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<title data-rh="true">WebWorker class | Puppeteer</title><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:url" content="https://puppeteer.github.io/puppeteer/api/puppeteer.webworker"><meta data-rh="true" name="docusaurus_locale" content="en"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="docusaurus_version" content="current"><meta data-rh="true" name="docusaurus_tag" content="docs-default-current"><meta data-rh="true" name="docsearch:version" content="current"><meta data-rh="true" name="docsearch:docusaurus_tag" content="docs-default-current"><meta data-rh="true" property="og:title" content="WebWorker class | Puppeteer"><meta data-rh="true" name="description" content="The WebWorker class represents a WebWorker."><meta data-rh="true" property="og:description" content="The WebWorker class represents a WebWorker."><link data-rh="true" rel="icon" href="/puppeteer/img/favicon.ico"><link data-rh="true" rel="canonical" href="https://puppeteer.github.io/puppeteer/api/puppeteer.webworker"><link data-rh="true" rel="alternate" href="https://puppeteer.github.io/puppeteer/api/puppeteer.webworker" hreflang="en"><link data-rh="true" rel="alternate" href="https://puppeteer.github.io/puppeteer/api/puppeteer.webworker" hreflang="x-default"><link rel="stylesheet" href="/puppeteer/assets/css/styles.39576fb3.css">
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href="/puppeteer/api/puppeteer.puppeteererrors">puppeteererrors</a><button aria-label="Toggle the collapsible sidebar category &#x27;puppeteererrors&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/puppeteer/api/puppeteer.puppeteerlaunchoptions">puppeteerlaunchoptions</a><button aria-label="Toggle the collapsible sidebar category &#x27;puppeteerlaunchoptions&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/puppeteer/api/puppeteer.puppeteerlifecycleevent">puppeteerlifecycleevent</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/puppeteer/api/puppeteer.puppeteernode">puppeteernode</a><button aria-label="Toggle the collapsible sidebar category &#x27;puppeteernode&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/puppeteer/api/puppeteer.puppeteernodelaunchoptions">puppeteernodelaunchoptions</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/puppeteer/api/puppeteer.registercustomqueryhandler">registercustomqueryhandler</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/puppeteer/api/puppeteer.remoteaddress">remoteaddress</a><button aria-label="Toggle the collapsible sidebar category &#x27;remoteaddress&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/puppeteer/api/puppeteer.resourcetype">resourcetype</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/puppeteer/api/puppeteer.responseforrequest">responseforrequest</a><button aria-label="Toggle the collapsible sidebar category &#x27;responseforrequest&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/puppeteer/api/puppeteer.screenshotclip">screenshotclip</a><button aria-label="Toggle the collapsible sidebar category &#x27;screenshotclip&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/puppeteer/api/puppeteer.screenshotoptions">screenshotoptions</a><button aria-label="Toggle the collapsible sidebar category &#x27;screenshotoptions&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/puppeteer/api/puppeteer.securitydetails">securitydetails</a><button aria-label="Toggle the collapsible sidebar category &#x27;securitydetails&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/puppeteer/api/puppeteer.serializedaxnode">serializedaxnode</a><button aria-label="Toggle the collapsible sidebar category &#x27;serializedaxnode&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/puppeteer/api/puppeteer.snapshotoptions">snapshotoptions</a><button aria-label="Toggle the collapsible sidebar category &#x27;snapshotoptions&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/puppeteer/api/puppeteer.target">target</a><button aria-label="Toggle the collapsible sidebar category &#x27;target&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/puppeteer/api/puppeteer.targetfiltercallback">targetfiltercallback</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/puppeteer/api/puppeteer.timeouterror">timeouterror</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/puppeteer/api/puppeteer.touchscreen">touchscreen</a><button aria-label="Toggle the collapsible sidebar category &#x27;touchscreen&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/puppeteer/api/puppeteer.tracing">tracing</a><button aria-label="Toggle the collapsible sidebar category &#x27;tracing&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/puppeteer/api/puppeteer.tracingoptions">tracingoptions</a><button aria-label="Toggle the collapsible sidebar category &#x27;tracingoptions&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/puppeteer/api/puppeteer.unregistercustomqueryhandler">unregistercustomqueryhandler</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/puppeteer/api/puppeteer.viewport">viewport</a><button aria-label="Toggle the collapsible sidebar category &#x27;viewport&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/puppeteer/api/puppeteer.waitforoptions">waitforoptions</a><button aria-label="Toggle the collapsible sidebar category &#x27;waitforoptions&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/puppeteer/api/puppeteer.waitforselectoroptions">waitforselectoroptions</a><button aria-label="Toggle the collapsible sidebar category &#x27;waitforselectoroptions&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/puppeteer/api/puppeteer.waitfortargetoptions">waitfortargetoptions</a><button aria-label="Toggle the collapsible sidebar category &#x27;waitfortargetoptions&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/puppeteer/api/puppeteer.waittimeoutoptions">waittimeoutoptions</a><button aria-label="Toggle the collapsible sidebar category &#x27;waittimeoutoptions&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item"><div class="menu__list-item-collapsible menu__list-item-collapsible--active"><a class="menu__link menu__link--sublist menu__link--active" aria-current="page" aria-expanded="true" tabindex="0" href="/puppeteer/api/puppeteer.webworker">webworker</a><button aria-label="Toggle the collapsible sidebar category &#x27;webworker&#x27;" type="button" class="clean-btn menu__caret"></button></div><ul style="display:block;overflow:visible;height:auto" class="menu__list"><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/puppeteer/api/puppeteer.webworker.evaluate">evaluate</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/puppeteer/api/puppeteer.webworker.evaluatehandle">evaluatehandle</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/puppeteer/api/puppeteer.webworker.executioncontext">executioncontext</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/puppeteer/api/puppeteer.webworker.url">url</a></li></ul></li></ul></li></ul></nav></div></aside><main class="docMainContainer_gTbr"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_GujU"><div class="docItemContainer_Adtb"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/puppeteer/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_OVgt"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="/puppeteer/api/"><span itemprop="name">API</span></a><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">webworker</span><meta itemprop="position" content="2"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_aoJ5"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><h1>WebWorker class</h1><p>The WebWorker class represents a <a href="https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API" target="_blank" rel="noopener noreferrer">WebWorker</a>.</p><p><strong>Signature:</strong></p><div class="language-typescript codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-typescript codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#00009f">export</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">declare</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">class</span><span class="token plain"> </span><span class="token class-name">WebWorker</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">extends</span><span class="token plain"> </span><span class="token class-name">EventEmitter</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p><strong>Extends:</strong> <a href="/puppeteer/api/puppeteer.eventemitter">EventEmitter</a></p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="remarks">Remarks<a class="hash-link" href="#remarks" title="Direct link to heading"></a></h2><p>The events <code>workercreated</code> and <code>workerdestroyed</code> are emitted on the page object to signal the worker lifecycle.</p><p>The constructor for this class is marked as internal. Third-party code should not call the constructor directly or create subclasses that extend the <code>WebWorker</code> class.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="example">Example<a class="hash-link" href="#example" title="Direct link to heading"></a></h2><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-js codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">page</span><span class="token punctuation" style="color:#393A34">.</span><span class="token method function property-access" style="color:#d73a49">on</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#e3116c">&#x27;workercreated&#x27;</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token parameter">worker</span><span class="token plain"> </span><span class="token arrow operator" style="color:#393A34">=&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token console class-name">console</span><span class="token punctuation" style="color:#393A34">.</span><span class="token method function property-access" style="color:#d73a49">log</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#e3116c">&#x27;Worker created: &#x27;</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">+</span><span class="token plain"> worker</span><span class="token punctuation" style="color:#393A34">.</span><span class="token method function property-access" style="color:#d73a49">url</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">page</span><span class="token punctuation" style="color:#393A34">.</span><span class="token method function property-access" style="color:#d73a49">on</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#e3116c">&#x27;workerdestroyed&#x27;</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token parameter">worker</span><span class="token plain"> </span><span class="token arrow operator" style="color:#393A34">=&gt;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token console class-name">console</span><span class="token punctuation" style="color:#393A34">.</span><span class="token method function property-access" style="color:#d73a49">log</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#e3116c">&#x27;Worker destroyed: &#x27;</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">+</span><span class="token plain"> worker</span><span class="token punctuation" style="color:#393A34">.</span><span class="token method function property-access" style="color:#d73a49">url</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token console class-name">console</span><span class="token punctuation" style="color:#393A34">.</span><span class="token method function property-access" style="color:#d73a49">log</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#e3116c">&#x27;Current workers:&#x27;</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword control-flow" style="color:#00009f">for</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token keyword" style="color:#00009f">const</span><span class="token plain"> worker </span><span class="token keyword" style="color:#00009f">of</span><span class="token plain"> page</span><span class="token punctuation" style="color:#393A34">.</span><span class="token method function property-access" style="color:#d73a49">workers</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token console class-name">console</span><span class="token punctuation" style="color:#393A34">.</span><span class="token method function property-access" style="color:#d73a49">log</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#e3116c">&#x27; &#x27;</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">+</span><span class="token plain"> worker</span><span class="token punctuation" style="color:#393A34">.</span><span class="token method function property-access" style="color:#d73a49">url</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="methods">Methods<a class="hash-link" href="#methods" title="Direct link to heading"></a></h2><table><thead><tr><th>Method</th><th>Modifiers</th><th>Description</th></tr></thead><tbody><tr><td><a href="/puppeteer/api/puppeteer.webworker.evaluate">evaluate(pageFunction, args)</a></td><td></td><td>If the function passed to the <code>worker.evaluate</code> returns a Promise, then <code>worker.evaluate</code> would wait for the promise to resolve and return its value. If the function passed to the <code>worker.evaluate</code> returns a non-serializable value, then <code>worker.evaluate</code> resolves to <code>undefined</code>. DevTools Protocol also supports transferring some additional values that are not serializable by <code>JSON</code>: <code>-0</code>, <code>NaN</code>, <code>Infinity</code>, <code>-Infinity</code>, and bigint literals. Shortcut for <code>await worker.executionContext()).evaluate(pageFunction, ...args)</code>.</td></tr><tr><td><a href="/puppeteer/api/puppeteer.webworker.evaluatehandle">evaluateHandle(pageFunction, args)</a></td><td></td><td>The only difference between <code>worker.evaluate</code> and <code>worker.evaluateHandle</code> is that <code>worker.evaluateHandle</code> returns in-page object (JSHandle). If the function passed to the <code>worker.evaluateHandle</code> returns a <code>Promise</code>, then <code>worker.evaluateHandle</code> would wait for the promise to resolve and return its value. Shortcut for <code>await worker.executionContext()).evaluateHandle(pageFunction, ...args)</code></td></tr><tr><td><a href="/puppeteer/api/puppeteer.webworker.executioncontext">executionContext()</a></td><td></td><td>Returns the ExecutionContext the WebWorker runs in</td></tr><tr><td><a href="/puppeteer/api/puppeteer.webworker.url">url()</a></td><td></td><td></td></tr></tbody></table></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages navigation"><a class="pagination-nav__link pagination-nav__link--prev" href="/puppeteer/api/puppeteer.waittimeoutoptions.timeout"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">WaitTimeoutOptions.timeout property</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/puppeteer/api/puppeteer.webworker.evaluate"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">WebWorker.evaluate() method</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#remarks" class="table-of-contents__link toc-highlight">Remarks</a></li><li><a href="#example" class="table-of-contents__link toc-highlight">Example</a></li><li><a href="#methods" class="table-of-contents__link toc-highlight">Methods</a></li></ul></div></div></div></div></main></div></div><footer class="footer footer--dark"><div class="container container-fluid"><div class="row footer__links"><div class="col footer__col"><div class="footer__title">Community</div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://stackoverflow.com/questions/tagged/puppeteer" target="_blank" rel="noopener noreferrer" class="footer__link-item">Stack Overflow<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_lCJq"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li><li class="footer__item"><a href="https://twitter.com/chromedevtools" target="_blank" rel="noopener noreferrer" class="footer__link-item">Twitter<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_lCJq"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li><li class="footer__item"><a href="https://goo.gle/devtools-youtube" target="_blank" rel="noopener noreferrer" class="footer__link-item">YouTube<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_lCJq"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li></ul></div></div><div class="footer__bottom text--center"><div class="footer__copyright">Copyright © 2022 Google, Inc.</div></div></div></footer></div>
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