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doc: clarify transform._transform() callback argument logic
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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 <[email protected]>
Reviewed-By: Akhil Marsonya <[email protected]>
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rafasofizada authored Jul 8, 2023
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3 changes: 2 additions & 1 deletion doc/api/stream.md
Original file line number Diff line number Diff line change
Expand Up @@ -4517,7 +4517,8 @@ The `callback` function must be called only when the current chunk is completely
consumed. The first argument passed to the `callback` must be an `Error` object
if an error occurred while processing the input or `null` otherwise. If a second
argument is passed to the `callback`, it will be forwarded on to the
`transform.push()` method. In other words, the following are equivalent:
`transform.push()` method, but only if the first argument is falsy. In other
words, the following are equivalent:

```js
transform.prototype._transform = function(data, encoding, callback) {
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