/**
 * Checks whether the current browser supports
 * navigation preloading.
 *
 * @returns
 * @see https://serwist.pages.dev/docs/serwist/core/is-navigation-preload-supported
 */
export declare const isNavigationPreloadSupported: () => boolean;
/**
 * If the browser supports navigation preloading, then this will enable it.
 *
 * @param headerValue Optional. Allows developers to override the value of
 * the `Service-Worker-Navigation-Preload` header which will be sent to the
 * server when making the navigation request.
 * @see https://serwist.pages.dev/docs/serwist/core/enable-navigation-preload
 */
export declare const enableNavigationPreload: (headerValue?: string) => void;
/**
 * If the browser supports navigation preloading, then this will disable it.
 *
 * @see https://serwist.pages.dev/docs/serwist/core/disable-navigation-preload
 */
export declare const disableNavigationPreload: () => void;
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