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href="/docs/guide">Introduction</a><button aria-label="Toggle the collapsible sidebar category 'Introduction'" type="button" class="clean-btn menu__caret"></button></div></li></ul></nav></div></aside><main class="docMainContainer_gTbr"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="docItemContainer_Djhp"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_OVgt"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="/docs/api"><span itemprop="name">API</span></a><meta itemprop="position" content="1"></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Classes</span><meta itemprop="position" content="2"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">SernEmitter</span><meta itemprop="position" content="3"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Class: SernEmitter</h1></header><h2 class="anchor anchorWithStickyNavbar_LWe7" id="hierarchy">Hierarchy<a class="hash-link" href="#hierarchy" title="Direct link to heading"></a></h2><ul><li><p><code>EventEmitter</code></p><p>↳ <strong><code>SernEmitter</code></strong></p></li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="constructors">Constructors<a class="hash-link" href="#constructors" title="Direct link to heading"></a></h2><h3 class="anchor anchorWithStickyNavbar_LWe7" id="constructor">constructor<a class="hash-link" href="#constructor" title="Direct link to heading"></a></h3><p>• <strong>new SernEmitter</strong>(<code>options?</code>)</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="parameters">Parameters<a class="hash-link" href="#parameters" title="Direct link to heading"></a></h4><table><thead><tr><th align="left">Name</th><th align="left">Type</th></tr></thead><tbody><tr><td align="left"><code>options?</code></td><td align="left"><code>EventEmitterOptions</code></td></tr></tbody></table><h4 class="anchor anchorWithStickyNavbar_LWe7" id="inherited-from">Inherited from<a class="hash-link" href="#inherited-from" title="Direct link to heading"></a></h4><p>EventEmitter.constructor</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="defined-in">Defined in<a class="hash-link" href="#defined-in" title="Direct link to heading"></a></h4><p>node_modules/@types/node/events.d.ts:74</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="properties">Properties<a class="hash-link" href="#properties" title="Direct link to heading"></a></h2><h3 class="anchor anchorWithStickyNavbar_LWe7" id="capturerejectionsymbol">captureRejectionSymbol<a class="hash-link" href="#capturerejectionsymbol" title="Direct link to heading"></a></h3><p>▪ <code>Static</code> <code>Readonly</code> <strong>captureRejectionSymbol</strong>: typeof <a href="/docs/api/classes/SernEmitter#capturerejectionsymbol"><code>captureRejectionSymbol</code></a></p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="inherited-from-1">Inherited from<a class="hash-link" href="#inherited-from-1" title="Direct link to heading"></a></h4><p>EventEmitter.captureRejectionSymbol</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="defined-in-1">Defined in<a class="hash-link" href="#defined-in-1" title="Direct link to heading"></a></h4><p>node_modules/@types/node/events.d.ts:291</p><hr><h3 class="anchor anchorWithStickyNavbar_LWe7" id="capturerejections">captureRejections<a class="hash-link" href="#capturerejections" title="Direct link to heading"></a></h3><p>▪ <code>Static</code> <strong>captureRejections</strong>: <code>boolean</code></p><p>Sets or gets the default captureRejection value for all emitters.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="inherited-from-2">Inherited from<a class="hash-link" href="#inherited-from-2" title="Direct link to heading"></a></h4><p>EventEmitter.captureRejections</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="defined-in-2">Defined in<a class="hash-link" href="#defined-in-2" title="Direct link to heading"></a></h4><p>node_modules/@types/node/events.d.ts:296</p><hr><h3 class="anchor anchorWithStickyNavbar_LWe7" id="defaultmaxlisteners">defaultMaxListeners<a class="hash-link" href="#defaultmaxlisteners" title="Direct link to heading"></a></h3><p>▪ <code>Static</code> <strong>defaultMaxListeners</strong>: <code>number</code></p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="inherited-from-3">Inherited from<a class="hash-link" href="#inherited-from-3" title="Direct link to heading"></a></h4><p>EventEmitter.defaultMaxListeners</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="defined-in-3">Defined in<a class="hash-link" href="#defined-in-3" title="Direct link to heading"></a></h4><p>node_modules/@types/node/events.d.ts:297</p><hr><h3 class="anchor anchorWithStickyNavbar_LWe7" id="errormonitor">errorMonitor<a class="hash-link" href="#errormonitor" title="Direct link to heading"></a></h3><p>▪ <code>Static</code> <code>Readonly</code> <strong>errorMonitor</strong>: typeof <a href="/docs/api/classes/SernEmitter#errormonitor"><code>errorMonitor</code></a></p><p>This symbol shall be used to install a listener for only monitoring <code>'error'</code>
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events. Listeners installed using this symbol are called before the regular
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<code>'error'</code> listeners are called.</p><p>Installing a listener using this symbol does not change the behavior once an
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<code>'error'</code> event is emitted, therefore the process will still crash if no
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regular <code>'error'</code> listener is installed.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="inherited-from-4">Inherited from<a class="hash-link" href="#inherited-from-4" title="Direct link to heading"></a></h4><p>EventEmitter.errorMonitor</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="defined-in-4">Defined in<a class="hash-link" href="#defined-in-4" title="Direct link to heading"></a></h4><p>node_modules/@types/node/events.d.ts:290</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="methods">Methods<a class="hash-link" href="#methods" title="Direct link to heading"></a></h2><h3 class="anchor anchorWithStickyNavbar_LWe7" id="addlistener">addListener<a class="hash-link" href="#addlistener" title="Direct link to heading"></a></h3><p>▸ <strong>addListener</strong>(<code>eventName</code>, <code>listener</code>): <a href="/docs/api/classes/SernEmitter"><code>SernEmitter</code></a></p><p>Alias for <code>emitter.on(eventName, listener)</code>.</p><p><strong><code>Since</code></strong></p><p>v0.1.26</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="parameters-1">Parameters<a class="hash-link" href="#parameters-1" title="Direct link to heading"></a></h4><table><thead><tr><th align="left">Name</th><th align="left">Type</th></tr></thead><tbody><tr><td align="left"><code>eventName</code></td><td align="left"><code>string</code> <!-- -->|<!-- --> <code>symbol</code></td></tr><tr><td align="left"><code>listener</code></td><td align="left">(...<code>args</code>: <code>any</code>[]) => <code>void</code></td></tr></tbody></table><h4 class="anchor anchorWithStickyNavbar_LWe7" id="returns">Returns<a class="hash-link" href="#returns" title="Direct link to heading"></a></h4><p><a href="/docs/api/classes/SernEmitter"><code>SernEmitter</code></a></p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="inherited-from-5">Inherited from<a class="hash-link" href="#inherited-from-5" title="Direct link to heading"></a></h4><p>EventEmitter.addListener</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="defined-in-5">Defined in<a class="hash-link" href="#defined-in-5" title="Direct link to heading"></a></h4><p>node_modules/@types/node/events.d.ts:317</p><hr><h3 class="anchor anchorWithStickyNavbar_LWe7" id="emit">emit<a class="hash-link" href="#emit" title="Direct link to heading"></a></h3><p>▸ <strong>emit</strong><<code>T</code>><!-- -->(<code>eventName</code>, ...<code>args</code>): <code>boolean</code></p><p>Listening to sern events with on. This event stays on until a crash or a normal exit</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="type-parameters">Type parameters<a class="hash-link" href="#type-parameters" title="Direct link to heading"></a></h4><table><thead><tr><th align="left">Name</th><th align="left">Type</th></tr></thead><tbody><tr><td align="left"><code>T</code></td><td align="left">extends keyof <a href="/docs/api/modules#serneventsmapping"><code>SernEventsMapping</code></a></td></tr></tbody></table><h4 class="anchor anchorWithStickyNavbar_LWe7" id="parameters-2">Parameters<a class="hash-link" href="#parameters-2" title="Direct link to heading"></a></h4><table><thead><tr><th align="left">Name</th><th align="left">Type</th><th align="left">Description</th></tr></thead><tbody><tr><td align="left"><code>eventName</code></td><td align="left"><code>T</code></td><td align="left"></td></tr><tr><td align="left"><code>...args</code></td><td align="left"><a href="/docs/api/modules#serneventsmapping"><code>SernEventsMapping</code></a>[<code>T</code>]</td><td align="left">the arguments for emitting the eventName</td></tr></tbody></table><h4 class="anchor anchorWithStickyNavbar_LWe7" id="returns-1">Returns<a class="hash-link" href="#returns-1" title="Direct link to heading"></a></h4><p><code>boolean</code></p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="overrides">Overrides<a class="hash-link" href="#overrides" title="Direct link to heading"></a></h4><p>EventEmitter.emit</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="defined-in-6">Defined in<a class="hash-link" href="#defined-in-6" title="Direct link to heading"></a></h4><p><a href="https://github.com/sern-handler/handler/blob/3daacfc/src/handler/sernEmitter.ts#L32" target="_blank" rel="noopener noreferrer">src/handler/sernEmitter.ts:32</a></p><hr><h3 class="anchor anchorWithStickyNavbar_LWe7" id="eventnames">eventNames<a class="hash-link" href="#eventnames" title="Direct link to heading"></a></h3><p>▸ <strong>eventNames</strong>(): (<code>string</code> <!-- -->|<!-- --> <code>symbol</code>)[]</p><p>Returns an array listing the events for which the emitter has registered
|
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listeners. The values in the array are strings or <code>Symbol</code>s.</p><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#403f53;--prism-background-color:#FBFBFB"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-js codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#403f53"><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> </span><span class="token maybe-class-name">EventEmitter</span><span class="token plain"> </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token function" style="color:rgb(153, 76, 195);font-style:italic">require</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'events'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> myEE </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">new</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(17, 17, 17)">EventEmitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain">myEE</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">on</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'foo'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:rgb(12, 150, 155)">=></span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain">myEE</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">on</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'bar'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:rgb(12, 150, 155)">=></span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> sym </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token known-class-name class-name" style="color:rgb(17, 17, 17)">Symbol</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'symbol'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain">myEE</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">on</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token plain">sym</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:rgb(12, 150, 155)">=></span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token console class-name" style="color:rgb(17, 17, 17)">console</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">log</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token plain">myEE</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">eventNames</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// Prints: [ 'foo', 'bar', Symbol(symbol) ]</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p><strong><code>Since</code></strong></p><p>v6.0.0</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="returns-2">Returns<a class="hash-link" href="#returns-2" title="Direct link to heading"></a></h4><p>(<code>string</code> <!-- -->|<!-- --> <code>symbol</code>)[]</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="inherited-from-6">Inherited from<a class="hash-link" href="#inherited-from-6" title="Direct link to heading"></a></h4><p>EventEmitter.eventNames</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="defined-in-7">Defined in<a class="hash-link" href="#defined-in-7" title="Direct link to heading"></a></h4><p>node_modules/@types/node/events.d.ts:632</p><hr><h3 class="anchor anchorWithStickyNavbar_LWe7" id="getmaxlisteners">getMaxListeners<a class="hash-link" href="#getmaxlisteners" title="Direct link to heading"></a></h3><p>▸ <strong>getMaxListeners</strong>(): <code>number</code></p><p>Returns the current max listener value for the <code>EventEmitter</code> which is either
|
||
set by <code>emitter.setMaxListeners(n)</code> or defaults to <a href="/docs/api/classes/SernEmitter#defaultmaxlisteners">defaultMaxListeners</a>.</p><p><strong><code>Since</code></strong></p><p>v1.0.0</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="returns-3">Returns<a class="hash-link" href="#returns-3" title="Direct link to heading"></a></h4><p><code>number</code></p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="inherited-from-7">Inherited from<a class="hash-link" href="#inherited-from-7" title="Direct link to heading"></a></h4><p>EventEmitter.getMaxListeners</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="defined-in-8">Defined in<a class="hash-link" href="#defined-in-8" title="Direct link to heading"></a></h4><p>node_modules/@types/node/events.d.ts:489</p><hr><h3 class="anchor anchorWithStickyNavbar_LWe7" id="listenercount">listenerCount<a class="hash-link" href="#listenercount" title="Direct link to heading"></a></h3><p>▸ <strong>listenerCount</strong>(<code>eventName</code>): <code>number</code></p><p>Returns the number of listeners listening to the event named <code>eventName</code>.</p><p><strong><code>Since</code></strong></p><p>v3.2.0</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="parameters-3">Parameters<a class="hash-link" href="#parameters-3" title="Direct link to heading"></a></h4><table><thead><tr><th align="left">Name</th><th align="left">Type</th><th align="left">Description</th></tr></thead><tbody><tr><td align="left"><code>eventName</code></td><td align="left"><code>string</code> <!-- -->|<!-- --> <code>symbol</code></td><td align="left">The name of the event being listened for</td></tr></tbody></table><h4 class="anchor anchorWithStickyNavbar_LWe7" id="returns-4">Returns<a class="hash-link" href="#returns-4" title="Direct link to heading"></a></h4><p><code>number</code></p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="inherited-from-8">Inherited from<a class="hash-link" href="#inherited-from-8" title="Direct link to heading"></a></h4><p>EventEmitter.listenerCount</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="defined-in-9">Defined in<a class="hash-link" href="#defined-in-9" title="Direct link to heading"></a></h4><p>node_modules/@types/node/events.d.ts:579</p><hr><h3 class="anchor anchorWithStickyNavbar_LWe7" id="listeners">listeners<a class="hash-link" href="#listeners" title="Direct link to heading"></a></h3><p>▸ <strong>listeners</strong>(<code>eventName</code>): <code>Function</code>[]</p><p>Returns a copy of the array of listeners for the event named <code>eventName</code>.</p><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#403f53;--prism-background-color:#FBFBFB"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-js codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#403f53"><span class="token plain">server</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">on</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'connection'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token parameter">stream</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:rgb(12, 150, 155)">=></span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token console class-name" style="color:rgb(17, 17, 17)">console</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">log</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'someone connected!'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token console class-name" style="color:rgb(17, 17, 17)">console</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">log</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token plain">util</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">inspect</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token plain">server</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">listeners</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'connection'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// Prints: [ [Function] ]</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p><strong><code>Since</code></strong></p><p>v0.1.26</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="parameters-4">Parameters<a class="hash-link" href="#parameters-4" title="Direct link to heading"></a></h4><table><thead><tr><th align="left">Name</th><th align="left">Type</th></tr></thead><tbody><tr><td align="left"><code>eventName</code></td><td align="left"><code>string</code> <!-- -->|<!-- --> <code>symbol</code></td></tr></tbody></table><h4 class="anchor anchorWithStickyNavbar_LWe7" id="returns-5">Returns<a class="hash-link" href="#returns-5" title="Direct link to heading"></a></h4><p><code>Function</code>[]</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="inherited-from-9">Inherited from<a class="hash-link" href="#inherited-from-9" title="Direct link to heading"></a></h4><p>EventEmitter.listeners</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="defined-in-10">Defined in<a class="hash-link" href="#defined-in-10" title="Direct link to heading"></a></h4><p>node_modules/@types/node/events.d.ts:502</p><hr><h3 class="anchor anchorWithStickyNavbar_LWe7" id="off">off<a class="hash-link" href="#off" title="Direct link to heading"></a></h3><p>▸ <strong>off</strong>(<code>eventName</code>, <code>listener</code>): <a href="/docs/api/classes/SernEmitter"><code>SernEmitter</code></a></p><p>Alias for <code>emitter.removeListener()</code>.</p><p><strong><code>Since</code></strong></p><p>v10.0.0</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="parameters-5">Parameters<a class="hash-link" href="#parameters-5" title="Direct link to heading"></a></h4><table><thead><tr><th align="left">Name</th><th align="left">Type</th></tr></thead><tbody><tr><td align="left"><code>eventName</code></td><td align="left"><code>string</code> <!-- -->|<!-- --> <code>symbol</code></td></tr><tr><td align="left"><code>listener</code></td><td align="left">(...<code>args</code>: <code>any</code>[]) => <code>void</code></td></tr></tbody></table><h4 class="anchor anchorWithStickyNavbar_LWe7" id="returns-6">Returns<a class="hash-link" href="#returns-6" title="Direct link to heading"></a></h4><p><a href="/docs/api/classes/SernEmitter"><code>SernEmitter</code></a></p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="inherited-from-10">Inherited from<a class="hash-link" href="#inherited-from-10" title="Direct link to heading"></a></h4><p>EventEmitter.off</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="defined-in-11">Defined in<a class="hash-link" href="#defined-in-11" title="Direct link to heading"></a></h4><p>node_modules/@types/node/events.d.ts:462</p><hr><h3 class="anchor anchorWithStickyNavbar_LWe7" id="on">on<a class="hash-link" href="#on" title="Direct link to heading"></a></h3><p>▸ <strong>on</strong><<code>T</code>><!-- -->(<code>eventName</code>, <code>listener</code>): <a href="/docs/api/classes/SernEmitter"><code>SernEmitter</code></a></p><p>Listening to sern events with on. This event stays on until a crash or a normal exit</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="type-parameters-1">Type parameters<a class="hash-link" href="#type-parameters-1" title="Direct link to heading"></a></h4><table><thead><tr><th align="left">Name</th><th align="left">Type</th></tr></thead><tbody><tr><td align="left"><code>T</code></td><td align="left">extends keyof <a href="/docs/api/modules#serneventsmapping"><code>SernEventsMapping</code></a></td></tr></tbody></table><h4 class="anchor anchorWithStickyNavbar_LWe7" id="parameters-6">Parameters<a class="hash-link" href="#parameters-6" title="Direct link to heading"></a></h4><table><thead><tr><th align="left">Name</th><th align="left">Type</th><th align="left">Description</th></tr></thead><tbody><tr><td align="left"><code>eventName</code></td><td align="left"><code>T</code></td><td align="left"></td></tr><tr><td align="left"><code>listener</code></td><td align="left">(...<code>args</code>: <a href="/docs/api/modules#serneventsmapping"><code>SernEventsMapping</code></a>[<code>T</code>][]<!-- -->) => <code>void</code></td><td align="left">what to do with the data</td></tr></tbody></table><h4 class="anchor anchorWithStickyNavbar_LWe7" id="returns-7">Returns<a class="hash-link" href="#returns-7" title="Direct link to heading"></a></h4><p><a href="/docs/api/classes/SernEmitter"><code>SernEmitter</code></a></p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="overrides-1">Overrides<a class="hash-link" href="#overrides-1" title="Direct link to heading"></a></h4><p>EventEmitter.on</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="defined-in-12">Defined in<a class="hash-link" href="#defined-in-12" title="Direct link to heading"></a></h4><p><a href="https://github.com/sern-handler/handler/blob/3daacfc/src/handler/sernEmitter.ts#L10" target="_blank" rel="noopener noreferrer">src/handler/sernEmitter.ts:10</a></p><hr><h3 class="anchor anchorWithStickyNavbar_LWe7" id="once">once<a class="hash-link" href="#once" title="Direct link to heading"></a></h3><p>▸ <strong>once</strong><<code>T</code>><!-- -->(<code>eventName</code>, <code>listener</code>): <a href="/docs/api/classes/SernEmitter"><code>SernEmitter</code></a></p><p>Listening to sern events with on. This event stays on until a crash or a normal exit</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="type-parameters-2">Type parameters<a class="hash-link" href="#type-parameters-2" title="Direct link to heading"></a></h4><table><thead><tr><th align="left">Name</th><th align="left">Type</th></tr></thead><tbody><tr><td align="left"><code>T</code></td><td align="left">extends keyof <a href="/docs/api/modules#serneventsmapping"><code>SernEventsMapping</code></a></td></tr></tbody></table><h4 class="anchor anchorWithStickyNavbar_LWe7" id="parameters-7">Parameters<a class="hash-link" href="#parameters-7" title="Direct link to heading"></a></h4><table><thead><tr><th align="left">Name</th><th align="left">Type</th><th align="left">Description</th></tr></thead><tbody><tr><td align="left"><code>eventName</code></td><td align="left"><code>T</code></td><td align="left"></td></tr><tr><td align="left"><code>listener</code></td><td align="left">(...<code>args</code>: <a href="/docs/api/modules#serneventsmapping"><code>SernEventsMapping</code></a>[<code>T</code>][]<!-- -->) => <code>void</code></td><td align="left">what to do with the data</td></tr></tbody></table><h4 class="anchor anchorWithStickyNavbar_LWe7" id="returns-8">Returns<a class="hash-link" href="#returns-8" title="Direct link to heading"></a></h4><p><a href="/docs/api/classes/SernEmitter"><code>SernEmitter</code></a></p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="overrides-2">Overrides<a class="hash-link" href="#overrides-2" title="Direct link to heading"></a></h4><p>EventEmitter.once</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="defined-in-13">Defined in<a class="hash-link" href="#defined-in-13" title="Direct link to heading"></a></h4><p><a href="https://github.com/sern-handler/handler/blob/3daacfc/src/handler/sernEmitter.ts#L21" target="_blank" rel="noopener noreferrer">src/handler/sernEmitter.ts:21</a></p><hr><h3 class="anchor anchorWithStickyNavbar_LWe7" id="prependlistener">prependListener<a class="hash-link" href="#prependlistener" title="Direct link to heading"></a></h3><p>▸ <strong>prependListener</strong>(<code>eventName</code>, <code>listener</code>): <a href="/docs/api/classes/SernEmitter"><code>SernEmitter</code></a></p><p>Adds the <code>listener</code> function to the <em>beginning</em> of the listeners array for the
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event named <code>eventName</code>. No checks are made to see if the <code>listener</code> has
|
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already 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
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times.</p><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#403f53;--prism-background-color:#FBFBFB"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-js codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#403f53"><span class="token plain">server</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">prependListener</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'connection'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token parameter">stream</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:rgb(12, 150, 155)">=></span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token console class-name" style="color:rgb(17, 17, 17)">console</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">log</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'someone connected!'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Returns a reference to the <code>EventEmitter</code>, so that calls can be chained.</p><p><strong><code>Since</code></strong></p><p>v6.0.0</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="parameters-8">Parameters<a class="hash-link" href="#parameters-8" title="Direct link to heading"></a></h4><table><thead><tr><th align="left">Name</th><th align="left">Type</th><th align="left">Description</th></tr></thead><tbody><tr><td align="left"><code>eventName</code></td><td align="left"><code>string</code> <!-- -->|<!-- --> <code>symbol</code></td><td align="left">The name of the event.</td></tr><tr><td align="left"><code>listener</code></td><td align="left">(...<code>args</code>: <code>any</code>[]) => <code>void</code></td><td align="left">The callback function</td></tr></tbody></table><h4 class="anchor anchorWithStickyNavbar_LWe7" id="returns-9">Returns<a class="hash-link" href="#returns-9" title="Direct link to heading"></a></h4><p><a href="/docs/api/classes/SernEmitter"><code>SernEmitter</code></a></p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="inherited-from-11">Inherited from<a class="hash-link" href="#inherited-from-11" title="Direct link to heading"></a></h4><p>EventEmitter.prependListener</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="defined-in-14">Defined in<a class="hash-link" href="#defined-in-14" title="Direct link to heading"></a></h4><p>node_modules/@types/node/events.d.ts:597</p><hr><h3 class="anchor anchorWithStickyNavbar_LWe7" id="prependoncelistener">prependOnceListener<a class="hash-link" href="#prependoncelistener" title="Direct link to heading"></a></h3><p>▸ <strong>prependOnceListener</strong>(<code>eventName</code>, <code>listener</code>): <a href="/docs/api/classes/SernEmitter"><code>SernEmitter</code></a></p><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
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listener is removed, and then invoked.</p><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#403f53;--prism-background-color:#FBFBFB"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-js codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#403f53"><span class="token plain">server</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">prependOnceListener</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'connection'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token parameter">stream</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:rgb(12, 150, 155)">=></span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token console class-name" style="color:rgb(17, 17, 17)">console</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">log</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'Ah, we have our first user!'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Returns a reference to the <code>EventEmitter</code>, so that calls can be chained.</p><p><strong><code>Since</code></strong></p><p>v6.0.0</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="parameters-9">Parameters<a class="hash-link" href="#parameters-9" title="Direct link to heading"></a></h4><table><thead><tr><th align="left">Name</th><th align="left">Type</th><th align="left">Description</th></tr></thead><tbody><tr><td align="left"><code>eventName</code></td><td align="left"><code>string</code> <!-- -->|<!-- --> <code>symbol</code></td><td align="left">The name of the event.</td></tr><tr><td align="left"><code>listener</code></td><td align="left">(...<code>args</code>: <code>any</code>[]) => <code>void</code></td><td align="left">The callback function</td></tr></tbody></table><h4 class="anchor anchorWithStickyNavbar_LWe7" id="returns-10">Returns<a class="hash-link" href="#returns-10" title="Direct link to heading"></a></h4><p><a href="/docs/api/classes/SernEmitter"><code>SernEmitter</code></a></p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="inherited-from-12">Inherited from<a class="hash-link" href="#inherited-from-12" title="Direct link to heading"></a></h4><p>EventEmitter.prependOnceListener</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="defined-in-15">Defined in<a class="hash-link" href="#defined-in-15" title="Direct link to heading"></a></h4><p>node_modules/@types/node/events.d.ts:613</p><hr><h3 class="anchor anchorWithStickyNavbar_LWe7" id="rawlisteners">rawListeners<a class="hash-link" href="#rawlisteners" title="Direct link to heading"></a></h3><p>▸ <strong>rawListeners</strong>(<code>eventName</code>): <code>Function</code>[]</p><p>Returns a copy of the array of listeners for the event named <code>eventName</code>,
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including any wrappers (such as those created by <code>.once()</code>).</p><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#403f53;--prism-background-color:#FBFBFB"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-js codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#403f53"><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> emitter </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">new</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(17, 17, 17)">EventEmitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain">emitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">once</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'log'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:rgb(12, 150, 155)">=></span><span class="token plain"> </span><span class="token console class-name" style="color:rgb(17, 17, 17)">console</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">log</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'log once'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// Returns a new Array with a function `onceWrapper` which has a property</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// `listener` which contains the original listener bound above</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> listeners </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> emitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">rawListeners</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'log'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> logFnWrapper </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> listeners</span><span class="token punctuation" style="color:rgb(153, 76, 195)">[</span><span class="token number" style="color:rgb(170, 9, 130)">0</span><span class="token punctuation" style="color:rgb(153, 76, 195)">]</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// Logs "log once" to the console and does not unbind the `once` event</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain">logFnWrapper</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">listener</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// Logs "log once" to the console and removes the listener</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token function" style="color:rgb(153, 76, 195);font-style:italic">logFnWrapper</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain">emitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">on</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'log'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:rgb(12, 150, 155)">=></span><span class="token plain"> </span><span class="token console class-name" style="color:rgb(17, 17, 17)">console</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">log</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'log persistently'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// Will return a new Array with a single function bound by `.on()` above</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> newListeners </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> emitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">rawListeners</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'log'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// Logs "log persistently" twice</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain">newListeners</span><span class="token punctuation" style="color:rgb(153, 76, 195)">[</span><span class="token number" style="color:rgb(170, 9, 130)">0</span><span class="token punctuation" style="color:rgb(153, 76, 195)">]</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain">emitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">emit</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'log'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p><strong><code>Since</code></strong></p><p>v9.4.0</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="parameters-10">Parameters<a class="hash-link" href="#parameters-10" title="Direct link to heading"></a></h4><table><thead><tr><th align="left">Name</th><th align="left">Type</th></tr></thead><tbody><tr><td align="left"><code>eventName</code></td><td align="left"><code>string</code> <!-- -->|<!-- --> <code>symbol</code></td></tr></tbody></table><h4 class="anchor anchorWithStickyNavbar_LWe7" id="returns-11">Returns<a class="hash-link" href="#returns-11" title="Direct link to heading"></a></h4><p><code>Function</code>[]</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="inherited-from-13">Inherited from<a class="hash-link" href="#inherited-from-13" title="Direct link to heading"></a></h4><p>EventEmitter.rawListeners</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="defined-in-16">Defined in<a class="hash-link" href="#defined-in-16" title="Direct link to heading"></a></h4><p>node_modules/@types/node/events.d.ts:532</p><hr><h3 class="anchor anchorWithStickyNavbar_LWe7" id="removealllisteners">removeAllListeners<a class="hash-link" href="#removealllisteners" title="Direct link to heading"></a></h3><p>▸ <strong>removeAllListeners</strong>(<code>event?</code>): <a href="/docs/api/classes/SernEmitter"><code>SernEmitter</code></a></p><p>Removes all listeners, or those of the specified <code>eventName</code>.</p><p>It is bad practice to remove listeners added elsewhere in the code,
|
||
particularly when the <code>EventEmitter</code> instance was created by some other
|
||
component or module (e.g. sockets or file streams).</p><p>Returns a reference to the <code>EventEmitter</code>, so that calls can be chained.</p><p><strong><code>Since</code></strong></p><p>v0.1.26</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="parameters-11">Parameters<a class="hash-link" href="#parameters-11" title="Direct link to heading"></a></h4><table><thead><tr><th align="left">Name</th><th align="left">Type</th></tr></thead><tbody><tr><td align="left"><code>event?</code></td><td align="left"><code>string</code> <!-- -->|<!-- --> <code>symbol</code></td></tr></tbody></table><h4 class="anchor anchorWithStickyNavbar_LWe7" id="returns-12">Returns<a class="hash-link" href="#returns-12" title="Direct link to heading"></a></h4><p><a href="/docs/api/classes/SernEmitter"><code>SernEmitter</code></a></p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="inherited-from-14">Inherited from<a class="hash-link" href="#inherited-from-14" title="Direct link to heading"></a></h4><p>EventEmitter.removeAllListeners</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="defined-in-17">Defined in<a class="hash-link" href="#defined-in-17" title="Direct link to heading"></a></h4><p>node_modules/@types/node/events.d.ts:473</p><hr><h3 class="anchor anchorWithStickyNavbar_LWe7" id="removelistener">removeListener<a class="hash-link" href="#removelistener" title="Direct link to heading"></a></h3><p>▸ <strong>removeListener</strong>(<code>eventName</code>, <code>listener</code>): <a href="/docs/api/classes/SernEmitter"><code>SernEmitter</code></a></p><p>Removes the specified <code>listener</code> from the listener array for the event named<code>eventName</code>.</p><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#403f53;--prism-background-color:#FBFBFB"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-js codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#403f53"><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> </span><span class="token function-variable function" style="color:rgb(153, 76, 195);font-style:italic">callback</span><span class="token plain"> </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token parameter">stream</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:rgb(12, 150, 155)">=></span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token console class-name" style="color:rgb(17, 17, 17)">console</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">log</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'someone connected!'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain">server</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">on</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'connection'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> callback</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// ...</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain">server</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">removeListener</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'connection'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> callback</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p><code>removeListener()</code> will remove, at most, one instance of a listener from the
|
||
listener array. If any single listener has been added multiple times to the
|
||
listener array for the specified <code>eventName</code>, then <code>removeListener()</code> must be
|
||
called multiple times to remove each instance.</p><p>Once an event is emitted, all listeners attached to it at the
|
||
time 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
|
||
will not remove them from<code>emit()</code> in progress. Subsequent events behave as expected.</p><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#403f53;--prism-background-color:#FBFBFB"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-js codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#403f53"><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> myEmitter </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">new</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(17, 17, 17)">MyEmitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> </span><span class="token function-variable function" style="color:rgb(153, 76, 195);font-style:italic">callbackA</span><span class="token plain"> </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:rgb(12, 150, 155)">=></span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token console class-name" style="color:rgb(17, 17, 17)">console</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">log</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'A'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> myEmitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">removeListener</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'event'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> callbackB</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> </span><span class="token function-variable function" style="color:rgb(153, 76, 195);font-style:italic">callbackB</span><span class="token plain"> </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:rgb(12, 150, 155)">=></span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token console class-name" style="color:rgb(17, 17, 17)">console</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">log</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'B'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain">myEmitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">on</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'event'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> callbackA</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain">myEmitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">on</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'event'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> callbackB</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// callbackA removes listener callbackB but it will still be called.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// Internal listener array at time of emit [callbackA, callbackB]</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain">myEmitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">emit</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'event'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// Prints:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// A</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// B</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// callbackB is now removed.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// Internal listener array [callbackA]</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain">myEmitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">emit</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'event'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// Prints:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// A</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Because listeners are managed using an internal array, calling this will
|
||
change the position indices of any listener registered <em>after</em> the listener
|
||
being removed. This will not impact the order in which listeners are called,
|
||
but it means that any copies of the listener array as returned by
|
||
the <code>emitter.listeners()</code> method will need to be recreated.</p><p>When a single function has been added as a handler multiple times for a single
|
||
event (as in the example below), <code>removeListener()</code> will remove the most
|
||
recently added instance. In the example the <code>once('ping')</code>listener is removed:</p><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#403f53;--prism-background-color:#FBFBFB"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-js codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#403f53"><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> ee </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">new</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(17, 17, 17)">EventEmitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token keyword" style="color:rgb(12, 150, 155)">function</span><span class="token plain"> </span><span class="token function" style="color:rgb(153, 76, 195);font-style:italic">pong</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token console class-name" style="color:rgb(17, 17, 17)">console</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">log</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'pong'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain">ee</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">on</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'ping'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> pong</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain">ee</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">once</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'ping'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> pong</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain">ee</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">removeListener</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'ping'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> pong</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain">ee</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">emit</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'ping'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain">ee</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">emit</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'ping'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Returns a reference to the <code>EventEmitter</code>, so that calls can be chained.</p><p><strong><code>Since</code></strong></p><p>v0.1.26</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="parameters-12">Parameters<a class="hash-link" href="#parameters-12" title="Direct link to heading"></a></h4><table><thead><tr><th align="left">Name</th><th align="left">Type</th></tr></thead><tbody><tr><td align="left"><code>eventName</code></td><td align="left"><code>string</code> <!-- -->|<!-- --> <code>symbol</code></td></tr><tr><td align="left"><code>listener</code></td><td align="left">(...<code>args</code>: <code>any</code>[]) => <code>void</code></td></tr></tbody></table><h4 class="anchor anchorWithStickyNavbar_LWe7" id="returns-13">Returns<a class="hash-link" href="#returns-13" title="Direct link to heading"></a></h4><p><a href="/docs/api/classes/SernEmitter"><code>SernEmitter</code></a></p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="inherited-from-15">Inherited from<a class="hash-link" href="#inherited-from-15" title="Direct link to heading"></a></h4><p>EventEmitter.removeListener</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="defined-in-18">Defined in<a class="hash-link" href="#defined-in-18" title="Direct link to heading"></a></h4><p>node_modules/@types/node/events.d.ts:457</p><hr><h3 class="anchor anchorWithStickyNavbar_LWe7" id="setmaxlisteners">setMaxListeners<a class="hash-link" href="#setmaxlisteners" title="Direct link to heading"></a></h3><p>▸ <strong>setMaxListeners</strong>(<code>n</code>): <a href="/docs/api/classes/SernEmitter"><code>SernEmitter</code></a></p><p>By default <code>EventEmitter</code>s will print a warning if more than <code>10</code> listeners are
|
||
added for a particular event. This is a useful default that helps finding
|
||
memory leaks. The <code>emitter.setMaxListeners()</code> method allows the limit to be
|
||
modified 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><p>Returns a reference to the <code>EventEmitter</code>, so that calls can be chained.</p><p><strong><code>Since</code></strong></p><p>v0.3.5</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="parameters-13">Parameters<a class="hash-link" href="#parameters-13" title="Direct link to heading"></a></h4><table><thead><tr><th align="left">Name</th><th align="left">Type</th></tr></thead><tbody><tr><td align="left"><code>n</code></td><td align="left"><code>number</code></td></tr></tbody></table><h4 class="anchor anchorWithStickyNavbar_LWe7" id="returns-14">Returns<a class="hash-link" href="#returns-14" title="Direct link to heading"></a></h4><p><a href="/docs/api/classes/SernEmitter"><code>SernEmitter</code></a></p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="inherited-from-16">Inherited from<a class="hash-link" href="#inherited-from-16" title="Direct link to heading"></a></h4><p>EventEmitter.setMaxListeners</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="defined-in-19">Defined in<a class="hash-link" href="#defined-in-19" title="Direct link to heading"></a></h4><p>node_modules/@types/node/events.d.ts:483</p><hr><h3 class="anchor anchorWithStickyNavbar_LWe7" id="geteventlisteners">getEventListeners<a class="hash-link" href="#geteventlisteners" title="Direct link to heading"></a></h3><p>▸ <code>Static</code> <strong>getEventListeners</strong>(<code>emitter</code>, <code>name</code>): <code>Function</code>[]</p><p>Returns a copy of the array of listeners for the event named <code>eventName</code>.</p><p>For <code>EventEmitter</code>s this behaves exactly the same as calling <code>.listeners</code> on
|
||
the emitter.</p><p>For <code>EventTarget</code>s this is the only way to get the event listeners for the
|
||
event target. This is useful for debugging and diagnostic purposes.</p><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#403f53;--prism-background-color:#FBFBFB"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-js codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#403f53"><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"> getEventListeners</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token maybe-class-name">EventEmitter</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token plain"> </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token function" style="color:rgb(153, 76, 195);font-style:italic">require</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'events'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> ee </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">new</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(17, 17, 17)">EventEmitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> </span><span class="token function-variable function" style="color:rgb(153, 76, 195);font-style:italic">listener</span><span class="token plain"> </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:rgb(12, 150, 155)">=></span><span class="token plain"> </span><span class="token console class-name" style="color:rgb(17, 17, 17)">console</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">log</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'Events are fun'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> ee</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">on</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'foo'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> listener</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token function" style="color:rgb(153, 76, 195);font-style:italic">getEventListeners</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token plain">ee</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token string" style="color:rgb(72, 118, 214)">'foo'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"> </span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// [listener]</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> et </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">new</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(17, 17, 17)">EventTarget</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> </span><span class="token function-variable function" style="color:rgb(153, 76, 195);font-style:italic">listener</span><span class="token plain"> </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:rgb(12, 150, 155)">=></span><span class="token plain"> </span><span class="token console class-name" style="color:rgb(17, 17, 17)">console</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">log</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'Events are fun'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> et</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">addEventListener</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'foo'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> listener</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token function" style="color:rgb(153, 76, 195);font-style:italic">getEventListeners</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token plain">et</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token string" style="color:rgb(72, 118, 214)">'foo'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"> </span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// [listener]</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p><strong><code>Since</code></strong></p><p>v15.2.0, v14.17.0</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="parameters-14">Parameters<a class="hash-link" href="#parameters-14" title="Direct link to heading"></a></h4><table><thead><tr><th align="left">Name</th><th align="left">Type</th></tr></thead><tbody><tr><td align="left"><code>emitter</code></td><td align="left"><code>EventEmitter</code> <!-- -->|<!-- --> <code>DOMEventTarget</code></td></tr><tr><td align="left"><code>name</code></td><td align="left"><code>string</code> <!-- -->|<!-- --> <code>symbol</code></td></tr></tbody></table><h4 class="anchor anchorWithStickyNavbar_LWe7" id="returns-15">Returns<a class="hash-link" href="#returns-15" title="Direct link to heading"></a></h4><p><code>Function</code>[]</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="inherited-from-17">Inherited from<a class="hash-link" href="#inherited-from-17" title="Direct link to heading"></a></h4><p>EventEmitter.getEventListeners</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="defined-in-20">Defined in<a class="hash-link" href="#defined-in-20" title="Direct link to heading"></a></h4><p>node_modules/@types/node/events.d.ts:262</p><hr><h3 class="anchor anchorWithStickyNavbar_LWe7" id="listenercount-1">listenerCount<a class="hash-link" href="#listenercount-1" title="Direct link to heading"></a></h3><p>▸ <code>Static</code> <strong>listenerCount</strong>(<code>emitter</code>, <code>eventName</code>): <code>number</code></p><p>A class method that returns the number of listeners for the given <code>eventName</code>registered on the given <code>emitter</code>.</p><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#403f53;--prism-background-color:#FBFBFB"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-js codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#403f53"><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"> </span><span class="token maybe-class-name">EventEmitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> listenerCount </span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token plain"> </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token function" style="color:rgb(153, 76, 195);font-style:italic">require</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'events'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> myEmitter </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">new</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(17, 17, 17)">EventEmitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain">myEmitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">on</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'event'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:rgb(12, 150, 155)">=></span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain">myEmitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">on</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'event'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:rgb(12, 150, 155)">=></span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token console class-name" style="color:rgb(17, 17, 17)">console</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">log</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token function" style="color:rgb(153, 76, 195);font-style:italic">listenerCount</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token plain">myEmitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token string" style="color:rgb(72, 118, 214)">'event'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// Prints: 2</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p><strong><code>Since</code></strong></p><p>v0.9.12</p><p><strong><code>Deprecated</code></strong></p><p>Since v3.2.0 - Use <code>listenerCount</code> instead.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="parameters-15">Parameters<a class="hash-link" href="#parameters-15" title="Direct link to heading"></a></h4><table><thead><tr><th align="left">Name</th><th align="left">Type</th><th align="left">Description</th></tr></thead><tbody><tr><td align="left"><code>emitter</code></td><td align="left"><code>EventEmitter</code></td><td align="left">The emitter to query</td></tr><tr><td align="left"><code>eventName</code></td><td align="left"><code>string</code> <!-- -->|<!-- --> <code>symbol</code></td><td align="left">The event name</td></tr></tbody></table><h4 class="anchor anchorWithStickyNavbar_LWe7" id="returns-16">Returns<a class="hash-link" href="#returns-16" title="Direct link to heading"></a></h4><p><code>number</code></p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="inherited-from-18">Inherited from<a class="hash-link" href="#inherited-from-18" title="Direct link to heading"></a></h4><p>EventEmitter.listenerCount</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="defined-in-21">Defined in<a class="hash-link" href="#defined-in-21" title="Direct link to heading"></a></h4><p>node_modules/@types/node/events.d.ts:234</p><hr><h3 class="anchor anchorWithStickyNavbar_LWe7" id="on-1">on<a class="hash-link" href="#on-1" title="Direct link to heading"></a></h3><p>▸ <code>Static</code> <strong>on</strong>(<code>emitter</code>, <code>eventName</code>, <code>options?</code>): <code>AsyncIterableIterator</code><<code>any</code>></p><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#403f53;--prism-background-color:#FBFBFB"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-js codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#403f53"><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"> on</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token maybe-class-name">EventEmitter</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token plain"> </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token function" style="color:rgb(153, 76, 195);font-style:italic">require</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'events'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token keyword" style="color:rgb(12, 150, 155)">async</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:rgb(12, 150, 155)">=></span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> ee </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">new</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(17, 17, 17)">EventEmitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// Emit later on</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> process</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">nextTick</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:rgb(12, 150, 155)">=></span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> ee</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">emit</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'foo'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token string" style="color:rgb(72, 118, 214)">'bar'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> ee</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">emit</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'foo'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token number" style="color:rgb(170, 9, 130)">42</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token keyword control-flow" style="color:rgb(12, 150, 155)">for</span><span class="token plain"> </span><span class="token keyword control-flow" style="color:rgb(12, 150, 155)">await</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> event </span><span class="token keyword" style="color:rgb(12, 150, 155)">of</span><span class="token plain"> </span><span class="token function" style="color:rgb(153, 76, 195);font-style:italic">on</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token plain">ee</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token string" style="color:rgb(72, 118, 214)">'foo'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// The execution of this inner block is synchronous and it</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// processes one event at a time (even with await). Do not use</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// if concurrent execution is required.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token console class-name" style="color:rgb(17, 17, 17)">console</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">log</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token plain">event</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"> </span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// prints ['bar'] [42]</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// Unreachable here</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Returns an <code>AsyncIterator</code> that iterates <code>eventName</code> events. It will throw
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if the <code>EventEmitter</code> emits <code>'error'</code>. It removes all listeners when
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exiting the loop. The <code>value</code> returned by each iteration is an array
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composed of the emitted event arguments.</p><p>An <code>AbortSignal</code> can be used to cancel waiting on events:</p><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#403f53;--prism-background-color:#FBFBFB"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-js codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#403f53"><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"> on</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token maybe-class-name">EventEmitter</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token plain"> </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token function" style="color:rgb(153, 76, 195);font-style:italic">require</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'events'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> ac </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">new</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(17, 17, 17)">AbortController</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token keyword" style="color:rgb(12, 150, 155)">async</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:rgb(12, 150, 155)">=></span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> ee </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">new</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(17, 17, 17)">EventEmitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// Emit later on</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> process</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">nextTick</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:rgb(12, 150, 155)">=></span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> ee</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">emit</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'foo'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token string" style="color:rgb(72, 118, 214)">'bar'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> ee</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">emit</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'foo'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token number" style="color:rgb(170, 9, 130)">42</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token keyword control-flow" style="color:rgb(12, 150, 155)">for</span><span class="token plain"> </span><span class="token keyword control-flow" style="color:rgb(12, 150, 155)">await</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> event </span><span class="token keyword" style="color:rgb(12, 150, 155)">of</span><span class="token plain"> </span><span class="token function" style="color:rgb(153, 76, 195);font-style:italic">on</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token plain">ee</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token string" style="color:rgb(72, 118, 214)">'foo'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"> </span><span class="token literal-property property" style="color:rgb(12, 150, 155)">signal</span><span class="token operator" style="color:rgb(12, 150, 155)">:</span><span class="token plain"> ac</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token property-access">signal</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// The execution of this inner block is synchronous and it</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// processes one event at a time (even with await). Do not use</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// if concurrent execution is required.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token console class-name" style="color:rgb(17, 17, 17)">console</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">log</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token plain">event</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"> </span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// prints ['bar'] [42]</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// Unreachable here</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain">process</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">nextTick</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:rgb(12, 150, 155)">=></span><span class="token plain"> ac</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">abort</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p><strong><code>Since</code></strong></p><p>v13.6.0, v12.16.0</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="parameters-16">Parameters<a class="hash-link" href="#parameters-16" title="Direct link to heading"></a></h4><table><thead><tr><th align="left">Name</th><th align="left">Type</th><th align="left">Description</th></tr></thead><tbody><tr><td align="left"><code>emitter</code></td><td align="left"><code>EventEmitter</code></td><td align="left">-</td></tr><tr><td align="left"><code>eventName</code></td><td align="left"><code>string</code></td><td align="left">The name of the event being listened for</td></tr><tr><td align="left"><code>options?</code></td><td align="left"><code>StaticEventEmitterOptions</code></td><td align="left">-</td></tr></tbody></table><h4 class="anchor anchorWithStickyNavbar_LWe7" id="returns-17">Returns<a class="hash-link" href="#returns-17" title="Direct link to heading"></a></h4><p><code>AsyncIterableIterator</code><<code>any</code>></p><p>that iterates <code>eventName</code> events emitted by the <code>emitter</code></p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="inherited-from-19">Inherited from<a class="hash-link" href="#inherited-from-19" title="Direct link to heading"></a></h4><p>EventEmitter.on</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="defined-in-22">Defined in<a class="hash-link" href="#defined-in-22" title="Direct link to heading"></a></h4><p>node_modules/@types/node/events.d.ts:217</p><p>▸ <code>Static</code> <strong>on</strong><<code>E</code>, <code>K</code>><!-- -->(<code>eventEmitter</code>, <code>eventName</code>): <code>AsyncIterableIterator</code><<code>E</code> extends <code>Client</code><<code>boolean</code>><!-- --> ? <code>ClientEvents</code>[<code>K</code>]<!-- --> : <code>any</code>></p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="type-parameters-3">Type parameters<a class="hash-link" href="#type-parameters-3" title="Direct link to heading"></a></h4><table><thead><tr><th align="left">Name</th><th align="left">Type</th></tr></thead><tbody><tr><td align="left"><code>E</code></td><td align="left">extends <code>__module</code></td></tr><tr><td align="left"><code>K</code></td><td align="left">extends keyof <code>ClientEvents</code></td></tr></tbody></table><h4 class="anchor anchorWithStickyNavbar_LWe7" id="parameters-17">Parameters<a class="hash-link" href="#parameters-17" title="Direct link to heading"></a></h4><table><thead><tr><th align="left">Name</th><th align="left">Type</th></tr></thead><tbody><tr><td align="left"><code>eventEmitter</code></td><td align="left"><code>E</code></td></tr><tr><td align="left"><code>eventName</code></td><td align="left"><code>E</code> extends <code>Client</code><<code>boolean</code>><!-- --> ? <code>K</code> : <code>string</code></td></tr></tbody></table><h4 class="anchor anchorWithStickyNavbar_LWe7" id="returns-18">Returns<a class="hash-link" href="#returns-18" title="Direct link to heading"></a></h4><p><code>AsyncIterableIterator</code><<code>E</code> extends <code>Client</code><<code>boolean</code>><!-- --> ? <code>ClientEvents</code>[<code>K</code>]<!-- --> : <code>any</code>></p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="inherited-from-20">Inherited from<a class="hash-link" href="#inherited-from-20" title="Direct link to heading"></a></h4><p>EventEmitter.on</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="defined-in-23">Defined in<a class="hash-link" href="#defined-in-23" title="Direct link to heading"></a></h4><p>node_modules/discord.js/typings/index.d.ts:222</p><hr><h3 class="anchor anchorWithStickyNavbar_LWe7" id="once-1">once<a class="hash-link" href="#once-1" title="Direct link to heading"></a></h3><p>▸ <code>Static</code> <strong>once</strong>(<code>emitter</code>, <code>eventName</code>, <code>options?</code>): <code>Promise</code><<code>any</code>[]<!-- -->></p><p>Creates a <code>Promise</code> that is fulfilled when the <code>EventEmitter</code> emits the given
|
||
event or that is rejected if the <code>EventEmitter</code> emits <code>'error'</code> while waiting.
|
||
The <code>Promise</code> will resolve with an array of all the arguments emitted to the
|
||
given event.</p><p>This method is intentionally generic and works with the web platform <a href="https://dom.spec.whatwg.org/#interface-eventtarget" target="_blank" rel="noopener noreferrer">EventTarget</a> interface, which has no special<code>'error'</code> event
|
||
semantics and does not listen to the <code>'error'</code> event.</p><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#403f53;--prism-background-color:#FBFBFB"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-js codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#403f53"><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"> once</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token maybe-class-name">EventEmitter</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token plain"> </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token function" style="color:rgb(153, 76, 195);font-style:italic">require</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'events'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token keyword" style="color:rgb(12, 150, 155)">async</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">function</span><span class="token plain"> </span><span class="token function" style="color:rgb(153, 76, 195);font-style:italic">run</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> ee </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">new</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(17, 17, 17)">EventEmitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> process</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">nextTick</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:rgb(12, 150, 155)">=></span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> ee</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">emit</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'myevent'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token number" style="color:rgb(170, 9, 130)">42</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">[</span><span class="token plain">value</span><span class="token punctuation" style="color:rgb(153, 76, 195)">]</span><span class="token plain"> </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token keyword control-flow" style="color:rgb(12, 150, 155)">await</span><span class="token plain"> </span><span class="token function" style="color:rgb(153, 76, 195);font-style:italic">once</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token plain">ee</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token string" style="color:rgb(72, 118, 214)">'myevent'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token console class-name" style="color:rgb(17, 17, 17)">console</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">log</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token plain">value</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> err </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">new</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(17, 17, 17)">Error</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'kaboom'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> process</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">nextTick</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:rgb(12, 150, 155)">=></span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> ee</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">emit</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'error'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> err</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token keyword control-flow" style="color:rgb(12, 150, 155)">try</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token keyword control-flow" style="color:rgb(12, 150, 155)">await</span><span class="token plain"> </span><span class="token function" style="color:rgb(153, 76, 195);font-style:italic">once</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token plain">ee</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token string" style="color:rgb(72, 118, 214)">'myevent'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token plain"> </span><span class="token keyword control-flow" style="color:rgb(12, 150, 155)">catch</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token plain">err</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token console class-name" style="color:rgb(17, 17, 17)">console</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">log</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'error happened'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> err</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token function" style="color:rgb(153, 76, 195);font-style:italic">run</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>The special handling of the <code>'error'</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
|
||
'<code>error'</code> event itself, then it is treated as any other kind of event without
|
||
special handling:</p><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#403f53;--prism-background-color:#FBFBFB"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-js codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#403f53"><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"> </span><span class="token maybe-class-name">EventEmitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> once </span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token plain"> </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token function" style="color:rgb(153, 76, 195);font-style:italic">require</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'events'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> ee </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">new</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(17, 17, 17)">EventEmitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token function" style="color:rgb(153, 76, 195);font-style:italic">once</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token plain">ee</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token string" style="color:rgb(72, 118, 214)">'error'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">then</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token parameter punctuation" style="color:rgb(153, 76, 195)">[</span><span class="token parameter">err</span><span class="token parameter punctuation" style="color:rgb(153, 76, 195)">]</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:rgb(12, 150, 155)">=></span><span class="token plain"> </span><span class="token console class-name" style="color:rgb(17, 17, 17)">console</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">log</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'ok'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> err</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token property-access">message</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token keyword control-flow" style="color:rgb(12, 150, 155)">catch</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token parameter">err</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token arrow operator" style="color:rgb(12, 150, 155)">=></span><span class="token plain"> </span><span class="token console class-name" style="color:rgb(17, 17, 17)">console</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">log</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'error'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> err</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token property-access">message</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain">ee</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">emit</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'error'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">new</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(17, 17, 17)">Error</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'boom'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// Prints: ok boom</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>An <code>AbortSignal</code> can be used to cancel waiting for the event:</p><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#403f53;--prism-background-color:#FBFBFB"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-js codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#403f53"><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"> </span><span class="token maybe-class-name">EventEmitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> once </span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token plain"> </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token function" style="color:rgb(153, 76, 195);font-style:italic">require</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'events'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> ee </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">new</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(17, 17, 17)">EventEmitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> ac </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">new</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(17, 17, 17)">AbortController</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token keyword" style="color:rgb(12, 150, 155)">async</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">function</span><span class="token plain"> </span><span class="token function" style="color:rgb(153, 76, 195);font-style:italic">foo</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token parameter">emitter</span><span class="token parameter punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token parameter"> event</span><span class="token parameter punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token parameter"> signal</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token keyword control-flow" style="color:rgb(12, 150, 155)">try</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token keyword control-flow" style="color:rgb(12, 150, 155)">await</span><span class="token plain"> </span><span class="token function" style="color:rgb(153, 76, 195);font-style:italic">once</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token plain">emitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> event</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"> signal </span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token console class-name" style="color:rgb(17, 17, 17)">console</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">log</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'event emitted!'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token plain"> </span><span class="token keyword control-flow" style="color:rgb(12, 150, 155)">catch</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token plain">error</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token keyword control-flow" style="color:rgb(12, 150, 155)">if</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token plain">error</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token property-access">name</span><span class="token plain"> </span><span class="token operator" style="color:rgb(12, 150, 155)">===</span><span class="token plain"> </span><span class="token string" style="color:rgb(72, 118, 214)">'AbortError'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token console class-name" style="color:rgb(17, 17, 17)">console</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">error</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'Waiting for the event was canceled!'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token plain"> </span><span class="token keyword control-flow" style="color:rgb(12, 150, 155)">else</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token console class-name" style="color:rgb(17, 17, 17)">console</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">error</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'There was an error'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> error</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token property-access">message</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token function" style="color:rgb(153, 76, 195);font-style:italic">foo</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token plain">ee</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> </span><span class="token string" style="color:rgb(72, 118, 214)">'foo'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> ac</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token property-access">signal</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain">ac</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">abort</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"> </span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// Abort waiting for the event</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain">ee</span><span class="token punctuation" style="color:rgb(153, 76, 195)">.</span><span class="token method function property-access" style="color:rgb(153, 76, 195);font-style:italic">emit</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'foo'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"> </span><span class="token comment" style="color:rgb(152, 159, 177);font-style:italic">// Prints: Waiting for the event was canceled!</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p><strong><code>Since</code></strong></p><p>v11.13.0, v10.16.0</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="parameters-18">Parameters<a class="hash-link" href="#parameters-18" title="Direct link to heading"></a></h4><table><thead><tr><th align="left">Name</th><th align="left">Type</th></tr></thead><tbody><tr><td align="left"><code>emitter</code></td><td align="left"><code>NodeEventTarget</code></td></tr><tr><td align="left"><code>eventName</code></td><td align="left"><code>string</code> <!-- -->|<!-- --> <code>symbol</code></td></tr><tr><td align="left"><code>options?</code></td><td align="left"><code>StaticEventEmitterOptions</code></td></tr></tbody></table><h4 class="anchor anchorWithStickyNavbar_LWe7" id="returns-19">Returns<a class="hash-link" href="#returns-19" title="Direct link to heading"></a></h4><p><code>Promise</code><<code>any</code>[]<!-- -->></p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="inherited-from-21">Inherited from<a class="hash-link" href="#inherited-from-21" title="Direct link to heading"></a></h4><p>EventEmitter.once</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="defined-in-24">Defined in<a class="hash-link" href="#defined-in-24" title="Direct link to heading"></a></h4><p>node_modules/@types/node/events.d.ts:157</p><p>▸ <code>Static</code> <strong>once</strong>(<code>emitter</code>, <code>eventName</code>, <code>options?</code>): <code>Promise</code><<code>any</code>[]<!-- -->></p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="parameters-19">Parameters<a class="hash-link" href="#parameters-19" title="Direct link to heading"></a></h4><table><thead><tr><th align="left">Name</th><th align="left">Type</th></tr></thead><tbody><tr><td align="left"><code>emitter</code></td><td align="left"><code>DOMEventTarget</code></td></tr><tr><td align="left"><code>eventName</code></td><td align="left"><code>string</code></td></tr><tr><td align="left"><code>options?</code></td><td align="left"><code>StaticEventEmitterOptions</code></td></tr></tbody></table><h4 class="anchor anchorWithStickyNavbar_LWe7" id="returns-20">Returns<a class="hash-link" href="#returns-20" title="Direct link to heading"></a></h4><p><code>Promise</code><<code>any</code>[]<!-- -->></p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="inherited-from-22">Inherited from<a class="hash-link" href="#inherited-from-22" title="Direct link to heading"></a></h4><p>EventEmitter.once</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="defined-in-25">Defined in<a class="hash-link" href="#defined-in-25" title="Direct link to heading"></a></h4><p>node_modules/@types/node/events.d.ts:158</p><p>▸ <code>Static</code> <strong>once</strong><<code>E</code>, <code>K</code>><!-- -->(<code>eventEmitter</code>, <code>eventName</code>): <code>Promise</code><<code>E</code> extends <code>Client</code><<code>boolean</code>><!-- --> ? <code>ClientEvents</code>[<code>K</code>]<!-- --> : <code>any</code>[]<!-- -->></p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="type-parameters-4">Type parameters<a class="hash-link" href="#type-parameters-4" title="Direct link to heading"></a></h4><table><thead><tr><th align="left">Name</th><th align="left">Type</th></tr></thead><tbody><tr><td align="left"><code>E</code></td><td align="left">extends <code>__module</code></td></tr><tr><td align="left"><code>K</code></td><td align="left">extends keyof <code>ClientEvents</code></td></tr></tbody></table><h4 class="anchor anchorWithStickyNavbar_LWe7" id="parameters-20">Parameters<a class="hash-link" href="#parameters-20" title="Direct link to heading"></a></h4><table><thead><tr><th align="left">Name</th><th align="left">Type</th></tr></thead><tbody><tr><td align="left"><code>eventEmitter</code></td><td align="left"><code>E</code></td></tr><tr><td align="left"><code>eventName</code></td><td align="left"><code>E</code> extends <code>Client</code><<code>boolean</code>><!-- --> ? <code>K</code> : <code>string</code></td></tr></tbody></table><h4 class="anchor anchorWithStickyNavbar_LWe7" id="returns-21">Returns<a class="hash-link" href="#returns-21" title="Direct link to heading"></a></h4><p><code>Promise</code><<code>E</code> extends <code>Client</code><<code>boolean</code>><!-- --> ? <code>ClientEvents</code>[<code>K</code>]<!-- --> : <code>any</code>[]<!-- -->></p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="inherited-from-23">Inherited from<a class="hash-link" href="#inherited-from-23" title="Direct link to heading"></a></h4><p>EventEmitter.once</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="defined-in-26">Defined in<a class="hash-link" href="#defined-in-26" title="Direct link to heading"></a></h4><p>node_modules/discord.js/typings/index.d.ts:218</p><hr><h3 class="anchor anchorWithStickyNavbar_LWe7" id="setmaxlisteners-1">setMaxListeners<a class="hash-link" href="#setmaxlisteners-1" title="Direct link to heading"></a></h3><p>▸ <code>Static</code> <strong>setMaxListeners</strong>(<code>n?</code>, ...<code>eventTargets</code>): <code>void</code></p><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#403f53;--prism-background-color:#FBFBFB"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-js codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#403f53"><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(153, 76, 195)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> setMaxListeners</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"> </span><span class="token maybe-class-name">EventEmitter</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token punctuation" style="color:rgb(153, 76, 195)">}</span><span class="token plain"> </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token function" style="color:rgb(153, 76, 195);font-style:italic">require</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token string" style="color:rgb(72, 118, 214)">'events'</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> target </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">new</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(17, 17, 17)">EventTarget</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token keyword" style="color:rgb(12, 150, 155)">const</span><span class="token plain"> emitter </span><span class="token operator" style="color:rgb(12, 150, 155)">=</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(12, 150, 155)">new</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(17, 17, 17)">EventEmitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#403f53"><span class="token plain"></span><span class="token function" style="color:rgb(153, 76, 195);font-style:italic">setMaxListeners</span><span class="token punctuation" style="color:rgb(153, 76, 195)">(</span><span class="token number" style="color:rgb(170, 9, 130)">5</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> target</span><span class="token punctuation" style="color:rgb(153, 76, 195)">,</span><span class="token plain"> emitter</span><span class="token punctuation" style="color:rgb(153, 76, 195)">)</span><span class="token punctuation" style="color:rgb(153, 76, 195)">;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p><strong><code>Since</code></strong></p><p>v15.4.0</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="parameters-21">Parameters<a class="hash-link" href="#parameters-21" title="Direct link to heading"></a></h4><table><thead><tr><th align="left">Name</th><th align="left">Type</th><th align="left">Description</th></tr></thead><tbody><tr><td align="left"><code>n?</code></td><td align="left"><code>number</code></td><td align="left">A non-negative number. The maximum number of listeners per <code>EventTarget</code> event.</td></tr><tr><td align="left"><code>...eventTargets</code></td><td align="left">(<code>EventEmitter</code> <!-- -->|<!-- --> <code>DOMEventTarget</code>)[]</td><td align="left">-</td></tr></tbody></table><h4 class="anchor anchorWithStickyNavbar_LWe7" id="returns-22">Returns<a class="hash-link" href="#returns-22" title="Direct link to heading"></a></h4><p><code>void</code></p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="inherited-from-24">Inherited from<a class="hash-link" href="#inherited-from-24" title="Direct link to heading"></a></h4><p>EventEmitter.setMaxListeners</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="defined-in-27">Defined in<a class="hash-link" href="#defined-in-27" title="Direct link to heading"></a></h4><p>node_modules/@types/node/events.d.ts:280</p></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages navigation"><a class="pagination-nav__link pagination-nav__link--prev" href="/docs/api/classes/ModuleStore"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">ModuleStore</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/api/interfaces/AutocompleteCommand"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">AutocompleteCommand</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#hierarchy" class="table-of-contents__link toc-highlight">Hierarchy</a></li><li><a href="#constructors" class="table-of-contents__link toc-highlight">Constructors</a><ul><li><a href="#constructor" class="table-of-contents__link toc-highlight">constructor</a></li></ul></li><li><a href="#properties" class="table-of-contents__link toc-highlight">Properties</a><ul><li><a href="#capturerejectionsymbol" class="table-of-contents__link toc-highlight">captureRejectionSymbol</a></li><li><a href="#capturerejections" class="table-of-contents__link toc-highlight">captureRejections</a></li><li><a href="#defaultmaxlisteners" class="table-of-contents__link toc-highlight">defaultMaxListeners</a></li><li><a href="#errormonitor" class="table-of-contents__link toc-highlight">errorMonitor</a></li></ul></li><li><a href="#methods" class="table-of-contents__link toc-highlight">Methods</a><ul><li><a href="#addlistener" class="table-of-contents__link toc-highlight">addListener</a></li><li><a href="#emit" class="table-of-contents__link toc-highlight">emit</a></li><li><a href="#eventnames" class="table-of-contents__link toc-highlight">eventNames</a></li><li><a href="#getmaxlisteners" class="table-of-contents__link toc-highlight">getMaxListeners</a></li><li><a href="#listenercount" class="table-of-contents__link toc-highlight">listenerCount</a></li><li><a href="#listeners" class="table-of-contents__link toc-highlight">listeners</a></li><li><a href="#off" class="table-of-contents__link toc-highlight">off</a></li><li><a href="#on" class="table-of-contents__link toc-highlight">on</a></li><li><a href="#once" class="table-of-contents__link toc-highlight">once</a></li><li><a href="#prependlistener" class="table-of-contents__link toc-highlight">prependListener</a></li><li><a href="#prependoncelistener" class="table-of-contents__link toc-highlight">prependOnceListener</a></li><li><a href="#rawlisteners" class="table-of-contents__link toc-highlight">rawListeners</a></li><li><a href="#removealllisteners" class="table-of-contents__link toc-highlight">removeAllListeners</a></li><li><a href="#removelistener" class="table-of-contents__link toc-highlight">removeListener</a></li><li><a href="#setmaxlisteners" class="table-of-contents__link toc-highlight">setMaxListeners</a></li><li><a href="#geteventlisteners" class="table-of-contents__link toc-highlight">getEventListeners</a></li><li><a href="#listenercount-1" class="table-of-contents__link toc-highlight">listenerCount</a></li><li><a href="#on-1" class="table-of-contents__link toc-highlight">on</a></li><li><a href="#once-1" class="table-of-contents__link toc-highlight">once</a></li><li><a href="#setmaxlisteners-1" class="table-of-contents__link toc-highlight">setMaxListeners</a></li></ul></li></ul></div></div></div></div></main></div></div><footer class="footer footer--dark"><div class="container container-fluid"><div class="row footer__links"><div class="col footer__col"><div class="footer__title">Information</div><ul class="footer__items clean-list"><li class="footer__item"><a class="footer__link-item" href="/docs/intro">Docs & Guide</a></li></ul></div><div class="col footer__col"><div class="footer__title">Community</div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://stackoverflow.com/questions/tagged/sern-handler" target="_blank" rel="noopener noreferrer" 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