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import { EventEmitter } from '../../deps.ts'
export class HarmonyEventEmitter<  T extends Record<string, unknown[]>> extends EventEmitter<T> {  constructor() {    super(0)  }
  /** Wait for an Event to fire with given condition. */  async waitFor<K extends keyof T>(    event: K,    checkFunction: (...args: T[K]) => boolean = () => true,    timeout?: number  ): Promise<T[K] | []> {    return await new Promise((resolve) => {      let timeoutID: number | undefined      if (timeout !== undefined) {        timeoutID = setTimeout(() => {          this.off(event, eventFunc)          resolve([])        }, timeout)      }      const eventFunc = (...args: T[K]): void => {        if (checkFunction(...args)) {          resolve(args)          this.off(event, eventFunc)          if (timeoutID !== undefined) clearTimeout(timeoutID)        }      }      this.on(event, eventFunc)    })  }}