export type EventType = string;
export type EventListener = (event: Event) => Promise<void>;
/**
 * Event is a generic event originating from a tendril app (not the PVM).
 */
export interface Event {
    /**
     * type distinguishes the event.
     */
    type: EventType;
}
export declare class InitEvent {
    type: string;
}
export declare class ConnectedEvent {
    type: string;
}
export declare class StartedEvent {
    type: string;
}
/**
 * EventDispatcher is a simple event dispatcher for tendril applications.
 */
export declare class EventDispatcher {
    listeners: Map<EventType, Set<EventListener>>;
    constructor(listeners?: Map<EventType, Set<EventListener>>);
    /**
     * addListener adds a listener for a specific event type.
     *
     * A listener can only be added once for a specific event type.
     */
    addListener(type: EventType, listener: EventListener): void;
    /**
     * removeListener removes a single listener for a specific event type.
     */
    removeListener(type: EventType, listener: EventListener): void;
    /**
     * removeListeners removes all listeners for a specific event type.
     */
    removeListeners(type: EventType): void;
    /**
     * dispatch an event to all listeners.
     */
    dispatch(event: Event): Promise<void>;
}