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Resolve the .default export of a React.lazy as the canonical value - #34906
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Comparing: 40c7a7f...a12cc9a Critical size changesIncludes critical production bundles, as well as any change greater than 2%:
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eps1lon
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Oct 19, 2025
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| // Surface the default export as the resolved "value" for debug purposes. | ||
| const debugValue = | ||
| moduleObject == null ? undefined : moduleObject.default; | ||
| resolveDebugValue(debugValue); | ||
| // $FlowFixMe | ||
| ioInfo.value.status = 'fulfilled'; | ||
| // $FlowFixMe | ||
| ioInfo.value.value = debugValue; |
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This block isn't gated on enableAsyncDebugInfo but resolveDebugValue is only callable with enableAsyncDebugInfo. enableAsyncDebugInfo isn't enabled everywhere at the moment.
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I guess this is implied via payload._ioInfo but still nice for DCE and readability to gate it.
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Fixed. The whole block should've been gated before just like the reject.
eps1lon
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Oct 19, 2025
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sebmarkbage added a commit
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Oct 19, 2025
) Stacked on #34906. Infer name from stack if it's the generic "lazy" name. It might be wrapped in an abstraction. E.g. `next/dynamic`. Also use the function name as a description of a resolved function value. <img width="310" height="166" alt="Screenshot 2025-10-18 at 10 42 05 AM" src="https://github.com/user-attachments/assets/c63170b9-2b19-4f30-be7a-6429bb3ef3d9" />
sebmarkbage pushed a commit
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Oct 20, 2025
[diff react/react@1324e1bb...58bdc0bb](react/react@1324e1b...58bdc0b) <details> <summary>React upstream changes</summary> - react/react#34911 - react/react#34907 - react/react#34906 - react/react#34898 - react/react#34893 - react/react#34892 - react/react#34885 - react/react#34881 - react/react#34894 - react/react#34880 - react/react#34849 - react/react#34900 - react/react#34887 </details>
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For debug purposes this is the value that the
React.lazyresolves to. It also lets us look at that value for descriptions like its name.