boundarySegment.status = COMPLETED;
finishedSegment(request, parentBoundary, boundarySegment);
} catch (thrownValue: mixed) {
if (request.status === ABORTING) {
boundarySegment.status = ABORTED;
@ -1301,20 +1312,24 @@ function renderSuspenseBoundary(
contentRootSegment.textEmbedded,
);
contentRootSegment.status = COMPLETED;
finishedSegment(request, newBoundary, contentRootSegment);
queueCompletedSegment(newBoundary, contentRootSegment);
if (newBoundary.pendingTasks === 0 && newBoundary.status === PENDING) {
// This must have been the last segment we were waiting on. This boundary is now complete.
// Therefore we won't need the fallback. We early return so that we don't have to create
// the fallback.
newBoundary.status = COMPLETED;
if (request.pendingRootTasks === 0 && task.blockedPreamble) {
// The root is complete and this boundary may contribute part of the preamble.
// We eagerly attempt to prepare the preamble here because we expect most requests
// to have few boundaries which contribute preambles and it allow us to do this
// preparation work during the work phase rather than the when flushing.
preparePreamble(request);
// Therefore we won't need the fallback. We early return so that we don't have to create
// the fallback. However, if this boundary ended up big enough to be eligible for outlining
// we can't do that because we might still need the fallback if we outline it.
if (!isEligibleForOutlining(request, newBoundary)) {
if (request.pendingRootTasks === 0 && task.blockedPreamble) {
// The root is complete and this boundary may contribute part of the preamble.
// We eagerly attempt to prepare the preamble here because we expect most requests
// to have few boundaries which contribute preambles and it allow us to do this
// preparation work during the work phase rather than the when flushing.
preparePreamble(request);
}
return;
}
return;
}
} catch (thrownValue: mixed) {
newBoundary.status = CLIENT_RENDERED;
@ -2451,6 +2466,7 @@ function resumeNode(
renderTask.blockedSegment = resumedSegment;
renderNode(request, task, node, childIndex);
resumedSegment.status = COMPLETED;
finishedSegment(request, blockedBoundary, resumedSegment);
if (blockedBoundary === null) {
request.completedRootSegment = resumedSegment;
} else {
@ -4272,6 +4288,27 @@ function queueCompletedSegment(
}
}
function finishedSegment(
request: Request,
boundary: Root | SuspenseBoundary,
segment: Segment,
) {
if (byteLengthOfChunk !== null) {
// Count the bytes of all the chunks of this segment.
const chunks = segment.chunks;
let segmentByteSize = 0;
for (let i = 0; i < chunks.length; i++) {
segmentByteSize += byteLengthOfChunk(chunks[i]);
}
// Accumulate on the parent boundary to power heuristics.
if (boundary === null) {
request.byteSize += segmentByteSize;
} else {
boundary.byteSize += segmentByteSize;
}
}
}
function finishedTask(
request: Request,
boundary: Root | SuspenseBoundary,
@ -4318,9 +4355,13 @@ function finishedTask(
// This needs to happen after we read the parentFlushed flags because aborting can finish
// work which can trigger user code, which can start flushing, which can change those flags.
// If the boundary was POSTPONED, we still need to finish the fallback first.
// If the boundary is eligible to be outlined during flushing we can't cancel the fallback
// since we might need it when it's being outlined.
if (boundary.status === COMPLETED) {
boundary.fallbackAbortableTasks.forEach(abortTaskSoft, request);
boundary.fallbackAbortableTasks.clear();
if (!isEligibleForOutlining(request, boundary)) {
boundary.fallbackAbortableTasks.forEach(abortTaskSoft, request);
boundary.fallbackAbortableTasks.clear();
}
if (
request.pendingRootTasks === 0 &&
@ -4418,6 +4459,7 @@ function retryRenderTask(
task.abortSet.delete(task);
segment.status = COMPLETED;
finishedSegment(request, task.blockedBoundary, segment);
finishedTask(request, task.blockedBoundary, segment);
} catch (thrownValue: mixed) {
resetHooksState();
@ -4929,7 +4971,7 @@ function flushSegment(
flushSubtree(request, destination, segment, hoistableState);
return writeEndPendingSuspenseBoundary(destination, request.renderState);
} else if (boundary.byteSize > request.progressiveChunkSize) {
} else if (isEligibleForOutlining(request, boundary)) {
// This boundary is large and will be emitted separately so that we can progressively show
// other content. We add it to the queue during the flush because we have to ensure that
// the parent flushes first so that there's something to inject it into.

6
packages/react-server/src/ReactServerStreamConfigFB.js vendored
View File

@ -60,9 +60,9 @@ export function typedArrayToBinaryChunk(
throw new Error('Not implemented.');
}
export function byteLengthOfChunk(chunk: Chunk | PrecomputedChunk): number {
throw new Error('Not implemented.');
}
export const byteLengthOfChunk:
| null
| ((chunk: Chunk | PrecomputedChunk) => number) = null;
export function byteLengthOfBinaryChunk(chunk: BinaryChunk): number {
throw new Error('Not implemented.');