typed-event-target/dist/events/event-types.d.ts

EventTarget in the browser but with strong event typing.

/**
 * Extract all event type string types from a union of events.
 *
 * @category Internal
 */
export type ExtractEventTypes<EventsUnion extends Readonly<Event>> = EventsUnion['type'];
/**
 * Extract an event type from a union based on the event type string.
 *
 * @category Internal
 */
export type ExtractEventByType<EventsUnion extends Readonly<Event>, EventType extends ExtractEventTypes<EventsUnion>> = EventsUnion extends {
    type: EventType;
} ? EventsUnion : never;