import type { KeysByType, Writable } from "../types";
type NavTimingEntry = Writable<PerformanceNavigationTiming> & {
    activationStart: number;
    navigationStart: number;
};
type NavTimingKey = keyof KeysByType<NavTimingEntry, number> | keyof KeysByType<NavTimingEntry, string>;
export type NavigationTimingData = Pick<NavTimingEntry, NavTimingKey>;
export declare function getData(): NavigationTimingData | undefined;
export {};