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<li class="pinned-header">Node.js v20.18.0</li>
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Table of contents
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<div class="picker"><div class="toc"><ul>
<li><a href="#global-objects">Global objects</a>
<ul>
<li><a href="#class-abortcontroller">Class: <code>AbortController</code></a>
<ul>
<li><a href="#abortcontrollerabortreason"><code>abortController.abort([reason])</code></a></li>
<li><a href="#abortcontrollersignal"><code>abortController.signal</code></a></li>
<li><a href="#class-abortsignal">Class: <code>AbortSignal</code></a>
<ul>
<li><a href="#static-method-abortsignalabortreason">Static method: <code>AbortSignal.abort([reason])</code></a></li>
<li><a href="#static-method-abortsignaltimeoutdelay">Static method: <code>AbortSignal.timeout(delay)</code></a></li>
<li><a href="#static-method-abortsignalanysignals">Static method: <code>AbortSignal.any(signals)</code></a></li>
<li><a href="#event-abort">Event: <code>'abort'</code></a></li>
<li><a href="#abortsignalaborted"><code>abortSignal.aborted</code></a></li>
<li><a href="#abortsignalonabort"><code>abortSignal.onabort</code></a></li>
<li><a href="#abortsignalreason"><code>abortSignal.reason</code></a></li>
<li><a href="#abortsignalthrowifaborted"><code>abortSignal.throwIfAborted()</code></a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#class-blob">Class: <code>Blob</code></a></li>
<li><a href="#class-buffer">Class: <code>Buffer</code></a></li>
<li><span class="stability_1"><a href="#class-bytelengthqueuingstrategy">Class: <code>ByteLengthQueuingStrategy</code></a></span></li>
<li><a href="#__dirname"><code>__dirname</code></a></li>
<li><a href="#__filename"><code>__filename</code></a></li>
<li><span class="stability_3"><a href="#atobdata"><code>atob(data)</code></a></span></li>
<li><a href="#broadcastchannel"><code>BroadcastChannel</code></a></li>
<li><span class="stability_3"><a href="#btoadata"><code>btoa(data)</code></a></span></li>
<li><a href="#clearimmediateimmediateobject"><code>clearImmediate(immediateObject)</code></a></li>
<li><a href="#clearintervalintervalobject"><code>clearInterval(intervalObject)</code></a></li>
<li><a href="#cleartimeouttimeoutobject"><code>clearTimeout(timeoutObject)</code></a></li>
<li><span class="stability_1"><a href="#class-compressionstream">Class: <code>CompressionStream</code></a></span></li>
<li><a href="#console"><code>console</code></a></li>
<li><span class="stability_1"><a href="#class-countqueuingstrategy">Class: <code>CountQueuingStrategy</code></a></span></li>
<li><span class="stability_1"><a href="#crypto"><code>Crypto</code></a></span></li>
<li><span class="stability_1"><a href="#crypto_1"><code>crypto</code></a></span></li>
<li><span class="stability_1"><a href="#cryptokey"><code>CryptoKey</code></a></span></li>
<li><span class="stability_1"><a href="#customevent"><code>CustomEvent</code></a></span></li>
<li><span class="stability_1"><a href="#class-decompressionstream">Class: <code>DecompressionStream</code></a></span></li>
<li><a href="#event"><code>Event</code></a></li>
<li><span class="stability_1"><a href="#eventsource"><code>EventSource</code></a></span></li>
<li><a href="#eventtarget"><code>EventTarget</code></a></li>
<li><a href="#exports"><code>exports</code></a></li>
<li><span class="stability_1"><a href="#fetch"><code>fetch</code></a></span></li>
<li><a href="#class-file">Class: <code>File</code></a></li>
<li><span class="stability_1"><a href="#class-formdata">Class <code>FormData</code></a></span></li>
<li><span class="stability_3"><a href="#global"><code>global</code></a></span></li>
<li><span class="stability_1"><a href="#class-headers">Class <code>Headers</code></a></span></li>
<li><a href="#messagechannel"><code>MessageChannel</code></a></li>
<li><a href="#messageevent"><code>MessageEvent</code></a></li>
<li><a href="#messageport"><code>MessagePort</code></a></li>
<li><a href="#module"><code>module</code></a></li>
<li><a href="#performanceentry"><code>PerformanceEntry</code></a></li>
<li><a href="#performancemark"><code>PerformanceMark</code></a></li>
<li><a href="#performancemeasure"><code>PerformanceMeasure</code></a></li>
<li><a href="#performanceobserver"><code>PerformanceObserver</code></a></li>
<li><a href="#performanceobserverentrylist"><code>PerformanceObserverEntryList</code></a></li>
<li><a href="#performanceresourcetiming"><code>PerformanceResourceTiming</code></a></li>
<li><a href="#performance"><code>performance</code></a></li>
<li><a href="#process"><code>process</code></a></li>
<li><a href="#queuemicrotaskcallback"><code>queueMicrotask(callback)</code></a></li>
<li><span class="stability_1"><a href="#class-readablebytestreamcontroller">Class: <code>ReadableByteStreamController</code></a></span></li>
<li><span class="stability_1"><a href="#class-readablestream">Class: <code>ReadableStream</code></a></span></li>
<li><span class="stability_1"><a href="#class-readablestreambyobreader">Class: <code>ReadableStreamBYOBReader</code></a></span></li>
<li><span class="stability_1"><a href="#class-readablestreambyobrequest">Class: <code>ReadableStreamBYOBRequest</code></a></span></li>
<li><span class="stability_1"><a href="#class-readablestreamdefaultcontroller">Class: <code>ReadableStreamDefaultController</code></a></span></li>
<li><span class="stability_1"><a href="#class-readablestreamdefaultreader">Class: <code>ReadableStreamDefaultReader</code></a></span></li>
<li><a href="#require"><code>require()</code></a></li>
<li><span class="stability_1"><a href="#response"><code>Response</code></a></span></li>
<li><span class="stability_1"><a href="#request"><code>Request</code></a></span></li>
<li><a href="#setimmediatecallback-args"><code>setImmediate(callback[, ...args])</code></a></li>
<li><a href="#setintervalcallback-delay-args"><code>setInterval(callback, delay[, ...args])</code></a></li>
<li><a href="#settimeoutcallback-delay-args"><code>setTimeout(callback, delay[, ...args])</code></a></li>
<li><a href="#structuredclonevalue-options"><code>structuredClone(value[, options])</code></a></li>
<li><span class="stability_1"><a href="#subtlecrypto"><code>SubtleCrypto</code></a></span></li>
<li><a href="#domexception"><code>DOMException</code></a></li>
<li><a href="#textdecoder"><code>TextDecoder</code></a></li>
<li><span class="stability_1"><a href="#class-textdecoderstream">Class: <code>TextDecoderStream</code></a></span></li>
<li><a href="#textencoder"><code>TextEncoder</code></a></li>
<li><span class="stability_1"><a href="#class-textencoderstream">Class: <code>TextEncoderStream</code></a></span></li>
<li><span class="stability_1"><a href="#class-transformstream">Class: <code>TransformStream</code></a></span></li>
<li><span class="stability_1"><a href="#class-transformstreamdefaultcontroller">Class: <code>TransformStreamDefaultController</code></a></span></li>
<li><a href="#url"><code>URL</code></a></li>
<li><a href="#urlsearchparams"><code>URLSearchParams</code></a></li>
<li><a href="#webassembly"><code>WebAssembly</code></a></li>
<li><span class="stability_1"><a href="#websocket"><code>WebSocket</code></a></span></li>
<li><span class="stability_1"><a href="#class-writablestream">Class: <code>WritableStream</code></a></span></li>
<li><span class="stability_1"><a href="#class-writablestreamdefaultcontroller">Class: <code>WritableStreamDefaultController</code></a></span></li>
<li><span class="stability_1"><a href="#class-writablestreamdefaultwriter">Class: <code>WritableStreamDefaultWriter</code></a></span></li>
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<li><a href="https://nodejs.org/docs/latest-v18.x/api/globals.html">18.x <b>LTS</b></a></li>
<li><a href="https://nodejs.org/docs/latest-v17.x/api/globals.html">17.x</a></li>
<li><a href="https://nodejs.org/docs/latest-v16.x/api/globals.html">16.x</a></li>
<li><a href="https://nodejs.org/docs/latest-v15.x/api/globals.html">15.x</a></li>
<li><a href="https://nodejs.org/docs/latest-v14.x/api/globals.html">14.x</a></li>
<li><a href="https://nodejs.org/docs/latest-v13.x/api/globals.html">13.x</a></li>
<li><a href="https://nodejs.org/docs/latest-v12.x/api/globals.html">12.x</a></li>
<li><a href="https://nodejs.org/docs/latest-v11.x/api/globals.html">11.x</a></li>
<li><a href="https://nodejs.org/docs/latest-v10.x/api/globals.html">10.x</a></li>
<li><a href="https://nodejs.org/docs/latest-v9.x/api/globals.html">9.x</a></li>
<li><a href="https://nodejs.org/docs/latest-v8.x/api/globals.html">8.x</a></li>
<li><a href="https://nodejs.org/docs/latest-v7.x/api/globals.html">7.x</a></li>
<li><a href="https://nodejs.org/docs/latest-v6.x/api/globals.html">6.x</a></li>
<li><a href="https://nodejs.org/docs/latest-v5.x/api/globals.html">5.x</a></li>
<li><a href="https://nodejs.org/docs/latest-v4.x/api/globals.html">4.x</a></li>
<li><a href="https://nodejs.org/docs/latest-v0.12.x/api/globals.html">0.12.x</a></li>
<li><a href="https://nodejs.org/docs/latest-v0.10.x/api/globals.html">0.10.x</a></li></ol></div>
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<hr>
</header>
<details role="navigation" id="toc" open><summary>Table of contents</summary><ul>
<li><a href="#global-objects">Global objects</a>
<ul>
<li><a href="#class-abortcontroller">Class: <code>AbortController</code></a>
<ul>
<li><a href="#abortcontrollerabortreason"><code>abortController.abort([reason])</code></a></li>
<li><a href="#abortcontrollersignal"><code>abortController.signal</code></a></li>
<li><a href="#class-abortsignal">Class: <code>AbortSignal</code></a>
<ul>
<li><a href="#static-method-abortsignalabortreason">Static method: <code>AbortSignal.abort([reason])</code></a></li>
<li><a href="#static-method-abortsignaltimeoutdelay">Static method: <code>AbortSignal.timeout(delay)</code></a></li>
<li><a href="#static-method-abortsignalanysignals">Static method: <code>AbortSignal.any(signals)</code></a></li>
<li><a href="#event-abort">Event: <code>'abort'</code></a></li>
<li><a href="#abortsignalaborted"><code>abortSignal.aborted</code></a></li>
<li><a href="#abortsignalonabort"><code>abortSignal.onabort</code></a></li>
<li><a href="#abortsignalreason"><code>abortSignal.reason</code></a></li>
<li><a href="#abortsignalthrowifaborted"><code>abortSignal.throwIfAborted()</code></a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#class-blob">Class: <code>Blob</code></a></li>
<li><a href="#class-buffer">Class: <code>Buffer</code></a></li>
<li><span class="stability_1"><a href="#class-bytelengthqueuingstrategy">Class: <code>ByteLengthQueuingStrategy</code></a></span></li>
<li><a href="#__dirname"><code>__dirname</code></a></li>
<li><a href="#__filename"><code>__filename</code></a></li>
<li><span class="stability_3"><a href="#atobdata"><code>atob(data)</code></a></span></li>
<li><a href="#broadcastchannel"><code>BroadcastChannel</code></a></li>
<li><span class="stability_3"><a href="#btoadata"><code>btoa(data)</code></a></span></li>
<li><a href="#clearimmediateimmediateobject"><code>clearImmediate(immediateObject)</code></a></li>
<li><a href="#clearintervalintervalobject"><code>clearInterval(intervalObject)</code></a></li>
<li><a href="#cleartimeouttimeoutobject"><code>clearTimeout(timeoutObject)</code></a></li>
<li><span class="stability_1"><a href="#class-compressionstream">Class: <code>CompressionStream</code></a></span></li>
<li><a href="#console"><code>console</code></a></li>
<li><span class="stability_1"><a href="#class-countqueuingstrategy">Class: <code>CountQueuingStrategy</code></a></span></li>
<li><span class="stability_1"><a href="#crypto"><code>Crypto</code></a></span></li>
<li><span class="stability_1"><a href="#crypto_1"><code>crypto</code></a></span></li>
<li><span class="stability_1"><a href="#cryptokey"><code>CryptoKey</code></a></span></li>
<li><span class="stability_1"><a href="#customevent"><code>CustomEvent</code></a></span></li>
<li><span class="stability_1"><a href="#class-decompressionstream">Class: <code>DecompressionStream</code></a></span></li>
<li><a href="#event"><code>Event</code></a></li>
<li><span class="stability_1"><a href="#eventsource"><code>EventSource</code></a></span></li>
<li><a href="#eventtarget"><code>EventTarget</code></a></li>
<li><a href="#exports"><code>exports</code></a></li>
<li><span class="stability_1"><a href="#fetch"><code>fetch</code></a></span></li>
<li><a href="#class-file">Class: <code>File</code></a></li>
<li><span class="stability_1"><a href="#class-formdata">Class <code>FormData</code></a></span></li>
<li><span class="stability_3"><a href="#global"><code>global</code></a></span></li>
<li><span class="stability_1"><a href="#class-headers">Class <code>Headers</code></a></span></li>
<li><a href="#messagechannel"><code>MessageChannel</code></a></li>
<li><a href="#messageevent"><code>MessageEvent</code></a></li>
<li><a href="#messageport"><code>MessagePort</code></a></li>
<li><a href="#module"><code>module</code></a></li>
<li><a href="#performanceentry"><code>PerformanceEntry</code></a></li>
<li><a href="#performancemark"><code>PerformanceMark</code></a></li>
<li><a href="#performancemeasure"><code>PerformanceMeasure</code></a></li>
<li><a href="#performanceobserver"><code>PerformanceObserver</code></a></li>
<li><a href="#performanceobserverentrylist"><code>PerformanceObserverEntryList</code></a></li>
<li><a href="#performanceresourcetiming"><code>PerformanceResourceTiming</code></a></li>
<li><a href="#performance"><code>performance</code></a></li>
<li><a href="#process"><code>process</code></a></li>
<li><a href="#queuemicrotaskcallback"><code>queueMicrotask(callback)</code></a></li>
<li><span class="stability_1"><a href="#class-readablebytestreamcontroller">Class: <code>ReadableByteStreamController</code></a></span></li>
<li><span class="stability_1"><a href="#class-readablestream">Class: <code>ReadableStream</code></a></span></li>
<li><span class="stability_1"><a href="#class-readablestreambyobreader">Class: <code>ReadableStreamBYOBReader</code></a></span></li>
<li><span class="stability_1"><a href="#class-readablestreambyobrequest">Class: <code>ReadableStreamBYOBRequest</code></a></span></li>
<li><span class="stability_1"><a href="#class-readablestreamdefaultcontroller">Class: <code>ReadableStreamDefaultController</code></a></span></li>
<li><span class="stability_1"><a href="#class-readablestreamdefaultreader">Class: <code>ReadableStreamDefaultReader</code></a></span></li>
<li><a href="#require"><code>require()</code></a></li>
<li><span class="stability_1"><a href="#response"><code>Response</code></a></span></li>
<li><span class="stability_1"><a href="#request"><code>Request</code></a></span></li>
<li><a href="#setimmediatecallback-args"><code>setImmediate(callback[, ...args])</code></a></li>
<li><a href="#setintervalcallback-delay-args"><code>setInterval(callback, delay[, ...args])</code></a></li>
<li><a href="#settimeoutcallback-delay-args"><code>setTimeout(callback, delay[, ...args])</code></a></li>
<li><a href="#structuredclonevalue-options"><code>structuredClone(value[, options])</code></a></li>
<li><span class="stability_1"><a href="#subtlecrypto"><code>SubtleCrypto</code></a></span></li>
<li><a href="#domexception"><code>DOMException</code></a></li>
<li><a href="#textdecoder"><code>TextDecoder</code></a></li>
<li><span class="stability_1"><a href="#class-textdecoderstream">Class: <code>TextDecoderStream</code></a></span></li>
<li><a href="#textencoder"><code>TextEncoder</code></a></li>
<li><span class="stability_1"><a href="#class-textencoderstream">Class: <code>TextEncoderStream</code></a></span></li>
<li><span class="stability_1"><a href="#class-transformstream">Class: <code>TransformStream</code></a></span></li>
<li><span class="stability_1"><a href="#class-transformstreamdefaultcontroller">Class: <code>TransformStreamDefaultController</code></a></span></li>
<li><a href="#url"><code>URL</code></a></li>
<li><a href="#urlsearchparams"><code>URLSearchParams</code></a></li>
<li><a href="#webassembly"><code>WebAssembly</code></a></li>
<li><span class="stability_1"><a href="#websocket"><code>WebSocket</code></a></span></li>
<li><span class="stability_1"><a href="#class-writablestream">Class: <code>WritableStream</code></a></span></li>
<li><span class="stability_1"><a href="#class-writablestreamdefaultcontroller">Class: <code>WritableStreamDefaultController</code></a></span></li>
<li><span class="stability_1"><a href="#class-writablestreamdefaultwriter">Class: <code>WritableStreamDefaultWriter</code></a></span></li>
</ul>
</li>
</ul></details>
<div role="main" id="apicontent">
<h2>Global objects<span><a class="mark" href="#global-objects" id="global-objects">#</a></span><a aria-hidden="true" class="legacy" id="globals_global_objects"></a></h2>
<p>These objects are available in all modules.</p>
<p>The following variables may appear to be global but are not. They exist only in
the scope of <a href="modules.html">CommonJS modules</a>:</p>
<ul>
<li><a href="modules.html#__dirname"><code>__dirname</code></a></li>
<li><a href="modules.html#__filename"><code>__filename</code></a></li>
<li><a href="modules.html#exports"><code>exports</code></a></li>
<li><a href="modules.html#module"><code>module</code></a></li>
<li><a href="modules.html#requireid"><code>require()</code></a></li>
</ul>
<p>The objects listed here are specific to Node.js. There are <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects">built-in objects</a>
that are part of the JavaScript language itself, which are also globally
accessible.</p>
<section><h3>Class: <code>AbortController</code><span><a class="mark" href="#class-abortcontroller" id="class-abortcontroller">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_abortcontroller"></a></h3>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v15.4.0</td>
<td><p>No longer experimental.</p></td></tr>
<tr><td>v15.0.0, v14.17.0</td>
<td><p><span>Added in: v15.0.0, v14.17.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<p>A utility class used to signal cancelation in selected <code>Promise</code>-based APIs.
The API is based on the Web API <a href="https://developer.mozilla.org/en-US/docs/Web/API/AbortController"><code>AbortController</code></a>.</p>
<pre><code class="language-js"><span class="hljs-keyword">const</span> ac = <span class="hljs-keyword">new</span> <span class="hljs-title class_">AbortController</span>();
ac.<span class="hljs-property">signal</span>.<span class="hljs-title function_">addEventListener</span>(<span class="hljs-string">'abort'</span>, <span class="hljs-function">() =></span> <span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-string">'Aborted!'</span>),
{ <span class="hljs-attr">once</span>: <span class="hljs-literal">true</span> });
ac.<span class="hljs-title function_">abort</span>();
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(ac.<span class="hljs-property">signal</span>.<span class="hljs-property">aborted</span>); <span class="hljs-comment">// Prints true</span></code> <button class="copy-button">copy</button></pre>
<h4><code>abortController.abort([reason])</code><span><a class="mark" href="#abortcontrollerabortreason" id="abortcontrollerabortreason">#</a></span><a aria-hidden="true" class="legacy" id="globals_abortcontroller_abort_reason"></a></h4>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v17.2.0, v16.14.0</td>
<td><p>Added the new optional reason argument.</p></td></tr>
<tr><td>v15.0.0, v14.17.0</td>
<td><p><span>Added in: v15.0.0, v14.17.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<ul>
<li><code>reason</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Data_types" class="type"><any></a> An optional reason, retrievable on the <code>AbortSignal</code>'s
<code>reason</code> property.</li>
</ul>
<p>Triggers the abort signal, causing the <code>abortController.signal</code> to emit
the <code>'abort'</code> event.</p>
<h4><code>abortController.signal</code><span><a class="mark" href="#abortcontrollersignal" id="abortcontrollersignal">#</a></span><a aria-hidden="true" class="legacy" id="globals_abortcontroller_signal"></a></h4>
<div class="api_metadata">
<span>Added in: v15.0.0, v14.17.0</span>
</div>
<ul>
<li>Type: <a href="globals.html#class-abortsignal" class="type"><AbortSignal></a></li>
</ul>
<h4>Class: <code>AbortSignal</code><span><a class="mark" href="#class-abortsignal" id="class-abortsignal">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_abortsignal"></a></h4>
<div class="api_metadata">
<span>Added in: v15.0.0, v14.17.0</span>
</div>
<ul>
<li>Extends: <a href="events.html#class-eventtarget" class="type"><EventTarget></a></li>
</ul>
<p>The <code>AbortSignal</code> is used to notify observers when the
<code>abortController.abort()</code> method is called.</p>
<h5>Static method: <code>AbortSignal.abort([reason])</code><span><a class="mark" href="#static-method-abortsignalabortreason" id="static-method-abortsignalabortreason">#</a></span><a aria-hidden="true" class="legacy" id="globals_static_method_abortsignal_abort_reason"></a></h5>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v17.2.0, v16.14.0</td>
<td><p>Added the new optional reason argument.</p></td></tr>
<tr><td>v15.12.0, v14.17.0</td>
<td><p><span>Added in: v15.12.0, v14.17.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<ul>
<li><code>reason</code>: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Data_types" class="type"><any></a></li>
<li>Returns: <a href="globals.html#class-abortsignal" class="type"><AbortSignal></a></li>
</ul>
<p>Returns a new already aborted <code>AbortSignal</code>.</p>
<h5>Static method: <code>AbortSignal.timeout(delay)</code><span><a class="mark" href="#static-method-abortsignaltimeoutdelay" id="static-method-abortsignaltimeoutdelay">#</a></span><a aria-hidden="true" class="legacy" id="globals_static_method_abortsignal_timeout_delay"></a></h5>
<div class="api_metadata">
<span>Added in: v17.3.0, v16.14.0</span>
</div>
<ul>
<li><code>delay</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type" class="type"><number></a> The number of milliseconds to wait before triggering
the AbortSignal.</li>
</ul>
<p>Returns a new <code>AbortSignal</code> which will be aborted in <code>delay</code> milliseconds.</p>
<h5>Static method: <code>AbortSignal.any(signals)</code><span><a class="mark" href="#static-method-abortsignalanysignals" id="static-method-abortsignalanysignals">#</a></span><a aria-hidden="true" class="legacy" id="globals_static_method_abortsignal_any_signals"></a></h5>
<div class="api_metadata">
<span>Added in: v20.3.0</span>
</div>
<ul>
<li><code>signals</code> <a href="globals.html#class-abortsignal" class="type"><AbortSignal[]></a> The <code>AbortSignal</code>s of which to compose a new <code>AbortSignal</code>.</li>
</ul>
<p>Returns a new <code>AbortSignal</code> which will be aborted if any of the provided
signals are aborted. Its <a href="#abortsignalreason"><code>abortSignal.reason</code></a> will be set to whichever
one of the <code>signals</code> caused it to be aborted.</p>
<h5>Event: <code>'abort'</code><span><a class="mark" href="#event-abort" id="event-abort">#</a></span><a aria-hidden="true" class="legacy" id="globals_event_abort"></a></h5>
<div class="api_metadata">
<span>Added in: v15.0.0, v14.17.0</span>
</div>
<p>The <code>'abort'</code> event is emitted when the <code>abortController.abort()</code> method
is called. The callback is invoked with a single object argument with a
single <code>type</code> property set to <code>'abort'</code>:</p>
<pre><code class="language-js"><span class="hljs-keyword">const</span> ac = <span class="hljs-keyword">new</span> <span class="hljs-title class_">AbortController</span>();
<span class="hljs-comment">// Use either the onabort property...</span>
ac.<span class="hljs-property">signal</span>.<span class="hljs-property">onabort</span> = <span class="hljs-function">() =></span> <span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-string">'aborted!'</span>);
<span class="hljs-comment">// Or the EventTarget API...</span>
ac.<span class="hljs-property">signal</span>.<span class="hljs-title function_">addEventListener</span>(<span class="hljs-string">'abort'</span>, <span class="hljs-function">(<span class="hljs-params">event</span>) =></span> {
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(event.<span class="hljs-property">type</span>); <span class="hljs-comment">// Prints 'abort'</span>
}, { <span class="hljs-attr">once</span>: <span class="hljs-literal">true</span> });
ac.<span class="hljs-title function_">abort</span>();</code> <button class="copy-button">copy</button></pre>
<p>The <code>AbortController</code> with which the <code>AbortSignal</code> is associated will only
ever trigger the <code>'abort'</code> event once. We recommended that code check
that the <code>abortSignal.aborted</code> attribute is <code>false</code> before adding an <code>'abort'</code>
event listener.</p>
<p>Any event listeners attached to the <code>AbortSignal</code> should use the
<code>{ once: true }</code> option (or, if using the <code>EventEmitter</code> APIs to attach a
listener, use the <code>once()</code> method) to ensure that the event listener is
removed as soon as the <code>'abort'</code> event is handled. Failure to do so may
result in memory leaks.</p>
<h5><code>abortSignal.aborted</code><span><a class="mark" href="#abortsignalaborted" id="abortsignalaborted">#</a></span><a aria-hidden="true" class="legacy" id="globals_abortsignal_aborted"></a></h5>
<div class="api_metadata">
<span>Added in: v15.0.0, v14.17.0</span>
</div>
<ul>
<li>Type: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type" class="type"><boolean></a> True after the <code>AbortController</code> has been aborted.</li>
</ul>
<h5><code>abortSignal.onabort</code><span><a class="mark" href="#abortsignalonabort" id="abortsignalonabort">#</a></span><a aria-hidden="true" class="legacy" id="globals_abortsignal_onabort"></a></h5>
<div class="api_metadata">
<span>Added in: v15.0.0, v14.17.0</span>
</div>
<ul>
<li>Type: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function" class="type"><Function></a></li>
</ul>
<p>An optional callback function that may be set by user code to be notified
when the <code>abortController.abort()</code> function has been called.</p>
<h5><code>abortSignal.reason</code><span><a class="mark" href="#abortsignalreason" id="abortsignalreason">#</a></span><a aria-hidden="true" class="legacy" id="globals_abortsignal_reason"></a></h5>
<div class="api_metadata">
<span>Added in: v17.2.0, v16.14.0</span>
</div>
<ul>
<li>Type: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Data_types" class="type"><any></a></li>
</ul>
<p>An optional reason specified when the <code>AbortSignal</code> was triggered.</p>
<pre><code class="language-js"><span class="hljs-keyword">const</span> ac = <span class="hljs-keyword">new</span> <span class="hljs-title class_">AbortController</span>();
ac.<span class="hljs-title function_">abort</span>(<span class="hljs-keyword">new</span> <span class="hljs-title class_">Error</span>(<span class="hljs-string">'boom!'</span>));
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(ac.<span class="hljs-property">signal</span>.<span class="hljs-property">reason</span>); <span class="hljs-comment">// Error: boom!</span></code> <button class="copy-button">copy</button></pre>
<h5><code>abortSignal.throwIfAborted()</code><span><a class="mark" href="#abortsignalthrowifaborted" id="abortsignalthrowifaborted">#</a></span><a aria-hidden="true" class="legacy" id="globals_abortsignal_throwifaborted"></a></h5>
<div class="api_metadata">
<span>Added in: v17.3.0, v16.17.0</span>
</div>
<p>If <code>abortSignal.aborted</code> is <code>true</code>, throws <code>abortSignal.reason</code>.</p>
</section><section><h3>Class: <code>Blob</code><span><a class="mark" href="#class-blob" id="class-blob">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_blob"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p>See <a href="buffer.html#class-blob" class="type"><Blob></a>.</p>
</section><section><h3>Class: <code>Buffer</code><span><a class="mark" href="#class-buffer" id="class-buffer">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_buffer"></a></h3>
<div class="api_metadata">
<span>Added in: v0.1.103</span>
</div>
<ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function" class="type"><Function></a></li>
</ul>
<p>Used to handle binary data. See the <a href="buffer.html">buffer section</a>.</p>
</section><section><h3>Class: <code>ByteLengthQueuingStrategy</code><span><a class="mark" href="#class-bytelengthqueuingstrategy" id="class-bytelengthqueuingstrategy">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_bytelengthqueuingstrategy"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-bytelengthqueuingstrategy"><code>ByteLengthQueuingStrategy</code></a>.</p>
</section><section><h3><code>__dirname</code><span><a class="mark" href="#__dirname" id="__dirname">#</a></span><a aria-hidden="true" class="legacy" id="globals_dirname"></a></h3>
<p>This variable may appear to be global but is not. See <a href="modules.html#__dirname"><code>__dirname</code></a>.</p>
</section><section><h3><code>__filename</code><span><a class="mark" href="#__filename" id="__filename">#</a></span><a aria-hidden="true" class="legacy" id="globals_filename"></a></h3>
<p>This variable may appear to be global but is not. See <a href="modules.html#__filename"><code>__filename</code></a>.</p>
</section><section><h3><code>atob(data)</code><span><a class="mark" href="#atobdata" id="atobdata">#</a></span><a aria-hidden="true" class="legacy" id="globals_atob_data"></a></h3>
<div class="api_metadata">
<span>Added in: v16.0.0</span>
</div>
<p></p><div class="api_stability api_stability_3"><a href="documentation.html#stability-index">Stability: 3</a> - Legacy. Use <code>Buffer.from(data, 'base64')</code> instead.</div><p></p>
<p>Global alias for <a href="buffer.html#bufferatobdata"><code>buffer.atob()</code></a>.</p>
</section><section><h3><code>BroadcastChannel</code><span><a class="mark" href="#broadcastchannel" id="broadcastchannel">#</a></span><a aria-hidden="true" class="legacy" id="globals_broadcastchannel"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p>See <a href="worker_threads.html#class-broadcastchannel-extends-eventtarget" class="type"><BroadcastChannel></a>.</p>
</section><section><h3><code>btoa(data)</code><span><a class="mark" href="#btoadata" id="btoadata">#</a></span><a aria-hidden="true" class="legacy" id="globals_btoa_data"></a></h3>
<div class="api_metadata">
<span>Added in: v16.0.0</span>
</div>
<p></p><div class="api_stability api_stability_3"><a href="documentation.html#stability-index">Stability: 3</a> - Legacy. Use <code>buf.toString('base64')</code> instead.</div><p></p>
<p>Global alias for <a href="buffer.html#bufferbtoadata"><code>buffer.btoa()</code></a>.</p>
</section><section><h3><code>clearImmediate(immediateObject)</code><span><a class="mark" href="#clearimmediateimmediateobject" id="clearimmediateimmediateobject">#</a></span><a aria-hidden="true" class="legacy" id="globals_clearimmediate_immediateobject"></a></h3>
<div class="api_metadata">
<span>Added in: v0.9.1</span>
</div>
<p><a href="timers.html#clearimmediateimmediate"><code>clearImmediate</code></a> is described in the <a href="timers.html">timers</a> section.</p>
</section><section><h3><code>clearInterval(intervalObject)</code><span><a class="mark" href="#clearintervalintervalobject" id="clearintervalintervalobject">#</a></span><a aria-hidden="true" class="legacy" id="globals_clearinterval_intervalobject"></a></h3>
<div class="api_metadata">
<span>Added in: v0.0.1</span>
</div>
<p><a href="timers.html#clearintervaltimeout"><code>clearInterval</code></a> is described in the <a href="timers.html">timers</a> section.</p>
</section><section><h3><code>clearTimeout(timeoutObject)</code><span><a class="mark" href="#cleartimeouttimeoutobject" id="cleartimeouttimeoutobject">#</a></span><a aria-hidden="true" class="legacy" id="globals_cleartimeout_timeoutobject"></a></h3>
<div class="api_metadata">
<span>Added in: v0.0.1</span>
</div>
<p><a href="timers.html#cleartimeouttimeout"><code>clearTimeout</code></a> is described in the <a href="timers.html">timers</a> section.</p>
</section><section><h3>Class: <code>CompressionStream</code><span><a class="mark" href="#class-compressionstream" id="class-compressionstream">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_compressionstream"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-compressionstream"><code>CompressionStream</code></a>.</p>
</section><section><h3><code>console</code><span><a class="mark" href="#console" id="console">#</a></span><a aria-hidden="true" class="legacy" id="globals_console"></a></h3>
<div class="api_metadata">
<span>Added in: v0.1.100</span>
</div>
<ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object" class="type"><Object></a></li>
</ul>
<p>Used to print to stdout and stderr. See the <a href="console.html"><code>console</code></a> section.</p>
</section><section><h3>Class: <code>CountQueuingStrategy</code><span><a class="mark" href="#class-countqueuingstrategy" id="class-countqueuingstrategy">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_countqueuingstrategy"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-countqueuingstrategy"><code>CountQueuingStrategy</code></a>.</p>
</section><section><h3><code>Crypto</code><span><a class="mark" href="#crypto" id="crypto">#</a></span><a aria-hidden="true" class="legacy" id="globals_crypto"></a></h3>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v19.0.0</td>
<td><p>No longer behind <code>--experimental-global-webcrypto</code> CLI flag.</p></td></tr>
<tr><td>v17.6.0, v16.15.0</td>
<td><p><span>Added in: v17.6.0, v16.15.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental. Disable this API with the
<a href="cli.html#--no-experimental-global-webcrypto"><code>--no-experimental-global-webcrypto</code></a> CLI flag.</div><p></p>
<p>A browser-compatible implementation of <a href="webcrypto.html#class-crypto" class="type"><Crypto></a>. This global is available
only if the Node.js binary was compiled with including support for the
<code>node:crypto</code> module.</p>
</section><section><h3><code>crypto</code><span><a class="mark" href="#crypto_1" id="crypto_1">#</a></span><a aria-hidden="true" class="legacy" id="globals_crypto_1"></a></h3>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v19.0.0</td>
<td><p>No longer behind <code>--experimental-global-webcrypto</code> CLI flag.</p></td></tr>
<tr><td>v17.6.0, v16.15.0</td>
<td><p><span>Added in: v17.6.0, v16.15.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental. Disable this API with the
<a href="cli.html#--no-experimental-global-webcrypto"><code>--no-experimental-global-webcrypto</code></a> CLI flag.</div><p></p>
<p>A browser-compatible implementation of the <a href="webcrypto.html">Web Crypto API</a>.</p>
</section><section><h3><code>CryptoKey</code><span><a class="mark" href="#cryptokey" id="cryptokey">#</a></span><a aria-hidden="true" class="legacy" id="globals_cryptokey"></a></h3>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v19.0.0</td>
<td><p>No longer behind <code>--experimental-global-webcrypto</code> CLI flag.</p></td></tr>
<tr><td>v17.6.0, v16.15.0</td>
<td><p><span>Added in: v17.6.0, v16.15.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental. Disable this API with the
<a href="cli.html#--no-experimental-global-webcrypto"><code>--no-experimental-global-webcrypto</code></a> CLI flag.</div><p></p>
<p>A browser-compatible implementation of <a href="webcrypto.html#class-cryptokey" class="type"><CryptoKey></a>. This global is available
only if the Node.js binary was compiled with including support for the
<code>node:crypto</code> module.</p>
</section><section><h3><code>CustomEvent</code><span><a class="mark" href="#customevent" id="customevent">#</a></span><a aria-hidden="true" class="legacy" id="globals_customevent"></a></h3>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v19.0.0</td>
<td><p>No longer behind <code>--experimental-global-customevent</code> CLI flag.</p></td></tr>
<tr><td>v18.7.0, v16.17.0</td>
<td><p><span>Added in: v18.7.0, v16.17.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental. Disable this API with the
<a href="cli.html#--no-experimental-global-customevent"><code>--no-experimental-global-customevent</code></a> CLI flag.</div><p></p>
<p>A browser-compatible implementation of the <a href="https://dom.spec.whatwg.org/#customevent"><code>CustomEvent</code> Web API</a>.</p>
</section><section><h3>Class: <code>DecompressionStream</code><span><a class="mark" href="#class-decompressionstream" id="class-decompressionstream">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_decompressionstream"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-decompressionstream"><code>DecompressionStream</code></a>.</p>
</section><section><h3><code>Event</code><span><a class="mark" href="#event" id="event">#</a></span><a aria-hidden="true" class="legacy" id="globals_event"></a></h3>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v15.4.0</td>
<td><p>No longer experimental.</p></td></tr>
<tr><td>v15.0.0</td>
<td><p><span>Added in: v15.0.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<p>A browser-compatible implementation of the <code>Event</code> class. See
<a href="events.html#eventtarget-and-event-api"><code>EventTarget</code> and <code>Event</code> API</a> for more details.</p>
</section><section><h3><code>EventSource</code><span><a class="mark" href="#eventsource" id="eventsource">#</a></span><a aria-hidden="true" class="legacy" id="globals_eventsource"></a></h3>
<div class="api_metadata">
<span>Added in: v20.18.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental. Enable this API with the <a href="cli.html#--experimental-eventsource"><code>--experimental-eventsource</code></a>
CLI flag.</div><p></p>
<p>A browser-compatible implementation of the <a href="https://developer.mozilla.org/en-US/docs/Web/API/EventSource"><code>EventSource</code></a> class.</p>
</section><section><h3><code>EventTarget</code><span><a class="mark" href="#eventtarget" id="eventtarget">#</a></span><a aria-hidden="true" class="legacy" id="globals_eventtarget"></a></h3>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v15.4.0</td>
<td><p>No longer experimental.</p></td></tr>
<tr><td>v15.0.0</td>
<td><p><span>Added in: v15.0.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<p>A browser-compatible implementation of the <code>EventTarget</code> class. See
<a href="events.html#eventtarget-and-event-api"><code>EventTarget</code> and <code>Event</code> API</a> for more details.</p>
</section><section><h3><code>exports</code><span><a class="mark" href="#exports" id="exports">#</a></span><a aria-hidden="true" class="legacy" id="globals_exports"></a></h3>
<p>This variable may appear to be global but is not. See <a href="modules.html#exports"><code>exports</code></a>.</p>
</section><section><h3><code>fetch</code><span><a class="mark" href="#fetch" id="fetch">#</a></span><a aria-hidden="true" class="legacy" id="globals_fetch"></a></h3>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v18.0.0</td>
<td><p>No longer behind <code>--experimental-fetch</code> CLI flag.</p></td></tr>
<tr><td>v17.5.0, v16.15.0</td>
<td><p><span>Added in: v17.5.0, v16.15.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental. Disable this API with the <a href="cli.html#--no-experimental-fetch"><code>--no-experimental-fetch</code></a>
CLI flag.</div><p></p>
<p>A browser-compatible implementation of the <a href="https://developer.mozilla.org/en-US/docs/Web/API/fetch"><code>fetch()</code></a> function.</p>
</section><section><h3>Class: <code>File</code><span><a class="mark" href="#class-file" id="class-file">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_file"></a></h3>
<div class="api_metadata">
<span>Added in: v20.0.0</span>
</div>
<p>See <a href="buffer.html#class-file" class="type"><File></a>.</p>
</section><section><h3>Class <code>FormData</code><span><a class="mark" href="#class-formdata" id="class-formdata">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_formdata"></a></h3>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v18.0.0</td>
<td><p>No longer behind <code>--experimental-fetch</code> CLI flag.</p></td></tr>
<tr><td>v17.6.0, v16.15.0</td>
<td><p><span>Added in: v17.6.0, v16.15.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental. Disable this API with the <a href="cli.html#--no-experimental-fetch"><code>--no-experimental-fetch</code></a>
CLI flag.</div><p></p>
<p>A browser-compatible implementation of <a href="https://developer.mozilla.org/en-US/docs/Web/API/FormData" class="type"><FormData></a>.</p>
</section><section><h3><code>global</code><span><a class="mark" href="#global" id="global">#</a></span><a aria-hidden="true" class="legacy" id="globals_global"></a></h3>
<div class="api_metadata">
<span>Added in: v0.1.27</span>
</div>
<p></p><div class="api_stability api_stability_3"><a href="documentation.html#stability-index">Stability: 3</a> - Legacy. Use <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/globalThis"><code>globalThis</code></a> instead.</div><p></p>
<ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object" class="type"><Object></a> The global namespace object.</li>
</ul>
<p>In browsers, the top-level scope has traditionally been the global scope. This
means that <code>var something</code> will define a new global variable, except within
ECMAScript modules. In Node.js, this is different. The top-level scope is not
the global scope; <code>var something</code> inside a Node.js module will be local to that
module, regardless of whether it is a <a href="modules.html">CommonJS module</a> or an
<a href="esm.html">ECMAScript module</a>.</p>
</section><section><h3>Class <code>Headers</code><span><a class="mark" href="#class-headers" id="class-headers">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_headers"></a></h3>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v18.0.0</td>
<td><p>No longer behind <code>--experimental-fetch</code> CLI flag.</p></td></tr>
<tr><td>v17.5.0, v16.15.0</td>
<td><p><span>Added in: v17.5.0, v16.15.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental. Disable this API with the <a href="cli.html#--no-experimental-fetch"><code>--no-experimental-fetch</code></a>
CLI flag.</div><p></p>
<p>A browser-compatible implementation of <a href="https://developer.mozilla.org/en-US/docs/Web/API/Headers" class="type"><Headers></a>.</p>
</section><section><h3><code>MessageChannel</code><span><a class="mark" href="#messagechannel" id="messagechannel">#</a></span><a aria-hidden="true" class="legacy" id="globals_messagechannel"></a></h3>
<div class="api_metadata">
<span>Added in: v15.0.0</span>
</div>
<p>The <code>MessageChannel</code> class. See <a href="worker_threads.html#class-messagechannel"><code>MessageChannel</code></a> for more details.</p>
</section><section><h3><code>MessageEvent</code><span><a class="mark" href="#messageevent" id="messageevent">#</a></span><a aria-hidden="true" class="legacy" id="globals_messageevent"></a></h3>
<div class="api_metadata">
<span>Added in: v15.0.0</span>
</div>
<p>The <code>MessageEvent</code> class. See <a href="https://developer.mozilla.org/en-US/docs/Web/API/MessageEvent/MessageEvent"><code>MessageEvent</code></a> for more details.</p>
</section><section><h3><code>MessagePort</code><span><a class="mark" href="#messageport" id="messageport">#</a></span><a aria-hidden="true" class="legacy" id="globals_messageport"></a></h3>
<div class="api_metadata">
<span>Added in: v15.0.0</span>
</div>
<p>The <code>MessagePort</code> class. See <a href="worker_threads.html#class-messageport"><code>MessagePort</code></a> for more details.</p>
</section><section><h3><code>module</code><span><a class="mark" href="#module" id="module">#</a></span><a aria-hidden="true" class="legacy" id="globals_module"></a></h3>
<p>This variable may appear to be global but is not. See <a href="modules.html#module"><code>module</code></a>.</p>
</section><section><h3><code>PerformanceEntry</code><span><a class="mark" href="#performanceentry" id="performanceentry">#</a></span><a aria-hidden="true" class="legacy" id="globals_performanceentry"></a></h3>
<div class="api_metadata">
<span>Added in: v19.0.0</span>
</div>
<p>The <code>PerformanceEntry</code> class. See <a href="perf_hooks.html#class-performanceentry"><code>PerformanceEntry</code></a> for more details.</p>
</section><section><h3><code>PerformanceMark</code><span><a class="mark" href="#performancemark" id="performancemark">#</a></span><a aria-hidden="true" class="legacy" id="globals_performancemark"></a></h3>
<div class="api_metadata">
<span>Added in: v19.0.0</span>
</div>
<p>The <code>PerformanceMark</code> class. See <a href="perf_hooks.html#class-performancemark"><code>PerformanceMark</code></a> for more details.</p>
</section><section><h3><code>PerformanceMeasure</code><span><a class="mark" href="#performancemeasure" id="performancemeasure">#</a></span><a aria-hidden="true" class="legacy" id="globals_performancemeasure"></a></h3>
<div class="api_metadata">
<span>Added in: v19.0.0</span>
</div>
<p>The <code>PerformanceMeasure</code> class. See <a href="perf_hooks.html#class-performancemeasure"><code>PerformanceMeasure</code></a> for more details.</p>
</section><section><h3><code>PerformanceObserver</code><span><a class="mark" href="#performanceobserver" id="performanceobserver">#</a></span><a aria-hidden="true" class="legacy" id="globals_performanceobserver"></a></h3>
<div class="api_metadata">
<span>Added in: v19.0.0</span>
</div>
<p>The <code>PerformanceObserver</code> class. See <a href="perf_hooks.html#class-performanceobserver"><code>PerformanceObserver</code></a> for more details.</p>
</section><section><h3><code>PerformanceObserverEntryList</code><span><a class="mark" href="#performanceobserverentrylist" id="performanceobserverentrylist">#</a></span><a aria-hidden="true" class="legacy" id="globals_performanceobserverentrylist"></a></h3>
<div class="api_metadata">
<span>Added in: v19.0.0</span>
</div>
<p>The <code>PerformanceObserverEntryList</code> class. See
<a href="perf_hooks.html#class-performanceobserverentrylist"><code>PerformanceObserverEntryList</code></a> for more details.</p>
</section><section><h3><code>PerformanceResourceTiming</code><span><a class="mark" href="#performanceresourcetiming" id="performanceresourcetiming">#</a></span><a aria-hidden="true" class="legacy" id="globals_performanceresourcetiming"></a></h3>
<div class="api_metadata">
<span>Added in: v19.0.0</span>
</div>
<p>The <code>PerformanceResourceTiming</code> class. See <a href="perf_hooks.html#class-performanceresourcetiming"><code>PerformanceResourceTiming</code></a> for
more details.</p>
</section><section><h3><code>performance</code><span><a class="mark" href="#performance" id="performance">#</a></span><a aria-hidden="true" class="legacy" id="globals_performance"></a></h3>
<div class="api_metadata">
<span>Added in: v16.0.0</span>
</div>
<p>The <a href="perf_hooks.html#perf_hooksperformance"><code>perf_hooks.performance</code></a> object.</p>
</section><section><h3><code>process</code><span><a class="mark" href="#process" id="process">#</a></span><a aria-hidden="true" class="legacy" id="globals_process"></a></h3>
<div class="api_metadata">
<span>Added in: v0.1.7</span>
</div>
<ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object" class="type"><Object></a></li>
</ul>
<p>The process object. See the <a href="process.html#process"><code>process</code> object</a> section.</p>
</section><section><h3><code>queueMicrotask(callback)</code><span><a class="mark" href="#queuemicrotaskcallback" id="queuemicrotaskcallback">#</a></span><a aria-hidden="true" class="legacy" id="globals_queuemicrotask_callback"></a></h3>
<div class="api_metadata">
<span>Added in: v11.0.0</span>
</div>
<ul>
<li><code>callback</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function" class="type"><Function></a> Function to be queued.</li>
</ul>
<p>The <code>queueMicrotask()</code> method queues a microtask to invoke <code>callback</code>. If
<code>callback</code> throws an exception, the <a href="process.html#process"><code>process</code> object</a> <code>'uncaughtException'</code>
event will be emitted.</p>
<p>The microtask queue is managed by V8 and may be used in a similar manner to
the <a href="process.html#processnexttickcallback-args"><code>process.nextTick()</code></a> queue, which is managed by Node.js. The
<code>process.nextTick()</code> queue is always processed before the microtask queue
within each turn of the Node.js event loop.</p>
<pre><code class="language-js"><span class="hljs-comment">// Here, `queueMicrotask()` is used to ensure the 'load' event is always</span>
<span class="hljs-comment">// emitted asynchronously, and therefore consistently. Using</span>
<span class="hljs-comment">// `process.nextTick()` here would result in the 'load' event always emitting</span>
<span class="hljs-comment">// before any other promise jobs.</span>
<span class="hljs-title class_">DataHandler</span>.<span class="hljs-property"><span class="hljs-keyword">prototype</span></span>.<span class="hljs-property">load</span> = <span class="hljs-keyword">async</span> <span class="hljs-keyword">function</span> <span class="hljs-title function_">load</span>(<span class="hljs-params">key</span>) {
<span class="hljs-keyword">const</span> hit = <span class="hljs-variable language_">this</span>.<span class="hljs-property">_cache</span>.<span class="hljs-title function_">get</span>(key);
<span class="hljs-keyword">if</span> (hit !== <span class="hljs-literal">undefined</span>) {
<span class="hljs-title function_">queueMicrotask</span>(<span class="hljs-function">() =></span> {
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">emit</span>(<span class="hljs-string">'load'</span>, hit);
});
<span class="hljs-keyword">return</span>;
}
<span class="hljs-keyword">const</span> data = <span class="hljs-keyword">await</span> <span class="hljs-title function_">fetchData</span>(key);
<span class="hljs-variable language_">this</span>.<span class="hljs-property">_cache</span>.<span class="hljs-title function_">set</span>(key, data);
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">emit</span>(<span class="hljs-string">'load'</span>, data);
};</code> <button class="copy-button">copy</button></pre>
</section><section><h3>Class: <code>ReadableByteStreamController</code><span><a class="mark" href="#class-readablebytestreamcontroller" id="class-readablebytestreamcontroller">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_readablebytestreamcontroller"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-readablebytestreamcontroller"><code>ReadableByteStreamController</code></a>.</p>
</section><section><h3>Class: <code>ReadableStream</code><span><a class="mark" href="#class-readablestream" id="class-readablestream">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_readablestream"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-readablestream"><code>ReadableStream</code></a>.</p>
</section><section><h3>Class: <code>ReadableStreamBYOBReader</code><span><a class="mark" href="#class-readablestreambyobreader" id="class-readablestreambyobreader">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_readablestreambyobreader"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-readablestreambyobreader"><code>ReadableStreamBYOBReader</code></a>.</p>
</section><section><h3>Class: <code>ReadableStreamBYOBRequest</code><span><a class="mark" href="#class-readablestreambyobrequest" id="class-readablestreambyobrequest">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_readablestreambyobrequest"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-readablestreambyobrequest"><code>ReadableStreamBYOBRequest</code></a>.</p>
</section><section><h3>Class: <code>ReadableStreamDefaultController</code><span><a class="mark" href="#class-readablestreamdefaultcontroller" id="class-readablestreamdefaultcontroller">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_readablestreamdefaultcontroller"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-readablestreamdefaultcontroller"><code>ReadableStreamDefaultController</code></a>.</p>
</section><section><h3>Class: <code>ReadableStreamDefaultReader</code><span><a class="mark" href="#class-readablestreamdefaultreader" id="class-readablestreamdefaultreader">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_readablestreamdefaultreader"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-readablestreamdefaultreader"><code>ReadableStreamDefaultReader</code></a>.</p>
</section><section><h3><code>require()</code><span><a class="mark" href="#require" id="require">#</a></span><a aria-hidden="true" class="legacy" id="globals_require"></a></h3>
<p>This variable may appear to be global but is not. See <a href="modules.html#requireid"><code>require()</code></a>.</p>
</section><section><h3><code>Response</code><span><a class="mark" href="#response" id="response">#</a></span><a aria-hidden="true" class="legacy" id="globals_response"></a></h3>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v18.0.0</td>
<td><p>No longer behind <code>--experimental-fetch</code> CLI flag.</p></td></tr>
<tr><td>v17.5.0, v16.15.0</td>
<td><p><span>Added in: v17.5.0, v16.15.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental. Disable this API with the <a href="cli.html#--no-experimental-fetch"><code>--no-experimental-fetch</code></a>
CLI flag.</div><p></p>
<p>A browser-compatible implementation of <a href="https://developer.mozilla.org/en-US/docs/Web/API/Response" class="type"><Response></a>.</p>
</section><section><h3><code>Request</code><span><a class="mark" href="#request" id="request">#</a></span><a aria-hidden="true" class="legacy" id="globals_request"></a></h3>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v18.0.0</td>
<td><p>No longer behind <code>--experimental-fetch</code> CLI flag.</p></td></tr>
<tr><td>v17.5.0, v16.15.0</td>
<td><p><span>Added in: v17.5.0, v16.15.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental. Disable this API with the <a href="cli.html#--no-experimental-fetch"><code>--no-experimental-fetch</code></a>
CLI flag.</div><p></p>
<p>A browser-compatible implementation of <a href="https://developer.mozilla.org/en-US/docs/Web/API/Request" class="type"><Request></a>.</p>
</section><section><h3><code>setImmediate(callback[, ...args])</code><span><a class="mark" href="#setimmediatecallback-args" id="setimmediatecallback-args">#</a></span><a aria-hidden="true" class="legacy" id="globals_setimmediate_callback_args"></a></h3>
<div class="api_metadata">
<span>Added in: v0.9.1</span>
</div>
<p><a href="timers.html#setimmediatecallback-args"><code>setImmediate</code></a> is described in the <a href="timers.html">timers</a> section.</p>
</section><section><h3><code>setInterval(callback, delay[, ...args])</code><span><a class="mark" href="#setintervalcallback-delay-args" id="setintervalcallback-delay-args">#</a></span><a aria-hidden="true" class="legacy" id="globals_setinterval_callback_delay_args"></a></h3>
<div class="api_metadata">
<span>Added in: v0.0.1</span>
</div>
<p><a href="timers.html#setintervalcallback-delay-args"><code>setInterval</code></a> is described in the <a href="timers.html">timers</a> section.</p>
</section><section><h3><code>setTimeout(callback, delay[, ...args])</code><span><a class="mark" href="#settimeoutcallback-delay-args" id="settimeoutcallback-delay-args">#</a></span><a aria-hidden="true" class="legacy" id="globals_settimeout_callback_delay_args"></a></h3>
<div class="api_metadata">
<span>Added in: v0.0.1</span>
</div>
<p><a href="timers.html#settimeoutcallback-delay-args"><code>setTimeout</code></a> is described in the <a href="timers.html">timers</a> section.</p>
</section><section><h3><code>structuredClone(value[, options])</code><span><a class="mark" href="#structuredclonevalue-options" id="structuredclonevalue-options">#</a></span><a aria-hidden="true" class="legacy" id="globals_structuredclone_value_options"></a></h3>
<div class="api_metadata">
<span>Added in: v17.0.0</span>
</div>
<p>The WHATWG <a href="https://developer.mozilla.org/en-US/docs/Web/API/structuredClone"><code>structuredClone</code></a> method.</p>
</section><section><h3><code>SubtleCrypto</code><span><a class="mark" href="#subtlecrypto" id="subtlecrypto">#</a></span><a aria-hidden="true" class="legacy" id="globals_subtlecrypto"></a></h3>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v19.0.0</td>
<td><p>No longer behind <code>--experimental-global-webcrypto</code> CLI flag.</p></td></tr>
<tr><td>v17.6.0, v16.15.0</td>
<td><p><span>Added in: v17.6.0, v16.15.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental. Disable this API with the
<a href="cli.html#--no-experimental-global-webcrypto"><code>--no-experimental-global-webcrypto</code></a> CLI flag.</div><p></p>
<p>A browser-compatible implementation of <a href="webcrypto.html#class-subtlecrypto" class="type"><SubtleCrypto></a>. This global is available
only if the Node.js binary was compiled with including support for the
<code>node:crypto</code> module.</p>
</section><section><h3><code>DOMException</code><span><a class="mark" href="#domexception" id="domexception">#</a></span><a aria-hidden="true" class="legacy" id="globals_domexception"></a></h3>
<div class="api_metadata">
<span>Added in: v17.0.0</span>
</div>
<p>The WHATWG <code>DOMException</code> class. See <a href="https://developer.mozilla.org/en-US/docs/Web/API/DOMException"><code>DOMException</code></a> for more details.</p>
</section><section><h3><code>TextDecoder</code><span><a class="mark" href="#textdecoder" id="textdecoder">#</a></span><a aria-hidden="true" class="legacy" id="globals_textdecoder"></a></h3>
<div class="api_metadata">
<span>Added in: v11.0.0</span>
</div>
<p>The WHATWG <code>TextDecoder</code> class. See the <a href="util.html#class-utiltextdecoder"><code>TextDecoder</code></a> section.</p>
</section><section><h3>Class: <code>TextDecoderStream</code><span><a class="mark" href="#class-textdecoderstream" id="class-textdecoderstream">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_textdecoderstream"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-textdecoderstream"><code>TextDecoderStream</code></a>.</p>
</section><section><h3><code>TextEncoder</code><span><a class="mark" href="#textencoder" id="textencoder">#</a></span><a aria-hidden="true" class="legacy" id="globals_textencoder"></a></h3>
<div class="api_metadata">
<span>Added in: v11.0.0</span>
</div>
<p>The WHATWG <code>TextEncoder</code> class. See the <a href="util.html#class-utiltextencoder"><code>TextEncoder</code></a> section.</p>
</section><section><h3>Class: <code>TextEncoderStream</code><span><a class="mark" href="#class-textencoderstream" id="class-textencoderstream">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_textencoderstream"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-textencoderstream"><code>TextEncoderStream</code></a>.</p>
</section><section><h3>Class: <code>TransformStream</code><span><a class="mark" href="#class-transformstream" id="class-transformstream">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_transformstream"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-transformstream"><code>TransformStream</code></a>.</p>
</section><section><h3>Class: <code>TransformStreamDefaultController</code><span><a class="mark" href="#class-transformstreamdefaultcontroller" id="class-transformstreamdefaultcontroller">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_transformstreamdefaultcontroller"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-transformstreamdefaultcontroller"><code>TransformStreamDefaultController</code></a>.</p>
</section><section><h3><code>URL</code><span><a class="mark" href="#url" id="url">#</a></span><a aria-hidden="true" class="legacy" id="globals_url"></a></h3>
<div class="api_metadata">
<span>Added in: v10.0.0</span>
</div>
<p>The WHATWG <code>URL</code> class. See the <a href="url.html#class-url"><code>URL</code></a> section.</p>
</section><section><h3><code>URLSearchParams</code><span><a class="mark" href="#urlsearchparams" id="urlsearchparams">#</a></span><a aria-hidden="true" class="legacy" id="globals_urlsearchparams"></a></h3>
<div class="api_metadata">
<span>Added in: v10.0.0</span>
</div>
<p>The WHATWG <code>URLSearchParams</code> class. See the <a href="url.html#class-urlsearchparams"><code>URLSearchParams</code></a> section.</p>
</section><section><h3><code>WebAssembly</code><span><a class="mark" href="#webassembly" id="webassembly">#</a></span><a aria-hidden="true" class="legacy" id="globals_webassembly"></a></h3>
<div class="api_metadata">
<span>Added in: v8.0.0</span>
</div>
<ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object" class="type"><Object></a></li>
</ul>
<p>The object that acts as the namespace for all W3C
<a href="https://webassembly.org">WebAssembly</a> related functionality. See the
<a href="https://developer.mozilla.org/en-US/docs/WebAssembly">Mozilla Developer Network</a> for usage and compatibility.</p>
</section><section><h3><code>WebSocket</code><span><a class="mark" href="#websocket" id="websocket">#</a></span><a aria-hidden="true" class="legacy" id="globals_websocket"></a></h3>
<div class="api_metadata">
<span>Added in: v20.10.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="https://developer.mozilla.org/en-US/docs/Web/API/WebSocket"><code>WebSocket</code></a>. Enable this API
with the <a href="cli.html#--experimental-websocket"><code>--experimental-websocket</code></a> CLI flag.</p>
</section><section><h3>Class: <code>WritableStream</code><span><a class="mark" href="#class-writablestream" id="class-writablestream">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_writablestream"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-writablestream"><code>WritableStream</code></a>.</p>
</section><section><h3>Class: <code>WritableStreamDefaultController</code><span><a class="mark" href="#class-writablestreamdefaultcontroller" id="class-writablestreamdefaultcontroller">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_writablestreamdefaultcontroller"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-writablestreamdefaultcontroller"><code>WritableStreamDefaultController</code></a>.</p>
</section><section><h3>Class: <code>WritableStreamDefaultWriter</code><span><a class="mark" href="#class-writablestreamdefaultwriter" id="class-writablestreamdefaultwriter">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_writablestreamdefaultwriter"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-writablestreamdefaultwriter"><code>WritableStreamDefaultWriter</code></a>.</p></section>
<!-- API END -->
</div>
</div>
</div>
</body>
</html>