events: support emit on nodeeventtarget #35851

benjamingr · 2020-10-28T14:25:09Z

Checklist

make -j4 test (UNIX), or vcbuild test (Windows) passes
tests and/or benchmarks are included
documentation is changed or added
commit message follows commit guidelines

benjamingr · 2020-10-28T14:25:25Z

lib/internal/event_target.js

@@ -160,6 +161,14 @@ ObjectDefineProperty(Event.prototype, SymbolToStringTag, {
  value: 'Event',
 });

+class NodeCustomEvent extends Event {


Name bikeshedding - welcome

👍 from me

benjamingr · 2020-10-28T14:26:28Z

lib/internal/event_target.js

@@ -463,6 +475,22 @@ class NodeEventTarget extends EventTarget {
    this.addEventListener(type, listener, { [kIsNodeStyleListener]: true });
    return this;
  }
+  emit(type, arg) {
+    if (arguments.length > 2) {


I am not sure this is the right error to throw and I am not sure throwing is the right behavior.

Other alternatives can be:

Wrap it in an array

Ignore additional arguments and emit the first one

Behave differently for emitter style and target style listeners.

Ignore additional arguments and emit the first one

I think I’d have a mild preference for this one, but really only a mild one.

lib/internal/worker/io.js

addaleax · 2020-10-28T14:30:29Z

lib/internal/event_target.js

@@ -160,6 +161,14 @@ ObjectDefineProperty(Event.prototype, SymbolToStringTag, {
  value: 'Event',
 });

+class NodeCustomEvent extends Event {


👍 from me

addaleax · 2020-10-28T14:31:22Z

lib/internal/event_target.js

@@ -463,6 +475,22 @@ class NodeEventTarget extends EventTarget {
    this.addEventListener(type, listener, { [kIsNodeStyleListener]: true });
    return this;
  }
+  emit(type, arg) {
+    if (arguments.length > 2) {


Ignore additional arguments and emit the first one

I think I’d have a mild preference for this one, but really only a mild one.

addaleax · 2020-10-28T14:31:58Z

lib/internal/event_target.js

+        'Passing more than one argument to NodeEventTarget' +
+        ' dispatch is not supported'


NodeEventTarget is purely internal, so I would not mention it here, tbh. Maybe just say `.emit()` on a Node.js `EventTarget`?

lib/internal/worker/io.js

benjamingr · 2020-10-29T08:54:23Z

cc @nodejs/workers

nodejs-github-bot · 2020-10-29T08:55:35Z

CI: https://ci.nodejs.org/job/node-test-pull-request/33928/

nodejs-github-bot · 2020-10-29T12:23:50Z

CI: https://ci.nodejs.org/job/node-test-pull-request/33932/

ZYSzys · 2020-10-29T15:32:36Z

lib/internal/event_target.js

@@ -463,6 +474,14 @@ class NodeEventTarget extends EventTarget {
    this.addEventListener(type, listener, { [kIsNodeStyleListener]: true });
    return this;
  }
+  emit(type, arg) {
+    if (typeof type !== 'string') {


Minor suggestion: use validateString from /internal/validators.

Suggested change

if (typeof type !== 'string') {

validateString(type, 'type')

benjamingr · 2020-10-31T09:35:38Z

Accidentially converted to draft - will convert back, mixed this up with the AbortSignal PR 😅

nodejs-github-bot · 2020-10-31T09:43:02Z

CI: https://ci.nodejs.org/job/node-test-pull-request/33989/

nodejs-github-bot · 2020-11-02T10:29:19Z

CI: https://ci.nodejs.org/job/node-test-pull-request/34015/

nodejs-github-bot · 2020-11-04T10:28:21Z

CI: https://ci.nodejs.org/job/node-test-pull-request/34055/

github-actions · 2020-11-06T10:42:02Z

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- Loading data for nodejs/node/pull/35851
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----------------------------------- PR info ------------------------------------
Title      events: support emit on nodeeventtarget (#35851)
   ⚠  Could not retrieve the email or name of the PR author's from user's GitHub profile!
Branch     benjamingr:node-event-target-emit -> nodejs:master
Labels     author ready, lts-watch-v14.x, worker
Commits    1
 - events: support emit on nodeeventtarget
Committers 1
 - Benjamin Gruenbaum 
PR-URL: https://github.com/nodejs/node/pull/35851
Reviewed-By: Anna Henningsen 
Reviewed-By: Rich Trott 
Reviewed-By: Yongsheng Zhang 
Reviewed-By: Ricky Zhou <[email protected]>
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs/node/pull/35851
Reviewed-By: Anna Henningsen 
Reviewed-By: Rich Trott 
Reviewed-By: Yongsheng Zhang 
Reviewed-By: Ricky Zhou <[email protected]>
--------------------------------------------------------------------------------
   ⚠  Commits were pushed since the last review:
   ⚠  - events: support emit on nodeeventtarget
   ✔  Last GitHub Actions successful
   ℹ  Last Full PR CI on 2020-11-06T10:15:15Z: https://ci.nodejs.org/job/node-test-pull-request/34119/
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✔  Build data downloaded
   ✔  Last Jenkins CI successful
   ℹ  This PR was created on Wed, 28 Oct 2020 14:25:09 GMT
   ✔  Approvals: 4
   ✔  - Anna Henningsen (@addaleax): https://github.com/nodejs/node/pull/35851#pullrequestreview-518726152
   ✔  - Rich Trott (@Trott) (TSC): https://github.com/nodejs/node/pull/35851#pullrequestreview-519608507
   ✔  - Yongsheng Zhang (@ZYSzys): https://github.com/nodejs/node/pull/35851#pullrequestreview-519795411
   ✔  - Ricky Zhou (@rickyes): https://github.com/nodejs/node/pull/35851#pullrequestreview-521105281
--------------------------------------------------------------------------------
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Commit Queue action: https://github.com/nodejs/node/actions/runs/349293015

github-actions · 2020-11-06T10:51:06Z

Landed in 2a1273c...c5477be

PR-URL: #35851 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Rich Trott <[email protected]> Reviewed-By: Yongsheng Zhang <[email protected]> Reviewed-By: Ricky Zhou <[email protected]>

PR-URL: nodejs#35851 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Rich Trott <[email protected]> Reviewed-By: Yongsheng Zhang <[email protected]> Reviewed-By: Ricky Zhou <[email protected]>

PR-URL: #35851 Backport-PR-URL: #38386 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Rich Trott <[email protected]> Reviewed-By: Yongsheng Zhang <[email protected]> Reviewed-By: Ricky Zhou <[email protected]>

NodeEventTarget.emit() is not described in document. Plus, make type parameter of removeAllListeners as optional. Refs: #35851 PR-URL: #46356 Reviewed-By: Luigi Pinca <[email protected]> Reviewed-By: Benjamin Gruenbaum <[email protected]>

NodeEventTarget.emit() is not described in document. Plus, make type parameter of removeAllListeners as optional. Refs: nodejs/node#35851

benjamingr requested a review from addaleax October 28, 2020 14:25

nodejs-github-bot added the worker Issues and PRs related to Worker support. label Oct 28, 2020

benjamingr commented Oct 28, 2020

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benjamingr mentioned this pull request Oct 28, 2020

worker_threads parentPort extends EventTarget in Node 14 but extends EventEmitter in Node 12 #35835

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benjamingr marked this pull request as draft October 31, 2020 09:33

benjamingr marked this pull request as ready for review October 31, 2020 09:35

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events: support emit on nodeeventtarget

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benjamingr force-pushed the node-event-target-emit branch from 4c1d6a7 to f8e9bfc Compare November 4, 2020 10:21

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danielleadams mentioned this pull request Nov 9, 2020

v15.2.0 proposal #36055

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targos added backport-open-v14.x and removed lts-watch-v14.x labels Apr 24, 2021

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[v14.x] Backport AbortController and friends #38386

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v14.17.0 proposal #38507

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F3n67u mentioned this pull request Jun 21, 2022

events: add CustomEvent #43514

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deokjinkim mentioned this pull request Jan 26, 2023

doc: add emit to NodeEventTarget #46356

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abhishekumar-tyagi pushed a commit to abhishekumar-tyagi/node that referenced this pull request May 5, 2024

doc: add emit to NodeEventTarget

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NodeEventTarget.emit() is not described in document. Plus, make type parameter of removeAllListeners as optional. Refs: nodejs/node#35851

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events: support emit on nodeeventtarget #35851

events: support emit on nodeeventtarget #35851

benjamingr commented Oct 28, 2020

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		'Passing more than one argument to NodeEventTarget' +
		' dispatch is not supported'

events: support emit on nodeeventtarget #35851

events: support emit on nodeeventtarget #35851

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benjamingr commented Oct 28, 2020

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