/**
 * Rule command payload definition.
 */
type Rule = {
    /**
     * The function to execute.
     */
    func: string;
};
/**
 * Start screen measurement in Longshot.
 *
 * @param payload Rule command payload.
 * @returns Longshot rule URL.
 * @example
 * rule({ func: 'start' })
 * // => 'longshot://rule?func=start'
 * @link https://longshot.chitaner.com/blog/urlschemeapi/
 */
export declare function rule(payload: Rule): string;
export {};