Optional typo fix: prepand -> prepend

src/library/classes/eventEmitter.ts

@@ -13,9 +13,9 @@ export const EventEmitter: EventEmitterConstructor = class Class implements Even
     * @param {string} eventName Event type to listen for
     * @param {Function} listener Function to callback on fire
     * @param {boolean} [once] Whether to listen for the event only ONCE or not
-    * @param {boolean} [prepand] Insert the Event in the beginning of the Array, so it executes first
+    * @param {boolean} [prepend] Insert the Event in the beginning of the Array, so it executes first
     */
-  private _addListener(eventName: string, listener: (...args: any[]) => void, once?: boolean, prepand?: boolean): void {
+  private _addListener(eventName: string, listener: (...args: any[]) => void, once?: boolean, prepend?: boolean): void {
     const listenerCount = this.listenerCount(eventName);
     if(listenerCount >= this._configurations.maxListeners) throw `Warning: Possible EventEmitter memory leak detected. ${listenerCount + 1} ${eventName} listeners added. Use emitter.setMaxListeners(n) to increase limit`;
     const data = {
@@ -24,7 +24,7 @@ export const EventEmitter: EventEmitterConstructor = class Class implements Even
       once,
       executed: false
     };
-    if(prepand) this._listeners.unshift(data);
+    if(prepend) this._listeners.unshift(data);
     else this._listeners.push(data);
   }