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TypeError: EventEmitter, setMaxListeners, Symbol #9003

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Closed
TypeError: EventEmitter, setMaxListeners, Symbol#9003
Labels
eventsIssues and PRs related to EventEmitter and the events module.

Description

@Daeren
Daeren
opened on Oct 10, 2016
  • Version: 6.7.0
  • Platform: Win 10 @ 64-bit

Expected Behavior

(node:3712) Warning: Possible EventEmitter memory leak detected.
2 Symbol("X") listeners added. Use emitter.setMaxListeners() to increase limit

Current Behavior

TypeError: Cannot convert a Symbol value to a string

Steps to Reproduce

"use strict";

const EventEmitter = require("events");

const ev    = new EventEmitter(),
      sym   = Symbol("X"); // "X";

ev
    .setMaxListeners(1)
    .on(sym, console.log)
    .on(sym, console.log)
    .emit(sym, 200);

Stack trace

events.js:260
                            `${existing.length} ${type} listeners added. ` +
                                                  ^

TypeError: Cannot convert a Symbol value to a string
    at _addListener (events.js:260:51)
    at EventEmitter.addListener (events.js:275:10)
    at Object.<anonymous> (J:\main.js:13:6)
    at Module._compile (module.js:556:32)
    at Object.Module._extensions..js (module.js:565:10)
    at Module.load (module.js:473:32)
    at tryModuleLoad (module.js:432:12)
    at Function.Module._load (module.js:424:3)
    at Module.runMain (module.js:590:10)
    at run (bootstrap_node.js:394:7)

Activity

  1. vkurchatkin
    added
    eventsIssues and PRs related to EventEmitter and the events module.
    good first issueIssues that are suitable for first-time contributors.
    on Oct 10, 2016
  2. addaleax
    removed
    good first issueIssues that are suitable for first-time contributors.
    on Oct 11, 2016
  3. jseagull
    added a commit that references this issue on Oct 12, 2016

    events,test: fix TypeError in EventEmitter warning

    6434859
  4. jasnell
    closed this as completedin 254ab63on Oct 26, 2016
  5. evanlucas
    added a commit that references this issue on Nov 3, 2016

    events,test: fix TypeError in EventEmitter warning

    0ce0abf

  6. polomsky commented on Apr 16, 2017

    @polomsky
    polomsky
    on Apr 16, 2017

    @jasnell It is fixed in master branch but still not fixed in LTS (6.x)

  7. jasnell commented on Apr 16, 2017

    @jasnell
    jasnell
    on Apr 16, 2017
    Member

    Ok. Will have to investigate why that didn't get pulled into a release.

    Ping... @nodejs/lts

  8. jasnell
    reopened this on Apr 16, 2017

  9. gibfahn commented on Apr 16, 2017

    @gibfahn
    gibfahn
    on Apr 16, 2017
    Member

    @jasnell looks like it needs a backport: #9021 (comment)

  10. jseagull
    added a commit that references this issue on Apr 17, 2017

    events,test: fix TypeError in EventEmitter warning

    bd8207e
  11. MylesBorins
    added 2 commits that reference this issue on Apr 18, 2017

    events,test: fix TypeError in EventEmitter warning

    e760a1b

    events,test: fix TypeError in EventEmitter warning

    1158f44

  12. Trott commented on Aug 2, 2017

    @Trott
    Trott
    on Aug 2, 2017
    Member

    It looks like the backport loanded in April. Closing. Feel free to comment or re-open if I'm wrong and this is still a thing.

  13. Trott
    closed this as completedon Aug 2, 2017
  14. sjarmak
    added a commit that references this issue on Jul 27, 2026

    events,test: fix TypeError in EventEmitter warning

    254ab63
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