import { Event } from '../event';
import { NavigationStartPayload } from './navigation-start-payload';
/**
 * Represents a "navigationStart" event.
 *
 * This event is triggered when navigation starts and contains information about the previous and current URLs.
 */
export declare class NavigationStart extends Event<NavigationStartPayload> {
    /**
     * Creates an instance of the NavigationStart event.
     *
     * @param oldUrl - The URL from which the navigation originated.
     * @param newUrl - The URL to which the navigation ended.
     * @param cancelNavigation - A function to cancel the ongoing navigation.
     */
    constructor(oldUrl: string, newUrl: string, cancelNavigation: (cancellationPayload: unknown) => void);
}