events: add getMaxListeners method #47039

KhafraDev · 2023-03-11T00:47:13Z

This adds an events.getMaxListeners method that both EventEmitter & EventTarget can use. Currently, there isn't a way to get the max listeners for an EventTarget.

Undici currently increases AbortSignal's max listeners because 10 is too conservative for fetch. However someone might increase this limit, which we override. Using this we can detect if the limit's been changed, and not set our own default if it has.

import { getMaxListeners, setMaxListeners } from 'node:events'

const { signal } = new AbortController()

getMaxListeners(signal) // 10
setMaxListeners(11, signal)
getMaxListeners(signal) // 11

Refs: nodejs/undici#1910 (comment)

debadree25 · 2023-03-12T15:49:19Z

also cc'ing @nodejs/events

debadree25 · 2023-03-13T07:44:02Z

I think this would qualify as semver-minor too? since adding a new api hence added the label

doc/api/events.md

PR-URL: #47039 Reviewed-By: Debadree Chatterjee <debadree333@gmail.com> Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

Notable changes: events: * (SEMVER-MINOR) add getMaxListeners method (Khafra) #47039 lib: * (SEMVER-MINOR) add tracing channel to diagnostics\_channel (Stephen Belanger) msi: * (SEMVER-MINOR) migrate to WiX4 (Stefan Stojanovic) #45943 node-api: * (SEMVER-MINOR) deprecate napi\_module\_register (Vladimir Morozov) #46319 stream: * (SEMVER-MINOR) add setter & getter for default highWaterMark (Robert Nagy) #46929 url: * (SEMVER-MINOR) implement URL.canParse (Khafra) #47179 wasi: * (SEMVER-MINOR) no longer require flag to enable wasi (Michael Dawson) #47286 PR-URL: TBD

Notable changes: events: * (SEMVER-MINOR) add getMaxListeners method (Khafra) #47039 lib: * (SEMVER-MINOR) add tracing channel to diagnostics\_channel (Stephen Belanger) msi: * (SEMVER-MINOR) migrate to WiX4 (Stefan Stojanovic) #45943 node-api: * (SEMVER-MINOR) deprecate napi\_module\_register (Vladimir Morozov) #46319 stream: * (SEMVER-MINOR) add setter & getter for default highWaterMark (Robert Nagy) #46929 url: * (SEMVER-MINOR) implement URL.canParse (Khafra) #47179 wasi: * (SEMVER-MINOR) no longer require flag to enable wasi (Michael Dawson) #47286 PR-URL: #47441

PR-URL: #47039 Reviewed-By: Debadree Chatterjee <debadree333@gmail.com> Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

Notable changes: events: * (SEMVER-MINOR) add getMaxListeners method (Khafra) #47039 lib: * (SEMVER-MINOR) add tracing channel to diagnostics\_channel (Stephen Belanger) msi: * (SEMVER-MINOR) migrate to WiX4 (Stefan Stojanovic) #45943 node-api: * (SEMVER-MINOR) deprecate napi\_module\_register (Vladimir Morozov) #46319 stream: * (SEMVER-MINOR) add setter & getter for default highWaterMark (Robert Nagy) #46929 url: * (SEMVER-MINOR) implement URL.canParse (Khafra) #47179 wasi: * (SEMVER-MINOR) no longer require flag to enable wasi (Michael Dawson) #47286 PR-URL: #47441

Notable changes: events: * (SEMVER-MINOR) add getMaxListeners method (Khafra) #47039 lib: * (SEMVER-MINOR) add tracing channel to diagnostics\_channel (Stephen Belanger) msi: * (SEMVER-MINOR) migrate to WiX4 (Stefan Stojanovic) #45943 node-api: * (SEMVER-MINOR) deprecate napi\_module\_register (Vladimir Morozov) #46319 stream: * (SEMVER-MINOR) add setter & getter for default highWaterMark (Robert Nagy) #46929 url: * (SEMVER-MINOR) implement URL.canParse (Khafra) #47179 PR-URL: #47441

Notable changes: events: * (SEMVER-MINOR) add getMaxListeners method (Khafra) #47039 lib: * (SEMVER-MINOR) add tracing channel to diagnostics\_channel (Stephen Belanger) msi: * (SEMVER-MINOR) migrate to WiX4 (Stefan Stojanovic) #45943 node-api: * (SEMVER-MINOR) deprecate napi\_module\_register (Vladimir Morozov) #46319 stream: * (SEMVER-MINOR) add setter & getter for default highWaterMark (Robert Nagy) #46929 url: * (SEMVER-MINOR) implement URL.canParse (Khafra) #47179 test_runner: * (SEMVER-MINOR) expose reporter for use in run api (Chemi Atlow) #47238 PR-URL: #47441 Signed-off-by: RafaelGSS <rafael.nunu@hotmail.com>

PR-URL: #47039 Reviewed-By: Debadree Chatterjee <debadree333@gmail.com> Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

Notable changes: crypto: * update root certificates to NSS 3.89 (Node.js GitHub Bot) #47659 * use WebIDL converters in WebCryptoAPI (Filip Skokan) #46067 deps: * update ada to 2.0.0 (Node.js GitHub Bot) #47339 dns: * (SEMVER-MINOR) expose getDefaultResultOrder (btea) #46973 doc: * add ovflowd to collaborators (Claudio Wunder) #47844 * add KhafraDev to collaborators (Matthew Aitken) #47510 * events: * (SEMVER-MINOR) add getMaxListeners method (Matthew Aitken) #47039 fs: * (SEMVER-MINOR) add support for mode flag to specify the copy behavior (Tetsuharu Ohzeki) #47084 * (SEMVER-MINOR) add recursive option to readdir and opendir (Ethan Arrowood) #41439 * (SEMVER-MINOR) add support for mode flag to specify the copy behavior (Tetsuharu Ohzeki) #47084 * (SEMVER-MINOR) implement byob mode for readableWebStream() (Debadree Chatterjee) #46933 http: * (SEMVER-MINOR) prevent writing to the body when not allowed by HTTP spec (Gerrard Lindsay) #47732 * (SEMVER-MINOR) remove internal error in assignSocket (Matteo Collina) #47723 * (SEMVER-MINOR) add highWaterMark opt in http.createServer (HinataKah0) #47405 lib: * (SEMVER-MINOR) add webstreams to Duplex.from() (Debadree Chatterjee) #46190 module: * change default resolver to not throw on unknown scheme (Gil Tayar) #47824 node-api: * (SEMVER-MINOR) define version 9 (Chengzhong Wu) #48151 * (SEMVER-MINOR) deprecate napi_module_register (Vladimir Morozov) #46319 stream: * (SEMVER-MINOR) preserve object mode in compose (Raz Luvaton) #47413 * (SEMVER-MINOR) add setter & getter for default highWaterMark (#46929) (Robert Nagy) #46929 test: * unflake test-vm-timeout-escape-nexttick (Santiago Gimeno) #48078 test_runner: * (SEMVER-MINOR) add shorthands to `test` (Chemi Atlow) #47909 * (SEMVER-MINOR) support combining coverage reports (Colin Ihrig) #47686 * (SEMVER-MINOR) execute before hook on test (Chemi Atlow) #47586 * (SEMVER-MINOR) expose reporter for use in run api (Chemi Atlow) #47238 tools: * update LICENSE and license-builder.sh (Santiago Gimeno) #48078 url: * drop ICU requirement for parsing hostnames (Yagiz Nizipli) #47339 * use ada::url_aggregator for parsing urls (Yagiz Nizipli) #47339 * (SEMVER-MINOR) implement URL.canParse (Matthew Aitken) #47179 wasi: * (SEMVER-MINOR) no longer require flag to enable wasi (Michael Dawson) #47286 PR-URL: #48694

Notable changes: Ada 2.0 Node.js v18.17.0 comes with the latest version of the URL parser, Ada. This update brings significant performance improvements to URL parsing, including enhancements to the url.domainToASCII and url.domainToUnicode functions in node:url. Ada 2.0 has been integrated into the Node.js codebase, ensuring that all parts of the application can benefit from the improved performance. Additionally, Ada 2.0 features a significant performance boost over its predecessor, Ada 1.0.4, while also eliminating the need for the ICU requirement for URL hostname parsing. Contributed by Yagiz Nizipli and Daniel Lemire in #47339 Web Crypto API Web Crypto API functions' arguments are now coerced and validated as per their WebIDL definitions like in other Web Crypto API implementations. This further improves interoperability with other implementations of Web Crypto API. Contributed by Filip Skokan in #46067 crypto: * update root certificates to NSS 3.89 (Node.js GitHub Bot) #47659 dns: * (SEMVER-MINOR) expose getDefaultResultOrder (btea) #46973 doc: * add ovflowd to collaborators (Claudio Wunder) #47844 * add KhafraDev to collaborators (Matthew Aitken) #47510 * events: * (SEMVER-MINOR) add getMaxListeners method (Matthew Aitken) #47039 fs: * (SEMVER-MINOR) add support for mode flag to specify the copy behavior (Tetsuharu Ohzeki) #47084 * (SEMVER-MINOR) add recursive option to readdir and opendir (Ethan Arrowood) #41439 * (SEMVER-MINOR) add support for mode flag to specify the copy behavior (Tetsuharu Ohzeki) #47084 * (SEMVER-MINOR) implement byob mode for readableWebStream() (Debadree Chatterjee) #46933 http: * (SEMVER-MINOR) prevent writing to the body when not allowed by HTTP spec (Gerrard Lindsay) #47732 * (SEMVER-MINOR) remove internal error in assignSocket (Matteo Collina) #47723 * (SEMVER-MINOR) add highWaterMark opt in http.createServer (HinataKah0) #47405 lib: * (SEMVER-MINOR) add webstreams to Duplex.from() (Debadree Chatterjee) #46190 module: * change default resolver to not throw on unknown scheme (Gil Tayar) #47824 node-api: * (SEMVER-MINOR) define version 9 (Chengzhong Wu) #48151 * (SEMVER-MINOR) deprecate napi_module_register (Vladimir Morozov) #46319 stream: * (SEMVER-MINOR) preserve object mode in compose (Raz Luvaton) #47413 * (SEMVER-MINOR) add setter & getter for default highWaterMark (#46929) (Robert Nagy) #46929 test: * unflake test-vm-timeout-escape-nexttick (Santiago Gimeno) #48078 test_runner: * (SEMVER-MINOR) add shorthands to `test` (Chemi Atlow) #47909 * (SEMVER-MINOR) support combining coverage reports (Colin Ihrig) #47686 * (SEMVER-MINOR) execute before hook on test (Chemi Atlow) #47586 * (SEMVER-MINOR) expose reporter for use in run api (Chemi Atlow) #47238 tools: * update LICENSE and license-builder.sh (Santiago Gimeno) #48078 url: * (SEMVER-MINOR) implement URL.canParse (Matthew Aitken) #47179 wasi: * (SEMVER-MINOR) no longer require flag to enable wasi (Michael Dawson) #47286 PR-URL: #48694

Notable changes: Ada 2.0 Node.js v18.17.0 comes with the latest version of the URL parser, Ada. This update brings significant performance improvements to URL parsing, including enhancements to the url.domainToASCII and url.domainToUnicode functions in node:url. Ada 2.0 has been integrated into the Node.js codebase, ensuring that all parts of the application can benefit from the improved performance. Additionally, Ada 2.0 features a significant performance boost over its predecessor, Ada 1.0.4, while also eliminating the need for the ICU requirement for URL hostname parsing. Contributed by Yagiz Nizipli and Daniel Lemire in #47339 Web Crypto API Web Crypto API functions' arguments are now coerced and validated as per their WebIDL definitions like in other Web Crypto API implementations. This further improves interoperability with other implementations of Web Crypto API. Contributed by Filip Skokan in #46067 crypto: * update root certificates to NSS 3.89 (Node.js GitHub Bot) #47659 dns: * (SEMVER-MINOR) expose getDefaultResultOrder (btea) #46973 doc: * add ovflowd to collaborators (Claudio Wunder) #47844 * add KhafraDev to collaborators (Matthew Aitken) #47510 * events: * (SEMVER-MINOR) add getMaxListeners method (Matthew Aitken) #47039 fs: * (SEMVER-MINOR) add support for mode flag to specify the copy behavior (Tetsuharu Ohzeki) #47084 * (SEMVER-MINOR) add recursive option to readdir and opendir (Ethan Arrowood) #41439 * (SEMVER-MINOR) add support for mode flag to specify the copy behavior (Tetsuharu Ohzeki) #47084 * (SEMVER-MINOR) implement byob mode for readableWebStream() (Debadree Chatterjee) #46933 http: * (SEMVER-MINOR) prevent writing to the body when not allowed by HTTP spec (Gerrard Lindsay) #47732 * (SEMVER-MINOR) remove internal error in assignSocket (Matteo Collina) #47723 * (SEMVER-MINOR) add highWaterMark opt in http.createServer (HinataKah0) #47405 lib: * (SEMVER-MINOR) add webstreams to Duplex.from() (Debadree Chatterjee) #46190 * (SEMVER-MINOR) implement AbortSignal.any() (Chemi Atlow) #47821 module: * change default resolver to not throw on unknown scheme (Gil Tayar) #47824 node-api: * (SEMVER-MINOR) define version 9 (Chengzhong Wu) #48151 * (SEMVER-MINOR) deprecate napi_module_register (Vladimir Morozov) #46319 stream: * (SEMVER-MINOR) preserve object mode in compose (Raz Luvaton) #47413 * (SEMVER-MINOR) add setter & getter for default highWaterMark (#46929) (Robert Nagy) #46929 test: * unflake test-vm-timeout-escape-nexttick (Santiago Gimeno) #48078 test_runner: * (SEMVER-MINOR) add shorthands to `test` (Chemi Atlow) #47909 * (SEMVER-MINOR) support combining coverage reports (Colin Ihrig) #47686 * (SEMVER-MINOR) execute before hook on test (Chemi Atlow) #47586 * (SEMVER-MINOR) expose reporter for use in run api (Chemi Atlow) #47238 tools: * update LICENSE and license-builder.sh (Santiago Gimeno) #48078 url: * (SEMVER-MINOR) implement URL.canParse (Matthew Aitken) #47179 wasi: * (SEMVER-MINOR) no longer require flag to enable wasi (Michael Dawson) #47286 PR-URL: #48694

Notable changes: Ada 2.0 Node.js v18.17.0 comes with the latest version of the URL parser, Ada. This update brings significant performance improvements to URL parsing, including enhancements to the url.domainToASCII and url.domainToUnicode functions in node:url. Ada 2.0 has been integrated into the Node.js codebase, ensuring that all parts of the application can benefit from the improved performance. Additionally, Ada 2.0 features a significant performance boost over its predecessor, Ada 1.0.4, while also eliminating the need for the ICU requirement for URL hostname parsing. Contributed by Yagiz Nizipli and Daniel Lemire in nodejs#47339 Web Crypto API Web Crypto API functions' arguments are now coerced and validated as per their WebIDL definitions like in other Web Crypto API implementations. This further improves interoperability with other implementations of Web Crypto API. Contributed by Filip Skokan in nodejs#46067 crypto: * update root certificates to NSS 3.89 (Node.js GitHub Bot) nodejs#47659 dns: * (SEMVER-MINOR) expose getDefaultResultOrder (btea) nodejs#46973 doc: * add ovflowd to collaborators (Claudio Wunder) nodejs#47844 * add KhafraDev to collaborators (Matthew Aitken) nodejs#47510 * events: * (SEMVER-MINOR) add getMaxListeners method (Matthew Aitken) nodejs#47039 fs: * (SEMVER-MINOR) add support for mode flag to specify the copy behavior (Tetsuharu Ohzeki) nodejs#47084 * (SEMVER-MINOR) add recursive option to readdir and opendir (Ethan Arrowood) nodejs#41439 * (SEMVER-MINOR) add support for mode flag to specify the copy behavior (Tetsuharu Ohzeki) nodejs#47084 * (SEMVER-MINOR) implement byob mode for readableWebStream() (Debadree Chatterjee) nodejs#46933 http: * (SEMVER-MINOR) prevent writing to the body when not allowed by HTTP spec (Gerrard Lindsay) nodejs#47732 * (SEMVER-MINOR) remove internal error in assignSocket (Matteo Collina) nodejs#47723 * (SEMVER-MINOR) add highWaterMark opt in http.createServer (HinataKah0) nodejs#47405 lib: * (SEMVER-MINOR) add webstreams to Duplex.from() (Debadree Chatterjee) nodejs#46190 * (SEMVER-MINOR) implement AbortSignal.any() (Chemi Atlow) nodejs#47821 module: * change default resolver to not throw on unknown scheme (Gil Tayar) nodejs#47824 node-api: * (SEMVER-MINOR) define version 9 (Chengzhong Wu) nodejs#48151 * (SEMVER-MINOR) deprecate napi_module_register (Vladimir Morozov) nodejs#46319 stream: * (SEMVER-MINOR) preserve object mode in compose (Raz Luvaton) nodejs#47413 * (SEMVER-MINOR) add setter & getter for default highWaterMark (nodejs#46929) (Robert Nagy) nodejs#46929 test: * unflake test-vm-timeout-escape-nexttick (Santiago Gimeno) nodejs#48078 test_runner: * (SEMVER-MINOR) add shorthands to `test` (Chemi Atlow) nodejs#47909 * (SEMVER-MINOR) support combining coverage reports (Colin Ihrig) nodejs#47686 * (SEMVER-MINOR) execute before hook on test (Chemi Atlow) nodejs#47586 * (SEMVER-MINOR) expose reporter for use in run api (Chemi Atlow) nodejs#47238 tools: * update LICENSE and license-builder.sh (Santiago Gimeno) nodejs#48078 url: * (SEMVER-MINOR) implement URL.canParse (Matthew Aitken) nodejs#47179 wasi: * (SEMVER-MINOR) no longer require flag to enable wasi (Michael Dawson) nodejs#47286 PR-URL: nodejs#48694

events: add getMaxListeners method

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docs: add note about warning

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KhafraDev deleted the events-getmaxlisteners branch March 19, 2023 13:22

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CI Reliability 2023-03-20 nodejs/reliability#530

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RafaelGSS mentioned this pull request Apr 3, 2023

2023-04-18, Version 20.0.0 (Current) #47381

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events: add getMaxListeners method

596e04a

PR-URL: #47039 Reviewed-By: Debadree Chatterjee <debadree333@gmail.com> Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

RafaelGSS mentioned this pull request Apr 6, 2023

v19.9.0 proposal #47441

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events: add getMaxListeners method

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PR-URL: #47039 Reviewed-By: Debadree Chatterjee <debadree333@gmail.com> Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

debadree25 mentioned this pull request Apr 8, 2023

MaxListenersExceededWarning: Possible EventTarget memory leak detected. 101 abort listeners added to [AbortSignal] #47449

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danielleadams pushed a commit that referenced this pull request Jul 6, 2023

events: add getMaxListeners method

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PR-URL: #47039 Reviewed-By: Debadree Chatterjee <debadree333@gmail.com> Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

danielleadams mentioned this pull request Jul 10, 2023

v18.17.0 release proposal #48694

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mcollina mentioned this pull request Sep 4, 2024

Expose setMaxListeners property on AbortSignal #54758

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