method EventEmitter.prototype._addListenerimport { EventEmitter } from "https://deno.land/x/aleph@v0.2.23/events.ts"; _addListener(eventName: string | symbol,listener: Function | WrappedFunction,prepend: boolean,): thisParameterseventName: string | symbollistener: Function | WrappedFunctionprepend: booleanReturnsthis