fix(core): remove once() listener when off() is called with the original function - #1409
fix(core): remove once() listener when off() is called with the original function#1409rohitsux wants to merge 2 commits into
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…nal function SimpleEventEmitter.once() registers an internal wrapper, so off(event, listener) deleted the original function (never in the set) and left the wrapper registered -- a listener removed via off() still fired on the next emit. Tag the wrapper with .listener and have off() fall back to removing it, mirroring Node's EventEmitter.
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ChangesOnce-listener removal
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to This change allows off() to remove once() registrations, including mixed on()/once() usage, preventing removed listeners from firing later. No current merge-blocking risk remains. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@packages/core/src/utils/simple-event-emitter.ts`:
- Around line 20-22: Update the listener removal logic in the emitter’s off
implementation so registrations matching the same callback are handled
consistently when on and once are mixed: search both direct and wrapped
registrations in a defined order, preferably removing the newest matching
registration first, rather than skipping wrapper lookup after direct deletion.
Add a regression test covering mixed on/once registration followed by off and
emit.
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Re-trigger cubic
When the same function was registered with both on() and once(), off() deleted the direct registration first and left the once() wrapper armed, so a "removed" one-time listener still fired on the next emit. off() now scans every registration and removes only the newest matching entry (function or wrapper), mirroring Node's EventEmitter removal order. Adds a regression test for the mixed on()/once() case.
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What
SimpleEventEmitter.once()registers an internalwrapper(not the originallistener), butoff(event, listener)didset.delete(listener)against the original function — which is never in the set. So callingoff()with a listener added viaonce()was a no-op: the listener stayed registered and still fired on the nextemit(), andlistenerCountstayed non-zero.Fix
Mirror Node's
EventEmitter: tag theonce()wrapper with.listener = listener, and inoff(), if the direct delete misses, remove the wrapper whose.listeneris the original. Normalon()/off()and the fire-once-then-remove path are unchanged.Test
Adds
simple-event-emitter.spec.ts: afteroff()aonce()listener no longer fires andlistenerCountis 0;once()still fires exactly once and self-removes. Full@voltagent/coresuite green (1269 tests), biome and build clean.Summary by cubic
Fixes
SimpleEventEmitter.off()so it removes listeners registered viaonce(). Previouslyonce()stored an internal wrapper, sooff(event, listener)deleted the original function (never in the set) and left the wrapper registered — a removed listener still fired on the nextemit().off()now resolves the original listener back to its wrapper and removes only the newest matching registration when the same function is registered with bothon()andonce(), mirroring Node'sEventEmitter.Bug Fixes
once()wrapper with a.listenerreference sooff()can find and delete it.off()removing aonce()listener, single-fire behavior, and mixedon()/once()registrations.Written for commit 86c1d66. Summary will update on new commits.
Summary by CodeRabbit
Bug Fixes
Tests