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Add Promise as a child test to Flight fixture #28778

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merged 3 commits into from
Apr 8, 2024
Merged

Add Promise as a child test to Flight fixture #28778

merged 3 commits into from
Apr 8, 2024

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eps1lon
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@eps1lon eps1lon commented Apr 8, 2024 •
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Adds a test for promise as a child that was fixed by #28284. Since the fix only included tests for React.Children I also added another regression test based on the original bug report in #27247.

Test plan

I can't repro this in our unit test suite so I use the Flight fixture which fails on any console error.

  • Reverting the fix fails CI: https://app.circleci.com/pipelines/github/facebook/react/51990/workflows/d89bc4f1-0ae0-4694-a7ed-a922ec4a7c66/jobs/828188 
     Error: expect(received).toEqual(expected) // deep equality

 - Expected  -  1
 + Received  + 38

 - Array []
 + Array [
 +   "Error: Hydration failed because the server rendered HTML didn't match the client. As a result this tree will be regenerated on the client. This can happen if a SSR-ed Client Component used:
 +
 + - A server/client branch `if (typeof window !== 'undefined')`.
 + - Variable input such as `Date.now()` or `Math.random()` which changes each time it's called.
 + - Date formatting in a user's locale which doesn't match the server.
 + - External changing data without sending a snapshot of it along with the HTML.
 + - Invalid HTML tag nesting.
 +
 + It can also happen if the client has a browser extension installed which messes with the HTML before React loaded.
 +
 + https://react.dev/link/hydration-mismatch
 +
 +   <Shell data={[...]}>
 +     <link>
 +     <App>
 +       <html lang=\"en\">
 +         <head>
 +         <body>
 +           <Container>
 +             <div>
 +               <h1>
 +               <Suspense fallback={null}>
 + +               <div data-testid=\"promise-as-a-child-test\">
 + -               Promise as a child hydrates without errors: 
 +               ...
 +
 +     at throwOnHydrationMismatch (http://localhost:3000/static/js/bundle.js:20903:19)
 +     at tryToClaimNextHydratableInstance (http://localhost:3000/static/js/bundle.js:20948:9)
 +     at updateHostComponent$1 (http://localhost:3000/static/js/bundle.js:30288:9)
 +     at beginWork (http://localhost:3000/static/js/bundle.js:31858:18)
 +     at replaySuspendedUnitOfWork (http://localhost:3000/static/js/bundle.js:38668:20)
 +     at renderRootConcurrent (http://localhost:3000/static/js/bundle.js:38366:21)
 +     at performConcurrentWorkOnRoot (http://localhost:3000/static/js/bundle.js:37342:42)
 +     at workLoop (http://localhost:3000/static/js/bundle.js:49707:38)
 +     at flushWork (http://localhost:3000/static/js/bundle.js:49677:18)
 +     at MessagePort.performWorkUntilDeadline (http://localhost:3000/static/js/bundle.js:49975:25)",
 + ]

   19 |
   20 |   await expect(consoleErrors).toEqual([]);
 > 21 |   await expect(pageErrors).toEqual([]);

@facebook-github-bot facebook-github-bot added CLA Signed React Core Team Opened by a member of the React Core Team labels Apr 8, 2024
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react-sizebot commented Apr 8, 2024 •
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Comparing: f86afca...4b32fda

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name +/- Base Current +/- gzip Base gzip Current gzip
oss-stable/react-dom/cjs/react-dom.production.min.js = 168.90 kB 168.90 kB = 52.69 kB 52.69 kB
oss-experimental/react-dom/cjs/react-dom.production.min.js = 170.71 kB 170.71 kB = 53.24 kB 53.24 kB
facebook-www/ReactDOM-prod.classic.js = 590.23 kB 590.23 kB = 103.62 kB 103.62 kB
facebook-www/ReactDOM-prod.modern.js = 566.56 kB 566.56 kB = 99.57 kB 99.57 kB
test_utils/ReactAllWarnings.js Deleted 64.04 kB 0.00 kB Deleted 16.02 kB 0.00 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show
Name +/- Base Current +/- gzip Base gzip Current gzip
test_utils/ReactAllWarnings.js Deleted 64.04 kB 0.00 kB Deleted 16.02 kB 0.00 kB

Generated by 🚫 dangerJS against 4b32fda

@eps1lon eps1lon changed the title Add Promise as a child to Flight fixture Add Promise as a child test to Flight fixture Apr 8, 2024
@eps1lon eps1lon marked this pull request as ready for review April 8, 2024 11:25
@eps1lon eps1lon requested a review from sebmarkbage April 8, 2024 11:25
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Wait how does that PR fix it? That was intended more as a performance optimization.

@eps1lon
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eps1lon commented Apr 8, 2024

I didn't dig further yet. But reverting the PR does produce the hydration error. Maybe it was https://github.com/facebook/react/pull/28284/files#r1483763696 specifically that fixed it?

sebmarkbage
sebmarkbage approved these changes Apr 8, 2024
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There seems to be something off about that logic if that's necessary. Maybe there's other cases it's broken too.

@eps1lon eps1lon merged commit e63918d into facebook:main Apr 8, 2024
38 checks passed
@eps1lon eps1lon deleted the test/promise-as-a-child branch April 8, 2024 15:06
rickhanlonii pushed a commit that referenced this pull request Apr 11, 2024
@eps1lon @rickhanlonii
Add Promise as a child test to Flight fixture (#28778)
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rickhanlonii pushed a commit that referenced this pull request Apr 11, 2024
@eps1lon @rickhanlonii
Add Promise as a child test to Flight fixture (#28778)
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EdisonVan pushed a commit to EdisonVan/react that referenced this pull request Apr 15, 2024
@eps1lon @AndyPengc12
Add Promise as a child test to Flight fixture (facebook#28778)
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This was referenced Apr 24, 2024
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@sebmarkbage sebmarkbage sebmarkbage approved these changes

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