Replace server chunk handling in outputPath with chunkFilename

[sam3d]

Fixes #29485 #29362

The problem

Using chunks in the output.path directory and then using ../ to recurse up a directory for ordinary files breaks webassemblyModuleFilename, as it outputs into the chunks directory but then looks for the webpack module at the root of server. This renders it unable to find the file.

The fix

Use the chunkFilename to handle the chunks subdirectory instead, and replace the relative path handlers introduced with what they had before

[ijjk]

Failing test suites

Commit: b417ded

test/e2e/prerender.test.ts

• Prerender > should output traces

Expand output

● Prerender › should output traces

expect(received).toBe(expected) // Object.is equality

Expected: true
Received: false

  1380 |               routeKeys: {
  1381 |                 lang: 'lang',
> 1382 |               },
       |                 ^
  1383 |             },
  1384 |             {
  1385 |               namedDataRouteRegex: `^/_next/data/${escapeRegex(

  at Object.<anonymous> (e2e/prerender.test.ts:1382:24)

test/integration/gssp-ssr-change-reloading/test/index.test.js

• GS(S)P Server-Side Change Reloading > should not reload page when client-side is changed too GSSP
• GS(S)P Server-Side Change Reloading > should update page when getServerSideProps is changed only

Expand output

● GS(S)P Server-Side Change Reloading › should not reload page when client-side is changed too GSSP

Failed to replace content.

Pattern: change me

Content: export default function Gssp(props) {
  return (
    <>
      <p id="change">changed</p>
      <p id="props">{JSON.stringify(props)}</p>
    </>
  )
}

export const getServerSideProps = ({ params }) => {
  const count = 2

  return {
    props: {
      count,
      params,
      random: Math.random(),
    },
  }
}

  467 |     } else if (typeof pattern === 'string') {
  468 |       if (!currentContent.includes(pattern)) {
> 469 |         throw new Error(
      |               ^
  470 |           `Failed to replace content.\n\nPattern: ${pattern}\n\nContent: ${currentContent}`
  471 |         )
  472 |       }

  at File.replace (lib/next-test-utils.js:469:15)
  at Object.<anonymous> (integration/gssp-ssr-change-reloading/test/index.test.js:163:63)
      at runMicrotasks (<anonymous>)

● GS(S)P Server-Side Change Reloading › should update page when getServerSideProps is changed only

expect(received).toBe(expected) // Object.is equality

Expected: 1
Received: 2

  185 |       async () =>
  186 |         JSON.parse(await browser.elementByCss('#props').text()).count + '',
> 187 |       '1'
      |          ^
  188 |     )
  189 |   })
  190 | })

  at Object.<anonymous> (integration/gssp-ssr-change-reloading/test/index.test.js:187:10)

✓ stest/integration/production/test/index.test.js

• Production Usage > should output traces

Expand output

● Production Usage › should output traces

expect(received).toBe(expected) // Object.is equality

Expected: true
Received: false

  156 |         expect(
  157 |           check.tests.every((item) => files.some((file) => item.test(file)))
> 158 |         ).toBe(true)
      |           ^
  159 |
  160 |         if (sep === '/') {
  161 |           expect(

  at Object.<anonymous> (integration/production/test/index.test.js:158:11)

[ijjk]

Stats from current PR

Default Build (Decrease detected ✓)

General Overall decrease ✓

	vercel/next.js canary	sam3d/next.js wasm-chunks-fix	Change
buildDuration	14.8s	15s	⚠️ +227ms
buildDurationCached	3.8s	3.7s	-50ms
nodeModulesSize	183 MB	183 MB	-739 B

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	sam3d/next.js wasm-chunks-fix	Change
/ failed reqs	0	0	✓
/ total time (seconds)	3.33	3.259	-0.07
/ avg req/sec	750.74	767.08	+16.34
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.552	1.586	⚠️ +0.03
/error-in-render avg req/sec	1610.72	1576.1	⚠️ -34.62

Client Bundles (main, webpack, commons)

	vercel/next.js canary	sam3d/next.js wasm-chunks-fix	Change
779.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42.2 kB	42.2 kB	✓
main-HASH.js gzip	26.9 kB	26.9 kB	✓
webpack-HASH.js gzip	1.45 kB	1.45 kB	✓
Overall change	70.8 kB	70.8 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	sam3d/next.js wasm-chunks-fix	Change
polyfills-a4..dd70.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	sam3d/next.js wasm-chunks-fix	Change
_app-HASH.js gzip	977 B	977 B	✓
_error-HASH.js gzip	194 B	194 B	✓
amp-HASH.js gzip	311 B	311 B	✓
css-HASH.js gzip	328 B	328 B	✓
dynamic-HASH.js gzip	2.67 kB	2.67 kB	✓
head-HASH.js gzip	351 B	351 B	✓
hooks-HASH.js gzip	918 B	918 B	✓
image-HASH.js gzip	4.15 kB	4.15 kB	✓
index-HASH.js gzip	260 B	260 B	✓
link-HASH.js gzip	1.66 kB	1.66 kB	✓
routerDirect..HASH.js gzip	320 B	320 B	✓
script-HASH.js gzip	386 B	386 B	✓
withRouter-HASH.js gzip	319 B	319 B	✓
bb14e60e810b..30f.css gzip	125 B	125 B	✓
Overall change	13 kB	13 kB	✓

Client Build Manifests

	vercel/next.js canary	sam3d/next.js wasm-chunks-fix	Change
_buildManifest.js gzip	494 B	494 B	✓
Overall change	494 B	494 B	✓

Rendered Page Sizes

	vercel/next.js canary	sam3d/next.js wasm-chunks-fix	Change
index.html gzip	539 B	539 B	✓
link.html gzip	551 B	551 B	✓
withRouter.html gzip	533 B	533 B	✓
Overall change	1.62 kB	1.62 kB	✓

---

Default Build with SWC (Decrease detected ✓)

General Overall decrease ✓

	vercel/next.js canary	sam3d/next.js wasm-chunks-fix	Change
buildDuration	7.8s	7.7s	-84ms
buildDurationCached	3.9s	3.7s	-145ms
nodeModulesSize	183 MB	183 MB	-739 B

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	sam3d/next.js wasm-chunks-fix	Change
/ failed reqs	0	0	✓
/ total time (seconds)	3.165	3.261	⚠️ +0.1
/ avg req/sec	789.96	766.61	⚠️ -23.35
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.471	1.552	⚠️ +0.08
/error-in-render avg req/sec	1699.07	1610.57	⚠️ -88.5

Client Bundles (main, webpack, commons)

	vercel/next.js canary	sam3d/next.js wasm-chunks-fix	Change
675-HASH.js gzip	13.8 kB	13.8 kB	✓
770.HASH.js gzip	178 B	178 B	✓
framework-HASH.js gzip	50.7 kB	50.7 kB	✓
main-HASH.js gzip	34.9 kB	34.9 kB	✓
webpack-HASH.js gzip	1.64 kB	1.64 kB	✓
Overall change	101 kB	101 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	sam3d/next.js wasm-chunks-fix	Change
polyfills-a4..dd70.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	sam3d/next.js wasm-chunks-fix	Change
_app-HASH.js gzip	1.33 kB	1.33 kB	✓
_error-HASH.js gzip	180 B	180 B	✓
amp-HASH.js gzip	315 B	315 B	✓
css-HASH.js gzip	331 B	331 B	✓
dynamic-HASH.js gzip	2.79 kB	2.79 kB	✓
head-HASH.js gzip	356 B	356 B	✓
hooks-HASH.js gzip	637 B	637 B	✓
image-HASH.js gzip	573 B	573 B	✓
index-HASH.js gzip	262 B	262 B	✓
link-HASH.js gzip	2.2 kB	2.2 kB	✓
routerDirect..HASH.js gzip	326 B	326 B	✓
script-HASH.js gzip	393 B	393 B	✓
withRouter-HASH.js gzip	322 B	322 B	✓
bb14e60e810b..30f.css gzip	125 B	125 B	✓
Overall change	10.1 kB	10.1 kB	✓

Client Build Manifests

	vercel/next.js canary	sam3d/next.js wasm-chunks-fix	Change
_buildManifest.js gzip	511 B	511 B	✓
Overall change	511 B	511 B	✓

Rendered Page Sizes

	vercel/next.js canary	sam3d/next.js wasm-chunks-fix	Change
index.html gzip	539 B	539 B	✓
link.html gzip	551 B	551 B	✓
withRouter.html gzip	532 B	532 B	✓
Overall change	1.62 kB	1.62 kB	✓

Commit: b417ded

[sam3d]

@sokra I believe you originally made the change for this in 445dba1, is it expected that the webassemblyModuleFilename will no longer pull from the real directory?

[sokra]

The ../ is a workaround for node-file-trace to only include files in the chunks directory.
There work towards improving that by moving node-file-trace into next.js, which would make that workaround unnecessary.
Maybe we can disable the workaround when the experimental flag is enabled? cc @ijjk

[sam3d]

@ijjk considering that #43677 has been merged, is there anything further we can do here?