slavarazum

type Listener<T extends any[]> = (...args: T) => void;

export default class EventBus<EventMap extends Record<keyof EventMap, any[]>> {
    private listeners: Partial<Record<keyof EventMap, Listener<EventMap[keyof EventMap]>[]>> = {};

    once<K extends keyof EventMap>(event: K, listener: Listener<EventMap[K]>): void {
        const onceListener: Listener<EventMap[K]> = (...args: EventMap[K]) => {
            listener(...args);

            this.off(event, onceListener);

slavarazum

export default function oneOf(values) {
  return function (value) {
    return values.indexOf(value) !== -1;
  };
}