export default function howLongBetween(startDate: Date, endDate: Date): {
    milliseconds: number;
    seconds: number;
    minutes: number;
    hours: number;
    days: number;
    months: number;
    years: number;
};
/**
 * Returns the amount of time between now and the end of JavaScript
 */
export declare function howLongUntilJavaScriptBreaks(): {
    milliseconds: number;
    seconds: number;
    minutes: number;
    hours: number;
    days: number;
    months: number;
    years: number;
};