method EventEmitter.listenerCount Usage in Deno```typescript import { type EventEmitter } from "node:node__events.d.ts"; ``` EventEmitter.listenerCount<K>(eventName: Key<K, T>,listener?: Listener2<K, T>,): number Returns the number of listeners listening for the event named `eventName`. If `listener` is provided, it will return how many times the listener is found in the list of the listeners of the event. Type Parameters K Parameters eventName: Key<K, T> The name of the event being listened for optional listener: Listener2<K, T> The event handler function Return Type number