doc: clarify transform._transform() callback argument logic #48680
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Clarify that `transform._transform()` callback second argument is used only if the first argument is `null`, i.e. no error occured processing the chunk.
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Clarify that `transform._transform()` callback second argument is used only if the first argument is `null`, i.e. no error occured processing the chunk. PR-URL: #48680 Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Akhil Marsonya <akhil.marsonya27@gmail.com>
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Clarify that `transform._transform()` callback second argument is used only if the first argument is `null`, i.e. no error occured processing the chunk. PR-URL: nodejs#48680 Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Akhil Marsonya <akhil.marsonya27@gmail.com>
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Clarify that `transform._transform()` callback second argument is used only if the first argument is `null`, i.e. no error occured processing the chunk. PR-URL: nodejs#48680 Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Akhil Marsonya <akhil.marsonya27@gmail.com>
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Clarify that `transform._transform()` callback second argument is used only if the first argument is `null`, i.e. no error occured processing the chunk. PR-URL: #48680 Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Akhil Marsonya <akhil.marsonya27@gmail.com>
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Clarify that `transform._transform()` callback second argument is used only if the first argument is `null`, i.e. no error occured processing the chunk. PR-URL: #48680 Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Akhil Marsonya <akhil.marsonya27@gmail.com>
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Clarify that `transform._transform()` callback second argument is used only if the first argument is `null`, i.e. no error occured processing the chunk. PR-URL: #48680 Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Akhil Marsonya <akhil.marsonya27@gmail.com>
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Edited / fixed version of #48653
Clarified that
stream.Transformcallback second argument is passed only if the first argument isnull, i.e. no error occured processing the chunk.From the way the documentation is written right now, I expected the second argument to be forwarded to
transform.push(), even if the first argument is anError. I was implementing a truncation stream, and passed both anError("stream exceeded maximum size"; could be optionally caught and ignored), and the last (truncated) chunk. Only after digging through the relevant implementaton I could confirm for sure that the second argument is entirely ignored if the first one is notnull.Please tell me if you want to adjust the wording somehow, or whether I should add an alternative example to the one following the line "In other words, the following are equivalent:". Hopefully you'll find this useful.