import { Subscription } from "aurelia-event-aggregator";
/**
 * Manages focus on an element.
 * This is needed due to fixes focus bug - https://marcysutton.com/button-focus-hell/
 *
 */
export declare class ElementFocusedController {
    private element;
    private isMouseDown;
    private focusedClass;
    private eventAggregator;
    constructor(prefix: string, element: Element);
    init(): void;
    destroy(): void;
    /**
     * Subscribe on focus callback.
     *
     * @param callback function to invoke when focused.
     * @returns {Subscription} subscription to be able to dispose the listener.
     */
    onFocus(callback: (e: FocusEvent) => void): Subscription;
    /**
     * Subscribe on blur callback.
     *
     * @param callback function to invoke when blur.
     * @returns {Subscription} subscription to be able to dispose the listener.
 */
    onBlur(callback: (e: FocusEvent) => void): Subscription;
    private onMouseDown();
    private onFocused(e);
    private onBlurred(e);
}