events: avoid retaining removed event names#64475
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Restore shape mode for preallocated EventEmitters while deleting dynamic names from ordinary EventEmitters. Keeping every removed name as an undefined property causes unbounded memory growth when event names are unstructured. Refs: nodejs#64373 Signed-off-by: Matteo Collina <hello@matteocollina.com>
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #64475 +/- ##
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Coverage 90.21% 90.22%
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Files 741 741
Lines 241608 241615 +7
Branches 45534 45523 -11
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+ Hits 217972 217987 +15
- Misses 15154 15158 +4
+ Partials 8482 8470 -12
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Follow-up to #64373.
That change retained removed listener keys with an
undefinedvalue for allEventEmitterinstances. With unstructured event names,_eventswould therefore grow without bound.This restores shape mode so preallocated emitters can retain their fixed keys while ordinary emitters delete dynamic keys or reset the events object. It also adds a regression test that adds and removes 100 unique event names and verifies they are not retained.