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.
lpinca
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marsonya
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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.Transform callback second argument is passed only if the first argument is null, 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 an Error. I was implementing a truncation stream, and passed both an Error ("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 not null.
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.