import Emitter from 'events';

export interface listener<T> {
  (data: T): void;
}

export const off = <T,>(emitter: Emitter, eventName: string, listener: listener<T>) => {
  emitter.off(eventName, listener);
};

export const emit = <T,>(emitter: Emitter, eventName: string, data: T) => {
  return emitter.emit(eventName, data);
};

export const setMaxListeners = (emitter: Emitter, n: number) => {
  emitter.setMaxListeners(n);
};

export const on = <T,>(emitter: Emitter, eventName: string, listener: listener<T>) => {
  emitter.on(eventName, listener);
  return () => {
    emitter.off(eventName, listener);
  };
};