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doc: update promisify() docs with behavior when bad arguments are passed #17593

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2067648
doc: update promisify docs with behavior when bad arguments are passed
lossycache Dec 10, 2017
1c272f9
doc: use 'Node.js style' callback
lossycache Dec 10, 2017
e215574
doc: fix line length and wording
lossycache Dec 12, 2017
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8 changes: 6 additions & 2 deletions doc/api/util.md
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Expand Up@@ -552,8 +552,10 @@ If there is an `original[util.promisify.custom]` property present, `promisify`
will return its value, see [Custom promisified functions][].

`promisify()` assumes that `original` is a function taking a callback as its
final argument in all cases, and the returned function will result in undefined
behavior if it does not.
final argument in all cases. If `original` is not a function, `promisify()`
will throw an error. If `original` is a function but its last argument is not a
Node.js style callback, it will still be passed a Node.js style callback
as its last argument.

### Custom promisified functions

Expand DownExpand Up@@ -588,6 +590,8 @@ doSomething[util.promisify.custom] = (foo) => {
});
};
```
If `promisify.custom` is defined but is not a function, `promisify()` will
throw an error.

### util.promisify.custom
<!-- YAML
Expand Down