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Module

std/node/events.ts>listenerCount

Deno standard library
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function listenerCount
Deprecated
Deprecated

Since v3.2.0 - Use listenerCount instead.

import { listenerCount } from "https://deno.land/std@0.158.0/node/events.ts";

A class method that returns the number of listeners for the given eventNameregistered on the given emitter.

const { EventEmitter, listenerCount } = require('events');
const myEmitter = new EventEmitter();
myEmitter.on('event', () => {});
myEmitter.on('event', () => {});
console.log(listenerCount(myEmitter, 'event'));
// Prints: 2

Parameters

emitter: EventEmitter

The emitter to query

eventName: string | symbol

The event name

Returns

number