settings eventEmitter.ts

20% Statements 2/10

16.66% Branches 1/6

33.33% Functions 2/6

22.22% Lines 2/9

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  type EventObject<T = unknown> = {
    id: string;
    action: (args: T) => void;
};
 
export class EventEmitter<EventsMap = unknown> {
    private events = {} as Record<keyof EventsMap, EventObject<any>[]>;
 
    on<MapKey extends keyof EventsMap>(type: MapKey, event: EventObject<EventsMap[MapKey]>) {
        if (this.events[type]) {
            this.events[type].push(event);
        } else {
            this.events[type] = [event];
        }
    }
 
    off<MapKey extends keyof EventsMap>(type: MapKey, eventId: string) {
        if (this.events[type]) {
            this.events[type] = this.events[type].filter(({id}) => id !== eventId);
        }
    }
 
    dispatch<MapKey extends keyof EventsMap>(type: MapKey, args: EventsMap[MapKey]) {
        Iif (this.events[type]) {
            this.events[type].forEach(({action}) => {
                action(args);
            });
        }
    }
}