fix: SSR invariant dehydration errors with bun

[Cyenoch]

Related: #3989

The script assigned to __TSR_SSR__.dehydrated appears outside the </html> tag. When the entry script /_build/assets/client-BJoNZ2zg.js is cached locally by the browser, even if the entry script is async, the script outside the html may still be executed after the entry script.

router/packages/start-server-core/src/transformStreamWithRouter.ts

Line 171 in 72ffeb4

const text = decodeChunk(chunk.value)

Problems occur when text is complete HTML

router/packages/start-server-core/src/transformStreamWithRouter.ts

Lines 174 to 175 in 72ffeb4

	const bodyEndMatch = chunkString.match(patternBodyEnd)
	const htmlEndMatch = chunkString.match(patternHtmlEnd)

router/packages/start-server-core/src/transformStreamWithRouter.ts

Line 190 in 72ffeb4

const remaining = chunkString.slice(index + headTag.length)

bodyEndMatch is assigned before the !headStarted branch processes chunkString.

router/packages/start-server-core/src/transformStreamWithRouter.ts

Line 216 in 72ffeb4

chunkString.slice(0, bodyEndIndex) + getBufferedRouterStream(),

The length of bodyEndIndex obtained here will exceed the length of the modified chunkString, resulting in <script> being appended after </html>

The solution is to move bodyEndMatch and htmlEndMatch to after the chunkString change.

[nx-cloud]

View your CI Pipeline Execution ↗ for commit 846bf44.

Command	Status	Duration	Result
nx affected --targets=test:eslint,test:unit,tes...	✅ Succeeded	1m 37s	View ↗

---

☁️ Nx Cloud last updated this comment at 2025-05-25 09:36:29 UTC

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commit: 846bf44

[Cyenoch]

I think it would be better if ensure that all tsr-once is before the entry script

[schiller-manuel]

I think it would be better if ensure that all tsr-once is before the entry script

that's not possible as values might stream in later

[schiller-manuel]

how can I reproduce the issue locally?