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3bd6a82e 1<!DOCTYPE html><html class="default" lang="en"><head><meta charSet="utf-8"/><meta http-equiv="x-ua-compatible" content="IE=edge"/><title>PoolEmitter | poolifier</title><meta name="description" content="Documentation for poolifier"/><meta name="viewport" content="width=device-width, initial-scale=1"/><link rel="stylesheet" href="../assets/style.css"/><link rel="stylesheet" href="../assets/highlight.css"/><script defer src="../assets/main.js"></script><script async src="../assets/search.js" id="tsd-search-script"></script></head><body><script>document.documentElement.dataset.theme = localStorage.getItem("tsd-theme") || "os"</script><header class="tsd-page-toolbar">
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14<ul class="tsd-breadcrumb">
15<li><a href="../index.html">poolifier</a></li>
16<li><a href="PoolEmitter.html">PoolEmitter</a></li></ul>
17<h1>Class PoolEmitter</h1></div>
18<section class="tsd-panel tsd-comment">
19<div class="tsd-comment tsd-typography"><p>Pool events emitter.</p>
20</div></section>
21<section class="tsd-panel tsd-hierarchy">
22<h4>Hierarchy</h4>
23<ul class="tsd-hierarchy">
3bd6a82e 24<li><span class="tsd-signature-type ">EventEmitter</span>
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25<ul class="tsd-hierarchy">
26<li><span class="target">PoolEmitter</span></li></ul></li></ul></section><aside class="tsd-sources">
27<ul>
184d530f 28<li>Defined in <a href="https://github.com/poolifier/poolifier/blob/dea903a/src/pools/pool.ts#L50">src/pools/pool.ts:50</a></li></ul></aside>
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29<section class="tsd-panel-group tsd-index-group">
30<section class="tsd-panel tsd-index-panel">
31<details class="tsd-index-content tsd-index-accordion" open><summary class="tsd-accordion-summary tsd-index-summary">
32<h5 class="tsd-index-heading uppercase" role="button" aria-expanded="false" tabIndex=0><svg width="16" height="16" viewBox="0 0 16 16" fill="none"><path d="M1.5 5.50969L8 11.6609L14.5 5.50969L12.5466 3.66086L8 7.96494L3.45341 3.66086L1.5 5.50969Z" fill="var(--color-text)"></path></svg> Index</h5></summary>
33<div class="tsd-accordion-details">
34<section class="tsd-index-section">
35<h3 class="tsd-index-heading">Constructors</h3>
3bd6a82e 36<div class="tsd-index-list"><a href="PoolEmitter.html#constructor" class="tsd-index-link tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><rect fill="var(--color-icon-background)" stroke="#4D7FFF" stroke-width="1.5" x="1" y="1" width="22" height="22" rx="12" id="icon-512-path"></rect><path d="M11.898 16.1201C11.098 16.1201 10.466 15.8961 10.002 15.4481C9.53803 15.0001 9.30603 14.3841 9.30603 13.6001V9.64012C9.30603 8.85612 9.53803 8.24012 10.002 7.79212C10.466 7.34412 11.098 7.12012 11.898 7.12012C12.682 7.12012 13.306 7.34812 13.77 7.80412C14.234 8.25212 14.466 8.86412 14.466 9.64012H13.386C13.386 9.14412 13.254 8.76412 12.99 8.50012C12.734 8.22812 12.37 8.09212 11.898 8.09212C11.426 8.09212 11.054 8.22412 10.782 8.48812C10.518 8.75212 10.386 9.13212 10.386 9.62812V13.6001C10.386 14.0961 10.518 14.4801 10.782 14.7521C11.054 15.0161 11.426 15.1481 11.898 15.1481C12.37 15.1481 12.734 15.0161 12.99 14.7521C13.254 14.4801 13.386 14.0961 13.386 13.6001H14.466C14.466 14.3761 14.234 14.9921 13.77 15.4481C13.306 15.8961 12.682 16.1201 11.898 16.1201Z" fill="var(--color-text)" id="icon-512-text"></path></svg><span>constructor</span></a>
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37</div></section>
38<section class="tsd-index-section">
39<h3 class="tsd-index-heading">Properties</h3>
3bd6a82e 40<div class="tsd-index-list"><a href="PoolEmitter.html#captureRejectionSymbol" class="tsd-index-link tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><rect fill="var(--color-icon-background)" stroke="#FF984D" stroke-width="1.5" x="1" y="1" width="22" height="22" rx="12" id="icon-1024-path"></rect><path d="M9.354 16V7.24H12.174C12.99 7.24 13.638 7.476 14.118 7.948C14.606 8.412 14.85 9.036 14.85 9.82C14.85 10.604 14.606 11.232 14.118 11.704C13.638 12.168 12.99 12.4 12.174 12.4H10.434V16H9.354ZM10.434 11.428H12.174C12.646 11.428 13.022 11.284 13.302 10.996C13.59 10.7 13.734 10.308 13.734 9.82C13.734 9.324 13.59 8.932 13.302 8.644C13.022 8.356 12.646 8.212 12.174 8.212H10.434V11.428Z" fill="var(--color-text)" id="icon-1024-text"></path></svg><span>capture<wbr/>Rejection<wbr/>Symbol</span></a>
41<a href="PoolEmitter.html#captureRejections" class="tsd-index-link tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-1024-path"></use><use href="#icon-1024-text"></use></svg><span>capture<wbr/>Rejections</span></a>
42<a href="PoolEmitter.html#defaultMaxListeners" class="tsd-index-link tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-1024-path"></use><use href="#icon-1024-text"></use></svg><span>default<wbr/>Max<wbr/>Listeners</span></a>
43<a href="PoolEmitter.html#errorMonitor" class="tsd-index-link tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-1024-path"></use><use href="#icon-1024-text"></use></svg><span>error<wbr/>Monitor</span></a>
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44</div></section>
45<section class="tsd-index-section">
46<h3 class="tsd-index-heading">Methods</h3>
3bd6a82e 47<div class="tsd-index-list"><a href="PoolEmitter.html#addListener" class="tsd-index-link tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><rect fill="var(--color-icon-background)" stroke="#FF4DB8" stroke-width="1.5" x="1" y="1" width="22" height="22" rx="12" id="icon-2048-path"></rect><path d="M9.162 16V7.24H10.578L11.514 10.072C11.602 10.328 11.674 10.584 11.73 10.84C11.794 11.088 11.842 11.28 11.874 11.416C11.906 11.28 11.954 11.088 12.018 10.84C12.082 10.584 12.154 10.324 12.234 10.06L13.122 7.24H14.538V16H13.482V12.82C13.482 12.468 13.49 12.068 13.506 11.62C13.53 11.172 13.558 10.716 13.59 10.252C13.622 9.78 13.654 9.332 13.686 8.908C13.726 8.476 13.762 8.1 13.794 7.78L12.366 12.16H11.334L9.894 7.78C9.934 8.092 9.97 8.456 10.002 8.872C10.042 9.28 10.078 9.716 10.11 10.18C10.142 10.636 10.166 11.092 10.182 11.548C10.206 12.004 10.218 12.428 10.218 12.82V16H9.162Z" fill="var(--color-text)" id="icon-2048-text"></path></svg><span>add<wbr/>Listener</span></a>
48<a href="PoolEmitter.html#emit" class="tsd-index-link tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>emit</span></a>
49<a href="PoolEmitter.html#eventNames" class="tsd-index-link tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>event<wbr/>Names</span></a>
50<a href="PoolEmitter.html#getMaxListeners" class="tsd-index-link tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>get<wbr/>Max<wbr/>Listeners</span></a>
51<a href="PoolEmitter.html#listenerCount" class="tsd-index-link tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>listener<wbr/>Count</span></a>
52<a href="PoolEmitter.html#listeners" class="tsd-index-link tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>listeners</span></a>
53<a href="PoolEmitter.html#off" class="tsd-index-link tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>off</span></a>
54<a href="PoolEmitter.html#on" class="tsd-index-link tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>on</span></a>
55<a href="PoolEmitter.html#once" class="tsd-index-link tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>once</span></a>
56<a href="PoolEmitter.html#prependListener" class="tsd-index-link tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>prepend<wbr/>Listener</span></a>
57<a href="PoolEmitter.html#prependOnceListener" class="tsd-index-link tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>prepend<wbr/>Once<wbr/>Listener</span></a>
58<a href="PoolEmitter.html#rawListeners" class="tsd-index-link tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>raw<wbr/>Listeners</span></a>
59<a href="PoolEmitter.html#removeAllListeners" class="tsd-index-link tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>remove<wbr/>All<wbr/>Listeners</span></a>
60<a href="PoolEmitter.html#removeListener" class="tsd-index-link tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>remove<wbr/>Listener</span></a>
61<a href="PoolEmitter.html#setMaxListeners" class="tsd-index-link tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>set<wbr/>Max<wbr/>Listeners</span></a>
62<a href="PoolEmitter.html#getEventListeners" class="tsd-index-link tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>get<wbr/>Event<wbr/>Listeners</span></a>
63<a href="PoolEmitter.html#listenerCount-2" class="tsd-index-link tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>listener<wbr/>Count</span></a>
64<a href="PoolEmitter.html#on-2" class="tsd-index-link tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>on</span></a>
65<a href="PoolEmitter.html#once-2" class="tsd-index-link tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>once</span></a>
66<a href="PoolEmitter.html#setMaxListeners-2" class="tsd-index-link tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>set<wbr/>Max<wbr/>Listeners</span></a>
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67</div></section></div></details></section></section>
68<section class="tsd-panel-group tsd-member-group">
69<h2>Constructors</h2>
3bd6a82e 70<section class="tsd-panel tsd-member tsd-is-inherited tsd-is-external"><a id="constructor" class="tsd-anchor"></a>
41015374 71<h3 class="tsd-anchor-link"><span>constructor</span><a href="#constructor" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z" fill="none" id="icon-anchor-a"></path><path d="M10 14a3.5 3.5 0 0 0 5 0l4 -4a3.5 3.5 0 0 0 -5 -5l-.5 .5" id="icon-anchor-b"></path><path d="M14 10a3.5 3.5 0 0 0 -5 0l-4 4a3.5 3.5 0 0 0 5 5l.5 -.5" id="icon-anchor-c"></path></svg></a></h3>
3bd6a82e 72<ul class="tsd-signatures tsd-is-inherited tsd-is-external">
8d1797ad 73<li class="tsd-signature tsd-anchor-link" id="constructor.new_PoolEmitter"><span class="tsd-kind-constructor-signature">new <wbr/>Pool<wbr/>Emitter</span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">options</span><span class="tsd-signature-symbol">?</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><a href="PoolEmitter.html" class="tsd-signature-type tsd-kind-class">PoolEmitter</a><a href="#constructor.new_PoolEmitter" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></li>
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74<li class="tsd-description">
75<div class="tsd-parameters">
76<h4 class="tsd-parameters-title">Parameters</h4>
77<ul class="tsd-parameter-list">
78<li>
3bd6a82e 79<h5><code class="tsd-tag ts-flagOptional">Optional</code> <span class="tsd-kind-parameter">options</span>: <span class="tsd-signature-type ">EventEmitterOptions</span></h5></li></ul></div>
8d1797ad 80<h4 class="tsd-returns-title">Returns <a href="PoolEmitter.html" class="tsd-signature-type tsd-kind-class">PoolEmitter</a></h4><aside class="tsd-sources">
811dc01f 81<p>Inherited from EventEmitterAsyncResource.constructor</p>
41015374 82<ul>
811dc01f 83<li>Defined in node_modules/.pnpm/@types+node@20.2.5/node_modules/@types/node/events.d.ts:109</li></ul></aside></li></ul></section></section>
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84<section class="tsd-panel-group tsd-member-group">
85<h2>Properties</h2>
3bd6a82e 86<section class="tsd-panel tsd-member tsd-is-inherited tsd-is-external"><a id="captureRejectionSymbol" class="tsd-anchor"></a>
41015374 87<h3 class="tsd-anchor-link"><code class="tsd-tag ts-flagStatic">Static</code> <code class="tsd-tag ts-flagReadonly">Readonly</code> <span>capture<wbr/>Rejection<wbr/>Symbol</span><a href="#captureRejectionSymbol" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></h3>
811dc01f 88<div class="tsd-signature"><span class="tsd-kind-property">capture<wbr/>Rejection<wbr/>Symbol</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">typeof </span><a href="PoolEmitter.html#captureRejectionSymbol" class="tsd-signature-type tsd-kind-property">captureRejectionSymbol</a></div>
89<div class="tsd-comment tsd-typography"><p>Value: <code>Symbol.for(&#39;nodejs.rejection&#39;)</code></p>
90<p>See how to write a custom <code>rejection handler</code>.</p>
91
92<h3>Since</h3><p>v13.4.0, v12.16.0</p>
93</div><aside class="tsd-sources">
94<p>Inherited from EventEmitterAsyncResource.captureRejectionSymbol</p>
41015374 95<ul>
811dc01f 96<li>Defined in node_modules/.pnpm/@types+node@20.2.5/node_modules/@types/node/events.d.ts:326</li></ul></aside></section>
3bd6a82e 97<section class="tsd-panel tsd-member tsd-is-inherited tsd-is-external"><a id="captureRejections" class="tsd-anchor"></a>
41015374 98<h3 class="tsd-anchor-link"><code class="tsd-tag ts-flagStatic">Static</code> <span>capture<wbr/>Rejections</span><a href="#captureRejections" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></h3>
8d1797ad 99<div class="tsd-signature"><span class="tsd-kind-property">capture<wbr/>Rejections</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">boolean</span></div>
811dc01f 100<div class="tsd-comment tsd-typography"><p>Value: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type">boolean</a></p>
101<p>Change the default <code>captureRejections</code> option on all new <code>EventEmitter</code> objects.</p>
102
103<h3>Since</h3><p>v13.4.0, v12.16.0</p>
41015374 104</div><aside class="tsd-sources">
811dc01f 105<p>Inherited from EventEmitterAsyncResource.captureRejections</p>
41015374 106<ul>
811dc01f 107<li>Defined in node_modules/.pnpm/@types+node@20.2.5/node_modules/@types/node/events.d.ts:333</li></ul></aside></section>
3bd6a82e 108<section class="tsd-panel tsd-member tsd-is-inherited tsd-is-external"><a id="defaultMaxListeners" class="tsd-anchor"></a>
41015374 109<h3 class="tsd-anchor-link"><code class="tsd-tag ts-flagStatic">Static</code> <span>default<wbr/>Max<wbr/>Listeners</span><a href="#defaultMaxListeners" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></h3>
811dc01f 110<div class="tsd-signature"><span class="tsd-kind-property">default<wbr/>Max<wbr/>Listeners</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">number</span></div>
111<div class="tsd-comment tsd-typography"><p>By default, a maximum of <code>10</code> listeners can be registered for any single
112event. This limit can be changed for individual <code>EventEmitter</code> instances
113using the <code>emitter.setMaxListeners(n)</code> method. To change the default
114for <em>all</em><code>EventEmitter</code> instances, the <code>events.defaultMaxListeners</code>property can be used. If this value is not a positive number, a <code>RangeError</code>is thrown.</p>
115<p>Take caution when setting the <code>events.defaultMaxListeners</code> because the
116change affects <em>all</em><code>EventEmitter</code> instances, including those created before
117the change is made. However, calling <code>emitter.setMaxListeners(n)</code> still has
118precedence over <code>events.defaultMaxListeners</code>.</p>
119<p>This is not a hard limit. The <code>EventEmitter</code> instance will allow
120more listeners to be added but will output a trace warning to stderr indicating
121that a &quot;possible EventEmitter memory leak&quot; has been detected. For any single<code>EventEmitter</code>, the <code>emitter.getMaxListeners()</code> and <code>emitter.setMaxListeners()</code>methods can be used to
122temporarily avoid this warning:</p>
123<pre><code class="language-js"><span class="hl-5">import</span><span class="hl-0"> { </span><span class="hl-3">EventEmitter</span><span class="hl-0"> } </span><span class="hl-5">from</span><span class="hl-0"> </span><span class="hl-6">&#39;node:events&#39;</span><span class="hl-0">;</span><br/><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-7">emitter</span><span class="hl-0"> = </span><span class="hl-4">new</span><span class="hl-0"> </span><span class="hl-2">EventEmitter</span><span class="hl-0">();</span><br/><span class="hl-3">emitter</span><span class="hl-0">.</span><span class="hl-2">setMaxListeners</span><span class="hl-0">(</span><span class="hl-3">emitter</span><span class="hl-0">.</span><span class="hl-2">getMaxListeners</span><span class="hl-0">() + </span><span class="hl-1">1</span><span class="hl-0">);</span><br/><span class="hl-3">emitter</span><span class="hl-0">.</span><span class="hl-2">once</span><span class="hl-0">(</span><span class="hl-6">&#39;event&#39;</span><span class="hl-0">, () </span><span class="hl-4">=&gt;</span><span class="hl-0"> {</span><br/><span class="hl-0"> </span><span class="hl-8">// do stuff</span><br/><span class="hl-0"> </span><span class="hl-3">emitter</span><span class="hl-0">.</span><span class="hl-2">setMaxListeners</span><span class="hl-0">(</span><span class="hl-3">Math</span><span class="hl-0">.</span><span class="hl-2">max</span><span class="hl-0">(</span><span class="hl-3">emitter</span><span class="hl-0">.</span><span class="hl-2">getMaxListeners</span><span class="hl-0">() - </span><span class="hl-1">1</span><span class="hl-0">, </span><span class="hl-1">0</span><span class="hl-0">));</span><br/><span class="hl-0">});</span>
124</code><button>Copy</button></pre>
125<p>The <code>--trace-warnings</code> command-line flag can be used to display the
126stack trace for such warnings.</p>
127<p>The emitted warning can be inspected with <code>process.on(&#39;warning&#39;)</code> and will
128have the additional <code>emitter</code>, <code>type</code>, and <code>count</code> properties, referring to
129the event emitter instance, the event&#39;s name and the number of attached
130listeners, respectively.
131Its <code>name</code> property is set to <code>&#39;MaxListenersExceededWarning&#39;</code>.</p>
132
133<h3>Since</h3><p>v0.11.2</p>
134</div><aside class="tsd-sources">
135<p>Inherited from EventEmitterAsyncResource.defaultMaxListeners</p>
41015374 136<ul>
811dc01f 137<li>Defined in node_modules/.pnpm/@types+node@20.2.5/node_modules/@types/node/events.d.ts:370</li></ul></aside></section>
3bd6a82e 138<section class="tsd-panel tsd-member tsd-is-inherited tsd-is-external"><a id="errorMonitor" class="tsd-anchor"></a>
41015374 139<h3 class="tsd-anchor-link"><code class="tsd-tag ts-flagStatic">Static</code> <code class="tsd-tag ts-flagReadonly">Readonly</code> <span>error<wbr/>Monitor</span><a href="#errorMonitor" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></h3>
8d1797ad 140<div class="tsd-signature"><span class="tsd-kind-property">error<wbr/>Monitor</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">typeof </span><a href="PoolEmitter.html#errorMonitor" class="tsd-signature-type tsd-kind-property">errorMonitor</a></div>
811dc01f 141<div class="tsd-comment tsd-typography"><p>This symbol shall be used to install a listener for only monitoring <code>&#39;error&#39;</code>events. Listeners installed using this symbol are called before the regular<code>&#39;error&#39;</code> listeners are called.</p>
142<p>Installing a listener using this symbol does not change the behavior once an<code>&#39;error&#39;</code> event is emitted. Therefore, the process will still crash if no
41015374 143regular <code>&#39;error&#39;</code> listener is installed.</p>
811dc01f 144
145<h3>Since</h3><p>v13.6.0, v12.17.0</p>
41015374 146</div><aside class="tsd-sources">
811dc01f 147<p>Inherited from EventEmitterAsyncResource.errorMonitor</p>
41015374 148<ul>
811dc01f 149<li>Defined in node_modules/.pnpm/@types+node@20.2.5/node_modules/@types/node/events.d.ts:319</li></ul></aside></section></section>
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150<section class="tsd-panel-group tsd-member-group">
151<h2>Methods</h2>
3bd6a82e 152<section class="tsd-panel tsd-member tsd-is-inherited tsd-is-external"><a id="addListener" class="tsd-anchor"></a>
41015374 153<h3 class="tsd-anchor-link"><span>add<wbr/>Listener</span><a href="#addListener" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></h3>
3bd6a82e 154<ul class="tsd-signatures tsd-is-inherited tsd-is-external">
8d1797ad 155<li class="tsd-signature tsd-anchor-link" id="addListener.addListener-1"><span class="tsd-kind-call-signature">add<wbr/>Listener</span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">eventName</span>, <span class="tsd-kind-parameter">listener</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><a href="PoolEmitter.html" class="tsd-signature-type tsd-kind-class">PoolEmitter</a><a href="#addListener.addListener-1" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></li>
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156<li class="tsd-description">
157<div class="tsd-comment tsd-typography"><p>Alias for <code>emitter.on(eventName, listener)</code>.</p>
158
159<h3>Since</h3><p>v0.1.26</p>
160</div>
161<div class="tsd-parameters">
162<h4 class="tsd-parameters-title">Parameters</h4>
163<ul class="tsd-parameter-list">
164<li>
3bd6a82e 165<h5><span class="tsd-kind-parameter">eventName</span>: <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type">symbol</span></h5></li>
41015374 166<li>
3bd6a82e 167<h5><span class="tsd-kind-parameter">listener</span>: <span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol"> =&gt; </span><span class="tsd-signature-type">void</span><span class="tsd-signature-symbol">)</span></h5>
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168<ul class="tsd-parameters">
169<li class="tsd-parameter-signature">
3bd6a82e 170<ul class="tsd-signatures tsd-is-external">
171<li class="tsd-signature"><span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">void</span></li>
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172<li class="tsd-description">
173<div class="tsd-parameters">
174<h4 class="tsd-parameters-title">Parameters</h4>
175<ul class="tsd-parameter-list">
176<li>
3bd6a82e 177<h5><code class="tsd-tag ts-flagRest">Rest</code> <span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span>: <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span></h5></li></ul></div>
41015374 178<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">void</span></h4></li></ul></li></ul></li></ul></div>
8d1797ad 179<h4 class="tsd-returns-title">Returns <a href="PoolEmitter.html" class="tsd-signature-type tsd-kind-class">PoolEmitter</a></h4><aside class="tsd-sources">
811dc01f 180<p>Inherited from EventEmitterAsyncResource.addListener</p>
41015374 181<ul>
811dc01f 182<li>Defined in node_modules/.pnpm/@types+node@20.2.5/node_modules/@types/node/events.d.ts:390</li></ul></aside></li></ul></section>
3bd6a82e 183<section class="tsd-panel tsd-member tsd-is-inherited tsd-is-external"><a id="emit" class="tsd-anchor"></a>
41015374 184<h3 class="tsd-anchor-link"><span>emit</span><a href="#emit" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></h3>
3bd6a82e 185<ul class="tsd-signatures tsd-is-inherited tsd-is-external">
8d1797ad 186<li class="tsd-signature tsd-anchor-link" id="emit.emit-1"><span class="tsd-kind-call-signature">emit</span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">eventName</span>, <span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">boolean</span><a href="#emit.emit-1" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></li>
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187<li class="tsd-description">
188<div class="tsd-comment tsd-typography"><p>Synchronously calls each of the listeners registered for the event named<code>eventName</code>, in the order they were registered, passing the supplied arguments
189to each.</p>
190<p>Returns <code>true</code> if the event had listeners, <code>false</code> otherwise.</p>
2c94c3a5 191<pre><code class="language-js"><span class="hl-5">import</span><span class="hl-0"> { </span><span class="hl-3">EventEmitter</span><span class="hl-0"> } </span><span class="hl-5">from</span><span class="hl-0"> </span><span class="hl-6">&#39;node:events&#39;</span><span class="hl-0">;</span><br/><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-7">myEmitter</span><span class="hl-0"> = </span><span class="hl-4">new</span><span class="hl-0"> </span><span class="hl-2">EventEmitter</span><span class="hl-0">();</span><br/><br/><span class="hl-8">// First listener</span><br/><span class="hl-3">myEmitter</span><span class="hl-0">.</span><span class="hl-2">on</span><span class="hl-0">(</span><span class="hl-6">&#39;event&#39;</span><span class="hl-0">, </span><span class="hl-4">function</span><span class="hl-0"> </span><span class="hl-2">firstListener</span><span class="hl-0">() {</span><br/><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-6">&#39;Helloooo! first listener&#39;</span><span class="hl-0">);</span><br/><span class="hl-0">});</span><br/><span class="hl-8">// Second listener</span><br/><span class="hl-3">myEmitter</span><span class="hl-0">.</span><span class="hl-2">on</span><span class="hl-0">(</span><span class="hl-6">&#39;event&#39;</span><span class="hl-0">, </span><span class="hl-4">function</span><span class="hl-0"> </span><span class="hl-2">secondListener</span><span class="hl-0">(</span><span class="hl-3">arg1</span><span class="hl-0">, </span><span class="hl-3">arg2</span><span class="hl-0">) {</span><br/><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-6">`event with parameters </span><span class="hl-4">${</span><span class="hl-3">arg1</span><span class="hl-4">}</span><span class="hl-6">, </span><span class="hl-4">${</span><span class="hl-3">arg2</span><span class="hl-4">}</span><span class="hl-6"> in second listener`</span><span class="hl-0">);</span><br/><span class="hl-0">});</span><br/><span class="hl-8">// Third listener</span><br/><span class="hl-3">myEmitter</span><span class="hl-0">.</span><span class="hl-2">on</span><span class="hl-0">(</span><span class="hl-6">&#39;event&#39;</span><span class="hl-0">, </span><span class="hl-4">function</span><span class="hl-0"> </span><span class="hl-2">thirdListener</span><span class="hl-0">(...</span><span class="hl-3">args</span><span class="hl-0">) {</span><br/><span class="hl-0"> </span><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-7">parameters</span><span class="hl-0"> = </span><span class="hl-3">args</span><span class="hl-0">.</span><span class="hl-2">join</span><span class="hl-0">(</span><span class="hl-6">&#39;, &#39;</span><span class="hl-0">);</span><br/><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-6">`event with parameters </span><span class="hl-4">${</span><span class="hl-3">parameters</span><span class="hl-4">}</span><span class="hl-6"> in third listener`</span><span class="hl-0">);</span><br/><span class="hl-0">});</span><br/><br/><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-3">myEmitter</span><span class="hl-0">.</span><span class="hl-2">listeners</span><span class="hl-0">(</span><span class="hl-6">&#39;event&#39;</span><span class="hl-0">));</span><br/><br/><span class="hl-3">myEmitter</span><span class="hl-0">.</span><span class="hl-2">emit</span><span class="hl-0">(</span><span class="hl-6">&#39;event&#39;</span><span class="hl-0">, </span><span class="hl-1">1</span><span class="hl-0">, </span><span class="hl-1">2</span><span class="hl-0">, </span><span class="hl-1">3</span><span class="hl-0">, </span><span class="hl-1">4</span><span class="hl-0">, </span><span class="hl-1">5</span><span class="hl-0">);</span><br/><br/><span class="hl-8">// Prints:</span><br/><span class="hl-8">// [</span><br/><span class="hl-8">// [Function: firstListener],</span><br/><span class="hl-8">// [Function: secondListener],</span><br/><span class="hl-8">// [Function: thirdListener]</span><br/><span class="hl-8">// ]</span><br/><span class="hl-8">// Helloooo! first listener</span><br/><span class="hl-8">// event with parameters 1, 2 in second listener</span><br/><span class="hl-8">// event with parameters 1, 2, 3, 4, 5 in third listener</span>
fab6d3b5 192</code><button>Copy</button></pre>
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193
194<h3>Since</h3><p>v0.1.26</p>
195</div>
196<div class="tsd-parameters">
197<h4 class="tsd-parameters-title">Parameters</h4>
198<ul class="tsd-parameter-list">
199<li>
3bd6a82e 200<h5><span class="tsd-kind-parameter">eventName</span>: <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type">symbol</span></h5></li>
41015374 201<li>
3bd6a82e 202<h5><code class="tsd-tag ts-flagRest">Rest</code> <span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span>: <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span></h5></li></ul></div>
41015374 203<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">boolean</span></h4><aside class="tsd-sources">
811dc01f 204<p>Inherited from EventEmitterAsyncResource.emit</p>
41015374 205<ul>
811dc01f 206<li>Defined in node_modules/.pnpm/@types+node@20.2.5/node_modules/@types/node/events.d.ts:652</li></ul></aside></li></ul></section>
3bd6a82e 207<section class="tsd-panel tsd-member tsd-is-inherited tsd-is-external"><a id="eventNames" class="tsd-anchor"></a>
41015374 208<h3 class="tsd-anchor-link"><span>event<wbr/>Names</span><a href="#eventNames" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></h3>
3bd6a82e 209<ul class="tsd-signatures tsd-is-inherited tsd-is-external">
8d1797ad 210<li class="tsd-signature tsd-anchor-link" id="eventNames.eventNames-1"><span class="tsd-kind-call-signature">event<wbr/>Names</span><span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-symbol">(</span><span class="tsd-signature-type">string</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type">symbol</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">[]</span><a href="#eventNames.eventNames-1" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></li>
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211<li class="tsd-description">
212<div class="tsd-comment tsd-typography"><p>Returns an array listing the events for which the emitter has registered
213listeners. The values in the array are strings or <code>Symbol</code>s.</p>
2c94c3a5 214<pre><code class="language-js"><span class="hl-5">import</span><span class="hl-0"> { </span><span class="hl-3">EventEmitter</span><span class="hl-0"> } </span><span class="hl-5">from</span><span class="hl-0"> </span><span class="hl-6">&#39;node:events&#39;</span><span class="hl-0">;</span><br/><br/><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-7">myEE</span><span class="hl-0"> = </span><span class="hl-4">new</span><span class="hl-0"> </span><span class="hl-2">EventEmitter</span><span class="hl-0">();</span><br/><span class="hl-3">myEE</span><span class="hl-0">.</span><span class="hl-2">on</span><span class="hl-0">(</span><span class="hl-6">&#39;foo&#39;</span><span class="hl-0">, () </span><span class="hl-4">=&gt;</span><span class="hl-0"> {});</span><br/><span class="hl-3">myEE</span><span class="hl-0">.</span><span class="hl-2">on</span><span class="hl-0">(</span><span class="hl-6">&#39;bar&#39;</span><span class="hl-0">, () </span><span class="hl-4">=&gt;</span><span class="hl-0"> {});</span><br/><br/><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-7">sym</span><span class="hl-0"> = </span><span class="hl-2">Symbol</span><span class="hl-0">(</span><span class="hl-6">&#39;symbol&#39;</span><span class="hl-0">);</span><br/><span class="hl-3">myEE</span><span class="hl-0">.</span><span class="hl-2">on</span><span class="hl-0">(</span><span class="hl-3">sym</span><span class="hl-0">, () </span><span class="hl-4">=&gt;</span><span class="hl-0"> {});</span><br/><br/><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-3">myEE</span><span class="hl-0">.</span><span class="hl-2">eventNames</span><span class="hl-0">());</span><br/><span class="hl-8">// Prints: [ &#39;foo&#39;, &#39;bar&#39;, Symbol(symbol) ]</span>
fab6d3b5 215</code><button>Copy</button></pre>
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216
217<h3>Since</h3><p>v6.0.0</p>
218</div>
219<h4 class="tsd-returns-title">Returns <span class="tsd-signature-symbol">(</span><span class="tsd-signature-type">string</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type">symbol</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">[]</span></h4><aside class="tsd-sources">
811dc01f 220<p>Inherited from EventEmitterAsyncResource.eventNames</p>
41015374 221<ul>
811dc01f 222<li>Defined in node_modules/.pnpm/@types+node@20.2.5/node_modules/@types/node/events.d.ts:715</li></ul></aside></li></ul></section>
3bd6a82e 223<section class="tsd-panel tsd-member tsd-is-inherited tsd-is-external"><a id="getMaxListeners" class="tsd-anchor"></a>
41015374 224<h3 class="tsd-anchor-link"><span>get<wbr/>Max<wbr/>Listeners</span><a href="#getMaxListeners" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></h3>
3bd6a82e 225<ul class="tsd-signatures tsd-is-inherited tsd-is-external">
8d1797ad 226<li class="tsd-signature tsd-anchor-link" id="getMaxListeners.getMaxListeners-1"><span class="tsd-kind-call-signature">get<wbr/>Max<wbr/>Listeners</span><span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">number</span><a href="#getMaxListeners.getMaxListeners-1" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></li>
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227<li class="tsd-description">
228<div class="tsd-comment tsd-typography"><p>Returns the current max listener value for the <code>EventEmitter</code> which is either
8d1797ad 229set by <code>emitter.setMaxListeners(n)</code> or defaults to <a href="PoolEmitter.html#defaultMaxListeners" class="tsd-kind-property">defaultMaxListeners</a>.</p>
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230
231<h3>Since</h3><p>v1.0.0</p>
232</div>
233<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">number</span></h4><aside class="tsd-sources">
811dc01f 234<p>Inherited from EventEmitterAsyncResource.getMaxListeners</p>
41015374 235<ul>
811dc01f 236<li>Defined in node_modules/.pnpm/@types+node@20.2.5/node_modules/@types/node/events.d.ts:567</li></ul></aside></li></ul></section>
3bd6a82e 237<section class="tsd-panel tsd-member tsd-is-inherited tsd-is-external"><a id="listenerCount" class="tsd-anchor"></a>
41015374 238<h3 class="tsd-anchor-link"><span>listener<wbr/>Count</span><a href="#listenerCount" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></h3>
3bd6a82e 239<ul class="tsd-signatures tsd-is-inherited tsd-is-external">
65ec4e64 240<li class="tsd-signature tsd-anchor-link" id="listenerCount.listenerCount-1"><span class="tsd-kind-call-signature">listener<wbr/>Count</span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">eventName</span>, <span class="tsd-kind-parameter">listener</span><span class="tsd-signature-symbol">?</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">number</span><a href="#listenerCount.listenerCount-1" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></li>
41015374 241<li class="tsd-description">
2c94c3a5 242<div class="tsd-comment tsd-typography"><p>Returns the number of listeners listening for the event named <code>eventName</code>.
243If <code>listener</code> is provided, it will return how many times the listener is found
244in the list of the listeners of the event.</p>
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245
246<h3>Since</h3><p>v3.2.0</p>
247</div>
248<div class="tsd-parameters">
249<h4 class="tsd-parameters-title">Parameters</h4>
250<ul class="tsd-parameter-list">
251<li>
3bd6a82e 252<h5><span class="tsd-kind-parameter">eventName</span>: <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type">symbol</span></h5>
41015374 253<div class="tsd-comment tsd-typography"><p>The name of the event being listened for</p>
65ec4e64 254</div></li>
255<li>
256<h5><code class="tsd-tag ts-flagOptional">Optional</code> <span class="tsd-kind-parameter">listener</span>: <span class="tsd-signature-type ">Function</span></h5>
257<div class="tsd-comment tsd-typography"><p>The event handler function</p>
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258</div></li></ul></div>
259<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">number</span></h4><aside class="tsd-sources">
811dc01f 260<p>Inherited from EventEmitterAsyncResource.listenerCount</p>
41015374 261<ul>
811dc01f 262<li>Defined in node_modules/.pnpm/@types+node@20.2.5/node_modules/@types/node/events.d.ts:661</li></ul></aside></li></ul></section>
3bd6a82e 263<section class="tsd-panel tsd-member tsd-is-inherited tsd-is-external"><a id="listeners" class="tsd-anchor"></a>
41015374 264<h3 class="tsd-anchor-link"><span>listeners</span><a href="#listeners" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></h3>
3bd6a82e 265<ul class="tsd-signatures tsd-is-inherited tsd-is-external">
8d1797ad 266<li class="tsd-signature tsd-anchor-link" id="listeners.listeners-1"><span class="tsd-kind-call-signature">listeners</span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">eventName</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type ">Function</span><span class="tsd-signature-symbol">[]</span><a href="#listeners.listeners-1" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></li>
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267<li class="tsd-description">
268<div class="tsd-comment tsd-typography"><p>Returns a copy of the array of listeners for the event named <code>eventName</code>.</p>
2c94c3a5 269<pre><code class="language-js"><span class="hl-3">server</span><span class="hl-0">.</span><span class="hl-2">on</span><span class="hl-0">(</span><span class="hl-6">&#39;connection&#39;</span><span class="hl-0">, (</span><span class="hl-3">stream</span><span class="hl-0">) </span><span class="hl-4">=&gt;</span><span class="hl-0"> {</span><br/><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-6">&#39;someone connected!&#39;</span><span class="hl-0">);</span><br/><span class="hl-0">});</span><br/><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-3">util</span><span class="hl-0">.</span><span class="hl-2">inspect</span><span class="hl-0">(</span><span class="hl-3">server</span><span class="hl-0">.</span><span class="hl-2">listeners</span><span class="hl-0">(</span><span class="hl-6">&#39;connection&#39;</span><span class="hl-0">)));</span><br/><span class="hl-8">// Prints: [ [Function] ]</span>
fab6d3b5 270</code><button>Copy</button></pre>
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271
272<h3>Since</h3><p>v0.1.26</p>
273</div>
274<div class="tsd-parameters">
275<h4 class="tsd-parameters-title">Parameters</h4>
276<ul class="tsd-parameter-list">
277<li>
3bd6a82e 278<h5><span class="tsd-kind-parameter">eventName</span>: <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type">symbol</span></h5></li></ul></div>
279<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type ">Function</span><span class="tsd-signature-symbol">[]</span></h4><aside class="tsd-sources">
811dc01f 280<p>Inherited from EventEmitterAsyncResource.listeners</p>
41015374 281<ul>
811dc01f 282<li>Defined in node_modules/.pnpm/@types+node@20.2.5/node_modules/@types/node/events.d.ts:580</li></ul></aside></li></ul></section>
3bd6a82e 283<section class="tsd-panel tsd-member tsd-is-inherited tsd-is-external"><a id="off" class="tsd-anchor"></a>
41015374 284<h3 class="tsd-anchor-link"><span>off</span><a href="#off" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></h3>
3bd6a82e 285<ul class="tsd-signatures tsd-is-inherited tsd-is-external">
8d1797ad 286<li class="tsd-signature tsd-anchor-link" id="off.off-1"><span class="tsd-kind-call-signature">off</span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">eventName</span>, <span class="tsd-kind-parameter">listener</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><a href="PoolEmitter.html" class="tsd-signature-type tsd-kind-class">PoolEmitter</a><a href="#off.off-1" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></li>
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287<li class="tsd-description">
288<div class="tsd-comment tsd-typography"><p>Alias for <code>emitter.removeListener()</code>.</p>
289
290<h3>Since</h3><p>v10.0.0</p>
291</div>
292<div class="tsd-parameters">
293<h4 class="tsd-parameters-title">Parameters</h4>
294<ul class="tsd-parameter-list">
295<li>
3bd6a82e 296<h5><span class="tsd-kind-parameter">eventName</span>: <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type">symbol</span></h5></li>
41015374 297<li>
3bd6a82e 298<h5><span class="tsd-kind-parameter">listener</span>: <span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol"> =&gt; </span><span class="tsd-signature-type">void</span><span class="tsd-signature-symbol">)</span></h5>
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299<ul class="tsd-parameters">
300<li class="tsd-parameter-signature">
3bd6a82e 301<ul class="tsd-signatures tsd-is-external">
302<li class="tsd-signature"><span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">void</span></li>
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303<li class="tsd-description">
304<div class="tsd-parameters">
305<h4 class="tsd-parameters-title">Parameters</h4>
306<ul class="tsd-parameter-list">
307<li>
3bd6a82e 308<h5><code class="tsd-tag ts-flagRest">Rest</code> <span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span>: <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span></h5></li></ul></div>
41015374 309<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">void</span></h4></li></ul></li></ul></li></ul></div>
8d1797ad 310<h4 class="tsd-returns-title">Returns <a href="PoolEmitter.html" class="tsd-signature-type tsd-kind-class">PoolEmitter</a></h4><aside class="tsd-sources">
811dc01f 311<p>Inherited from EventEmitterAsyncResource.off</p>
41015374 312<ul>
811dc01f 313<li>Defined in node_modules/.pnpm/@types+node@20.2.5/node_modules/@types/node/events.d.ts:540</li></ul></aside></li></ul></section>
3bd6a82e 314<section class="tsd-panel tsd-member tsd-is-inherited tsd-is-external"><a id="on" class="tsd-anchor"></a>
41015374 315<h3 class="tsd-anchor-link"><span>on</span><a href="#on" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></h3>
3bd6a82e 316<ul class="tsd-signatures tsd-is-inherited tsd-is-external">
8d1797ad 317<li class="tsd-signature tsd-anchor-link" id="on.on-1"><span class="tsd-kind-call-signature">on</span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">eventName</span>, <span class="tsd-kind-parameter">listener</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><a href="PoolEmitter.html" class="tsd-signature-type tsd-kind-class">PoolEmitter</a><a href="#on.on-1" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></li>
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318<li class="tsd-description">
319<div class="tsd-comment tsd-typography"><p>Adds the <code>listener</code> function to the end of the listeners array for the
320event named <code>eventName</code>. No checks are made to see if the <code>listener</code> has
321already been added. Multiple calls passing the same combination of <code>eventName</code>and <code>listener</code> will result in the <code>listener</code> being added, and called, multiple
322times.</p>
842d8918 323<pre><code class="language-js"><span class="hl-3">server</span><span class="hl-0">.</span><span class="hl-2">on</span><span class="hl-0">(</span><span class="hl-6">&#39;connection&#39;</span><span class="hl-0">, (</span><span class="hl-3">stream</span><span class="hl-0">) </span><span class="hl-4">=&gt;</span><span class="hl-0"> {</span><br/><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-6">&#39;someone connected!&#39;</span><span class="hl-0">);</span><br/><span class="hl-0">});</span>
fab6d3b5 324</code><button>Copy</button></pre>
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325<p>Returns a reference to the <code>EventEmitter</code>, so that calls can be chained.</p>
326<p>By default, event listeners are invoked in the order they are added. The<code>emitter.prependListener()</code> method can be used as an alternative to add the
327event listener to the beginning of the listeners array.</p>
2c94c3a5 328<pre><code class="language-js"><span class="hl-5">import</span><span class="hl-0"> { </span><span class="hl-3">EventEmitter</span><span class="hl-0"> } </span><span class="hl-5">from</span><span class="hl-0"> </span><span class="hl-6">&#39;node:events&#39;</span><span class="hl-0">;</span><br/><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-7">myEE</span><span class="hl-0"> = </span><span class="hl-4">new</span><span class="hl-0"> </span><span class="hl-2">EventEmitter</span><span class="hl-0">();</span><br/><span class="hl-3">myEE</span><span class="hl-0">.</span><span class="hl-2">on</span><span class="hl-0">(</span><span class="hl-6">&#39;foo&#39;</span><span class="hl-0">, () </span><span class="hl-4">=&gt;</span><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-6">&#39;a&#39;</span><span class="hl-0">));</span><br/><span class="hl-3">myEE</span><span class="hl-0">.</span><span class="hl-2">prependListener</span><span class="hl-0">(</span><span class="hl-6">&#39;foo&#39;</span><span class="hl-0">, () </span><span class="hl-4">=&gt;</span><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-6">&#39;b&#39;</span><span class="hl-0">));</span><br/><span class="hl-3">myEE</span><span class="hl-0">.</span><span class="hl-2">emit</span><span class="hl-0">(</span><span class="hl-6">&#39;foo&#39;</span><span class="hl-0">);</span><br/><span class="hl-8">// Prints:</span><br/><span class="hl-8">// b</span><br/><span class="hl-8">// a</span>
fab6d3b5 329</code><button>Copy</button></pre>
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330
331<h3>Since</h3><p>v0.1.101</p>
332</div>
333<div class="tsd-parameters">
334<h4 class="tsd-parameters-title">Parameters</h4>
335<ul class="tsd-parameter-list">
336<li>
3bd6a82e 337<h5><span class="tsd-kind-parameter">eventName</span>: <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type">symbol</span></h5>
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338<div class="tsd-comment tsd-typography"><p>The name of the event.</p>
339</div></li>
340<li>
3bd6a82e 341<h5><span class="tsd-kind-parameter">listener</span>: <span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol"> =&gt; </span><span class="tsd-signature-type">void</span><span class="tsd-signature-symbol">)</span></h5>
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342<div class="tsd-comment tsd-typography"><p>The callback function</p>
343</div>
344<ul class="tsd-parameters">
345<li class="tsd-parameter-signature">
3bd6a82e 346<ul class="tsd-signatures tsd-is-external">
347<li class="tsd-signature"><span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">void</span></li>
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348<li class="tsd-description">
349<div class="tsd-parameters">
350<h4 class="tsd-parameters-title">Parameters</h4>
351<ul class="tsd-parameter-list">
352<li>
3bd6a82e 353<h5><code class="tsd-tag ts-flagRest">Rest</code> <span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span>: <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span></h5></li></ul></div>
41015374 354<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">void</span></h4></li></ul></li></ul></li></ul></div>
8d1797ad 355<h4 class="tsd-returns-title">Returns <a href="PoolEmitter.html" class="tsd-signature-type tsd-kind-class">PoolEmitter</a></h4><aside class="tsd-sources">
811dc01f 356<p>Inherited from EventEmitterAsyncResource.on</p>
41015374 357<ul>
811dc01f 358<li>Defined in node_modules/.pnpm/@types+node@20.2.5/node_modules/@types/node/events.d.ts:422</li></ul></aside></li></ul></section>
3bd6a82e 359<section class="tsd-panel tsd-member tsd-is-inherited tsd-is-external"><a id="once" class="tsd-anchor"></a>
41015374 360<h3 class="tsd-anchor-link"><span>once</span><a href="#once" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></h3>
3bd6a82e 361<ul class="tsd-signatures tsd-is-inherited tsd-is-external">
8d1797ad 362<li class="tsd-signature tsd-anchor-link" id="once.once-1"><span class="tsd-kind-call-signature">once</span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">eventName</span>, <span class="tsd-kind-parameter">listener</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><a href="PoolEmitter.html" class="tsd-signature-type tsd-kind-class">PoolEmitter</a><a href="#once.once-1" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></li>
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363<li class="tsd-description">
364<div class="tsd-comment tsd-typography"><p>Adds a <strong>one-time</strong><code>listener</code> function for the event named <code>eventName</code>. The
365next time <code>eventName</code> is triggered, this listener is removed and then invoked.</p>
842d8918 366<pre><code class="language-js"><span class="hl-3">server</span><span class="hl-0">.</span><span class="hl-2">once</span><span class="hl-0">(</span><span class="hl-6">&#39;connection&#39;</span><span class="hl-0">, (</span><span class="hl-3">stream</span><span class="hl-0">) </span><span class="hl-4">=&gt;</span><span class="hl-0"> {</span><br/><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-6">&#39;Ah, we have our first user!&#39;</span><span class="hl-0">);</span><br/><span class="hl-0">});</span>
fab6d3b5 367</code><button>Copy</button></pre>
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368<p>Returns a reference to the <code>EventEmitter</code>, so that calls can be chained.</p>
369<p>By default, event listeners are invoked in the order they are added. The<code>emitter.prependOnceListener()</code> method can be used as an alternative to add the
370event listener to the beginning of the listeners array.</p>
2c94c3a5 371<pre><code class="language-js"><span class="hl-5">import</span><span class="hl-0"> { </span><span class="hl-3">EventEmitter</span><span class="hl-0"> } </span><span class="hl-5">from</span><span class="hl-0"> </span><span class="hl-6">&#39;node:events&#39;</span><span class="hl-0">;</span><br/><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-7">myEE</span><span class="hl-0"> = </span><span class="hl-4">new</span><span class="hl-0"> </span><span class="hl-2">EventEmitter</span><span class="hl-0">();</span><br/><span class="hl-3">myEE</span><span class="hl-0">.</span><span class="hl-2">once</span><span class="hl-0">(</span><span class="hl-6">&#39;foo&#39;</span><span class="hl-0">, () </span><span class="hl-4">=&gt;</span><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-6">&#39;a&#39;</span><span class="hl-0">));</span><br/><span class="hl-3">myEE</span><span class="hl-0">.</span><span class="hl-2">prependOnceListener</span><span class="hl-0">(</span><span class="hl-6">&#39;foo&#39;</span><span class="hl-0">, () </span><span class="hl-4">=&gt;</span><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-6">&#39;b&#39;</span><span class="hl-0">));</span><br/><span class="hl-3">myEE</span><span class="hl-0">.</span><span class="hl-2">emit</span><span class="hl-0">(</span><span class="hl-6">&#39;foo&#39;</span><span class="hl-0">);</span><br/><span class="hl-8">// Prints:</span><br/><span class="hl-8">// b</span><br/><span class="hl-8">// a</span>
fab6d3b5 372</code><button>Copy</button></pre>
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373
374<h3>Since</h3><p>v0.3.0</p>
375</div>
376<div class="tsd-parameters">
377<h4 class="tsd-parameters-title">Parameters</h4>
378<ul class="tsd-parameter-list">
379<li>
3bd6a82e 380<h5><span class="tsd-kind-parameter">eventName</span>: <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type">symbol</span></h5>
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381<div class="tsd-comment tsd-typography"><p>The name of the event.</p>
382</div></li>
383<li>
3bd6a82e 384<h5><span class="tsd-kind-parameter">listener</span>: <span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol"> =&gt; </span><span class="tsd-signature-type">void</span><span class="tsd-signature-symbol">)</span></h5>
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385<div class="tsd-comment tsd-typography"><p>The callback function</p>
386</div>
387<ul class="tsd-parameters">
388<li class="tsd-parameter-signature">
3bd6a82e 389<ul class="tsd-signatures tsd-is-external">
390<li class="tsd-signature"><span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">void</span></li>
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391<li class="tsd-description">
392<div class="tsd-parameters">
393<h4 class="tsd-parameters-title">Parameters</h4>
394<ul class="tsd-parameter-list">
395<li>
3bd6a82e 396<h5><code class="tsd-tag ts-flagRest">Rest</code> <span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span>: <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span></h5></li></ul></div>
41015374 397<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">void</span></h4></li></ul></li></ul></li></ul></div>
8d1797ad 398<h4 class="tsd-returns-title">Returns <a href="PoolEmitter.html" class="tsd-signature-type tsd-kind-class">PoolEmitter</a></h4><aside class="tsd-sources">
811dc01f 399<p>Inherited from EventEmitterAsyncResource.once</p>
41015374 400<ul>
811dc01f 401<li>Defined in node_modules/.pnpm/@types+node@20.2.5/node_modules/@types/node/events.d.ts:452</li></ul></aside></li></ul></section>
3bd6a82e 402<section class="tsd-panel tsd-member tsd-is-inherited tsd-is-external"><a id="prependListener" class="tsd-anchor"></a>
41015374 403<h3 class="tsd-anchor-link"><span>prepend<wbr/>Listener</span><a href="#prependListener" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></h3>
3bd6a82e 404<ul class="tsd-signatures tsd-is-inherited tsd-is-external">
8d1797ad 405<li class="tsd-signature tsd-anchor-link" id="prependListener.prependListener-1"><span class="tsd-kind-call-signature">prepend<wbr/>Listener</span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">eventName</span>, <span class="tsd-kind-parameter">listener</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><a href="PoolEmitter.html" class="tsd-signature-type tsd-kind-class">PoolEmitter</a><a href="#prependListener.prependListener-1" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></li>
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406<li class="tsd-description">
407<div class="tsd-comment tsd-typography"><p>Adds the <code>listener</code> function to the <em>beginning</em> of the listeners array for the
408event named <code>eventName</code>. No checks are made to see if the <code>listener</code> has
409already been added. Multiple calls passing the same combination of <code>eventName</code>and <code>listener</code> will result in the <code>listener</code> being added, and called, multiple
410times.</p>
842d8918 411<pre><code class="language-js"><span class="hl-3">server</span><span class="hl-0">.</span><span class="hl-2">prependListener</span><span class="hl-0">(</span><span class="hl-6">&#39;connection&#39;</span><span class="hl-0">, (</span><span class="hl-3">stream</span><span class="hl-0">) </span><span class="hl-4">=&gt;</span><span class="hl-0"> {</span><br/><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-6">&#39;someone connected!&#39;</span><span class="hl-0">);</span><br/><span class="hl-0">});</span>
fab6d3b5 412</code><button>Copy</button></pre>
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413<p>Returns a reference to the <code>EventEmitter</code>, so that calls can be chained.</p>
414
415<h3>Since</h3><p>v6.0.0</p>
416</div>
417<div class="tsd-parameters">
418<h4 class="tsd-parameters-title">Parameters</h4>
419<ul class="tsd-parameter-list">
420<li>
3bd6a82e 421<h5><span class="tsd-kind-parameter">eventName</span>: <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type">symbol</span></h5>
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422<div class="tsd-comment tsd-typography"><p>The name of the event.</p>
423</div></li>
424<li>
3bd6a82e 425<h5><span class="tsd-kind-parameter">listener</span>: <span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol"> =&gt; </span><span class="tsd-signature-type">void</span><span class="tsd-signature-symbol">)</span></h5>
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426<div class="tsd-comment tsd-typography"><p>The callback function</p>
427</div>
428<ul class="tsd-parameters">
429<li class="tsd-parameter-signature">
3bd6a82e 430<ul class="tsd-signatures tsd-is-external">
431<li class="tsd-signature"><span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">void</span></li>
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432<li class="tsd-description">
433<div class="tsd-parameters">
434<h4 class="tsd-parameters-title">Parameters</h4>
435<ul class="tsd-parameter-list">
436<li>
3bd6a82e 437<h5><code class="tsd-tag ts-flagRest">Rest</code> <span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span>: <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span></h5></li></ul></div>
41015374 438<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">void</span></h4></li></ul></li></ul></li></ul></div>
8d1797ad 439<h4 class="tsd-returns-title">Returns <a href="PoolEmitter.html" class="tsd-signature-type tsd-kind-class">PoolEmitter</a></h4><aside class="tsd-sources">
811dc01f 440<p>Inherited from EventEmitterAsyncResource.prependListener</p>
41015374 441<ul>
811dc01f 442<li>Defined in node_modules/.pnpm/@types+node@20.2.5/node_modules/@types/node/events.d.ts:679</li></ul></aside></li></ul></section>
3bd6a82e 443<section class="tsd-panel tsd-member tsd-is-inherited tsd-is-external"><a id="prependOnceListener" class="tsd-anchor"></a>
41015374 444<h3 class="tsd-anchor-link"><span>prepend<wbr/>Once<wbr/>Listener</span><a href="#prependOnceListener" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></h3>
3bd6a82e 445<ul class="tsd-signatures tsd-is-inherited tsd-is-external">
8d1797ad 446<li class="tsd-signature tsd-anchor-link" id="prependOnceListener.prependOnceListener-1"><span class="tsd-kind-call-signature">prepend<wbr/>Once<wbr/>Listener</span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">eventName</span>, <span class="tsd-kind-parameter">listener</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><a href="PoolEmitter.html" class="tsd-signature-type tsd-kind-class">PoolEmitter</a><a href="#prependOnceListener.prependOnceListener-1" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></li>
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447<li class="tsd-description">
448<div class="tsd-comment tsd-typography"><p>Adds a <strong>one-time</strong><code>listener</code> function for the event named <code>eventName</code> to the <em>beginning</em> of the listeners array. The next time <code>eventName</code> is triggered, this
449listener is removed, and then invoked.</p>
842d8918 450<pre><code class="language-js"><span class="hl-3">server</span><span class="hl-0">.</span><span class="hl-2">prependOnceListener</span><span class="hl-0">(</span><span class="hl-6">&#39;connection&#39;</span><span class="hl-0">, (</span><span class="hl-3">stream</span><span class="hl-0">) </span><span class="hl-4">=&gt;</span><span class="hl-0"> {</span><br/><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-6">&#39;Ah, we have our first user!&#39;</span><span class="hl-0">);</span><br/><span class="hl-0">});</span>
fab6d3b5 451</code><button>Copy</button></pre>
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452<p>Returns a reference to the <code>EventEmitter</code>, so that calls can be chained.</p>
453
454<h3>Since</h3><p>v6.0.0</p>
455</div>
456<div class="tsd-parameters">
457<h4 class="tsd-parameters-title">Parameters</h4>
458<ul class="tsd-parameter-list">
459<li>
3bd6a82e 460<h5><span class="tsd-kind-parameter">eventName</span>: <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type">symbol</span></h5>
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461<div class="tsd-comment tsd-typography"><p>The name of the event.</p>
462</div></li>
463<li>
3bd6a82e 464<h5><span class="tsd-kind-parameter">listener</span>: <span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol"> =&gt; </span><span class="tsd-signature-type">void</span><span class="tsd-signature-symbol">)</span></h5>
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465<div class="tsd-comment tsd-typography"><p>The callback function</p>
466</div>
467<ul class="tsd-parameters">
468<li class="tsd-parameter-signature">
3bd6a82e 469<ul class="tsd-signatures tsd-is-external">
470<li class="tsd-signature"><span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">void</span></li>
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471<li class="tsd-description">
472<div class="tsd-parameters">
473<h4 class="tsd-parameters-title">Parameters</h4>
474<ul class="tsd-parameter-list">
475<li>
3bd6a82e 476<h5><code class="tsd-tag ts-flagRest">Rest</code> <span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span>: <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span></h5></li></ul></div>
41015374 477<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">void</span></h4></li></ul></li></ul></li></ul></div>
8d1797ad 478<h4 class="tsd-returns-title">Returns <a href="PoolEmitter.html" class="tsd-signature-type tsd-kind-class">PoolEmitter</a></h4><aside class="tsd-sources">
811dc01f 479<p>Inherited from EventEmitterAsyncResource.prependOnceListener</p>
41015374 480<ul>
811dc01f 481<li>Defined in node_modules/.pnpm/@types+node@20.2.5/node_modules/@types/node/events.d.ts:695</li></ul></aside></li></ul></section>
3bd6a82e 482<section class="tsd-panel tsd-member tsd-is-inherited tsd-is-external"><a id="rawListeners" class="tsd-anchor"></a>
41015374 483<h3 class="tsd-anchor-link"><span>raw<wbr/>Listeners</span><a href="#rawListeners" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></h3>
3bd6a82e 484<ul class="tsd-signatures tsd-is-inherited tsd-is-external">
8d1797ad 485<li class="tsd-signature tsd-anchor-link" id="rawListeners.rawListeners-1"><span class="tsd-kind-call-signature">raw<wbr/>Listeners</span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">eventName</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type ">Function</span><span class="tsd-signature-symbol">[]</span><a href="#rawListeners.rawListeners-1" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></li>
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486<li class="tsd-description">
487<div class="tsd-comment tsd-typography"><p>Returns a copy of the array of listeners for the event named <code>eventName</code>,
488including any wrappers (such as those created by <code>.once()</code>).</p>
2c94c3a5 489<pre><code class="language-js"><span class="hl-5">import</span><span class="hl-0"> { </span><span class="hl-3">EventEmitter</span><span class="hl-0"> } </span><span class="hl-5">from</span><span class="hl-0"> </span><span class="hl-6">&#39;node:events&#39;</span><span class="hl-0">;</span><br/><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-7">emitter</span><span class="hl-0"> = </span><span class="hl-4">new</span><span class="hl-0"> </span><span class="hl-2">EventEmitter</span><span class="hl-0">();</span><br/><span class="hl-3">emitter</span><span class="hl-0">.</span><span class="hl-2">once</span><span class="hl-0">(</span><span class="hl-6">&#39;log&#39;</span><span class="hl-0">, () </span><span class="hl-4">=&gt;</span><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-6">&#39;log once&#39;</span><span class="hl-0">));</span><br/><br/><span class="hl-8">// Returns a new Array with a function `onceWrapper` which has a property</span><br/><span class="hl-8">// `listener` which contains the original listener bound above</span><br/><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-7">listeners</span><span class="hl-0"> = </span><span class="hl-3">emitter</span><span class="hl-0">.</span><span class="hl-2">rawListeners</span><span class="hl-0">(</span><span class="hl-6">&#39;log&#39;</span><span class="hl-0">);</span><br/><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-7">logFnWrapper</span><span class="hl-0"> = </span><span class="hl-3">listeners</span><span class="hl-0">[</span><span class="hl-1">0</span><span class="hl-0">];</span><br/><br/><span class="hl-8">// Logs &quot;log once&quot; to the console and does not unbind the `once` event</span><br/><span class="hl-3">logFnWrapper</span><span class="hl-0">.</span><span class="hl-2">listener</span><span class="hl-0">();</span><br/><br/><span class="hl-8">// Logs &quot;log once&quot; to the console and removes the listener</span><br/><span class="hl-2">logFnWrapper</span><span class="hl-0">();</span><br/><br/><span class="hl-3">emitter</span><span class="hl-0">.</span><span class="hl-2">on</span><span class="hl-0">(</span><span class="hl-6">&#39;log&#39;</span><span class="hl-0">, () </span><span class="hl-4">=&gt;</span><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-6">&#39;log persistently&#39;</span><span class="hl-0">));</span><br/><span class="hl-8">// Will return a new Array with a single function bound by `.on()` above</span><br/><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-7">newListeners</span><span class="hl-0"> = </span><span class="hl-3">emitter</span><span class="hl-0">.</span><span class="hl-2">rawListeners</span><span class="hl-0">(</span><span class="hl-6">&#39;log&#39;</span><span class="hl-0">);</span><br/><br/><span class="hl-8">// Logs &quot;log persistently&quot; twice</span><br/><span class="hl-3">newListeners</span><span class="hl-0">[</span><span class="hl-1">0</span><span class="hl-0">]();</span><br/><span class="hl-3">emitter</span><span class="hl-0">.</span><span class="hl-2">emit</span><span class="hl-0">(</span><span class="hl-6">&#39;log&#39;</span><span class="hl-0">);</span>
fab6d3b5 490</code><button>Copy</button></pre>
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491
492<h3>Since</h3><p>v9.4.0</p>
493</div>
494<div class="tsd-parameters">
495<h4 class="tsd-parameters-title">Parameters</h4>
496<ul class="tsd-parameter-list">
497<li>
3bd6a82e 498<h5><span class="tsd-kind-parameter">eventName</span>: <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type">symbol</span></h5></li></ul></div>
499<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type ">Function</span><span class="tsd-signature-symbol">[]</span></h4><aside class="tsd-sources">
811dc01f 500<p>Inherited from EventEmitterAsyncResource.rawListeners</p>
41015374 501<ul>
811dc01f 502<li>Defined in node_modules/.pnpm/@types+node@20.2.5/node_modules/@types/node/events.d.ts:611</li></ul></aside></li></ul></section>
3bd6a82e 503<section class="tsd-panel tsd-member tsd-is-inherited tsd-is-external"><a id="removeAllListeners" class="tsd-anchor"></a>
41015374 504<h3 class="tsd-anchor-link"><span>remove<wbr/>All<wbr/>Listeners</span><a href="#removeAllListeners" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></h3>
3bd6a82e 505<ul class="tsd-signatures tsd-is-inherited tsd-is-external">
8d1797ad 506<li class="tsd-signature tsd-anchor-link" id="removeAllListeners.removeAllListeners-1"><span class="tsd-kind-call-signature">remove<wbr/>All<wbr/>Listeners</span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">event</span><span class="tsd-signature-symbol">?</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><a href="PoolEmitter.html" class="tsd-signature-type tsd-kind-class">PoolEmitter</a><a href="#removeAllListeners.removeAllListeners-1" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></li>
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507<li class="tsd-description">
508<div class="tsd-comment tsd-typography"><p>Removes all listeners, or those of the specified <code>eventName</code>.</p>
509<p>It is bad practice to remove listeners added elsewhere in the code,
510particularly when the <code>EventEmitter</code> instance was created by some other
511component or module (e.g. sockets or file streams).</p>
512<p>Returns a reference to the <code>EventEmitter</code>, so that calls can be chained.</p>
513
514<h3>Since</h3><p>v0.1.26</p>
515</div>
516<div class="tsd-parameters">
517<h4 class="tsd-parameters-title">Parameters</h4>
518<ul class="tsd-parameter-list">
519<li>
3bd6a82e 520<h5><code class="tsd-tag ts-flagOptional">Optional</code> <span class="tsd-kind-parameter">event</span>: <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type">symbol</span></h5></li></ul></div>
8d1797ad 521<h4 class="tsd-returns-title">Returns <a href="PoolEmitter.html" class="tsd-signature-type tsd-kind-class">PoolEmitter</a></h4><aside class="tsd-sources">
811dc01f 522<p>Inherited from EventEmitterAsyncResource.removeAllListeners</p>
41015374 523<ul>
811dc01f 524<li>Defined in node_modules/.pnpm/@types+node@20.2.5/node_modules/@types/node/events.d.ts:551</li></ul></aside></li></ul></section>
3bd6a82e 525<section class="tsd-panel tsd-member tsd-is-inherited tsd-is-external"><a id="removeListener" class="tsd-anchor"></a>
41015374 526<h3 class="tsd-anchor-link"><span>remove<wbr/>Listener</span><a href="#removeListener" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></h3>
3bd6a82e 527<ul class="tsd-signatures tsd-is-inherited tsd-is-external">
8d1797ad 528<li class="tsd-signature tsd-anchor-link" id="removeListener.removeListener-1"><span class="tsd-kind-call-signature">remove<wbr/>Listener</span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">eventName</span>, <span class="tsd-kind-parameter">listener</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><a href="PoolEmitter.html" class="tsd-signature-type tsd-kind-class">PoolEmitter</a><a href="#removeListener.removeListener-1" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></li>
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529<li class="tsd-description">
530<div class="tsd-comment tsd-typography"><p>Removes the specified <code>listener</code> from the listener array for the event named<code>eventName</code>.</p>
2c94c3a5 531<pre><code class="language-js"><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-2">callback</span><span class="hl-0"> = (</span><span class="hl-3">stream</span><span class="hl-0">) </span><span class="hl-4">=&gt;</span><span class="hl-0"> {</span><br/><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-6">&#39;someone connected!&#39;</span><span class="hl-0">);</span><br/><span class="hl-0">};</span><br/><span class="hl-3">server</span><span class="hl-0">.</span><span class="hl-2">on</span><span class="hl-0">(</span><span class="hl-6">&#39;connection&#39;</span><span class="hl-0">, </span><span class="hl-3">callback</span><span class="hl-0">);</span><br/><span class="hl-8">// ...</span><br/><span class="hl-3">server</span><span class="hl-0">.</span><span class="hl-2">removeListener</span><span class="hl-0">(</span><span class="hl-6">&#39;connection&#39;</span><span class="hl-0">, </span><span class="hl-3">callback</span><span class="hl-0">);</span>
fab6d3b5 532</code><button>Copy</button></pre>
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533<p><code>removeListener()</code> will remove, at most, one instance of a listener from the
534listener array. If any single listener has been added multiple times to the
535listener array for the specified <code>eventName</code>, then <code>removeListener()</code> must be
536called multiple times to remove each instance.</p>
537<p>Once an event is emitted, all listeners attached to it at the
538time of emitting are called in order. This implies that any<code>removeListener()</code> or <code>removeAllListeners()</code> calls <em>after</em> emitting and <em>before</em> the last listener finishes execution
539will not remove them from<code>emit()</code> in progress. Subsequent events behave as expected.</p>
2c94c3a5 540<pre><code class="language-js"><span class="hl-5">import</span><span class="hl-0"> { </span><span class="hl-3">EventEmitter</span><span class="hl-0"> } </span><span class="hl-5">from</span><span class="hl-0"> </span><span class="hl-6">&#39;node:events&#39;</span><span class="hl-0">;</span><br/><span class="hl-4">class</span><span class="hl-0"> </span><span class="hl-9">MyEmitter</span><span class="hl-0"> </span><span class="hl-4">extends</span><span class="hl-0"> </span><span class="hl-9">EventEmitter</span><span class="hl-0"> {}</span><br/><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-7">myEmitter</span><span class="hl-0"> = </span><span class="hl-4">new</span><span class="hl-0"> </span><span class="hl-2">MyEmitter</span><span class="hl-0">();</span><br/><br/><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-2">callbackA</span><span class="hl-0"> = () </span><span class="hl-4">=&gt;</span><span class="hl-0"> {</span><br/><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-6">&#39;A&#39;</span><span class="hl-0">);</span><br/><span class="hl-0"> </span><span class="hl-3">myEmitter</span><span class="hl-0">.</span><span class="hl-2">removeListener</span><span class="hl-0">(</span><span class="hl-6">&#39;event&#39;</span><span class="hl-0">, </span><span class="hl-3">callbackB</span><span class="hl-0">);</span><br/><span class="hl-0">};</span><br/><br/><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-2">callbackB</span><span class="hl-0"> = () </span><span class="hl-4">=&gt;</span><span class="hl-0"> {</span><br/><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-6">&#39;B&#39;</span><span class="hl-0">);</span><br/><span class="hl-0">};</span><br/><br/><span class="hl-3">myEmitter</span><span class="hl-0">.</span><span class="hl-2">on</span><span class="hl-0">(</span><span class="hl-6">&#39;event&#39;</span><span class="hl-0">, </span><span class="hl-3">callbackA</span><span class="hl-0">);</span><br/><br/><span class="hl-3">myEmitter</span><span class="hl-0">.</span><span class="hl-2">on</span><span class="hl-0">(</span><span class="hl-6">&#39;event&#39;</span><span class="hl-0">, </span><span class="hl-3">callbackB</span><span class="hl-0">);</span><br/><br/><span class="hl-8">// callbackA removes listener callbackB but it will still be called.</span><br/><span class="hl-8">// Internal listener array at time of emit [callbackA, callbackB]</span><br/><span class="hl-3">myEmitter</span><span class="hl-0">.</span><span class="hl-2">emit</span><span class="hl-0">(</span><span class="hl-6">&#39;event&#39;</span><span class="hl-0">);</span><br/><span class="hl-8">// Prints:</span><br/><span class="hl-8">// A</span><br/><span class="hl-8">// B</span><br/><br/><span class="hl-8">// callbackB is now removed.</span><br/><span class="hl-8">// Internal listener array [callbackA]</span><br/><span class="hl-3">myEmitter</span><span class="hl-0">.</span><span class="hl-2">emit</span><span class="hl-0">(</span><span class="hl-6">&#39;event&#39;</span><span class="hl-0">);</span><br/><span class="hl-8">// Prints:</span><br/><span class="hl-8">// A</span>
fab6d3b5 541</code><button>Copy</button></pre>
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542<p>Because listeners are managed using an internal array, calling this will
543change the position indices of any listener registered <em>after</em> the listener
544being removed. This will not impact the order in which listeners are called,
545but it means that any copies of the listener array as returned by
546the <code>emitter.listeners()</code> method will need to be recreated.</p>
547<p>When a single function has been added as a handler multiple times for a single
548event (as in the example below), <code>removeListener()</code> will remove the most
549recently added instance. In the example the <code>once(&#39;ping&#39;)</code>listener is removed:</p>
2c94c3a5 550<pre><code class="language-js"><span class="hl-5">import</span><span class="hl-0"> { </span><span class="hl-3">EventEmitter</span><span class="hl-0"> } </span><span class="hl-5">from</span><span class="hl-0"> </span><span class="hl-6">&#39;node:events&#39;</span><span class="hl-0">;</span><br/><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-7">ee</span><span class="hl-0"> = </span><span class="hl-4">new</span><span class="hl-0"> </span><span class="hl-2">EventEmitter</span><span class="hl-0">();</span><br/><br/><span class="hl-4">function</span><span class="hl-0"> </span><span class="hl-2">pong</span><span class="hl-0">() {</span><br/><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-6">&#39;pong&#39;</span><span class="hl-0">);</span><br/><span class="hl-0">}</span><br/><br/><span class="hl-3">ee</span><span class="hl-0">.</span><span class="hl-2">on</span><span class="hl-0">(</span><span class="hl-6">&#39;ping&#39;</span><span class="hl-0">, </span><span class="hl-3">pong</span><span class="hl-0">);</span><br/><span class="hl-3">ee</span><span class="hl-0">.</span><span class="hl-2">once</span><span class="hl-0">(</span><span class="hl-6">&#39;ping&#39;</span><span class="hl-0">, </span><span class="hl-3">pong</span><span class="hl-0">);</span><br/><span class="hl-3">ee</span><span class="hl-0">.</span><span class="hl-2">removeListener</span><span class="hl-0">(</span><span class="hl-6">&#39;ping&#39;</span><span class="hl-0">, </span><span class="hl-3">pong</span><span class="hl-0">);</span><br/><br/><span class="hl-3">ee</span><span class="hl-0">.</span><span class="hl-2">emit</span><span class="hl-0">(</span><span class="hl-6">&#39;ping&#39;</span><span class="hl-0">);</span><br/><span class="hl-3">ee</span><span class="hl-0">.</span><span class="hl-2">emit</span><span class="hl-0">(</span><span class="hl-6">&#39;ping&#39;</span><span class="hl-0">);</span>
fab6d3b5 551</code><button>Copy</button></pre>
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552<p>Returns a reference to the <code>EventEmitter</code>, so that calls can be chained.</p>
553
554<h3>Since</h3><p>v0.1.26</p>
555</div>
556<div class="tsd-parameters">
557<h4 class="tsd-parameters-title">Parameters</h4>
558<ul class="tsd-parameter-list">
559<li>
3bd6a82e 560<h5><span class="tsd-kind-parameter">eventName</span>: <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type">symbol</span></h5></li>
41015374 561<li>
3bd6a82e 562<h5><span class="tsd-kind-parameter">listener</span>: <span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol"> =&gt; </span><span class="tsd-signature-type">void</span><span class="tsd-signature-symbol">)</span></h5>
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563<ul class="tsd-parameters">
564<li class="tsd-parameter-signature">
3bd6a82e 565<ul class="tsd-signatures tsd-is-external">
566<li class="tsd-signature"><span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">void</span></li>
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567<li class="tsd-description">
568<div class="tsd-parameters">
569<h4 class="tsd-parameters-title">Parameters</h4>
570<ul class="tsd-parameter-list">
571<li>
3bd6a82e 572<h5><code class="tsd-tag ts-flagRest">Rest</code> <span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span>: <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span></h5></li></ul></div>
41015374 573<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">void</span></h4></li></ul></li></ul></li></ul></div>
8d1797ad 574<h4 class="tsd-returns-title">Returns <a href="PoolEmitter.html" class="tsd-signature-type tsd-kind-class">PoolEmitter</a></h4><aside class="tsd-sources">
811dc01f 575<p>Inherited from EventEmitterAsyncResource.removeListener</p>
41015374 576<ul>
811dc01f 577<li>Defined in node_modules/.pnpm/@types+node@20.2.5/node_modules/@types/node/events.d.ts:535</li></ul></aside></li></ul></section>
3bd6a82e 578<section class="tsd-panel tsd-member tsd-is-inherited tsd-is-external"><a id="setMaxListeners" class="tsd-anchor"></a>
41015374 579<h3 class="tsd-anchor-link"><span>set<wbr/>Max<wbr/>Listeners</span><a href="#setMaxListeners" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></h3>
3bd6a82e 580<ul class="tsd-signatures tsd-is-inherited tsd-is-external">
8d1797ad 581<li class="tsd-signature tsd-anchor-link" id="setMaxListeners.setMaxListeners-1"><span class="tsd-kind-call-signature">set<wbr/>Max<wbr/>Listeners</span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">n</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><a href="PoolEmitter.html" class="tsd-signature-type tsd-kind-class">PoolEmitter</a><a href="#setMaxListeners.setMaxListeners-1" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></li>
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582<li class="tsd-description">
583<div class="tsd-comment tsd-typography"><p>By default <code>EventEmitter</code>s will print a warning if more than <code>10</code> listeners are
584added for a particular event. This is a useful default that helps finding
585memory leaks. The <code>emitter.setMaxListeners()</code> method allows the limit to be
586modified for this specific <code>EventEmitter</code> instance. The value can be set to<code>Infinity</code> (or <code>0</code>) to indicate an unlimited number of listeners.</p>
587<p>Returns a reference to the <code>EventEmitter</code>, so that calls can be chained.</p>
588
589<h3>Since</h3><p>v0.3.5</p>
590</div>
591<div class="tsd-parameters">
592<h4 class="tsd-parameters-title">Parameters</h4>
593<ul class="tsd-parameter-list">
594<li>
3bd6a82e 595<h5><span class="tsd-kind-parameter">n</span>: <span class="tsd-signature-type">number</span></h5></li></ul></div>
8d1797ad 596<h4 class="tsd-returns-title">Returns <a href="PoolEmitter.html" class="tsd-signature-type tsd-kind-class">PoolEmitter</a></h4><aside class="tsd-sources">
811dc01f 597<p>Inherited from EventEmitterAsyncResource.setMaxListeners</p>
41015374 598<ul>
811dc01f 599<li>Defined in node_modules/.pnpm/@types+node@20.2.5/node_modules/@types/node/events.d.ts:561</li></ul></aside></li></ul></section>
3bd6a82e 600<section class="tsd-panel tsd-member tsd-is-inherited tsd-is-external"><a id="getEventListeners" class="tsd-anchor"></a>
41015374 601<h3 class="tsd-anchor-link"><code class="tsd-tag ts-flagStatic">Static</code> <span>get<wbr/>Event<wbr/>Listeners</span><a href="#getEventListeners" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></h3>
3bd6a82e 602<ul class="tsd-signatures tsd-is-inherited tsd-is-external">
8d1797ad 603<li class="tsd-signature tsd-anchor-link" id="getEventListeners.getEventListeners-1"><span class="tsd-kind-call-signature">get<wbr/>Event<wbr/>Listeners</span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">emitter</span>, <span class="tsd-kind-parameter">name</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type ">Function</span><span class="tsd-signature-symbol">[]</span><a href="#getEventListeners.getEventListeners-1" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></li>
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604<li class="tsd-description">
605<div class="tsd-comment tsd-typography"><p>Returns a copy of the array of listeners for the event named <code>eventName</code>.</p>
606<p>For <code>EventEmitter</code>s this behaves exactly the same as calling <code>.listeners</code> on
607the emitter.</p>
608<p>For <code>EventTarget</code>s this is the only way to get the event listeners for the
609event target. This is useful for debugging and diagnostic purposes.</p>
2c94c3a5 610<pre><code class="language-js"><span class="hl-5">import</span><span class="hl-0"> { </span><span class="hl-3">getEventListeners</span><span class="hl-0">, </span><span class="hl-3">EventEmitter</span><span class="hl-0"> } </span><span class="hl-5">from</span><span class="hl-0"> </span><span class="hl-6">&#39;node:events&#39;</span><span class="hl-0">;</span><br/><br/><span class="hl-0">{</span><br/><span class="hl-0"> </span><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-7">ee</span><span class="hl-0"> = </span><span class="hl-4">new</span><span class="hl-0"> </span><span class="hl-2">EventEmitter</span><span class="hl-0">();</span><br/><span class="hl-0"> </span><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-2">listener</span><span class="hl-0"> = () </span><span class="hl-4">=&gt;</span><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-6">&#39;Events are fun&#39;</span><span class="hl-0">);</span><br/><span class="hl-0"> </span><span class="hl-3">ee</span><span class="hl-0">.</span><span class="hl-2">on</span><span class="hl-0">(</span><span class="hl-6">&#39;foo&#39;</span><span class="hl-0">, </span><span class="hl-3">listener</span><span class="hl-0">);</span><br/><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-2">getEventListeners</span><span class="hl-0">(</span><span class="hl-3">ee</span><span class="hl-0">, </span><span class="hl-6">&#39;foo&#39;</span><span class="hl-0">)); </span><span class="hl-8">// [ [Function: listener] ]</span><br/><span class="hl-0">}</span><br/><span class="hl-0">{</span><br/><span class="hl-0"> </span><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-7">et</span><span class="hl-0"> = </span><span class="hl-4">new</span><span class="hl-0"> </span><span class="hl-2">EventTarget</span><span class="hl-0">();</span><br/><span class="hl-0"> </span><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-2">listener</span><span class="hl-0"> = () </span><span class="hl-4">=&gt;</span><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-6">&#39;Events are fun&#39;</span><span class="hl-0">);</span><br/><span class="hl-0"> </span><span class="hl-3">et</span><span class="hl-0">.</span><span class="hl-2">addEventListener</span><span class="hl-0">(</span><span class="hl-6">&#39;foo&#39;</span><span class="hl-0">, </span><span class="hl-3">listener</span><span class="hl-0">);</span><br/><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-2">getEventListeners</span><span class="hl-0">(</span><span class="hl-3">et</span><span class="hl-0">, </span><span class="hl-6">&#39;foo&#39;</span><span class="hl-0">)); </span><span class="hl-8">// [ [Function: listener] ]</span><br/><span class="hl-0">}</span>
fab6d3b5 611</code><button>Copy</button></pre>
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612
613<h3>Since</h3><p>v15.2.0, v14.17.0</p>
614</div>
615<div class="tsd-parameters">
616<h4 class="tsd-parameters-title">Parameters</h4>
617<ul class="tsd-parameter-list">
618<li>
3bd6a82e 619<h5><span class="tsd-kind-parameter">emitter</span>: <span class="tsd-signature-type ">EventEmitter</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type ">_DOMEventTarget</span></h5></li>
41015374 620<li>
3bd6a82e 621<h5><span class="tsd-kind-parameter">name</span>: <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type">symbol</span></h5></li></ul></div>
622<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type ">Function</span><span class="tsd-signature-symbol">[]</span></h4><aside class="tsd-sources">
811dc01f 623<p>Inherited from EventEmitterAsyncResource.getEventListeners</p>
41015374 624<ul>
811dc01f 625<li>Defined in node_modules/.pnpm/@types+node@20.2.5/node_modules/@types/node/events.d.ts:296</li></ul></aside></li></ul></section>
3bd6a82e 626<section class="tsd-panel tsd-member tsd-is-inherited tsd-is-external"><a id="listenerCount-2" class="tsd-anchor"></a>
41015374 627<h3 class="tsd-anchor-link"><code class="tsd-tag ts-flagStatic">Static</code> <span>listener<wbr/>Count</span><a href="#listenerCount-2" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></h3>
3bd6a82e 628<ul class="tsd-signatures tsd-is-inherited tsd-is-external">
8d1797ad 629<li class="tsd-signature tsd-anchor-link" id="listenerCount-2.listenerCount-3"><span class="tsd-kind-call-signature">listener<wbr/>Count</span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">emitter</span>, <span class="tsd-kind-parameter">eventName</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">number</span><a href="#listenerCount-2.listenerCount-3" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></li>
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630<li class="tsd-description">
631<div class="tsd-comment tsd-typography"><p>A class method that returns the number of listeners for the given <code>eventName</code>registered on the given <code>emitter</code>.</p>
2c94c3a5 632<pre><code class="language-js"><span class="hl-5">import</span><span class="hl-0"> { </span><span class="hl-3">EventEmitter</span><span class="hl-0">, </span><span class="hl-3">listenerCount</span><span class="hl-0"> } </span><span class="hl-5">from</span><span class="hl-0"> </span><span class="hl-6">&#39;node:events&#39;</span><span class="hl-0">;</span><br/><br/><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-7">myEmitter</span><span class="hl-0"> = </span><span class="hl-4">new</span><span class="hl-0"> </span><span class="hl-2">EventEmitter</span><span class="hl-0">();</span><br/><span class="hl-3">myEmitter</span><span class="hl-0">.</span><span class="hl-2">on</span><span class="hl-0">(</span><span class="hl-6">&#39;event&#39;</span><span class="hl-0">, () </span><span class="hl-4">=&gt;</span><span class="hl-0"> {});</span><br/><span class="hl-3">myEmitter</span><span class="hl-0">.</span><span class="hl-2">on</span><span class="hl-0">(</span><span class="hl-6">&#39;event&#39;</span><span class="hl-0">, () </span><span class="hl-4">=&gt;</span><span class="hl-0"> {});</span><br/><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-2">listenerCount</span><span class="hl-0">(</span><span class="hl-3">myEmitter</span><span class="hl-0">, </span><span class="hl-6">&#39;event&#39;</span><span class="hl-0">));</span><br/><span class="hl-8">// Prints: 2</span>
fab6d3b5 633</code><button>Copy</button></pre>
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634
635<h3>Since</h3><p>v0.9.12</p>
636
637<h3>Deprecated</h3><p>Since v3.2.0 - Use <code>listenerCount</code> instead.</p>
638</div>
639<div class="tsd-parameters">
640<h4 class="tsd-parameters-title">Parameters</h4>
641<ul class="tsd-parameter-list">
642<li>
3bd6a82e 643<h5><span class="tsd-kind-parameter">emitter</span>: <span class="tsd-signature-type ">EventEmitter</span></h5>
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644<div class="tsd-comment tsd-typography"><p>The emitter to query</p>
645</div></li>
646<li>
3bd6a82e 647<h5><span class="tsd-kind-parameter">eventName</span>: <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type">symbol</span></h5>
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648<div class="tsd-comment tsd-typography"><p>The event name</p>
649</div></li></ul></div>
650<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">number</span></h4><aside class="tsd-sources">
811dc01f 651<p>Inherited from EventEmitterAsyncResource.listenerCount</p>
41015374 652<ul>
811dc01f 653<li>Defined in node_modules/.pnpm/@types+node@20.2.5/node_modules/@types/node/events.d.ts:268</li></ul></aside></li></ul></section>
3bd6a82e 654<section class="tsd-panel tsd-member tsd-is-inherited tsd-is-external"><a id="on-2" class="tsd-anchor"></a>
41015374 655<h3 class="tsd-anchor-link"><code class="tsd-tag ts-flagStatic">Static</code> <span>on</span><a href="#on-2" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></h3>
3bd6a82e 656<ul class="tsd-signatures tsd-is-inherited tsd-is-external">
8d1797ad 657<li class="tsd-signature tsd-anchor-link" id="on-2.on-3"><span class="tsd-kind-call-signature">on</span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">emitter</span>, <span class="tsd-kind-parameter">eventName</span>, <span class="tsd-kind-parameter">options</span><span class="tsd-signature-symbol">?</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type ">AsyncIterableIterator</span><span class="tsd-signature-symbol">&lt;</span><span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">&gt;</span><a href="#on-2.on-3" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></li>
41015374 658<li class="tsd-description">
2c94c3a5 659<div class="tsd-comment tsd-typography"><pre><code class="language-js"><span class="hl-5">import</span><span class="hl-0"> { </span><span class="hl-3">on</span><span class="hl-0">, </span><span class="hl-3">EventEmitter</span><span class="hl-0"> } </span><span class="hl-5">from</span><span class="hl-0"> </span><span class="hl-6">&#39;node:events&#39;</span><span class="hl-0">;</span><br/><span class="hl-5">import</span><span class="hl-0"> </span><span class="hl-3">process</span><span class="hl-0"> </span><span class="hl-5">from</span><span class="hl-0"> </span><span class="hl-6">&#39;node:process&#39;</span><span class="hl-0">;</span><br/><br/><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-7">ee</span><span class="hl-0"> = </span><span class="hl-4">new</span><span class="hl-0"> </span><span class="hl-2">EventEmitter</span><span class="hl-0">();</span><br/><br/><span class="hl-8">// Emit later on</span><br/><span class="hl-3">process</span><span class="hl-0">.</span><span class="hl-2">nextTick</span><span class="hl-0">(() </span><span class="hl-4">=&gt;</span><span class="hl-0"> {</span><br/><span class="hl-0"> </span><span class="hl-3">ee</span><span class="hl-0">.</span><span class="hl-2">emit</span><span class="hl-0">(</span><span class="hl-6">&#39;foo&#39;</span><span class="hl-0">, </span><span class="hl-6">&#39;bar&#39;</span><span class="hl-0">);</span><br/><span class="hl-0"> </span><span class="hl-3">ee</span><span class="hl-0">.</span><span class="hl-2">emit</span><span class="hl-0">(</span><span class="hl-6">&#39;foo&#39;</span><span class="hl-0">, </span><span class="hl-1">42</span><span class="hl-0">);</span><br/><span class="hl-0">});</span><br/><br/><span class="hl-5">for</span><span class="hl-0"> </span><span class="hl-5">await</span><span class="hl-0"> (</span><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-7">event</span><span class="hl-0"> </span><span class="hl-4">of</span><span class="hl-0"> </span><span class="hl-2">on</span><span class="hl-0">(</span><span class="hl-3">ee</span><span class="hl-0">, </span><span class="hl-6">&#39;foo&#39;</span><span class="hl-0">)) {</span><br/><span class="hl-0"> </span><span class="hl-8">// The execution of this inner block is synchronous and it</span><br/><span class="hl-0"> </span><span class="hl-8">// processes one event at a time (even with await). Do not use</span><br/><span class="hl-0"> </span><span class="hl-8">// if concurrent execution is required.</span><br/><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-3">event</span><span class="hl-0">); </span><span class="hl-8">// prints [&#39;bar&#39;] [42]</span><br/><span class="hl-0">}</span><br/><span class="hl-8">// Unreachable here</span>
fab6d3b5 660</code><button>Copy</button></pre>
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661<p>Returns an <code>AsyncIterator</code> that iterates <code>eventName</code> events. It will throw
662if the <code>EventEmitter</code> emits <code>&#39;error&#39;</code>. It removes all listeners when
663exiting the loop. The <code>value</code> returned by each iteration is an array
664composed of the emitted event arguments.</p>
665<p>An <code>AbortSignal</code> can be used to cancel waiting on events:</p>
2c94c3a5 666<pre><code class="language-js"><span class="hl-5">import</span><span class="hl-0"> { </span><span class="hl-3">on</span><span class="hl-0">, </span><span class="hl-3">EventEmitter</span><span class="hl-0"> } </span><span class="hl-5">from</span><span class="hl-0"> </span><span class="hl-6">&#39;node:events&#39;</span><span class="hl-0">;</span><br/><span class="hl-5">import</span><span class="hl-0"> </span><span class="hl-3">process</span><span class="hl-0"> </span><span class="hl-5">from</span><span class="hl-0"> </span><span class="hl-6">&#39;node:process&#39;</span><span class="hl-0">;</span><br/><br/><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-7">ac</span><span class="hl-0"> = </span><span class="hl-4">new</span><span class="hl-0"> </span><span class="hl-2">AbortController</span><span class="hl-0">();</span><br/><br/><span class="hl-0">(</span><span class="hl-4">async</span><span class="hl-0"> () </span><span class="hl-4">=&gt;</span><span class="hl-0"> {</span><br/><span class="hl-0"> </span><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-7">ee</span><span class="hl-0"> = </span><span class="hl-4">new</span><span class="hl-0"> </span><span class="hl-2">EventEmitter</span><span class="hl-0">();</span><br/><br/><span class="hl-0"> </span><span class="hl-8">// Emit later on</span><br/><span class="hl-0"> </span><span class="hl-3">process</span><span class="hl-0">.</span><span class="hl-2">nextTick</span><span class="hl-0">(() </span><span class="hl-4">=&gt;</span><span class="hl-0"> {</span><br/><span class="hl-0"> </span><span class="hl-3">ee</span><span class="hl-0">.</span><span class="hl-2">emit</span><span class="hl-0">(</span><span class="hl-6">&#39;foo&#39;</span><span class="hl-0">, </span><span class="hl-6">&#39;bar&#39;</span><span class="hl-0">);</span><br/><span class="hl-0"> </span><span class="hl-3">ee</span><span class="hl-0">.</span><span class="hl-2">emit</span><span class="hl-0">(</span><span class="hl-6">&#39;foo&#39;</span><span class="hl-0">, </span><span class="hl-1">42</span><span class="hl-0">);</span><br/><span class="hl-0"> });</span><br/><br/><span class="hl-0"> </span><span class="hl-5">for</span><span class="hl-0"> </span><span class="hl-5">await</span><span class="hl-0"> (</span><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-7">event</span><span class="hl-0"> </span><span class="hl-4">of</span><span class="hl-0"> </span><span class="hl-2">on</span><span class="hl-0">(</span><span class="hl-3">ee</span><span class="hl-0">, </span><span class="hl-6">&#39;foo&#39;</span><span class="hl-0">, { </span><span class="hl-3">signal:</span><span class="hl-0"> </span><span class="hl-3">ac</span><span class="hl-0">.</span><span class="hl-3">signal</span><span class="hl-0"> })) {</span><br/><span class="hl-0"> </span><span class="hl-8">// The execution of this inner block is synchronous and it</span><br/><span class="hl-0"> </span><span class="hl-8">// processes one event at a time (even with await). Do not use</span><br/><span class="hl-0"> </span><span class="hl-8">// if concurrent execution is required.</span><br/><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-3">event</span><span class="hl-0">); </span><span class="hl-8">// prints [&#39;bar&#39;] [42]</span><br/><span class="hl-0"> }</span><br/><span class="hl-0"> </span><span class="hl-8">// Unreachable here</span><br/><span class="hl-0">})();</span><br/><br/><span class="hl-3">process</span><span class="hl-0">.</span><span class="hl-2">nextTick</span><span class="hl-0">(() </span><span class="hl-4">=&gt;</span><span class="hl-0"> </span><span class="hl-3">ac</span><span class="hl-0">.</span><span class="hl-2">abort</span><span class="hl-0">());</span>
fab6d3b5 667</code><button>Copy</button></pre>
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668
669<h3>Since</h3><p>v13.6.0, v12.16.0</p>
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670</div>
671<div class="tsd-parameters">
672<h4 class="tsd-parameters-title">Parameters</h4>
673<ul class="tsd-parameter-list">
674<li>
3bd6a82e 675<h5><span class="tsd-kind-parameter">emitter</span>: <span class="tsd-signature-type ">EventEmitter</span></h5></li>
41015374 676<li>
3bd6a82e 677<h5><span class="tsd-kind-parameter">eventName</span>: <span class="tsd-signature-type">string</span></h5>
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678<div class="tsd-comment tsd-typography"><p>The name of the event being listened for</p>
679</div></li>
680<li>
3bd6a82e 681<h5><code class="tsd-tag ts-flagOptional">Optional</code> <span class="tsd-kind-parameter">options</span>: <span class="tsd-signature-type ">StaticEventEmitterOptions</span></h5></li></ul></div>
fab6d3b5 682<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type ">AsyncIterableIterator</span><span class="tsd-signature-symbol">&lt;</span><span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">&gt;</span></h4><p>that iterates <code>eventName</code> events emitted by the <code>emitter</code></p>
683<aside class="tsd-sources">
811dc01f 684<p>Inherited from EventEmitterAsyncResource.on</p>
41015374 685<ul>
811dc01f 686<li>Defined in node_modules/.pnpm/@types+node@20.2.5/node_modules/@types/node/events.d.ts:250</li></ul></aside></li></ul></section>
3bd6a82e 687<section class="tsd-panel tsd-member tsd-is-inherited tsd-is-external"><a id="once-2" class="tsd-anchor"></a>
41015374 688<h3 class="tsd-anchor-link"><code class="tsd-tag ts-flagStatic">Static</code> <span>once</span><a href="#once-2" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></h3>
3bd6a82e 689<ul class="tsd-signatures tsd-is-inherited tsd-is-external">
8d1797ad 690<li class="tsd-signature tsd-anchor-link" id="once-2.once-3"><span class="tsd-kind-call-signature">once</span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">emitter</span>, <span class="tsd-kind-parameter">eventName</span>, <span class="tsd-kind-parameter">options</span><span class="tsd-signature-symbol">?</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type ">Promise</span><span class="tsd-signature-symbol">&lt;</span><span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span><span class="tsd-signature-symbol">&gt;</span><a href="#once-2.once-3" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></li>
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691<li class="tsd-description">
692<div class="tsd-comment tsd-typography"><p>Creates a <code>Promise</code> that is fulfilled when the <code>EventEmitter</code> emits the given
693event or that is rejected if the <code>EventEmitter</code> emits <code>&#39;error&#39;</code> while waiting.
694The <code>Promise</code> will resolve with an array of all the arguments emitted to the
695given event.</p>
696<p>This method is intentionally generic and works with the web platform <a href="https://dom.spec.whatwg.org/#interface-eventtarget">EventTarget</a> interface, which has no special<code>&#39;error&#39;</code> event
697semantics and does not listen to the <code>&#39;error&#39;</code> event.</p>
2c94c3a5 698<pre><code class="language-js"><span class="hl-5">import</span><span class="hl-0"> { </span><span class="hl-3">once</span><span class="hl-0">, </span><span class="hl-3">EventEmitter</span><span class="hl-0"> } </span><span class="hl-5">from</span><span class="hl-0"> </span><span class="hl-6">&#39;node:events&#39;</span><span class="hl-0">;</span><br/><span class="hl-5">import</span><span class="hl-0"> </span><span class="hl-3">process</span><span class="hl-0"> </span><span class="hl-5">from</span><span class="hl-0"> </span><span class="hl-6">&#39;node:process&#39;</span><span class="hl-0">;</span><br/><br/><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-7">ee</span><span class="hl-0"> = </span><span class="hl-4">new</span><span class="hl-0"> </span><span class="hl-2">EventEmitter</span><span class="hl-0">();</span><br/><br/><span class="hl-3">process</span><span class="hl-0">.</span><span class="hl-2">nextTick</span><span class="hl-0">(() </span><span class="hl-4">=&gt;</span><span class="hl-0"> {</span><br/><span class="hl-0"> </span><span class="hl-3">ee</span><span class="hl-0">.</span><span class="hl-2">emit</span><span class="hl-0">(</span><span class="hl-6">&#39;myevent&#39;</span><span class="hl-0">, </span><span class="hl-1">42</span><span class="hl-0">);</span><br/><span class="hl-0">});</span><br/><br/><span class="hl-4">const</span><span class="hl-0"> [</span><span class="hl-7">value</span><span class="hl-0">] = </span><span class="hl-5">await</span><span class="hl-0"> </span><span class="hl-2">once</span><span class="hl-0">(</span><span class="hl-3">ee</span><span class="hl-0">, </span><span class="hl-6">&#39;myevent&#39;</span><span class="hl-0">);</span><br/><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-3">value</span><span class="hl-0">);</span><br/><br/><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-7">err</span><span class="hl-0"> = </span><span class="hl-4">new</span><span class="hl-0"> </span><span class="hl-2">Error</span><span class="hl-0">(</span><span class="hl-6">&#39;kaboom&#39;</span><span class="hl-0">);</span><br/><span class="hl-3">process</span><span class="hl-0">.</span><span class="hl-2">nextTick</span><span class="hl-0">(() </span><span class="hl-4">=&gt;</span><span class="hl-0"> {</span><br/><span class="hl-0"> </span><span class="hl-3">ee</span><span class="hl-0">.</span><span class="hl-2">emit</span><span class="hl-0">(</span><span class="hl-6">&#39;error&#39;</span><span class="hl-0">, </span><span class="hl-3">err</span><span class="hl-0">);</span><br/><span class="hl-0">});</span><br/><br/><span class="hl-5">try</span><span class="hl-0"> {</span><br/><span class="hl-0"> </span><span class="hl-5">await</span><span class="hl-0"> </span><span class="hl-2">once</span><span class="hl-0">(</span><span class="hl-3">ee</span><span class="hl-0">, </span><span class="hl-6">&#39;myevent&#39;</span><span class="hl-0">);</span><br/><span class="hl-0">} </span><span class="hl-5">catch</span><span class="hl-0"> (</span><span class="hl-3">err</span><span class="hl-0">) {</span><br/><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">error</span><span class="hl-0">(</span><span class="hl-6">&#39;error happened&#39;</span><span class="hl-0">, </span><span class="hl-3">err</span><span class="hl-0">);</span><br/><span class="hl-0">}</span>
fab6d3b5 699</code><button>Copy</button></pre>
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700<p>The special handling of the <code>&#39;error&#39;</code> event is only used when <code>events.once()</code>is used to wait for another event. If <code>events.once()</code> is used to wait for the
701&#39;<code>error&#39;</code> event itself, then it is treated as any other kind of event without
702special handling:</p>
2c94c3a5 703<pre><code class="language-js"><span class="hl-5">import</span><span class="hl-0"> { </span><span class="hl-3">EventEmitter</span><span class="hl-0">, </span><span class="hl-3">once</span><span class="hl-0"> } </span><span class="hl-5">from</span><span class="hl-0"> </span><span class="hl-6">&#39;node:events&#39;</span><span class="hl-0">;</span><br/><br/><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-7">ee</span><span class="hl-0"> = </span><span class="hl-4">new</span><span class="hl-0"> </span><span class="hl-2">EventEmitter</span><span class="hl-0">();</span><br/><br/><span class="hl-2">once</span><span class="hl-0">(</span><span class="hl-3">ee</span><span class="hl-0">, </span><span class="hl-6">&#39;error&#39;</span><span class="hl-0">)</span><br/><span class="hl-0"> .</span><span class="hl-2">then</span><span class="hl-0">(([</span><span class="hl-3">err</span><span class="hl-0">]) </span><span class="hl-4">=&gt;</span><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-6">&#39;ok&#39;</span><span class="hl-0">, </span><span class="hl-3">err</span><span class="hl-0">.</span><span class="hl-3">message</span><span class="hl-0">))</span><br/><span class="hl-0"> .</span><span class="hl-2">catch</span><span class="hl-0">((</span><span class="hl-3">err</span><span class="hl-0">) </span><span class="hl-4">=&gt;</span><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">error</span><span class="hl-0">(</span><span class="hl-6">&#39;error&#39;</span><span class="hl-0">, </span><span class="hl-3">err</span><span class="hl-0">.</span><span class="hl-3">message</span><span class="hl-0">));</span><br/><br/><span class="hl-3">ee</span><span class="hl-0">.</span><span class="hl-2">emit</span><span class="hl-0">(</span><span class="hl-6">&#39;error&#39;</span><span class="hl-0">, </span><span class="hl-4">new</span><span class="hl-0"> </span><span class="hl-2">Error</span><span class="hl-0">(</span><span class="hl-6">&#39;boom&#39;</span><span class="hl-0">));</span><br/><br/><span class="hl-8">// Prints: ok boom</span>
fab6d3b5 704</code><button>Copy</button></pre>
41015374 705<p>An <code>AbortSignal</code> can be used to cancel waiting for the event:</p>
2c94c3a5 706<pre><code class="language-js"><span class="hl-5">import</span><span class="hl-0"> { </span><span class="hl-3">EventEmitter</span><span class="hl-0">, </span><span class="hl-3">once</span><span class="hl-0"> } </span><span class="hl-5">from</span><span class="hl-0"> </span><span class="hl-6">&#39;node:events&#39;</span><span class="hl-0">;</span><br/><br/><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-7">ee</span><span class="hl-0"> = </span><span class="hl-4">new</span><span class="hl-0"> </span><span class="hl-2">EventEmitter</span><span class="hl-0">();</span><br/><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-7">ac</span><span class="hl-0"> = </span><span class="hl-4">new</span><span class="hl-0"> </span><span class="hl-2">AbortController</span><span class="hl-0">();</span><br/><br/><span class="hl-4">async</span><span class="hl-0"> </span><span class="hl-4">function</span><span class="hl-0"> </span><span class="hl-2">foo</span><span class="hl-0">(</span><span class="hl-3">emitter</span><span class="hl-0">, </span><span class="hl-3">event</span><span class="hl-0">, </span><span class="hl-3">signal</span><span class="hl-0">) {</span><br/><span class="hl-0"> </span><span class="hl-5">try</span><span class="hl-0"> {</span><br/><span class="hl-0"> </span><span class="hl-5">await</span><span class="hl-0"> </span><span class="hl-2">once</span><span class="hl-0">(</span><span class="hl-3">emitter</span><span class="hl-0">, </span><span class="hl-3">event</span><span class="hl-0">, { </span><span class="hl-3">signal</span><span class="hl-0"> });</span><br/><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">log</span><span class="hl-0">(</span><span class="hl-6">&#39;event emitted!&#39;</span><span class="hl-0">);</span><br/><span class="hl-0"> } </span><span class="hl-5">catch</span><span class="hl-0"> (</span><span class="hl-3">error</span><span class="hl-0">) {</span><br/><span class="hl-0"> </span><span class="hl-5">if</span><span class="hl-0"> (</span><span class="hl-3">error</span><span class="hl-0">.</span><span class="hl-3">name</span><span class="hl-0"> === </span><span class="hl-6">&#39;AbortError&#39;</span><span class="hl-0">) {</span><br/><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">error</span><span class="hl-0">(</span><span class="hl-6">&#39;Waiting for the event was canceled!&#39;</span><span class="hl-0">);</span><br/><span class="hl-0"> } </span><span class="hl-5">else</span><span class="hl-0"> {</span><br/><span class="hl-0"> </span><span class="hl-3">console</span><span class="hl-0">.</span><span class="hl-2">error</span><span class="hl-0">(</span><span class="hl-6">&#39;There was an error&#39;</span><span class="hl-0">, </span><span class="hl-3">error</span><span class="hl-0">.</span><span class="hl-3">message</span><span class="hl-0">);</span><br/><span class="hl-0"> }</span><br/><span class="hl-0"> }</span><br/><span class="hl-0">}</span><br/><br/><span class="hl-2">foo</span><span class="hl-0">(</span><span class="hl-3">ee</span><span class="hl-0">, </span><span class="hl-6">&#39;foo&#39;</span><span class="hl-0">, </span><span class="hl-3">ac</span><span class="hl-0">.</span><span class="hl-3">signal</span><span class="hl-0">);</span><br/><span class="hl-3">ac</span><span class="hl-0">.</span><span class="hl-2">abort</span><span class="hl-0">(); </span><span class="hl-8">// Abort waiting for the event</span><br/><span class="hl-3">ee</span><span class="hl-0">.</span><span class="hl-2">emit</span><span class="hl-0">(</span><span class="hl-6">&#39;foo&#39;</span><span class="hl-0">); </span><span class="hl-8">// Prints: Waiting for the event was canceled!</span>
fab6d3b5 707</code><button>Copy</button></pre>
41015374
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708
709<h3>Since</h3><p>v11.13.0, v10.16.0</p>
710</div>
711<div class="tsd-parameters">
712<h4 class="tsd-parameters-title">Parameters</h4>
713<ul class="tsd-parameter-list">
714<li>
3bd6a82e 715<h5><span class="tsd-kind-parameter">emitter</span>: <span class="tsd-signature-type ">_NodeEventTarget</span></h5></li>
41015374 716<li>
3bd6a82e 717<h5><span class="tsd-kind-parameter">eventName</span>: <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type">symbol</span></h5></li>
41015374 718<li>
3bd6a82e 719<h5><code class="tsd-tag ts-flagOptional">Optional</code> <span class="tsd-kind-parameter">options</span>: <span class="tsd-signature-type ">StaticEventEmitterOptions</span></h5></li></ul></div>
720<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type ">Promise</span><span class="tsd-signature-symbol">&lt;</span><span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span><span class="tsd-signature-symbol">&gt;</span></h4><aside class="tsd-sources">
811dc01f 721<p>Inherited from EventEmitterAsyncResource.once</p>
41015374 722<ul>
811dc01f 723<li>Defined in node_modules/.pnpm/@types+node@20.2.5/node_modules/@types/node/events.d.ts:189</li></ul></aside></li>
8d1797ad 724<li class="tsd-signature tsd-anchor-link" id="once-2.once-4"><span class="tsd-kind-call-signature">once</span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">emitter</span>, <span class="tsd-kind-parameter">eventName</span>, <span class="tsd-kind-parameter">options</span><span class="tsd-signature-symbol">?</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type ">Promise</span><span class="tsd-signature-symbol">&lt;</span><span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span><span class="tsd-signature-symbol">&gt;</span><a href="#once-2.once-4" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></li>
41015374
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725<li class="tsd-description">
726<div class="tsd-parameters">
727<h4 class="tsd-parameters-title">Parameters</h4>
728<ul class="tsd-parameter-list">
729<li>
3bd6a82e 730<h5><span class="tsd-kind-parameter">emitter</span>: <span class="tsd-signature-type ">_DOMEventTarget</span></h5></li>
41015374 731<li>
3bd6a82e 732<h5><span class="tsd-kind-parameter">eventName</span>: <span class="tsd-signature-type">string</span></h5></li>
41015374 733<li>
3bd6a82e 734<h5><code class="tsd-tag ts-flagOptional">Optional</code> <span class="tsd-kind-parameter">options</span>: <span class="tsd-signature-type ">StaticEventEmitterOptions</span></h5></li></ul></div>
735<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type ">Promise</span><span class="tsd-signature-symbol">&lt;</span><span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span><span class="tsd-signature-symbol">&gt;</span></h4><aside class="tsd-sources">
811dc01f 736<p>Inherited from EventEmitterAsyncResource.once</p>
41015374 737<ul>
811dc01f 738<li>Defined in node_modules/.pnpm/@types+node@20.2.5/node_modules/@types/node/events.d.ts:190</li></ul></aside></li></ul></section>
3bd6a82e 739<section class="tsd-panel tsd-member tsd-is-inherited tsd-is-external"><a id="setMaxListeners-2" class="tsd-anchor"></a>
41015374 740<h3 class="tsd-anchor-link"><code class="tsd-tag ts-flagStatic">Static</code> <span>set<wbr/>Max<wbr/>Listeners</span><a href="#setMaxListeners-2" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></h3>
3bd6a82e 741<ul class="tsd-signatures tsd-is-inherited tsd-is-external">
8d1797ad 742<li class="tsd-signature tsd-anchor-link" id="setMaxListeners-2.setMaxListeners-3"><span class="tsd-kind-call-signature">set<wbr/>Max<wbr/>Listeners</span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">n</span><span class="tsd-signature-symbol">?</span>, <span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">eventTargets</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">void</span><a href="#setMaxListeners-2.setMaxListeners-3" aria-label="Permalink" class="tsd-anchor-icon"><svg class="icon icon-tabler icon-tabler-link" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use href="#icon-anchor-a"></use><use href="#icon-anchor-b"></use><use href="#icon-anchor-c"></use></svg></a></li>
41015374 743<li class="tsd-description">
2c94c3a5 744<div class="tsd-comment tsd-typography"><pre><code class="language-js"><span class="hl-5">import</span><span class="hl-0"> { </span><span class="hl-3">setMaxListeners</span><span class="hl-0">, </span><span class="hl-3">EventEmitter</span><span class="hl-0"> } </span><span class="hl-5">from</span><span class="hl-0"> </span><span class="hl-6">&#39;node:events&#39;</span><span class="hl-0">;</span><br/><br/><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-7">target</span><span class="hl-0"> = </span><span class="hl-4">new</span><span class="hl-0"> </span><span class="hl-2">EventTarget</span><span class="hl-0">();</span><br/><span class="hl-4">const</span><span class="hl-0"> </span><span class="hl-7">emitter</span><span class="hl-0"> = </span><span class="hl-4">new</span><span class="hl-0"> </span><span class="hl-2">EventEmitter</span><span class="hl-0">();</span><br/><br/><span class="hl-2">setMaxListeners</span><span class="hl-0">(</span><span class="hl-1">5</span><span class="hl-0">, </span><span class="hl-3">target</span><span class="hl-0">, </span><span class="hl-3">emitter</span><span class="hl-0">);</span>
fab6d3b5 745</code><button>Copy</button></pre>
41015374
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746
747<h3>Since</h3><p>v15.4.0</p>
748</div>
749<div class="tsd-parameters">
750<h4 class="tsd-parameters-title">Parameters</h4>
751<ul class="tsd-parameter-list">
752<li>
3bd6a82e 753<h5><code class="tsd-tag ts-flagOptional">Optional</code> <span class="tsd-kind-parameter">n</span>: <span class="tsd-signature-type">number</span></h5>
41015374
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754<div class="tsd-comment tsd-typography"><p>A non-negative number. The maximum number of listeners per <code>EventTarget</code> event.</p>
755</div></li>
756<li>
3bd6a82e 757<h5><code class="tsd-tag ts-flagRest">Rest</code> <span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">eventTargets</span>: <span class="tsd-signature-symbol">(</span><span class="tsd-signature-type ">EventEmitter</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type ">_DOMEventTarget</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">[]</span></h5></li></ul></div>
41015374 758<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">void</span></h4><aside class="tsd-sources">
811dc01f 759<p>Inherited from EventEmitterAsyncResource.setMaxListeners</p>
41015374 760<ul>
811dc01f 761<li>Defined in node_modules/.pnpm/@types+node@20.2.5/node_modules/@types/node/events.d.ts:311</li></ul></aside></li></ul></section></section></div>
ec06e4dd 762<div class="col-sidebar">
763<div class="page-menu">
41015374
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764<div class="tsd-navigation settings">
765<details class="tsd-index-accordion"><summary class="tsd-accordion-summary">
ec06e4dd 766<h3><svg width="20" height="20" viewBox="0 0 24 24" fill="none"><path d="M4.93896 8.531L12 15.591L19.061 8.531L16.939 6.409L12 11.349L7.06098 6.409L4.93896 8.531Z" fill="var(--color-text)"></path></svg>Settings</h3></summary>
41015374
JB
767<div class="tsd-accordion-details">
768<div class="tsd-filter-visibility">
769<h4 class="uppercase">Member Visibility</h4><form>
770<ul id="tsd-filter-options">
771<li class="tsd-filter-item"><label class="tsd-filter-input"><input type="checkbox" id="tsd-filter-protected" name="protected"/><svg width="32" height="32" viewBox="0 0 32 32" aria-hidden="true"><rect class="tsd-checkbox-background" width="30" height="30" x="1" y="1" rx="6" fill="none"></rect><path class="tsd-checkbox-checkmark" d="M8.35422 16.8214L13.2143 21.75L24.6458 10.25" stroke="none" stroke-width="3.5" stroke-linejoin="round" fill="none"></path></svg><span>Protected</span></label></li>
772<li class="tsd-filter-item"><label class="tsd-filter-input"><input type="checkbox" id="tsd-filter-private" name="private"/><svg width="32" height="32" viewBox="0 0 32 32" aria-hidden="true"><rect class="tsd-checkbox-background" width="30" height="30" x="1" y="1" rx="6" fill="none"></rect><path class="tsd-checkbox-checkmark" d="M8.35422 16.8214L13.2143 21.75L24.6458 10.25" stroke="none" stroke-width="3.5" stroke-linejoin="round" fill="none"></path></svg><span>Private</span></label></li>
773<li class="tsd-filter-item"><label class="tsd-filter-input"><input type="checkbox" id="tsd-filter-inherited" name="inherited" checked/><svg width="32" height="32" viewBox="0 0 32 32" aria-hidden="true"><rect class="tsd-checkbox-background" width="30" height="30" x="1" y="1" rx="6" fill="none"></rect><path class="tsd-checkbox-checkmark" d="M8.35422 16.8214L13.2143 21.75L24.6458 10.25" stroke="none" stroke-width="3.5" stroke-linejoin="round" fill="none"></path></svg><span>Inherited</span></label></li>
774<li class="tsd-filter-item"><label class="tsd-filter-input"><input type="checkbox" id="tsd-filter-external" name="external"/><svg width="32" height="32" viewBox="0 0 32 32" aria-hidden="true"><rect class="tsd-checkbox-background" width="30" height="30" x="1" y="1" rx="6" fill="none"></rect><path class="tsd-checkbox-checkmark" d="M8.35422 16.8214L13.2143 21.75L24.6458 10.25" stroke="none" stroke-width="3.5" stroke-linejoin="round" fill="none"></path></svg><span>External</span></label></li></ul></form></div>
775<div class="tsd-theme-toggle">
3bd6a82e 776<h4 class="uppercase">Theme</h4><select id="tsd-theme"><option value="os">OS</option><option value="light">Light</option><option value="dark">Dark</option></select></div></div></details></div>
ec06e4dd 777<details open class="tsd-index-accordion tsd-page-navigation"><summary class="tsd-accordion-summary">
778<h3><svg width="20" height="20" viewBox="0 0 24 24" fill="none"><path d="M4.93896 8.531L12 15.591L19.061 8.531L16.939 6.409L12 11.349L7.06098 6.409L4.93896 8.531Z" fill="var(--color-text)"></path></svg>On This Page</h3></summary>
41015374
JB
779<div class="tsd-accordion-details">
780<ul>
3bd6a82e 781<li><a href="#constructor" class="tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-512-path"></use><use href="#icon-512-text"></use></svg><span>constructor</span></a></li>
782<li><a href="#captureRejectionSymbol" class="tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-1024-path"></use><use href="#icon-1024-text"></use></svg><span>capture<wbr/>Rejection<wbr/>Symbol</span></a></li>
783<li><a href="#captureRejections" class="tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-1024-path"></use><use href="#icon-1024-text"></use></svg><span>capture<wbr/>Rejections</span></a></li>
784<li><a href="#defaultMaxListeners" class="tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-1024-path"></use><use href="#icon-1024-text"></use></svg><span>default<wbr/>Max<wbr/>Listeners</span></a></li>
785<li><a href="#errorMonitor" class="tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-1024-path"></use><use href="#icon-1024-text"></use></svg><span>error<wbr/>Monitor</span></a></li>
786<li><a href="#addListener" class="tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>add<wbr/>Listener</span></a></li>
787<li><a href="#emit" class="tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>emit</span></a></li>
788<li><a href="#eventNames" class="tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>event<wbr/>Names</span></a></li>
789<li><a href="#getMaxListeners" class="tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>get<wbr/>Max<wbr/>Listeners</span></a></li>
790<li><a href="#listenerCount" class="tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>listener<wbr/>Count</span></a></li>
791<li><a href="#listeners" class="tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>listeners</span></a></li>
792<li><a href="#off" class="tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>off</span></a></li>
793<li><a href="#on" class="tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>on</span></a></li>
794<li><a href="#once" class="tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>once</span></a></li>
795<li><a href="#prependListener" class="tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>prepend<wbr/>Listener</span></a></li>
796<li><a href="#prependOnceListener" class="tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>prepend<wbr/>Once<wbr/>Listener</span></a></li>
797<li><a href="#rawListeners" class="tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>raw<wbr/>Listeners</span></a></li>
798<li><a href="#removeAllListeners" class="tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>remove<wbr/>All<wbr/>Listeners</span></a></li>
799<li><a href="#removeListener" class="tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>remove<wbr/>Listener</span></a></li>
800<li><a href="#setMaxListeners" class="tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>set<wbr/>Max<wbr/>Listeners</span></a></li>
801<li><a href="#getEventListeners" class="tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>get<wbr/>Event<wbr/>Listeners</span></a></li>
802<li><a href="#listenerCount-2" class="tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>listener<wbr/>Count</span></a></li>
803<li><a href="#on-2" class="tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>on</span></a></li>
804<li><a href="#once-2" class="tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>once</span></a></li>
805<li><a href="#setMaxListeners-2" class="tsd-is-inherited tsd-is-external"><svg class="tsd-kind-icon" width="24" height="24" viewBox="0 0 24 24"><use href="#icon-2048-path"></use><use href="#icon-2048-text"></use></svg><span>set<wbr/>Max<wbr/>Listeners</span></a></li></ul></div></details></div>
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