events: repurpose events.listenerCount() to accept EventTargets
#60214
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| @@ -59,7 +59,8 @@ Stream.prototype.pipe = function(dest, options) { | |||
| // Don't leave dangling pipes when there are errors. | |||
| function onerror(er) { | |||
| cleanup(); | |||
| if (EE.listenerCount(this, 'error') === 0) { | |||
| // If we removed the last error handler, trigger an unhandled error event. | |||
| if (this.listenerCount?.('error') === 0) { | |||
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Legacy behaviour dictates that stream.pipe() targets do not need to be true EventEmitters; this.listenerCount might not exist at all (#2655).
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #60214 +/- ##
==========================================
+ Coverage 88.04% 88.53% +0.49%
==========================================
Files 703 703
Lines 208260 208263 +3
Branches 40068 40163 +95
==========================================
+ Hits 183360 184385 +1025
+ Misses 16840 15876 -964
+ Partials 8060 8002 -58
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PR-URL: #60214 Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
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Resolves #60212.
Makes
events.listenerCount()agnostic over both EventEmitters and EventTargets.For EventTargets, this is faster than the
events.getEventListeners(...).lengthpattern currently in use within the test suite, as it doesn't need to traverse the linked list.Note that this now validates the emitter argument, whereas the previous version did not (it just returned 0 if the target wasn't an EventEmitter). Dealer's choice as to whether or not this constitutes a minor or major change.