Files
bun.sh/test/regression/issue
robobun 4f1b90ad1d Fix EventEmitter crash in removeAllListeners with removeListener meta-listener (#24148)
## Summary

Fixes #24147

- Fixed EventEmitter crash when `removeAllListeners()` is called from
within an event handler while a `removeListener` meta-listener is
registered
- Added undefined check before iterating over listeners array to match
Node.js behavior
- Added comprehensive regression tests

## Bug Description

When `removeAllListeners(type)` was called:
1. From within an event handler 
2. While a `removeListener` meta-listener was registered
3. For an event type with no listeners

It would crash with: `TypeError: undefined is not an object (evaluating
'this._events')`

## Root Cause

The `removeAllListeners` function tried to access `listeners.length`
without checking if `listeners` was defined first. When called with an
event type that had no listeners, `events[type]` returned `undefined`,
causing the crash.

## Fix

Added a check `if (listeners !== undefined)` before iterating, matching
the behavior in Node.js core:
https://github.com/nodejs/node/blob/main/lib/events.js#L768

## Test plan

-  Created regression test in `test/regression/issue/24147.test.ts`
-  Verified test fails with `USE_SYSTEM_BUN=1 bun test` (reproduces
bug)
-  Verified test passes with `bun bd test` (confirms fix)
-  Test covers the exact reproduction case from the issue
-  Additional tests for edge cases (actual listeners, nested calls)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
2025-10-28 12:32:15 -07:00
..
2025-08-06 06:44:46 -07:00
2025-01-28 17:23:57 -08:00
2025-06-03 13:23:12 -07:00
2025-06-03 23:41:37 -07:00
2025-01-17 22:08:07 -08:00
2024-06-14 01:50:36 -07:00
2025-03-03 21:38:05 -08:00
2025-05-26 21:18:22 -07:00
2025-07-03 01:06:22 -07:00
2025-07-23 22:31:42 -07:00
2025-10-20 14:07:31 -07:00
2025-07-20 23:02:10 -07:00