stream: preserve toReadableSync batch after backpressure#63276
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Keep the current batch and index across _read() calls so chunks that remain after push() returns false are emitted on later reads. Fixes: nodejs#63275 Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com> Assisted-by: openai:gpt-5.5
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #63276 +/- ##
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Coverage 90.04% 90.05%
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Files 713 714 +1
Lines 225003 225256 +253
Branches 42536 42573 +37
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- Misses 14177 14181 +4
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toReadableSync()could drop chunks from a batch when classic streambackpressure was applied.
When
_read()pulled a batch with multiple chunks andpush()returnedfalse, the method returned immediately without saving the remaining batchitems. A later
_read()call advanced to the next iterator result, so theunpushed chunks were lost.
This stores the current batch and index across
_read()calls, allowingtoReadableSync()to resume the same batch after backpressure clears.Fixes: #63275
Assisted-by: openai:gpt-5.5