/** Core */
import { Generic } from "cmf.core/src/core";
/**
 * NavigationGuard
 *
 * This service is used to block the navigation with a guard. If the user goes back or forward
 * the navigation is halted until a condition returns true. Useful in wizards, because when the user press back,
 * a confirmation modal is shown on the execution of the guard condition and only if user presses ok the navigation succeed
 * otherwise it will remain in the same url
 */
export declare class NavigationGuard extends Generic {
    /**
     * Guard condition
     */
    private guardCondition;
    /**
     * Is activated
     */
    private active;
    /**
     * Initial href
     */
    private initialHref;
    /**
     * On guard condition evaluate process
     */
    private onGuardConditionEvaluateProcess;
    /**
     * Constructor
     */
    constructor();
    /**
     * Navigation listener
     */
    private navigationListener;
    /**
     * Init guard, setting the current location to be guarded
     * The guard will make the browser to remain in the current url while the guard condition is true
     * @param conditionEvaluateCallback guard condition callback
     * that evaluates if the browser is allowed to exit the current url
     */
    init(conditionEvaluateCallback: (event: any) => Promise<boolean>): void;
    /**
     * Destroy
     */
    destroy(): void;
}