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jasnell wants to merge 5 commits into from
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events: add async emitter.when #15204

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b10cea3
events: add async emitter.when
jasnell Sep 2, 2017
2888ab1
[Squash] Nits
jasnell Sep 5, 2017
c02d332
[Squash] Use Error for reason
jasnell Sep 5, 2017
efd97d2
[Squash] Add error code to docs
jasnell Sep 5, 2017
438e695
[Squash] Remove prepend option
jasnell Sep 5, 2017
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[Squash] Add error code to docs
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@jasnell
jasnell committed Sep 5, 2017
commit efd97d2d4af102d54a0779fd933c31640ea5c383
17 changes: 17 additions & 0 deletions doc/api/errors.md
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Expand Up @@ -614,6 +614,23 @@ Used when the native call from `process.cpuUsage` cannot be processed properly.

Used when `c-ares` failed to set the DNS server.

<a id="ERR_EVENTS_WHEN_CANCELED"></a>
### ERR_EVENTS_WHEN_CANCELED

Used when a `Promise` created using `emitter.when()` has been rejected because
the listener has been removed.

```js
const EventEmitter = require('events');

const ee = new EventEmitter();
ee.when('foo').then(() => { /* ... */ }).catch((reason) => {
console.log(reason.code); // ERR_EVENTS_WHEN_CANCELED
});

ee.removeAllListeners('foo');
```

<a id="ERR_FALSY_VALUE_REJECTION"></a>
### ERR_FALSY_VALUE_REJECTION

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