/**
 * event can only use {data} to pass information
 */
export interface UseEventBusEvent {
    type: string;
    data: unknown;
}
export declare type UseEventBusEventHandler = (e: UseEventBusEvent) => void;
/**
 * @returns functions to listen and emit events
 */
export declare function useEventBus(): {
    on: (type: string, handler: UseEventBusEventHandler) => void;
    off: (type: string, handler: UseEventBusEventHandler) => void;
    once: (type: string, handler: UseEventBusEventHandler) => void;
    emit: (type: string, data: unknown) => void;
};