/**
 * Modifies an event key to reflect propagation by prefixing with the topic.
 */
export type PropagatedEventType<Topic extends string, Type extends string> = `${Topic}-${Type}`;
/**
 * Modifies an event shape to reflect propagation to a parent topic.  The 'type' field
 * is prefixed with the original topic, and a new property is added with the original topic's identity.
 */
export type PropagatedEvent<Topic extends string, Event extends {
    type: string;
}> = Event extends infer E extends {
    type: string;
} ? Omit<E, 'type'> & {
    type: PropagatedEventType<Topic, E['type']>;
} : never;
/**
 * Handler for an event on an EventEmitter; selects the correct type for the event
 * payload from the provided union based on the provided string literal type.
 */
export type EventHandler<EmitterEvent extends BaseEvent, EventType extends string> = (payload: Extract<EmitterEvent, {
    type: EventType;
}>, ...args: any[]) => void;
export type BaseEvent = {
    topic: string;
    type: string;
};
export type IdentityEvent = BaseEvent & {
    uuid: string;
};
export type NamedEvent = IdentityEvent & {
    name: string;
};