method EventEmitter.prototype.listenerCountimport { EventEmitter } from "https://dotland.deno.dev/x/opine@2.3.4/deps.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