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[pull] main from facebook:main#481

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pull[bot] merged 1 commit intocode:mainfrom
facebook:main
Feb 16, 2026
Merged

[pull] main from facebook:main#481
pull[bot] merged 1 commit intocode:mainfrom
facebook:main

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@pull pull bot commented Feb 16, 2026

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Created by pull[bot] (v2.0.0-alpha.4)

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…ion (#35795)

When the Flight Client resolves chunk references during model parsing,
it calls `transferReferencedDebugInfo` to propagate debug info entries
from referenced chunks to the parent chunk. Debug info on chunks is
later moved to their resolved values, where it is used by React DevTools
to show performance tracks and what a component was suspended by.

Debug chunks themselves (specifically `ReactComponentInfo`,
`ReactAsyncInfo`, `ReactIOInfo`, and their outlined references) are
metadata that is never rendered. They don't need debug info attached to
them. Without this fix, debug info entries accumulate on outlined debug
chunks via their references to other debug chunks (e.g. owner chains and
props deduplication paths). Since each outlined chunk's accumulated
entries are copied to every chunk that references it, this creates
exponential growth in deep component trees, which can cause the dev
server to hang and run out of memory.

This generalizes the existing skip of `transferReferencedDebugInfo` for
Element owner/stack references (which already recognizes that references
to debug chunks don't need debug info transferred) to all references
resolved during debug info resolution. It adds an
`isInitializingDebugInfo` flag set in `initializeDebugChunk` and
`resolveIOInfo`, which propagates through all nested
`initializeModelChunk` calls within the same synchronous stack. For the
async path, `waitForReference` captures the flag at call time into
`InitializationReference.isDebug`, so deferred fulfillments also skip
the transfer.
@pull pull bot locked and limited conversation to collaborators Feb 16, 2026
@pull pull bot added the ⤵️ pull label Feb 16, 2026
@pull pull bot merged commit 47d1ad1 into code:main Feb 16, 2026
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