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Challenge: a tiny event emitter

Implement this from the stub. Hidden tests grade the behaviour you write, not the comments you leave.

Challenge: A Tiny Event Emitter

export type Listener = (payload: unknown) => void

export class EventEmitter {
  on(event: string, listener: Listener): void {
    // Your implementation here
  }

  off(event: string, listener: Listener): void {
    // Your implementation here
  }

  once(event: string, listener: Listener): void {
    // Your implementation here
  }

  emit(event: string, payload?: unknown): boolean {
    // Your implementation here
  }
}

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