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doc: watermark string behavior
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Documents that we calculate the highWaterMark value
of streams operating on strings using the number of
UTF-16 code units.

Fixes: #52818
PR-URL: #52842
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
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benjamingr authored and targos committed May 11, 2024
1 parent fbce317 commit 5d3ee72
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4 changes: 3 additions & 1 deletion doc/api/stream.md
Original file line number Diff line number Diff line change
Expand Up @@ -317,7 +317,9 @@ buffer.
The amount of data potentially buffered depends on the `highWaterMark` option
passed into the stream's constructor. For normal streams, the `highWaterMark`
option specifies a [total number of bytes][hwm-gotcha]. For streams operating
in object mode, the `highWaterMark` specifies a total number of objects.
in object mode, the `highWaterMark` specifies a total number of objects. For
streams operating on (but not decoding) strings, the `highWaterMark` specifies
a total number of UTF-16 code units.

Data is buffered in `Readable` streams when the implementation calls
[`stream.push(chunk)`][stream-push]. If the consumer of the Stream does not
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