signalk-server
Version:
An implementation of a [Signal K](http://signalk.org) server for boats.
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<!DOCTYPE html><html class="default" lang="en" data-base="../../"><head><meta charset="utf-8"/><meta http-equiv="x-ua-compatible" content="IE=edge"/><title>FullSignalK | Signal K</title><meta name="description" content="Documentation for Signal K"/><meta name="viewport" content="width=device-width, initial-scale=1"/><link rel="stylesheet" href="../../assets/style.css?cache=1783009712609"/><link rel="stylesheet" href="../../assets/highlight.css?cache=1783009712609"/><script defer src="../../assets/main.js?cache=1783009712609"></script><script async src="../../assets/icons.js?cache=1783009712609" id="tsd-icons-script"></script><script async src="../../assets/search.js?cache=1783009712609" id="tsd-search-script"></script><script async src="../../assets/navigation.js?cache=1783009712609" id="tsd-nav-script"></script><script async src="../../assets/hierarchy.js?cache=1783009712609" id="tsd-hierarchy-script"></script><link rel="stylesheet" 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8zM97.2 352.9c-1.3 1-1 3.3 .7 5.2 1.6 1.6 3.9 2.3 5.2 1 1.3-1 1-3.3-.7-5.2-1.6-1.6-3.9-2.3-5.2-1zm-10.8-8.1c-.7 1.3 .3 2.9 2.3 3.9 1.6 1 3.6 .7 4.3-.7 .7-1.3-.3-2.9-2.3-3.9-2-.6-3.6-.3-4.3 .7zm32.4 35.6c-1.6 1.3-1 4.3 1.3 6.2 2.3 2.3 5.2 2.6 6.5 1 1.3-1.3 .7-4.3-1.3-6.2-2.2-2.3-5.2-2.6-6.5-1zm-11.4-14.7c-1.6 1-1.6 3.6 0 5.9 1.6 2.3 4.3 3.3 5.6 2.3 1.6-1.3 1.6-3.9 0-6.2-1.4-2.3-4-3.3-5.6-2z"></path></svg></a><a href="#" class="tsd-widget menu" id="tsd-toolbar-menu-trigger" data-toggle="menu" aria-label="Menu"><svg width="16" height="16" viewBox="0 0 16 16" fill="none" aria-hidden="true"><use href="../../assets/icons.svg#icon-menu"></use></svg></a></div></div></header><div class="container container-main"><div class="col-content"><div class="tsd-page-title"><ul class="tsd-breadcrumb" aria-label="Breadcrumb"><li><a href="../server-api.html">@signalk/server-api</a></li><li><a href="" aria-current="page">FullSignalK</a></li></ul><h1>Class FullSignalK</h1></div><section class="tsd-panel tsd-hierarchy" data-refl="1965"><h4>Hierarchy</h4><ul class="tsd-hierarchy"><li class="tsd-hierarchy-item"><span class="tsd-signature-type">EventEmitter</span><ul class="tsd-hierarchy"><li class="tsd-hierarchy-item"><span class="tsd-hierarchy-target">FullSignalK</span></li></ul></li></ul></section><aside class="tsd-sources"><ul><li>Defined in <a href="https://github.com/SignalK/signalk-server/blob/67249e0e0fdcf7f9b0298bfada4cec32ea581a38/packages/server-api/src/fullsignalk.ts#L351">packages/server-api/src/fullsignalk.ts:351</a></li></ul></aside><section class="tsd-panel-group tsd-index-group"><section class="tsd-panel tsd-index-panel"><details class="tsd-index-content tsd-accordion" open><summary class="tsd-accordion-summary tsd-index-summary"><svg width="20" height="20" viewBox="0 0 24 24" fill="none" aria-hidden="true"><use href="../../assets/icons.svg#icon-chevronDown"></use></svg><h5 class="tsd-index-heading uppercase">Index</h5></summary><div class="tsd-accordion-details"><section class="tsd-index-section"><h3 class="tsd-index-heading">Constructors</h3><div class="tsd-index-list"><a href="#constructor" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Constructor"><use href="../../assets/icons.svg#icon-512"></use></svg><span>constructor</span></a>
</div></section><section class="tsd-index-section"><h3 class="tsd-index-heading">Properties</h3><div class="tsd-index-list"><a href="#lastmodifieds" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Property"><use href="../../assets/icons.svg#icon-1024"></use></svg><span>last<wbr/>Modifieds</span></a>
<a href="#root" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Property"><use href="../../assets/icons.svg#icon-1024"></use></svg><span>root</span></a>
<a href="#self" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Property"><use href="../../assets/icons.svg#icon-1024"></use></svg><span>self</span></a>
<a href="#sourcemeta" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Property"><use href="../../assets/icons.svg#icon-1024"></use></svg><span>source<wbr/>Meta</span></a>
<a href="#sources" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Property"><use href="../../assets/icons.svg#icon-1024"></use></svg><span>sources</span></a>
</div></section><section class="tsd-index-section"><h3 class="tsd-index-heading">Methods</h3><div class="tsd-index-list"><a href="#adddelta" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>add<wbr/>Delta</span></a>
<a href="#addlistener" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>add<wbr/>Listener</span></a>
<a href="#deletecontext" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>delete<wbr/>Context</span></a>
<a href="#emit" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>emit</span></a>
<a href="#eventnames" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>event<wbr/>Names</span></a>
<a href="#getmaxlisteners" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>get<wbr/>Max<wbr/>Listeners</span></a>
<a href="#listenercount" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>listener<wbr/>Count</span></a>
<a href="#listeners" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>listeners</span></a>
<a href="#off" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>off</span></a>
<a href="#on" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>on</span></a>
<a href="#once" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>once</span></a>
<a href="#prependlistener" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>prepend<wbr/>Listener</span></a>
<a href="#prependoncelistener" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>prepend<wbr/>Once<wbr/>Listener</span></a>
<a href="#prunecontexts" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>prune<wbr/>Contexts</span></a>
<a href="#rawlisteners" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>raw<wbr/>Listeners</span></a>
<a href="#removealllisteners" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>remove<wbr/>All<wbr/>Listeners</span></a>
<a href="#removelistener" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>remove<wbr/>Listener</span></a>
<a href="#retrieve" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>retrieve</span></a>
<a href="#setmaxlisteners" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>set<wbr/>Max<wbr/>Listeners</span></a>
<a href="#updatelastmodified" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>update<wbr/>Last<wbr/>Modified</span></a>
<a href="#capturerejectionsymbol" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>[capture<wbr/>Rejection<wbr/>Symbol]?</span></a>
</div></section></div></details></section></section><details class="tsd-panel-group tsd-member-group tsd-accordion" open><summary class="tsd-accordion-summary" data-key="section-Constructors"><svg width="20" height="20" viewBox="0 0 24 24" fill="none" aria-hidden="true"><use href="../../assets/icons.svg#icon-chevronDown"></use></svg><h2>Constructors</h2></summary><section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="constructor"><span>constructor</span><a href="#constructor" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class=""><div class="tsd-signature tsd-anchor-link" id="constructorfullsignalk"><span class="tsd-signature-keyword">new</span> <span class="tsd-kind-constructor-signature">FullSignalK</span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">id</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">,</span> <span class="tsd-kind-parameter">_type</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">,</span> <span class="tsd-kind-parameter">defaults</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">:</span> <a href="" class="tsd-signature-type tsd-kind-class">FullSignalK</a><a href="#constructorfullsignalk" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></div><div class="tsd-description"><div class="tsd-parameters"><h4 class="tsd-parameters-title">Parameters</h4><ul class="tsd-parameter-list"><li><span><code class="tsd-tag">Optional</code><span class="tsd-kind-parameter">id</span>: <span class="tsd-signature-type">string</span></span></li><li><span><code class="tsd-tag">Optional</code><span class="tsd-kind-parameter">_type</span>: <span class="tsd-signature-type">string</span></span></li><li><span><code class="tsd-tag">Optional</code><span class="tsd-kind-parameter">defaults</span>: <span class="tsd-signature-type">any</span></span></li></ul></div><h4 class="tsd-returns-title">Returns <a href="" class="tsd-signature-type tsd-kind-class">FullSignalK</a></h4><aside class="tsd-sources"><p>Overrides EventEmitter.constructor</p><ul><li>Defined in <a href="https://github.com/SignalK/signalk-server/blob/67249e0e0fdcf7f9b0298bfada4cec32ea581a38/packages/server-api/src/fullsignalk.ts#L371">packages/server-api/src/fullsignalk.ts:371</a></li></ul></aside></div></li></ul></section></section></details><details class="tsd-panel-group tsd-member-group tsd-accordion" open><summary class="tsd-accordion-summary" data-key="section-Properties"><svg width="20" height="20" viewBox="0 0 24 24" fill="none" aria-hidden="true"><use href="../../assets/icons.svg#icon-chevronDown"></use></svg><h2>Properties</h2></summary><section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="lastmodifieds"><span>last<wbr/>Modifieds</span><a href="#lastmodifieds" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h3><div class="tsd-signature"><span class="tsd-kind-property">lastModifieds</span><span class="tsd-signature-symbol">:</span> <a href="https://www.typescriptlang.org/docs/handbook/utility-types.html#recordkeys-type" class="tsd-signature-type external" target="_blank">Record</a><span class="tsd-signature-symbol"><</span><span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">,</span> <span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">></span></div><aside class="tsd-sources"><ul><li>Defined in <a href="https://github.com/SignalK/signalk-server/blob/67249e0e0fdcf7f9b0298bfada4cec32ea581a38/packages/server-api/src/fullsignalk.ts#L358">packages/server-api/src/fullsignalk.ts:358</a></li></ul></aside></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="root"><span>root</span><a href="#root" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h3><div class="tsd-signature"><span class="tsd-kind-property">root</span><span class="tsd-signature-symbol">:</span> <a href="https://www.typescriptlang.org/docs/handbook/utility-types.html#recordkeys-type" class="tsd-signature-type external" target="_blank">Record</a><span class="tsd-signature-symbol"><</span><span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">,</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">></span></div><aside class="tsd-sources"><ul><li>Defined in <a href="https://github.com/SignalK/signalk-server/blob/67249e0e0fdcf7f9b0298bfada4cec32ea581a38/packages/server-api/src/fullsignalk.ts#L353">packages/server-api/src/fullsignalk.ts:353</a></li></ul></aside></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="self"><span>self</span><a href="#self" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h3><div class="tsd-signature"><span class="tsd-kind-property">self</span><span class="tsd-signature-symbol">:</span> <a href="https://www.typescriptlang.org/docs/handbook/utility-types.html#recordkeys-type" class="tsd-signature-type external" target="_blank">Record</a><span class="tsd-signature-symbol"><</span><span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">,</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">></span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">undefined</span></div><aside class="tsd-sources"><ul><li>Defined in <a href="https://github.com/SignalK/signalk-server/blob/67249e0e0fdcf7f9b0298bfada4cec32ea581a38/packages/server-api/src/fullsignalk.ts#L355">packages/server-api/src/fullsignalk.ts:355</a></li></ul></aside></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="sourcemeta"><span>source<wbr/>Meta</span><a href="#sourcemeta" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h3><div class="tsd-signature"><span class="tsd-kind-property">sourceMeta</span><span class="tsd-signature-symbol">:</span> <a href="https://www.typescriptlang.org/docs/handbook/utility-types.html#recordkeys-type" class="tsd-signature-type external" target="_blank">Record</a><span class="tsd-signature-symbol"><</span><span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">,</span> <a href="SourceMetaEntry.html" class="tsd-signature-type tsd-kind-interface">SourceMetaEntry</a><span class="tsd-signature-symbol">></span></div><div class="tsd-comment tsd-typography"><p>Per-source freshness data. Kept off the <code>sources</code> tree so that
<code>retrieve()</code> continues to satisfy the Signal K spec schema
(which bans unknown properties under <code>sources.*.*.n2k</code>).</p>
<p>Key format: <code>${source.label}.${source.src}</code> for N2K,
<code>${source.label}.${source.talker || 'XX'}</code> for NMEA 0183, and
<code>${source.label}</code> for other sources.</p>
</div><aside class="tsd-sources"><ul><li>Defined in <a href="https://github.com/SignalK/signalk-server/blob/67249e0e0fdcf7f9b0298bfada4cec32ea581a38/packages/server-api/src/fullsignalk.ts#L368">packages/server-api/src/fullsignalk.ts:368</a></li></ul></aside></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="sources"><span>sources</span><a href="#sources" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h3><div class="tsd-signature"><span class="tsd-kind-property">sources</span><span class="tsd-signature-symbol">:</span> <a href="https://www.typescriptlang.org/docs/handbook/utility-types.html#recordkeys-type" class="tsd-signature-type external" target="_blank">Record</a><span class="tsd-signature-symbol"><</span><span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">,</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">></span></div><aside class="tsd-sources"><ul><li>Defined in <a href="https://github.com/SignalK/signalk-server/blob/67249e0e0fdcf7f9b0298bfada4cec32ea581a38/packages/server-api/src/fullsignalk.ts#L357">packages/server-api/src/fullsignalk.ts:357</a></li></ul></aside></section></section></details><details class="tsd-panel-group tsd-member-group tsd-accordion" open><summary class="tsd-accordion-summary" data-key="section-Methods"><svg width="20" height="20" viewBox="0 0 24 24" fill="none" aria-hidden="true"><use href="../../assets/icons.svg#icon-chevronDown"></use></svg><h2>Methods</h2></summary><section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="adddelta"><span>add<wbr/>Delta</span><a href="#adddelta" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class=""><div class="tsd-signature tsd-anchor-link" id="adddelta-1"><span class="tsd-kind-call-signature">addDelta</span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">delta</span><span class="tsd-signature-symbol">:</span> <a href="https://www.typescriptlang.org/docs/handbook/utility-types.html#recordkeys-type" class="tsd-signature-type external" target="_blank">Record</a><span class="tsd-signature-symbol"><</span><span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">,</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">></span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">void</span><a href="#adddelta-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></div><div class="tsd-description"><div class="tsd-parameters"><h4 class="tsd-parameters-title">Parameters</h4><ul class="tsd-parameter-list"><li><span><span class="tsd-kind-parameter">delta</span>: <a href="https://www.typescriptlang.org/docs/handbook/utility-types.html#recordkeys-type" class="tsd-signature-type external" target="_blank">Record</a><span class="tsd-signature-symbol"><</span><span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">,</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">></span></span></li></ul></div><h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">void</span></h4><aside class="tsd-sources"><ul><li>Defined in <a href="https://github.com/SignalK/signalk-server/blob/67249e0e0fdcf7f9b0298bfada4cec32ea581a38/packages/server-api/src/fullsignalk.ts#L398">packages/server-api/src/fullsignalk.ts:398</a></li></ul></aside></div></li></ul></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="addlistener"><span>add<wbr/>Listener</span><a href="#addlistener" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class=""><div class="tsd-signature tsd-anchor-link" id="addlistener-1"><span class="tsd-kind-call-signature">addListener</span><span class="tsd-signature-symbol"><</span><a class="tsd-signature-type tsd-kind-type-parameter" href="#addlistenere">E</a> <span class="tsd-signature-keyword">extends</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span><span class="tsd-signature-symbol">></span><span class="tsd-signature-symbol">(</span><br/> <span class="tsd-kind-parameter">eventName</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span><span class="tsd-signature-symbol">,</span><br/> <span class="tsd-kind-parameter">listener</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span><span class="tsd-signature-symbol">)</span> <span class="tsd-signature-symbol">=></span> <span class="tsd-signature-type">void</span><span class="tsd-signature-symbol">,</span><br/><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">this</span><a href="#addlistener-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></div><div class="tsd-description"><div class="tsd-comment tsd-typography"><p>Alias for <code>emitter.on(eventName, listener)</code>.</p>
</div><section class="tsd-panel"><h4>Type Parameters</h4><ul class="tsd-type-parameter-list"><li><span id="addlistenere"><span class="tsd-kind-type-parameter">E</span> <span class="tsd-signature-keyword">extends</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span></span></li></ul></section><div class="tsd-parameters"><h4 class="tsd-parameters-title">Parameters</h4><ul class="tsd-parameter-list"><li><span><span class="tsd-kind-parameter">eventName</span>: <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span></span></li><li><span><span class="tsd-kind-parameter">listener</span>: <span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span><span class="tsd-signature-symbol">)</span> <span class="tsd-signature-symbol">=></span> <span class="tsd-signature-type">void</span></span></li></ul></div><h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">this</span></h4><div class="tsd-comment tsd-typography"><div class="tsd-tag-since"><h4 class="tsd-anchor-link" id="since">Since<a href="#since" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h4><p>v0.1.26</p>
</div></div><aside class="tsd-sources"><p>Inherited from EventEmitter.addListener</p><ul><li>Defined in node_modules/@types/node/events.d.ts:92</li></ul></aside></div></li></ul></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="deletecontext"><span>delete<wbr/>Context</span><a href="#deletecontext" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class=""><div class="tsd-signature tsd-anchor-link" id="deletecontext-1"><span class="tsd-kind-call-signature">deleteContext</span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">contextKey</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">void</span><a href="#deletecontext-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></div><div class="tsd-description"><div class="tsd-parameters"><h4 class="tsd-parameters-title">Parameters</h4><ul class="tsd-parameter-list"><li><span><span class="tsd-kind-parameter">contextKey</span>: <span class="tsd-signature-type">string</span></span></li></ul></div><h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">void</span></h4><aside class="tsd-sources"><ul><li>Defined in <a href="https://github.com/SignalK/signalk-server/blob/67249e0e0fdcf7f9b0298bfada4cec32ea581a38/packages/server-api/src/fullsignalk.ts#L442">packages/server-api/src/fullsignalk.ts:442</a></li></ul></aside></div></li></ul></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="emit"><span>emit</span><a href="#emit" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class=""><div class="tsd-signature tsd-anchor-link" id="emit-1"><span class="tsd-kind-call-signature">emit</span><span class="tsd-signature-symbol"><</span><a class="tsd-signature-type tsd-kind-type-parameter" href="#emite">E</a> <span class="tsd-signature-keyword">extends</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span><span class="tsd-signature-symbol">></span><span class="tsd-signature-symbol">(</span><br/> <span class="tsd-kind-parameter">eventName</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span><span class="tsd-signature-symbol">,</span><br/> <span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span><span class="tsd-signature-symbol">,</span><br/><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">boolean</span><a href="#emit-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></div><div class="tsd-description"><div class="tsd-comment tsd-typography"><p>Synchronously calls each of the listeners registered for the event named
<code>eventName</code>, in the order they were registered, passing the supplied arguments
to each.</p>
<p>Returns <code>true</code> if the event had listeners, <code>false</code> otherwise.</p>
<pre><code class="js"><span class="hl-1">import</span><span class="hl-0"> { EventEmitter } </span><span class="hl-1">from</span><span class="hl-0"> </span><span class="hl-4">'node:events'</span><span class="hl-0">;</span><br/><span class="hl-1">const</span><span class="hl-0"> </span><span class="hl-2">myEmitter</span><span class="hl-0"> </span><span class="hl-1">=</span><span class="hl-0"> </span><span class="hl-1">new</span><span class="hl-0"> </span><span class="hl-7">EventEmitter</span><span class="hl-0">();</span><br/><br/><span class="hl-6">// First listener</span><br/><span class="hl-0">myEmitter.</span><span class="hl-7">on</span><span class="hl-0">(</span><span class="hl-4">'event'</span><span class="hl-0">, </span><span class="hl-1">function</span><span class="hl-0"> </span><span class="hl-7">firstListener</span><span class="hl-0">() {</span><br/><span class="hl-0"> console.</span><span class="hl-7">log</span><span class="hl-0">(</span><span class="hl-4">'Helloooo! first listener'</span><span class="hl-0">);</span><br/><span class="hl-0">});</span><br/><span class="hl-6">// Second listener</span><br/><span class="hl-0">myEmitter.</span><span class="hl-7">on</span><span class="hl-0">(</span><span class="hl-4">'event'</span><span class="hl-0">, </span><span class="hl-1">function</span><span class="hl-0"> </span><span class="hl-7">secondListener</span><span class="hl-0">(</span><span class="hl-5">arg1</span><span class="hl-0">, </span><span class="hl-5">arg2</span><span class="hl-0">) {</span><br/><span class="hl-0"> console.</span><span class="hl-7">log</span><span class="hl-0">(</span><span class="hl-4">`event with parameters ${</span><span class="hl-0">arg1</span><span class="hl-4">}, ${</span><span class="hl-0">arg2</span><span class="hl-4">} in second listener`</span><span class="hl-0">);</span><br/><span class="hl-0">});</span><br/><span class="hl-6">// Third listener</span><br/><span class="hl-0">myEmitter.</span><span class="hl-7">on</span><span class="hl-0">(</span><span class="hl-4">'event'</span><span class="hl-0">, </span><span class="hl-1">function</span><span class="hl-0"> </span><span class="hl-7">thirdListener</span><span class="hl-0">(</span><span class="hl-1">...</span><span class="hl-5">args</span><span class="hl-0">) {</span><br/><span class="hl-0"> </span><span class="hl-1">const</span><span class="hl-0"> </span><span class="hl-2">parameters</span><span class="hl-0"> </span><span class="hl-1">=</span><span class="hl-0"> args.</span><span class="hl-7">join</span><span class="hl-0">(</span><span class="hl-4">', '</span><span class="hl-0">);</span><br/><span class="hl-0"> console.</span><span class="hl-7">log</span><span class="hl-0">(</span><span class="hl-4">`event with parameters ${</span><span class="hl-0">parameters</span><span class="hl-4">} in third listener`</span><span class="hl-0">);</span><br/><span class="hl-0">});</span><br/><br/><span class="hl-0">console.</span><span class="hl-7">log</span><span class="hl-0">(myEmitter.</span><span class="hl-7">listeners</span><span class="hl-0">(</span><span class="hl-4">'event'</span><span class="hl-0">));</span><br/><br/><span class="hl-0">myEmitter.</span><span class="hl-7">emit</span><span class="hl-0">(</span><span class="hl-4">'event'</span><span class="hl-0">, </span><span class="hl-2">1</span><span class="hl-0">, </span><span class="hl-2">2</span><span class="hl-0">, </span><span class="hl-2">3</span><span class="hl-0">, </span><span class="hl-2">4</span><span class="hl-0">, </span><span class="hl-2">5</span><span class="hl-0">);</span><br/><br/><span class="hl-6">// Prints:</span><br/><span class="hl-6">// [</span><br/><span class="hl-6">// [Function: firstListener],</span><br/><span class="hl-6">// [Function: secondListener],</span><br/><span class="hl-6">// [Function: thirdListener]</span><br/><span class="hl-6">// ]</span><br/><span class="hl-6">// Helloooo! first listener</span><br/><span class="hl-6">// event with parameters 1, 2 in second listener</span><br/><span class="hl-6">// event with parameters 1, 2, 3, 4, 5 in third listener</span>
</code><button type="button">Copy</button></pre>
</div><section class="tsd-panel"><h4>Type Parameters</h4><ul class="tsd-type-parameter-list"><li><span id="emite"><span class="tsd-kind-type-parameter">E</span> <span class="tsd-signature-keyword">extends</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span></span></li></ul></section><div class="tsd-parameters"><h4 class="tsd-parameters-title">Parameters</h4><ul class="tsd-parameter-list"><li><span><span class="tsd-kind-parameter">eventName</span>: <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span></span></li><li><span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span>: <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span></span></li></ul></div><h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">boolean</span></h4><div class="tsd-comment tsd-typography"><div class="tsd-tag-since"><h4 class="tsd-anchor-link" id="since-1">Since<a href="#since-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h4><p>v0.1.26</p>
</div></div><aside class="tsd-sources"><p>Inherited from EventEmitter.emit</p><ul><li>Defined in node_modules/@types/node/events.d.ts:134</li></ul></aside></div></li></ul></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="eventnames"><span>event<wbr/>Names</span><a href="#eventnames" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class=""><div class="tsd-signature tsd-anchor-link" id="eventnames-1"><span class="tsd-kind-call-signature">eventNames</span><span class="tsd-signature-symbol">()</span><span class="tsd-signature-symbol">:</span> (<span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span>)<span class="tsd-signature-symbol">[]</span><a href="#eventnames-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></div><div class="tsd-description"><div class="tsd-comment tsd-typography"><p>Returns an array listing the events for which the emitter has registered
listeners.</p>
<pre><code class="js"><span class="hl-1">import</span><span class="hl-0"> { EventEmitter } </span><span class="hl-1">from</span><span class="hl-0"> </span><span class="hl-4">'node:events'</span><span class="hl-0">;</span><br/><br/><span class="hl-1">const</span><span class="hl-0"> </span><span class="hl-2">myEE</span><span class="hl-0"> </span><span class="hl-1">=</span><span class="hl-0"> </span><span class="hl-1">new</span><span class="hl-0"> </span><span class="hl-7">EventEmitter</span><span class="hl-0">();</span><br/><span class="hl-0">myEE.</span><span class="hl-7">on</span><span class="hl-0">(</span><span class="hl-4">'foo'</span><span class="hl-0">, () </span><span class="hl-1">=></span><span class="hl-0"> {});</span><br/><span class="hl-0">myEE.</span><span class="hl-7">on</span><span class="hl-0">(</span><span class="hl-4">'bar'</span><span class="hl-0">, () </span><span class="hl-1">=></span><span class="hl-0"> {});</span><br/><br/><span class="hl-1">const</span><span class="hl-0"> </span><span class="hl-2">sym</span><span class="hl-0"> </span><span class="hl-1">=</span><span class="hl-0"> </span><span class="hl-7">Symbol</span><span class="hl-0">(</span><span class="hl-4">'symbol'</span><span class="hl-0">);</span><br/><span class="hl-0">myEE.</span><span class="hl-7">on</span><span class="hl-0">(sym, () </span><span class="hl-1">=></span><span class="hl-0"> {});</span><br/><br/><span class="hl-0">console.</span><span class="hl-7">log</span><span class="hl-0">(myEE.</span><span class="hl-7">eventNames</span><span class="hl-0">());</span><br/><span class="hl-6">// Prints: [ 'foo', 'bar', Symbol(symbol) ]</span>
</code><button type="button">Copy</button></pre>
</div><h4 class="tsd-returns-title">Returns (<span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span>)<span class="tsd-signature-symbol">[]</span></h4><div class="tsd-comment tsd-typography"><div class="tsd-tag-since"><h4 class="tsd-anchor-link" id="since-2">Since<a href="#since-2" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h4><p>v6.0.0</p>
</div></div><aside class="tsd-sources"><p>Inherited from EventEmitter.eventNames</p><ul><li>Defined in node_modules/@types/node/events.d.ts:154</li></ul></aside></div></li></ul></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="getmaxlisteners"><span>get<wbr/>Max<wbr/>Listeners</span><a href="#getmaxlisteners" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class=""><div class="tsd-signature tsd-anchor-link" id="getmaxlisteners-1"><span class="tsd-kind-call-signature">getMaxListeners</span><span class="tsd-signature-symbol">()</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">number</span><a href="#getmaxlisteners-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></div><div class="tsd-description"><div class="tsd-comment tsd-typography"><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
<code>events.defaultMaxListeners</code>.</p>
</div><h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">number</span></h4><div class="tsd-comment tsd-typography"><div class="tsd-tag-since"><h4 class="tsd-anchor-link" id="since-3">Since<a href="#since-3" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h4><p>v1.0.0</p>
</div></div><aside class="tsd-sources"><p>Inherited from EventEmitter.getMaxListeners</p><ul><li>Defined in node_modules/@types/node/events.d.ts:161</li></ul></aside></div></li></ul></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="listenercount"><span>listener<wbr/>Count</span><a href="#listenercount" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class=""><div class="tsd-signature tsd-anchor-link" id="listenercount-1"><span class="tsd-kind-call-signature">listenerCount</span><span class="tsd-signature-symbol"><</span><a class="tsd-signature-type tsd-kind-type-parameter" href="#listenercounte">E</a> <span class="tsd-signature-keyword">extends</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span><span class="tsd-signature-symbol">></span><span class="tsd-signature-symbol">(</span><br/> <span class="tsd-kind-parameter">eventName</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span><span class="tsd-signature-symbol">,</span><br/> <span class="tsd-kind-parameter">listener</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span><span class="tsd-signature-symbol">)</span> <span class="tsd-signature-symbol">=></span> <span class="tsd-signature-type">void</span><span class="tsd-signature-symbol">,</span><br/><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">number</span><a href="#listenercount-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></div><div class="tsd-description"><div class="tsd-comment tsd-typography"><p>Returns the number of listeners listening for the event named <code>eventName</code>.
If <code>listener</code> is provided, it will return how many times the listener is found
in the list of the listeners of the event.</p>
</div><section class="tsd-panel"><h4>Type Parameters</h4><ul class="tsd-type-parameter-list"><li><span id="listenercounte"><span class="tsd-kind-type-parameter">E</span> <span class="tsd-signature-keyword">extends</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span></span></li></ul></section><div class="tsd-parameters"><h4 class="tsd-parameters-title">Parameters</h4><ul class="tsd-parameter-list"><li><span><span class="tsd-kind-parameter">eventName</span>: <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span></span><div class="tsd-comment tsd-typography"><p>The name of the event being listened for</p>
</div></li><li><span><code class="tsd-tag">Optional</code><span class="tsd-kind-parameter">listener</span>: <span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span><span class="tsd-signature-symbol">)</span> <span class="tsd-signature-symbol">=></span> <span class="tsd-signature-type">void</span></span><div class="tsd-comment tsd-typography"><p>The event handler function</p>
</div></li></ul></div><h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">number</span></h4><div class="tsd-comment tsd-typography"><div class="tsd-tag-since"><h4 class="tsd-anchor-link" id="since-4">Since<a href="#since-4" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h4><p>v3.2.0</p>
</div></div><aside class="tsd-sources"><p>Inherited from EventEmitter.listenerCount</p><ul><li>Defined in node_modules/@types/node/events.d.ts:170</li></ul></aside></div></li></ul></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="listeners"><span>listeners</span><a href="#listeners" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class=""><div class="tsd-signature tsd-anchor-link" id="listeners-1"><span class="tsd-kind-call-signature">listeners</span><span class="tsd-signature-symbol"><</span><a class="tsd-signature-type tsd-kind-type-parameter" href="#listenerse">E</a> <span class="tsd-signature-keyword">extends</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span><span class="tsd-signature-symbol">></span><span class="tsd-signature-symbol">(</span><br/> <span class="tsd-kind-parameter">eventName</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span><span class="tsd-signature-symbol">,</span><br/><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">:</span> (<span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span><span class="tsd-signature-symbol">)</span> <span class="tsd-signature-symbol">=></span> <span class="tsd-signature-type">void</span>)<span class="tsd-signature-symbol">[]</span><a href="#listeners-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></div><div class="tsd-description"><div class="tsd-comment tsd-typography"><p>Returns a copy of the array of listeners for the event named <code>eventName</code>.</p>
<pre><code class="js"><span class="hl-0">server.</span><span class="hl-7">on</span><span class="hl-0">(</span><span class="hl-4">'connection'</span><span class="hl-0">, (</span><span class="hl-5">stream</span><span class="hl-0">) </span><span class="hl-1">=></span><span class="hl-0"> {</span><br/><span class="hl-0"> console.</span><span class="hl-7">log</span><span class="hl-0">(</span><span class="hl-4">'someone connected!'</span><span class="hl-0">);</span><br/><span class="hl-0">});</span><br/><span class="hl-0">console.</span><span class="hl-7">log</span><span class="hl-0">(util.</span><span class="hl-7">inspect</span><span class="hl-0">(server.</span><span class="hl-7">listeners</span><span class="hl-0">(</span><span class="hl-4">'connection'</span><span class="hl-0">)));</span><br/><span class="hl-6">// Prints: [ [Function] ]</span>
</code><button type="button">Copy</button></pre>
</div><section class="tsd-panel"><h4>Type Parameters</h4><ul class="tsd-type-parameter-list"><li><span id="listenerse"><span class="tsd-kind-type-parameter">E</span> <span class="tsd-signature-keyword">extends</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span></span></li></ul></section><div class="tsd-parameters"><h4 class="tsd-parameters-title">Parameters</h4><ul class="tsd-parameter-list"><li><span><span class="tsd-kind-parameter">eventName</span>: <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span></span></li></ul></div><h4 class="tsd-returns-title">Returns (<span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span><span class="tsd-signature-symbol">)</span> <span class="tsd-signature-symbol">=></span> <span class="tsd-signature-type">void</span>)<span class="tsd-signature-symbol">[]</span></h4><div class="tsd-comment tsd-typography"><div class="tsd-tag-since"><h4 class="tsd-anchor-link" id="since-5">Since<a href="#since-5" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h4><p>v0.1.26</p>
</div></div><aside class="tsd-sources"><p>Inherited from EventEmitter.listeners</p><ul><li>Defined in node_modules/@types/node/events.d.ts:186</li></ul></aside></div></li></ul></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="off"><span>off</span><a href="#off" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class=""><div class="tsd-signature tsd-anchor-link" id="off-1"><span class="tsd-kind-call-signature">off</span><span class="tsd-signature-symbol"><</span><a class="tsd-signature-type tsd-kind-type-parameter" href="#offe">E</a> <span class="tsd-signature-keyword">extends</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span><span class="tsd-signature-symbol">></span><span class="tsd-signature-symbol">(</span><br/> <span class="tsd-kind-parameter">eventName</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span><span class="tsd-signature-symbol">,</span><br/> <span class="tsd-kind-parameter">listener</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span><span class="tsd-signature-symbol">)</span> <span class="tsd-signature-symbol">=></span> <span class="tsd-signature-type">void</span><span class="tsd-signature-symbol">,</span><br/><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">this</span><a href="#off-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></div><div class="tsd-description"><div class="tsd-comment tsd-typography"><p>Alias for <code>emitter.removeListener()</code>.</p>
</div><section class="tsd-panel"><h4>Type Parameters</h4><ul class="tsd-type-parameter-list"><li><span id="offe"><span class="tsd-kind-type-parameter">E</span> <span class="tsd-signature-keyword">extends</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span></span></li></ul></section><div class="tsd-parameters"><h4 class="tsd-parameters-title">Parameters</h4><ul class="tsd-parameter-list"><li><span><span class="tsd-kind-parameter">eventName</span>: <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span></span></li><li><span><span class="tsd-kind-parameter">listener</span>: <span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span><span class="tsd-signature-symbol">)</span> <span class="tsd-signature-symbol">=></span> <span class="tsd-signature-type">void</span></span></li></ul></div><h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">this</span></h4><div class="tsd-comment tsd-typography"><div class="tsd-tag-since"><h4 class="tsd-anchor-link" id="since-6">Since<a href="#since-6" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h4><p>v10.0.0</p>
</div></div><aside class="tsd-sources"><p>Inherited from EventEmitter.off</p><ul><li>Defined in node_modules/@types/node/events.d.ts:191</li></ul></aside></div></li></ul></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="on"><span>on</span><a href="#on" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class=""><div class="tsd-signature tsd-anchor-link" id="on-1"><span class="tsd-kind-call-signature">on</span><span class="tsd-signature-symbol"><</span><a class="tsd-signature-type tsd-kind-type-parameter" href="#one">E</a> <span class="tsd-signature-keyword">extends</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span><span class="tsd-signature-symbol">></span><span class="tsd-signature-symbol">(</span><br/> <span class="tsd-kind-parameter">eventName</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span><span class="tsd-signature-symbol">,</span><br/> <span class="tsd-kind-parameter">listener</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span><span class="tsd-signature-symbol">)</span> <span class="tsd-signature-symbol">=></span> <span class="tsd-signature-type">void</span><span class="tsd-signature-symbol">,</span><br/><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">this</span><a href="#on-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></div><div class="tsd-description"><div class="tsd-comment tsd-typography"><p>Adds the <code>listener</code> function to the end of the listeners array for the
event named <code>eventName</code>. No checks are made to see if the <code>listener</code> has
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
times.</p>
<pre><code class="js"><span class="hl-0">server.</span><span class="hl-7">on</span><span class="hl-0">(</span><span class="hl-4">'connection'</span><span class="hl-0">, (</span><span class="hl-5">stream</span><span class="hl-0">) </span><span class="hl-1">=></span><span class="hl-0"> {</span><br/><span class="hl-0"> console.</span><span class="hl-7">log</span><span class="hl-0">(</span><span class="hl-4">'someone connected!'</span><span class="hl-0">);</span><br/><span class="hl-0">});</span>
</code><button type="button">Copy</button></pre>
<p>Returns a reference to the <code>EventEmitter</code>, so that calls can be chained.</p>
<p>By default, event listeners are invoked in the order they are added. The
<code>emitter.prependListener()</code> method can be used as an alternative to add the
event listener to the beginning of the listeners array.</p>
<pre><code class="js"><span class="hl-1">import</span><span class="hl-0"> { EventEmitter } </span><span class="hl-1">from</span><span class="hl-0"> </span><span class="hl-4">'node:events'</span><span class="hl-0">;</span><br/><span class="hl-1">const</span><span class="hl-0"> </span><span class="hl-2">myEE</span><span class="hl-0"> </span><span class="hl-1">=</span><span class="hl-0"> </span><span class="hl-1">new</span><span class="hl-0"> </span><span class="hl-7">EventEmitter</span><span class="hl-0">();</span><br/><span class="hl-0">myEE.</span><span class="hl-7">on</span><span class="hl-0">(</span><span class="hl-4">'foo'</span><span class="hl-0">, () </span><span class="hl-1">=></span><span class="hl-0"> console.</span><span class="hl-7">log</span><span class="hl-0">(</span><span class="hl-4">'a'</span><span class="hl-0">));</span><br/><span class="hl-0">myEE.</span><span class="hl-7">prependListener</span><span class="hl-0">(</span><span class="hl-4">'foo'</span><span class="hl-0">, () </span><span class="hl-1">=></span><span class="hl-0"> console.</span><span class="hl-7">log</span><span class="hl-0">(</span><span class="hl-4">'b'</span><span class="hl-0">));</span><br/><span class="hl-0">myEE.</span><span class="hl-7">emit</span><span class="hl-0">(</span><span class="hl-4">'foo'</span><span class="hl-0">);</span><br/><span class="hl-6">// Prints:</span><br/><span class="hl-6">// b</span><br/><span class="hl-6">// a</span>
</code><button type="button">Copy</button></pre>
</div><section class="tsd-panel"><h4>Type Parameters</h4><ul class="tsd-type-parameter-list"><li><span id="one"><span class="tsd-kind-type-parameter">E</span> <span class="tsd-signature-keyword">extends</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span></span></li></ul></section><div class="tsd-parameters"><h4 class="tsd-parameters-title">Parameters</h4><ul class="tsd-parameter-list"><li><span><span class="tsd-kind-parameter">eventName</span>: <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span></span><div class="tsd-comment tsd-typography"><p>The name of the event.</p>
</div></li><li><span><span class="tsd-kind-parameter">listener</span>: <span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span><span class="tsd-signature-symbol">)</span> <span class="tsd-signature-symbol">=></span> <span class="tsd-signature-type">void</span></span><div class="tsd-comment tsd-typography"><p>The callback function</p>
</div></li></ul></div><h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">this</span></h4><div class="tsd-comment tsd-typography"><div class="tsd-tag-since"><h4 class="tsd-anchor-link" id="since-7">Since<a href="#since-7" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h4><p>v0.1.101</p>
</div></div><aside class="tsd-sources"><p>Inherited from EventEmitter.on</p><ul><li>Defined in node_modules/@types/node/events.d.ts:225</li></ul></aside></div></li></ul></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="once"><span>once</span><a href="#once" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class=""><div class="tsd-signature tsd-anchor-link" id="once-1"><span class="tsd-kind-call-signature">once</span><span class="tsd-signature-symbol"><</span><a class="tsd-signature-type tsd-kind-type-parameter" href="#oncee">E</a> <span class="tsd-signature-keyword">extends</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span><span class="tsd-signature-symbol">></span><span class="tsd-signature-symbol">(</span><br/> <span class="tsd-kind-parameter">eventName</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span><span class="tsd-signature-symbol">,</span><br/> <span class="tsd-kind-parameter">listener</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span><span class="tsd-signature-symbol">)</span> <span class="tsd-signature-symbol">=></span> <span class="tsd-signature-type">void</span><span class="tsd-signature-symbol">,</span><br/><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">this</span><a href="#once-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></div><div class="tsd-description"><div class="tsd-comment tsd-typography"><p>Adds a <strong>one-time</strong> <code>listener</code> function for the event named <code>eventName</code>. The
next time <code>eventName</code> is triggered, this listener is removed and then invoked.</p>
<pre><code class="js"><span class="hl-0">server.</span><span class="hl-7">once</span><span class="hl-0">(</span><span class="hl-4">'connection'</span><span class="hl-0">, (</span><span class="hl-5">stream</span><span class="hl-0">) </span><span class="hl-1">=></span><span class="hl-0"> {</span><br/><span class="hl-0"> console.</span><span class="hl-7">log</span><span class="hl-0">(</span><span class="hl-4">'Ah, we have our first user!'</span><span class="hl-0">);</span><br/><span class="hl-0">});</span>
</code><button type="button">Copy</button></pre>
<p>Returns a reference to the <code>EventEmitter</code>, so that calls can be chained.</p>
<p>By default, event listeners are invoked in the order they are added. The
<code>emitter.prependOnceListener()</code> method can be used as an alternative to add the
event listener to the beginning of the listeners array.</p>
<pre><code class="js"><span class="hl-1">import</span><span class="hl-0"> { EventEmitter } </span><span class="hl-1">from</span><span class="hl-0"> </span><span class="hl-4">'node:events'</span><span class="hl-0">;</span><br/><span class="hl-1">const</span><span class="hl-0"> </span><span class="hl-2">myEE</span><span class="hl-0"> </span><span class="hl-1">=</span><span class="hl-0"> </span><span class="hl-1">new</span><span class="hl-0"> </span><span class="hl-7">EventEmitter</span><span class="hl-0">();</span><br/><span class="hl-0">myEE.</span><span class="hl-7">once</span><span class="hl-0">(</span><span class="hl-4">'foo'</span><span class="hl-0">, () </span><span class="hl-1">=></span><span class="hl-0"> console.</span><span class="hl-7">log</span><span class="hl-0">(</span><span class="hl-4">'a'</span><span class="hl-0">));</span><br/><span class="hl-0">myEE.</span><span class="hl-7">prependOnceListener</span><span class="hl-0">(</span><span class="hl-4">'foo'</span><span class="hl-0">, () </span><span class="hl-1">=></span><span class="hl-0"> console.</span><span class="hl-7">log</span><span class="hl-0">(</span><span class="hl-4">'b'</span><span class="hl-0">));</span><br/><span class="hl-0">myEE.</span><span class="hl-7">emit</span><span class="hl-0">(</span><span class="hl-4">'foo'</span><span class="hl-0">);</span><br/><span class="hl-6">// Prints:</span><br/><span class="hl-6">// b</span><br/><span class="hl-6">// a</span>
</code><button type="button">Copy</button></pre>
</div><section class="tsd-panel"><h4>Type Parameters</h4><ul class="tsd-type-parameter-list"><li><span id="oncee"><span class="tsd-kind-type-parameter">E</span> <span class="tsd-signature-keyword">extends</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span></span></li></ul></section><div class="tsd-parameters"><h4 class="tsd-parameters-title">Parameters</h4><ul class="tsd-parameter-list"><li><span><span class="tsd-kind-parameter">eventName</span>: <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span></span><div class="tsd-comment tsd-typography"><p>The name of the event.</p>
</div></li><li><span><span class="tsd-kind-parameter">listener</span>: <span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span><span class="tsd-signature-symbol">)</span> <span class="tsd-signature-symbol">=></span> <span class="tsd-signature-type">void</span></span><div class="tsd-comment tsd-typography"><p>The callback function</p>
</div></li></ul></div><h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">this</span></h4><div class="tsd-comment tsd-typography"><div class="tsd-tag-since"><h4 class="tsd-anchor-link" id="since-8">Since<a href="#since-8" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h4><p>v0.3.0</p>
</div></div><aside class="tsd-sources"><p>Inherited from EventEmitter.once</p><ul><li>Defined in node_modules/@types/node/events.d.ts:256</li></ul></aside></div></li></ul></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="prependlistener"><span>prepend<wbr/>Listener</span><a href="#prependlistener" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class=""><div class="tsd-signature tsd-anchor-link" id="prependlistener-1"><span class="tsd-kind-call-signature">prependListener</span><span class="tsd-signature-symbol"><</span><a class="tsd-signature-type tsd-kind-type-parameter" href="#prependlistenere">E</a> <span class="tsd-signature-keyword">extends</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span><span class="tsd-signature-symbol">></span><span class="tsd-signature-symbol">(</span><br/> <span class="tsd-kind-parameter">eventName</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span><span class="tsd-signature-symbol">,</span><br/> <span class="tsd-kind-parameter">listener</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span><span class="tsd-signature-symbol">)</span> <span class="tsd-signature-symbol">=></span> <span class="tsd-signature-type">void</span><span class="tsd-signature-symbol">,</span><br/><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">this</span><a href="#prependlistener-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></div><div class="tsd-description"><div class="tsd-comment tsd-typography"><p>Adds the <code>listener</code> function to the <em>beginning</em> of the listeners array for the
event named <code>eventName</code>. No checks are made to see if the <code>listener</code> has
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
times.</p>
<pre><code class="js"><span class="hl-0">server.</span><span class="hl-7">prependListener</span><span class="hl-0">(</span><span class="hl-4">'connection'</span><span class="hl-0">, (</span><span class="hl-5">stream</span><span class="hl-0">) </span><span class="hl-1">=></span><span class="hl-0"> {</span><br/><span class="hl-0"> console.</span><span class="hl-7">log</span><span class="hl-0">(</span><span class="hl-4">'someone connected!'</span><span class="hl-0">);</span><br/><span class="hl-0">});</span>
</code><button type="button">Copy</button></pre>
<p>Returns a reference to the <code>EventEmitter</code>, so that calls can be chained.</p>
</div><section class="tsd-panel"><h4>Type Parameters</h4><ul class="tsd-type-parameter-list"><li><span id="prependlistenere"><span class="tsd-kind-type-parameter">E</span> <span class="tsd-signature-keyword">extends</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span></span></li></ul></section><div class="tsd-parameters"><h4 class="tsd-parameters-title">Parameters</h4><ul class="tsd-parameter-list"><li><span><span class="tsd-kind-parameter">eventName</span>: <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span></span><div class="tsd-comment tsd-typography"><p>The name of the event.</p>
</div></li><li><span><span class="tsd-kind-parameter">listener</span>: <span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span><span class="tsd-signature-symbol">)</span> <span class="tsd-signature-symbol">=></span> <span class="tsd-signature-type">void</span></span><div class="tsd-comment tsd-typography"><p>The callback function</p>
</div></li></ul></div><h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">this</span></h4><div class="tsd-comment tsd-typography"><div class="tsd-tag-since"><h4 class="tsd-anchor-link" id="since-9">Since<a href="#since-9" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h4><p>v6.0.0</p>
</div></div><aside class="tsd-sources"><p>Inherited from EventEmitter.prependListener</p><ul><li>Defined in node_modules/@types/node/events.d.ts:275</li></ul></aside></div></li></ul></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="prependoncelistener"><span>prepend<wbr/>Once<wbr/>Listener</span><a href="#prependoncelistener" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class=""><div class="tsd-signature tsd-anchor-link" id="prependoncelistener-1"><span class="tsd-kind-call-signature">prependOnceListener</span><span class="tsd-signature-symbol"><</span><a class="tsd-signature-type tsd-kind-type-parameter" href="#prependoncelistenere">E</a> <span class="tsd-signature-keyword">extends</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span><span class="tsd-signature-symbol">></span><span class="tsd-signature-symbol">(</span><br/> <span class="tsd-kind-parameter">eventName</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span><span class="tsd-signature-symbol">,</span><br/> <span class="tsd-kind-parameter">listener</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span><span class="tsd-signature-symbol">)</span> <span class="tsd-signature-symbol">=></span> <span class="tsd-signature-type">void</span><span class="tsd-signature-symbol">,</span><br/><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">this</span><a href="#prependoncelistener-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></div><div class="tsd-description"><div class="tsd-comment tsd-typography"><p>Adds a <strong>one-time</strong> <code>listener</code> function for the event named <code>eventName</code> to the
<em>beginning</em> of the listeners array. The next time <code>eventName</code> is triggered, this
listener is removed, and then invoked.</p>
<pre><code class="js"><span class="hl-0">server.</span><span class="hl-7">prependOnceListener</span><span class="hl-0">(</span><span class="hl-4">'connection'</span><span class="hl-0">, (</span><span class="hl-5">stream</span><span class="hl-0">) </span><span class="hl-1">=></span><span class="hl-0"> {</span><br/><span class="hl-0"> console.</span><span class="hl-7">log</span><span class="hl-0">(</span><span class="hl-4">'Ah, we have our first user!'</span><span class="hl-0">);</span><br/><span class="hl-0">});</span>
</code><button type="button">Copy</button></pre>
<p>Returns a reference to the <code>EventEmitter</code>, so that calls can be chained.</p>
</div><section class="tsd-panel"><h4>Type Parameters</h4><ul class="tsd-type-parameter-list"><li><span id="prependoncelistenere"><span class="tsd-kind-type-parameter">E</span> <span class="tsd-signature-keyword">extends</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span></span></li></ul></section><div class="tsd-parameters"><h4 class="tsd-parameters-title">Parameters</h4><ul class="tsd-parameter-list"><li><span><span class="tsd-kind-parameter">eventName</span>: <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span></span><div class="tsd-comment tsd-typography"><p>The name of the event.</p>
</div></li><li><span><span class="tsd-kind-parameter">listener</span>: <span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span><span class="tsd-signature-symbol">)</span> <span class="tsd-signature-symbol">=></span> <span class="tsd-signature-type">void</span></span><div class="tsd-comment tsd-typography"><p>The callback function</p>
</div></li></ul></div><h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">this</span></h4><div class="tsd-comment tsd-typography"><div class="tsd-tag-since"><h4 class="tsd-anchor-link" id="since-10">Since<a href="#since-10" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h4><p>v6.0.0</p>
</div></div><aside class="tsd-sources"><p>Inherited from EventEmitter.prependOnceListener</p><ul><li>Defined in node_modules/@types/node/events.d.ts:292</li></ul></aside></div></li></ul></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="prunecontexts"><span>prune<wbr/>Contexts</span><a href="#prunecontexts" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class=""><div class="tsd-signature tsd-anchor-link" id="prunecontexts-1"><span class="tsd-kind-call-signature">pruneContexts</span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">seconds</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">void</span><a href="#prunecontexts-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></div><div class="tsd-description"><div class="tsd-parameters"><h4 class="tsd-parameters-title">Parameters</h4><ul class="tsd-parameter-list"><li><span><span class="tsd-kind-parameter">seconds</span>: <span class="tsd-signature-type">number</span></span></li></ul></div><h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">void</span></h4><aside class="tsd-sources"><ul><li>Defined in <a href="https://github.com/SignalK/signalk-server/blob/67249e0e0fdcf7f9b0298bfada4cec32ea581a38/packages/server-api/src/fullsignalk.ts#L432">packages/server-api/src/fullsignalk.ts:432</a></li></ul></aside></div></li></ul></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="rawlisteners"><span>raw<wbr/>Listeners</span><a href="#rawlisteners" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class=""><div class="tsd-signature tsd-anchor-link" id="rawlisteners-1"><span class="tsd-kind-call-signature">rawListeners</span><span class="tsd-signature-symbol"><</span><a class="tsd-signature-type tsd-kind-type-parameter" href="#rawlistenerse">E</a> <span class="tsd-signature-keyword">extends</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span><span class="tsd-signature-symbol">></span><span class="tsd-signature-symbol">(</span><br/> <span class="tsd-kind-parameter">eventName</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span><span class="tsd-signature-symbol">,</span><br/><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">:</span> (<span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span><span class="tsd-signature-symbol">)</span> <span class="tsd-signature-symbol">=></span> <span class="tsd-signature-type">void</span>)<span class="tsd-signature-symbol">[]</span><a href="#rawlisteners-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></div><div class="tsd-description"><div class="tsd-comment tsd-typography"><p>Returns a copy of the array of listeners for the event named <code>eventName</code>,
including any wrappers (such as those created by <code>.once()</code>).</p>
<pre><code class="js"><span class="hl-1">import</span><span class="hl-0"> { EventEmitter } </span><span class="hl-1">from</span><span class="hl-0"> </span><span class="hl-4">'node:events'</span><span class="hl-0">;</span><br/><span class="hl-1">const</span><span class="hl-0"> </span><span class="hl-2">emitter</span><span class="hl-0"> </span><span class="hl-1">=</span><span class="hl-0"> </span><span class="hl-1">new</span><span class="hl-0"> </span><span class="hl-7">EventEmitter</span><span class="hl-0">();</span><br/><span class="hl-0">emitter.</span><span class="hl-7">once</span><span class="hl-0">(</span><span class="hl-4">'log'</span><span class="hl-0">, () </span><span class="hl-1">=></span><span class="hl-0"> console.</span><span class="hl-7">log</span><span class="hl-0">(</span><span class="hl-4">'log once'</span><span class="hl-0">));</span><br/><br/><span class="hl-6">// Returns a new Array with a function `onceWrapper` which has a property</span><br/><span class="hl-6">// `listener` which contains the original listener bound above</span><br/><span class="hl-1">const</span><span class="hl-0"> </span><span class="hl-2">listeners</span><span class="hl-0"> </span><span class="hl-1">=</span><span class="hl-0"> emitter.</span><span class="hl-7">rawListeners</span><span class="hl-0">(</span><span class="hl-4">'log'</span><span class="hl-0">);</span><br/><span class="hl-1">const</span><span class="hl-0"> </span><span class="hl-2">logFnWrapper</span><span class="hl-0"> </span><span class="hl-1">=</span><span class="hl-0"> listeners[</span><span class="hl-2">0</span><span class="hl-0">];</span><br/><br/><span class="hl-6">// Logs "log once" to the console and does not unbind the `once` event</span><br/><span class="hl-0">logFnWrapper.</span><span class="hl-7">listener</span><span class="hl-0">();</span><br/><br/><span class="hl-6">// Logs "log once" to the console and removes the listener</span><br/><span class="hl-7">logFnWrapper</span><span class="hl-0">();</span><br/><br/><span class="hl-0">emitter.</span><span class="hl-7">on</span><span class="hl-0">(</span><span class="hl-4">'log'</span><span class="hl-0">, () </span><span class="hl-1">=></span><span class="hl-0"> console.</span><span class="hl-7">log</span><span class="hl-0">(</span><span class="hl-4">'log persistently'</span><span class="hl-0">));</span><br/><span class="hl-6">// Will return a new Array with a single function bound by `.on()` above</span><br/><span class="hl-1">const</span><span class="hl-0"> </span><span class="hl-2">newListeners</span><span class="hl-0"> </span><span class="hl-1">=</span><span class="hl-0"> emitter.</span><span class="hl-7">rawListeners</span><span class="hl-0">(</span><span class="hl-4">'log'</span><span class="hl-0">);</span><br/><br/><span class="hl-6">// Logs "log persistently" twice</span><br/><span class="hl-0">newListeners[</span><span class="hl-2">0</span><span class="hl-0">]();</span><br/><span class="hl-0">emitter.</span><span class="hl-7">emit</span><span class="hl-0">(</span><span class="hl-4">'log'</span><span class="hl-0">);</span>
</code><button type="button">Copy</button></pre>
</div><section class="tsd-panel"><h4>Type Parameters</h4><ul class="tsd-type-parameter-list"><li><span id="rawlistenerse"><span class="tsd-kind-type-parameter">E</span> <span class="tsd-signature-keyword">extends</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span></span></li></ul></section><div class="tsd-parameters"><h4 class="tsd-parameters-title">Parameters</h4><ul class="tsd-parameter-list"><li><span><span class="tsd-kind-parameter">eventName</span>: <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span></span></li></ul></div><h4 class="tsd-returns-title">Returns (<span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span><span class="tsd-signature-symbol">)</span> <span class="tsd-signature-symbol">=></span> <span class="tsd-signature-type">void</span>)<span class="tsd-signature-symbol">[]</span></h4><div class="tsd-comment tsd-typography"><div class="tsd-tag-since"><h4 class="tsd-anchor-link" id="since-11">Since<a href="#since-11" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h4><p>v9.4.0</p>
</div></div><aside class="tsd-sources"><p>Inherited from EventEmitter.rawListeners</p><ul><li>Defined in node_modules/@types/node/events.d.ts:326</li></ul></aside></div></li></ul></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="removealllisteners"><span>remove<wbr/>All<wbr/>Listeners</span><a href="#removealllisteners" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class=""><div class="tsd-signature tsd-anchor-link" id="removealllisteners-1"><span class="tsd-kind-call-signature">removeAllListeners</span><span class="tsd-signature-symbol"><</span><a class="tsd-signature-type tsd-kind-type-parameter" href="#removealllistenerse">E</a> <span class="tsd-signature-keyword">extends</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span><span class="tsd-signature-symbol">></span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">eventName</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">this</span><a href="#removealllisteners-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></div><div class="tsd-description"><div class="tsd-comment tsd-typography"><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>
</div><section class="tsd-panel"><h4>Type Parameters</h4><ul class="tsd-type-parameter-list"><li><span id="removealllistenerse"><span class="tsd-kind-type-parameter">E</span> <span class="tsd-signature-keyword">extends</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span></span></li></ul></section><div class="tsd-parameters"><h4 class="tsd-parameters-title">Parameters</h4><ul class="tsd-parameter-list"><li><span><code class="tsd-tag">Optional</code><span class="tsd-kind-parameter">eventName</span>: <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span></span></li></ul></div><h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">this</span></h4><div class="tsd-comment tsd-typography"><div class="tsd-tag-since"><h4 class="tsd-anchor-link" id="since-12">Since<a href="#since-12" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h4><p>v0.1.26</p>
</div></div><aside class="tsd-sources"><p>Inherited from EventEmitter.removeAllListeners</p><ul><li>Defined in node_modules/@types/node/events.d.ts:338</li></ul></aside></div></li></ul></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="removelistener"><span>remove<wbr/>Listener</span><a href="#removelistener" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class=""><div class="tsd-signature tsd-anchor-link" id="removelistener-1"><span class="tsd-kind-call-signature">removeListener</span><span class="tsd-signature-symbol"><</span><a class="tsd-signature-type tsd-kind-type-parameter" href="#removelistenere">E</a> <span class="tsd-signature-keyword">extends</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span><span class="tsd-signature-symbol">></span><span class="tsd-signature-symbol">(</span><br/> <span class="tsd-kind-parameter">eventName</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span><span class="tsd-signature-symbol">,</span><br/> <span class="tsd-kind-parameter">listener</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span><span class="tsd-signature-symbol">)</span> <span class="tsd-signature-symbol">=></span> <span class="tsd-signature-type">void</span><span class="tsd-signature-symbol">,</span><br/><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">this</span><a href="#removelistener-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></div><div class="tsd-description"><div class="tsd-comment tsd-typography"><p>Removes the specified <code>listener</code> from the listener array for the event named
<code>eventName</code>.</p>
<pre><code class="js"><span class="hl-1">const</span><span class="hl-0"> </span><span class="hl-7">callback</span><span class="hl-0"> </span><span class="hl-1">=</span><span class="hl-0"> (</span><span class="hl-5">stream</span><span class="hl-0">) </span><span class="hl-1">=></span><span class="hl-0"> {</span><br/><span class="hl-0"> console.</span><span class="hl-7">log</span><span class="hl-0">(</span><span class="hl-4">'someone connected!'</span><span class="hl-0">);</span><br/><span class="hl-0">};</span><br/><span class="hl-0">server.</span><span class="hl-7">on</span><span class="hl-0">(</span><span class="hl-4">'connection'</span><span class="hl-0">, callback);</span><br/><span class="hl-6">// ...</span><br/><span class="hl-0">server.</span><span class="hl-7">removeListener</span><span class="hl-0">(</span><span class="hl-4">'connection'</span><span class="hl-0">, callback);</span>
</code><button type="button">Copy</button></pre>
<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>
<pre><code class="js"><span class="hl-1">import</span><span class="hl-0"> { EventEmitter } </span><span class="hl-1">from</span><span class="hl-0"> </span><span class="hl-4">'node:events'</span><span class="hl-0">;</span><br/><span class="hl-1">class</span><span class="hl-0"> </span><span class="hl-5">MyEmitter</span><span class="hl-0"> </span><span class="hl-1">extends</span><span class="hl-0"> </span><span class="hl-2">EventEmitter</span><span class="hl-0"> {}</span><br/><span class="hl-1">const</span><span class="hl-0"> </span><span class="hl-2">myEmitter</span><span class="hl-0"> </span><span class="hl-1">=</span><span class="hl-0"> </span><span class="hl-1">new</span><span class="hl-0"> </span><span class="hl-7">MyEmitter</span><span class="hl-0">();</span><br/><br/><span class="hl-1">const</span><span class="hl-0"> </span><span class="hl-7">callbackA</span><span class="hl-0"> </span><span class="hl-1">=</span><span class="hl-0"> () </span><span class="hl-1">=></span><span class="hl-0"> {</span><br/><span class="hl-0"> console.</span><span class="hl-7">log</span><span class="hl-0">(</span><span class="hl-4">'A'</span><span class="hl-0">);</span><br/><span class="hl-0"> myEmitter.</span><span class="hl-7">removeListener</span><span class="hl-0">(</span><span class="hl-4">'event'</span><span class="hl-0">, callbackB);</span><br/><span class="hl-0">};</span><br/><br/><span class="hl-1">const</span><span class="hl-0"> </span><span class="hl-7">callbackB</span><span class="hl-0"> </span><span class="hl-1">=</span><span class="hl-0"> () </span><span class="hl-1">=></span><span class="hl-0"> {</span><br/><span class="hl-0"> console.</span><span class="hl-7">log</span><span class="hl-0">(</span><span class="hl-4">'B'</span><span class="hl-0">);</span><br/><span class="hl-0">};</span><br/><br/><span class="hl-0">myEmitter.</span><span class="hl-7">on</span><span class="hl-0">(</span><span class="hl-4">'event'</span><span class="hl-0">, callbackA);</span><br/><br/><span class="hl-0">myEmitter.</span><span class="hl-7">on</span><span class="hl-0">(</span><span class="hl-4">'event'</span><span class="hl-0">, callbackB);</span><br/><br/><span class="hl-6">// callbackA removes listener callbackB but it will still be called.</span><br/><span class="hl-6">// Internal listener array at time of emit [callbackA, callbackB]</span><br/><span class="hl-0">myEmitter.</span><span class="hl-7">emit</span><span class="hl-0">(</span><span class="hl-4">'event'</span><span class="hl-0">);</span><br/><span class="hl-6">// Prints:</span><br/><span class="hl-6">// A</span><br/><span class="hl-6">// B</span><br/><br/><span class="hl-6">// callbackB is now removed.</span><br/><span class="hl-6">// Internal listener array [callbackA]</span><br/><span class="hl-0">myEmitter.</span><span class="hl-7">emit</span><span class="hl-0">(</span><span class="hl-4">'event'</span><span class="hl-0">);</span><br/><span class="hl-6">// Prints:</span><br/><span class="hl-6">// A</span>
</code><button type="button">Copy</button></pre>
<p>Because listeners are managed using an internal array, calling this will
change the position indexes 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>
<pre><code class="js"><span class="hl-1">import</span><span class="hl-0"> { EventEmitter } </span><span class="hl-1">from</span><span class="hl-0"> </span><span class="hl-4">'node:events'</span><span class="hl-0">;</span><br/><span class="hl-1">const</span><span class="hl-0"> </span><span class="hl-2">ee</span><span class="hl-0"> </span><span class="hl-1">=</span><span class="hl-0"> </span><span class="hl-1">new</span><span class="hl-0"> </span><span class="hl-7">EventEmitter</span><span class="hl-0">();</span><br/><br/><span class="hl-1">function</span><span class="hl-0"> </span><span class="hl-7">pong</span><span class="hl-0">() {</span><br/><span class="hl-0"> console.</span><span class="hl-7">log</span><span class="hl-0">(</span><span class="hl-4">'pong'</span><span class="hl-0">);</span><br/><span class="hl-0">}</span><br/><br/><span class="hl-0">ee.</span><span class="hl-7">on</span><span class="hl-0">(</span><span class="hl-4">'ping'</span><span class="hl-0">, pong);</span><br/><span class="hl-0">ee.</span><span class="hl-7">once</span><span class="hl-0">(</span><span class="hl-4">'ping'</span><span class="hl-0">, pong);</span><br/><span class="hl-0">ee.</span><span class="hl-7">removeListener</span><span class="hl-0">(</span><span class="hl-4">'ping'</span><span class="hl-0">, pong);</span><br/><br/><span class="hl-0">ee.</span><span class="hl-7">emit</span><span class="hl-0">(</span><span class="hl-4">'ping'</span><span class="hl-0">);</span><br/><span class="hl-0">ee.</span><span class="hl-7">emit</span><span class="hl-0">(</span><span class="hl-4">'ping'</span><span class="hl-0">);</span>
</code><button type="button">Copy</button></pre>
<p>Returns a reference to the <code>EventEmitter</code>, so that calls can be chained.</p>
</div><section class="tsd-panel"><h4>Type Parameters</h4><ul class="tsd-type-parameter-list"><li><span id="removelistenere"><span class="tsd-kind-type-parameter">E</span> <span class="tsd-signature-keyword">extends</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span></span></li></ul></section><div class="tsd-parameters"><h4 class="tsd-parameters-title">Parameters</h4><ul class="tsd-parameter-list"><li><span><span class="tsd-kind-parameter">eventName</span>: <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span></span></li><li><span><span class="tsd-kind-parameter">listener</span>: <span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span><span class="tsd-signature-symbol">)</span> <span class="tsd-signature-symbol">=></span> <span class="tsd-signature-type">void</span></span></li></ul></div><h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">this</span></h4><div class="tsd-comment tsd-typography"><div class="tsd-tag-since"><h4 class="tsd-anchor-link" id="since-13">Since<a href="#since-13" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h4><p>v0.1.26</p>
</div></div><aside class="tsd-sources"><p>Inherited from EventEmitter.removeListener</p><ul><li>Defined in node_modules/@types/node/events.d.ts:425</li></ul></aside></div></li></ul></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="retrieve"><span>retrieve</span><a href="#retrieve" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class=""><div class="tsd-signature tsd-anchor-link" id="retrieve-1"><span class="tsd-kind-call-signature">retrieve</span><span class="tsd-signature-symbol">()</span><span class="tsd-signature-symbol">:</span> <a href="https://www.typescriptlang.org/docs/handbook/utility-types.html#recordkeys-type" class="tsd-signature-type external" target="_blank">Record</a><span class="tsd-signature-symbol"><</span><span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">,</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">></span><a href="#retrieve-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></div><div class="tsd-description"><h4 class="tsd-returns-title">Returns <a href="https://www.typescriptlang.org/docs/handbook/utility-types.html#recordkeys-type" class="tsd-signature-type external" target="_blank">Record</a><span class="tsd-signature-symbol"><</span><span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">,</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">></span></h4><aside class="tsd-sources"><ul><li>Defined in <a href="https://github.com/SignalK/signalk-server/blob/67249e0e0fdcf7f9b0298bfada4cec32ea581a38/packages/server-api/src/fullsignalk.ts#L393">packages/server-api/src/fullsignalk.ts:393</a></li></ul></aside></div></li></ul></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="setmaxlisteners"><span>set<wbr/>Max<wbr/>Listeners</span><a href="#setmaxlisteners" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class=""><div class="tsd-signature tsd-anchor-link" id="setmaxlisteners-1"><span class="tsd-kind-call-signature">setMaxListeners</span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">n</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">this</span><a href="#setmaxlisteners-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></div><div class="tsd-description"><div class="tsd-comment tsd-typography"><p>By default <code>EventEmitter</code>s will print a warning if more than <code>10</code> listeners are
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>
</div><div class="tsd-parameters"><h4 class="tsd-parameters-title">Parameters</h4><ul class="tsd-parameter-list"><li><span><span class="tsd-kind-parameter">n</span>: <span class="tsd-signature-type">number</span></span></li></ul></div><h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">this</span></h4><div class="tsd-comment tsd-typography"><div class="tsd-tag-since"><h4 class="tsd-anchor-link" id="since-14">Since<a href="#since-14" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h4><p>v0.3.5</p>
</div></div><aside class="tsd-sources"><p>Inherited from EventEmitter.setMaxListeners</p><ul><li>Defined in node_modules/@types/node/events.d.ts:436</li></ul></aside></div></li></ul></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="updatelastmodified"><span>update<wbr/>Last<wbr/>Modified</span><a href="#updatelastmodified" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class=""><div class="tsd-signature tsd-anchor-link" id="updatelastmodified-1"><span class="tsd-kind-call-signature">updateLastModified</span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">contextKey</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">void</span><a href="#updatelastmodified-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></div><div class="tsd-description"><div class="tsd-parameters"><h4 class="tsd-parameters-title">Parameters</h4><ul class="tsd-parameter-list"><li><span><span class="tsd-kind-parameter">contextKey</span>: <span class="tsd-signature-type">string</span></span></li></ul></div><h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">void</span></h4><aside class="tsd-sources"><ul><li>Defined in <a href="https://github.com/SignalK/signalk-server/blob/67249e0e0fdcf7f9b0298bfada4cec32ea581a38/packages/server-api/src/fullsignalk.ts#L428">packages/server-api/src/fullsignalk.ts:428</a></li></ul></aside></div></li></ul></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="capturerejectionsymbol"><code class="tsd-tag">Optional</code><span>[capture<wbr/>Rejection<wbr/>Symbol]</span><a href="#capturerejectionsymbol" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul class="tsd-signatures"><li class=""><div class="tsd-signature tsd-anchor-link" id="capturerejectionsymbol-1"><span class="tsd-kind-call-signature">"[captureRejectionSymbol]"</span><span class="tsd-signature-symbol">?</span><span class="tsd-signature-symbol">(</span><br/> <span class="tsd-kind-parameter">error</span><span class="tsd-signature-symbol">:</span> <a href="https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error" class="tsd-signature-type external" target="_blank">Error</a><span class="tsd-signature-symbol">,</span><br/> <span class="tsd-kind-parameter">event</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span><span class="tsd-signature-symbol">,</span><br/> <span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span><span class="tsd-signature-symbol">,</span><br/><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">void</span><a href="#capturerejectionsymbol-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></div><div class="tsd-description"><div class="tsd-comment tsd-typography"><p>The <code>Symbol.for('nodejs.rejection')</code> method is called in case a
promise rejection happens when emitting an event and
<code>captureRejections</code> is enabled on the emitter.
It is possible to use <code>events.captureRejectionSymbol</code> in
place of <code>Symbol.for('nodejs.rejection')</code>.</p>
<pre><code class="js"><span class="hl-1">import</span><span class="hl-0"> { EventEmitter, captureRejectionSymbol } </span><span class="hl-1">from</span><span class="hl-0"> </span><span class="hl-4">'node:events'</span><span class="hl-0">;</span><br/><br/><span class="hl-1">class</span><span class="hl-0"> </span><span class="hl-5">MyClass</span><span class="hl-0"> </span><span class="hl-1">extends</span><span class="hl-0"> </span><span class="hl-2">EventEmitter</span><span class="hl-0"> {</span><br/><span class="hl-0"> </span><span class="hl-1">constructor</span><span class="hl-0">() {</span><br/><span class="hl-0"> </span><span class="hl-2">super</span><span class="hl-0">({ captureRejections: </span><span class="hl-2">true</span><span class="hl-0"> });</span><br/><span class="hl-0"> }</span><br/><br/><span class="hl-0"> [captureRejectionSymbol](</span><span class="hl-5">err</span><span class="hl-0">, </span><span class="hl-5">event</span><span class="hl-0">, </span><span class="hl-1">...</span><span class="hl-5">args</span><span class="hl-0">) {</span><br/><span class="hl-0"> console.</span><span class="hl-7">log</span><span class="hl-0">(</span><span class="hl-4">'rejection happened for'</span><span class="hl-0">, event, </span><span class="hl-4">'with'</span><span class="hl-0">, err, </span><span class="hl-1">...</span><span class="hl-0">args);</span><br/><span class="hl-0"> </span><span class="hl-2">this</span><span class="hl-0">.</span><span class="hl-7">destroy</span><span class="hl-0">(err);</span><br/><span class="hl-0"> }</span><br/><br/><span class="hl-0"> </span><span class="hl-7">destroy</span><span class="hl-0">(</span><span class="hl-5">err</span><span class="hl-0">) {</span><br/><span class="hl-0"> </span><span class="hl-6">// Tear the resource down here.</span><br/><span class="hl-0"> }</span><br/><span class="hl-0">}</span>
</code><button type="button">Copy</button></pre>
</div><div class="tsd-parameters"><h4 class="tsd-parameters-title">Parameters</h4><ul class="tsd-parameter-list"><li><span><span class="tsd-kind-parameter">error</span>: <a href="https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error" class="tsd-signature-type external" target="_blank">Error</a></span></li><li><span><span class="tsd-kind-parameter">event</span>: <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">symbol</span></span></li><li><span><span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span>: <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span></span></li></ul></div><h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">void</span></h4><div class="tsd-comment tsd-typography"><div class="tsd-tag-since"><h4 class="tsd-anchor-link" id="since-15">Since<a href="#since-15" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h4><p>v13.4.0, v12.16.0</p>
</div></div><aside class="tsd-sources"><p>Inherited from EventEmitter.[captureRejectionSymbol]</p><ul><li>Defined in node_modules/@types/node/events.d.ts:87</li></ul></aside></div></li></ul></section></section></details></div><div class="col-sidebar"><div class="page-menu"><details open class="tsd-accordion tsd-page-navigation"><summary class="tsd-accordion-summary"><svg width="20" height="20" viewBox="0 0 24 24" fill="none" aria-hidden="true"><use href="../../assets/icons.svg#icon-chevronDown"></use></svg><h3>On This Page</h3></summary><div class="tsd-accordion-details"><details open class="tsd-accordion tsd-page-navigation-section"><summary class="tsd-accordion-summary" data-key="section-Constructors"><svg width="20" height="20" viewBox="0 0 24 24" fill="none" aria-hidden="true"><use href="../../assets/icons.svg#icon-chevronDown"></use></svg>Constructors</summary><div><a href="#constructor"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Constructor"><use href="../../assets/icons.svg#icon-512"></use></svg><span>constructor</span></a></div></details><details open class="tsd-accordion tsd-page-navigation-section"><summary class="tsd-accordion-summary" data-key="section-Properties"><svg width="20" height="20" viewBox="0 0 24 24" fill="none" aria-hidden="true"><use href="../../assets/icons.svg#icon-chevronDown"></use></svg>Properties</summary><div><a href="#lastmodifieds"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Property"><use href="../../assets/icons.svg#icon-1024"></use></svg><span>last<wbr/>Modifieds</span></a><a href="#root"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Property"><use href="../../assets/icons.svg#icon-1024"></use></svg><span>root</span></a><a href="#self"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Property"><use href="../../assets/icons.svg#icon-1024"></use></svg><span>self</span></a><a href="#sourcemeta"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Property"><use href="../../assets/icons.svg#icon-1024"></use></svg><span>source<wbr/>Meta</span></a><a href="#sources"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Property"><use href="../../assets/icons.svg#icon-1024"></use></svg><span>sources</span></a></div></details><details open class="tsd-accordion tsd-page-navigation-section"><summary class="tsd-accordion-summary" data-key="section-Methods"><svg width="20" height="20" viewBox="0 0 24 24" fill="none" aria-hidden="true"><use href="../../assets/icons.svg#icon-chevronDown"></use></svg>Methods</summary><div><a href="#adddelta"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>add<wbr/>Delta</span></a><a href="#addlistener"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>add<wbr/>Listener</span></a><a href="#deletecontext"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>delete<wbr/>Context</span></a><a href="#emit"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>emit</span></a><a href="#eventnames"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>event<wbr/>Names</span></a><a href="#getmaxlisteners"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>get<wbr/>Max<wbr/>Listeners</span></a><a href="#listenercount"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>listener<wbr/>Count</span></a><a href="#listeners"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>listeners</span></a><a href="#off"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>off</span></a><a href="#on"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>on</span></a><a href="#once"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>once</span></a><a href="#prependlistener"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>prepend<wbr/>Listener</span></a><a href="#prependoncelistener"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>prepend<wbr/>Once<wbr/>Listener</span></a><a href="#prunecontexts"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>prune<wbr/>Contexts</span></a><a href="#rawlisteners"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>raw<wbr/>Listeners</span></a><a href="#removealllisteners"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>remove<wbr/>All<wbr/>Listeners</span></a><a href="#removelistener"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>remove<wbr/>Listener</span></a><a href="#retrieve"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>retrieve</span></a><a href="#setmaxlisteners"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>set<wbr/>Max<wbr/>Listeners</span></a><a href="#updatelastmodified"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>update<wbr/>Last<wbr/>Modified</span></a><a href="#capturerejectionsymbol"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Method"><use href="../../assets/icons.svg#icon-2048"></use></svg><span>[capture<wbr/>Rejection<wbr/>Symbol]</span></a></div></details></div></details></div><div class="site-menu"><nav class="tsd-navigation"><a href="../../modules.html">Signal K</a><ul class="tsd-small-nested-navigation" id="tsd-nav-container"><li>Loading...</li></ul></nav></div></div></div><footer><p class="tsd-generator">Generated using <a href="https://typedoc.org/" target="_blank">TypeDoc</a></p></footer><div class="overlay"></div></body></html>