method EventEmitter.prototype.listenerCountimport { EventEmitter } from "https://deno.land/std@0.177.1/node/events.ts"; listenerCount(eventName: string | symbol): numberReturns the number of listeners listening to the event named eventName. Returns the number of listeners listening to the event named eventName. ParameterseventName: string | symbolThe name of the event being listened for Returnsnumber