/**
 * Convert the fraction portion of an RTPS Timestamp
 * ({ int32 seconds; uint32 fraction }) to nanoseconds, where the fraction is
 * defined as `seconds / 2^32`.
 * @param sec Fractional seconds integer
 * @returns Nanoseconds integer
 */
export declare function fractionToNanoseconds(fraction: number): number;
/**
 * Convert nanoseconds to the fraction portion of an RTPS Timestamp
 * ({ int32 seconds; uint32 fraction }) where the fraction is defined as
 * `seconds / 2^32`.
 * @param nsec Nanoseconds integer
 * @returns Fractional seconds integer
 */
export declare function nanosecondsToFraction(nsec: number): number;
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