/**
 * Returns the current timestamp in nanoseconds as a `bigint`.
 *
 * @returns {bigint} The current timestamp in nanoseconds.
 */
export declare const nowInBigIntNanoSeconds: () => bigint;
/**
 * Converts a given `Date` object to a timestamp in nanoseconds as a `bigint`.
 *
 * @param {Date} date - The `Date` object to convert.
 * @returns {bigint} The timestamp in nanoseconds.
 */
export declare const toBigIntNanoSeconds: (date: Date) => bigint;