"use strict";(self.webpackChunkwebsite=self.webpackChunkwebsite||[]).push([[65574],{3905:(e,t,r)=>{r.d(t,{Zo:()=>s,kt:()=>c});var n=r(67294);function a(e,t,r){return t in e?Object.defineProperty(e,t,{value:r,enumerable:!0,configurable:!0,writable:!0}):e[t]=r,e}function l(e,t){var r=Object.keys(e);if(Object.getOwnPropertySymbols){var n=Object.getOwnPropertySymbols(e);t&&(n=n.filter((function(t){return Object.getOwnPropertyDescriptor(e,t).enumerable}))),r.push.apply(r,n)}return r}function i(e){for(var t=1;t<arguments.length;t++){var r=null!=arguments[t]?arguments[t]:{};t%2?l(Object(r),!0).forEach((function(t){a(e,t,r[t])})):Object.getOwnPropertyDescriptors?Object.defineProperties(e,Object.getOwnPropertyDescriptors(r)):l(Object(r)).forEach((function(t){Object.defineProperty(e,t,Object.getOwnPropertyDescriptor(r,t))}))}return e}function p(e,t){if(null==e)return{};var r,n,a=function(e,t){if(null==e)return{};var r,n,a={},l=Object.keys(e);for(n=0;n<l.length;n++)r=l[n],t.indexOf(r)>=0||(a[r]=e[r]);return a}(e,t);if(Object.getOwnPropertySymbols){var l=Object.getOwnPropertySymbols(e);for(n=0;n<l.length;n++)r=l[n],t.indexOf(r)>=0||Object.prototype.propertyIsEnumerable.call(e,r)&&(a[r]=e[r])}return a}var o=n.createContext({}),m=function(e){var t=n.useContext(o),r=t;return e&&(r="function"==typeof e?e(t):i(i({},t),e)),r},s=function(e){var t=m(e.components);return n.createElement(o.Provider,{value:t},e.children)},u={inlineCode:"code",wrapper:function(e){var t=e.children;return n.createElement(n.Fragment,{},t)}},d=n.forwardRef((function(e,t){var r=e.components,a=e.mdxType,l=e.originalType,o=e.parentName,s=p(e,["components","mdxType","originalType","parentName"]),d=m(r),c=a,v=d["".concat(o,".").concat(c)]||d[c]||u[c]||l;return r?n.createElement(v,i(i({ref:t},s),{},{components:r})):n.createElement(v,i({ref:t},s))}));function c(e,t){var r=arguments,a=t&&t.mdxType;if("string"==typeof e||a){var l=r.length,i=new Array(l);i[0]=d;var p={};for(var o in t)hasOwnProperty.call(t,o)&&(p[o]=t[o]);p.originalType=e,p.mdxType="string"==typeof e?e:a,i[1]=p;for(var m=2;m<l;m++)i[m]=r[m];return n.createElement.apply(null,i)}return n.createElement.apply(null,r)}d.displayName="MDXCreateElement"},17076:(e,t,r)=>{r.r(t),r.d(t,{assets:()=>m,contentTitle:()=>p,default:()=>d,frontMatter:()=>i,metadata:()=>o,toc:()=>s});r(67294);var n=r(3905);function a(){return a=Object.assign||function(e){for(var t=1;t<arguments.length;t++){var r=arguments[t];for(var n in r)Object.prototype.hasOwnProperty.call(r,n)&&(e[n]=r[n])}return e},a.apply(this,arguments)}function l(e,t){if(null==e)return{};var r,n,a=function(e,t){if(null==e)return{};var r,n,a={},l=Object.keys(e);for(n=0;n<l.length;n++)r=l[n],t.indexOf(r)>=0||(a[r]=e[r]);return a}(e,t);if(Object.getOwnPropertySymbols){var l=Object.getOwnPropertySymbols(e);for(n=0;n<l.length;n++)r=l[n],t.indexOf(r)>=0||Object.prototype.propertyIsEnumerable.call(e,r)&&(a[r]=e[r])}return a}const i={sidebar_label:"EventEmitter"},p="EventEmitter class",o={unversionedId:"api/puppeteer.eventemitter",id:"version-19.7.4/api/puppeteer.eventemitter",title:"EventEmitter class",description:"The EventEmitter class that many Puppeteer classes extend.",source:"@site/versioned_docs/version-19.7.4/api/puppeteer.eventemitter.md",sourceDirName:"api",slug:"/api/puppeteer.eventemitter",permalink:"/api/puppeteer.eventemitter",draft:!1,tags:[],version:"19.7.4",frontMatter:{sidebar_label:"EventEmitter"},sidebar:"api",previous:{title:"TimeoutError",permalink:"/api/puppeteer.timeouterror"},next:{title:"EventEmitter.addListener",permalink:"/api/puppeteer.eventemitter.addlistener"}},m={},s=[{value:"Signature:",id:"signature",level:4},{value:"Remarks",id:"remarks",level:2},{value:"Methods",id:"methods",level:2}],u={toc:s};function d(e){var{components:t}=e,r=l(e,["components"]);return(0,n.kt)("wrapper",a({},u,r,{components:t,mdxType:"MDXLayout"}),(0,n.kt)("h1",a({},{id:"eventemitter-class"}),"EventEmitter class"),(0,n.kt)("p",null,"The EventEmitter class that many Puppeteer classes extend."),(0,n.kt)("h4",a({},{id:"signature"}),"Signature:"),(0,n.kt)("pre",null,(0,n.kt)("code",a({parentName:"pre"},{className:"language-typescript"}),"export declare class EventEmitter implements CommonEventEmitter\n")),(0,n.kt)("p",null,(0,n.kt)("strong",{parentName:"p"},"Implements:")," ",(0,n.kt)("a",a({parentName:"p"},{href:"/api/puppeteer.commoneventemitter"}),"CommonEventEmitter")),(0,n.kt)("h2",a({},{id:"remarks"}),"Remarks"),(0,n.kt)("p",null,"This allows you to listen to events that Puppeteer classes fire and act accordingly. Therefore you'll mostly use ",(0,n.kt)("a",a({parentName:"p"},{href:"/api/puppeteer.eventemitter.on"}),"on")," and ",(0,n.kt)("a",a({parentName:"p"},{href:"/api/puppeteer.eventemitter.off"}),"off")," to bind and unbind to event listeners."),(0,n.kt)("p",null,"The constructor for this class is marked as internal. Third-party code should not call the constructor directly or create subclasses that extend the ",(0,n.kt)("inlineCode",{parentName:"p"},"EventEmitter")," class."),(0,n.kt)("h2",a({},{id:"methods"}),"Methods"),(0,n.kt)("table",null,(0,n.kt)("thead",{parentName:"table"},(0,n.kt)("tr",{parentName:"thead"},(0,n.kt)("th",a({parentName:"tr"},{align:null}),"Method"),(0,n.kt)("th",a({parentName:"tr"},{align:null}),"Modifiers"),(0,n.kt)("th",a({parentName:"tr"},{align:null}),"Description"))),(0,n.kt)("tbody",{parentName:"table"},(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",a({parentName:"tr"},{align:null}),(0,n.kt)("a",a({parentName:"td"},{href:"/api/puppeteer.eventemitter.addlistener"}),"addListener(event, handler)")),(0,n.kt)("td",a({parentName:"tr"},{align:null})),(0,n.kt)("td",a({parentName:"tr"},{align:null}),"Add an event listener.")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",a({parentName:"tr"},{align:null}),(0,n.kt)("a",a({parentName:"td"},{href:"/api/puppeteer.eventemitter.emit"}),"emit(event, eventData)")),(0,n.kt)("td",a({parentName:"tr"},{align:null})),(0,n.kt)("td",a({parentName:"tr"},{align:null}),"Emit an event and call any associated listeners.")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",a({parentName:"tr"},{align:null}),(0,n.kt)("a",a({parentName:"td"},{href:"/api/puppeteer.eventemitter.listenercount"}),"listenerCount(event)")),(0,n.kt)("td",a({parentName:"tr"},{align:null})),(0,n.kt)("td",a({parentName:"tr"},{align:null}),"Gets the number of listeners for a given event.")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",a({parentName:"tr"},{align:null}),(0,n.kt)("a",a({parentName:"td"},{href:"/api/puppeteer.eventemitter.off"}),"off(event, handler)")),(0,n.kt)("td",a({parentName:"tr"},{align:null})),(0,n.kt)("td",a({parentName:"tr"},{align:null}),"Remove an event listener from firing.")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",a({parentName:"tr"},{align:null}),(0,n.kt)("a",a({parentName:"td"},{href:"/api/puppeteer.eventemitter.on"}),"on(event, handler)")),(0,n.kt)("td",a({parentName:"tr"},{align:null})),(0,n.kt)("td",a({parentName:"tr"},{align:null}),"Bind an event listener to fire when an event occurs.")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",a({parentName:"tr"},{align:null}),(0,n.kt)("a",a({parentName:"td"},{href:"/api/puppeteer.eventemitter.once"}),"once(event, handler)")),(0,n.kt)("td",a({parentName:"tr"},{align:null})),(0,n.kt)("td",a({parentName:"tr"},{align:null}),"Like ",(0,n.kt)("code",null,"on")," but the listener will only be fired once and then it will be removed.")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",a({parentName:"tr"},{align:null}),(0,n.kt)("a",a({parentName:"td"},{href:"/api/puppeteer.eventemitter.removealllisteners"}),"removeAllListeners(event)")),(0,n.kt)("td",a({parentName:"tr"},{align:null})),(0,n.kt)("td",a({parentName:"tr"},{align:null}),"Removes all listeners. If given an event argument, it will remove only listeners for that event.")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",a({parentName:"tr"},{align:null}),(0,n.kt)("a",a({parentName:"td"},{href:"/api/puppeteer.eventemitter.removelistener"}),"removeListener(event, handler)")),(0,n.kt)("td",a({parentName:"tr"},{align:null})),(0,n.kt)("td",a({parentName:"tr"},{align:null}),"Remove an event listener.")))))}d.isMDXComponent=!0}}]);