/**
 * This is the shape of an event listener function
 */
interface EventListener {
    /**
     * A priority is used to specified a launch priority. The lowest is the
     * the priority the soonest it will be launched.
     */
    priority?: number;
    /**
     * This function is attached to a dispatcher or broadcaster to handle
     * a triggered event payload.
     */
    <T>(payload?: T): any | Promise<any>;
    <T, R>(payload?: T): R | Promise<R>;
}
/**
 * A standard LOW priority constant
 */
export declare const LOW_PRIORITY = 255;
/**
 * A standard NORMAL priority constant
 */
export declare const NORMAL_PRIORITY = 0;
/**
 * A standard HIGH priority constant
 */
export declare const HIGH_PRIORITY = -255;
export default EventListener;