import type { Fn } from "./fn.js";
import type { IID } from "./id.js";
/**
 * Event listener.
 */
export declare type Listener = Fn<Event, void>;
export interface Event extends IID<PropertyKey> {
    target?: any;
    canceled?: boolean;
    value?: any;
}
/**
 * Interface to provide event emitter functionality. Also see
 * {@link INotifyMixin} decorator mixin.
 */
export interface INotify {
    addListener(id: string, fn: Listener, scope?: any): boolean;
    removeListener(id: string, fn: Listener, scope?: any): boolean;
    /**
     * Broadcasts all registered listeners for given event type (in order
     * registration) and returns true if any of them have been successfully
     * notified.
     *
     * @remarks
     * If a listener canceled the event (by setting {@link Event.canceled}), the
     * function will stop notifying other listeners and return false. If no
     * listeners are registered for the event, the function will also return
     * false.
     *
     * @param event
     */
    notify(event: Event): boolean;
}
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