/**
 * A time-based amount of time, such as '34.5 seconds'.
 *
 * This class models a quantity or amount of time in terms of seconds and nanoseconds. It can be accessed using other
 * duration-based units, such as minutes and hours. In addition, the DAYS unit can be used and is treated as exactly
 * equal to 24 hours, thus ignoring daylight savings effects.
 *
 * A physical duration could be of infinite length. The duration uses nanosecond resolution with a maximum value of the
 * seconds that can be held in a long. This is greater than the current estimated age of the universe.
 *
 * The range of a duration requires the storage of a number larger than a long. To achieve this, the class stores a long
 * representing seconds and an integer representing nanosecond-of-second, which will always be between 0 and 999,999,999.
 * The model is of a directed duration, meaning that the duration may be negative.
 *
 * The duration is measured in "seconds", but these are not necessarily identical to the scientific "SI second"
 * definition based on atomic clocks. This difference only impacts durations measured near a leap-second and should not
 * affect most applications.
 *
 * This is a value-based class; use of identity-sensitive operations on instances of Duration may have unpredictable
 * results and should be avoided. The equals method should be used for comparisons.
 */
export declare class Duration {
    readonly seconds: number;
    readonly nanos: number;
    /**
     * A constant for a duration of zero.
     */
    static readonly ZERO: Duration;
    /**
     * A constant for a duration of forever.
     */
    static readonly FOREVER: Duration;
    /**
     * Creates a new instance of Duration with the specified number of seconds and nanoseconds.
     * This is a private constructor and not intended to be called directly.
     *
     * @param seconds - the number of seconds
     * @param nanos - the number of nanoseconds
     */
    private constructor();
    /**
     * Checks if this duration is zero.
     *
     * @returns true if this duration is zero; false otherwise.
     */
    isZero(): boolean;
    /**
     * Checks if this duration is negative.
     *
     * @returns true if this duration is negative; false otherwise.
     */
    isNegative(): boolean;
    /**
     * Creates a new Duration instance with the specified number of seconds. The current number of nanoseconds in this
     * duration is preserved.
     *
     * @param seconds - the number of seconds for the new duration
     * @returns a new Duration instance with the specified number of seconds.
     */
    withSeconds(seconds: number): Duration;
    /**
     * Creates a new Duration instance with the specified number of nanoseconds. The current number of seconds in this
     * duration is preserved.
     *
     * @param nanos - the number of nanoseconds for the new duration
     * @returns a new Duration instance with the specified number of nanoseconds.
     */
    withNanos(nanos: number): Duration;
    /**
     * Creates a new Duration instance by adding the specified duration to this duration.
     *
     * @param other - the duration to add
     * @returns a new Duration instance with the sum of this duration and the specified duration.
     */
    plus(other: Duration): Duration;
    /**
     * Creates a new Duration instance by adding the specified number of days to this duration.
     *
     * @param daysToAdd - the number of days to add
     * @returns a new Duration instance with the sum of this duration and the specified number of days.
     */
    plusDays(daysToAdd: number): Duration;
    /**
     * Creates a new Duration instance by adding the specified number of hours to this duration.
     *
     * @param hoursToAdd - the number of hours to add
     * @returns a new Duration instance with the sum of this duration and the specified number of hours.
     */
    plusHours(hoursToAdd: number): Duration;
    /**
     * Creates a new Duration instance by adding the specified number of minutes to this duration.
     *
     * @param minutesToAdd - the number of minutes to add
     * @returns a new Duration instance with the sum of this duration and the specified number of minutes.
     */
    plusMinutes(minutesToAdd: number): Duration;
    /**
     * Creates a new Duration instance by adding the specified number of seconds to this duration.
     *
     * @param secondsToAdd - the number of seconds to add
     * @returns a new Duration instance with the sum of this duration and the specified number of seconds.
     */
    plusSeconds(secondsToAdd: number): Duration;
    /**
     * Creates a new Duration instance by adding the specified number of milliseconds to this duration.
     *
     * @param millisToAdd - the number of milliseconds to add
     * @returns a new Duration instance with the sum of this duration and the specified number of milliseconds.
     */
    plusMillis(millisToAdd: number): Duration;
    /**
     * Creates a new Duration instance by adding the specified number of nanoseconds to this duration.
     *
     * @param nanosToAdd - the number of nanoseconds to add
     * @returns a new Duration instance with the sum of this duration and the specified number of nanoseconds.
     */
    plusNanos(nanosToAdd: number): Duration;
    /**
     * Creates a new Duration instance by subtracting the specified duration from this duration.
     *
     * @param other - the duration to subtract
     * @returns a new Duration instance with the difference of this duration and the specified duration.
     */
    minus(other: Duration): Duration;
    /**
     * Creates a new Duration instance by subtracting the specified number of days from this duration.
     *
     * @param daysToSubtract - the number of days to subtract
     * @returns a new Duration instance with the difference of this duration and the specified number of days.
     */
    minusDays(daysToSubtract: number): Duration;
    /**
     * Creates a new Duration instance by subtracting the specified number of hours from this duration.
     *
     * @param hoursToSubtract - the number of hours to subtract
     * @returns a new Duration instance with the difference of this duration and the specified number of hours.
     */
    minusHours(hoursToSubtract: number): Duration;
    /**
     * Creates a new Duration instance by subtracting the specified number of minutes from this duration.
     *
     * @param minutesToSubtract - the number of minutes to subtract
     * @returns a new Duration instance with the difference of this duration and the specified number of minutes.
     */
    minusMinutes(minutesToSubtract: number): Duration;
    /**
     * Creates a new Duration instance by subtracting the specified number of seconds from this duration.
     *
     * @param secondsToSubtract - the number of seconds to subtract
     * @returns a new Duration instance with the difference of this duration and the specified number of seconds.
     */
    minusSeconds(secondsToSubtract: number): Duration;
    /**
     * Creates a new Duration instance by subtracting the specified number of milliseconds from this duration.
     *
     * @param millisToSubtract - the number of milliseconds to subtract
     * @returns a new Duration instance with the difference of this duration and the specified number of milliseconds.
     */
    minusMillis(millisToSubtract: number): Duration;
    /**
     * Creates a new Duration instance by subtracting the specified number of nanoseconds from this duration.
     *
     * @param nanosToSubtract - the number of nanoseconds to subtract
     * @returns a new Duration instance with the difference of this duration and the specified number of nanoseconds.
     */
    minusNanos(nanosToSubtract: number): Duration;
    /**
     * Converts this duration to days.
     *
     * @returns the number of days in this duration.
     */
    toDays(): number;
    /**
     * Converts this duration to hours.
     *
     * @returns the number of hours in this duration.
     */
    toHours(): number;
    /**
     * Converts this duration to minutes.
     *
     * @returns the number of minutes in this duration.
     */
    toMinutes(): number;
    /**
     * Converts this duration to milliseconds.
     *
     * @returns the number of milliseconds in this duration.
     */
    toMillis(): number;
    /**
     * Converts this duration to nanoseconds.
     *
     * @returns the number of nanoseconds in this duration.
     */
    toNanos(): number;
    /**
     * Compares this duration to the specified duration.
     *
     * @param other - the duration being compared to this duration
     * @returns true if the two durations are equal; false otherwise.
     */
    equals(other: Duration): boolean;
    /**
     * Compares this duration to the specified duration.
     *
     * @param other - the duration being compared to this duration
     * @returns a negative value if this duration is less than the specified duration, a positive value if this duration
     * is greater than the specified duration, or zero if the two durations are equal.
     */
    compareTo(other: Duration): number;
    /**
     * Creates a new Duration instance representing the specified number of days.
     *
     * @param days - the number of days
     * @returns a new Duration instance representing the specified number of days.
     */
    static ofDays(days: number): Duration;
    /**
     * Creates a new Duration instance representing the specified number of hours.
     *
     * @param hours - the number of hours
     * @returns a new Duration instance representing the specified number of hours.
     */
    static ofHours(hours: number): Duration;
    /**
     * Creates a new Duration instance representing the specified number of minutes.
     *
     * @param minutes - the number of minutes
     * @returns a new Duration instance representing the specified number of minutes.
     */
    static ofMinutes(minutes: number): Duration;
    /**
     * Creates a new Duration instance representing the specified number of seconds.
     *
     * @param seconds - the number of seconds
     * @returns a new Duration instance representing the specified number of seconds.
     */
    static ofSeconds(seconds: number): Duration;
    /**
     * Creates a new Duration instance representing the specified number of seconds adjusted by a number of nanoseconds.
     *
     * @param seconds - the number of seconds
     * @param nanoAdjustment - the number of nanoseconds by which to adjust the seconds
     * @returns a new Duration instance representing the specified number of seconds adjusted by the specified number of nanoseconds.
     */
    static ofSecondsAdjusted(seconds: number, nanoAdjustment: number): Duration;
    /**
     * Creates a new Duration instance representing the specified number of milliseconds.
     *
     * @param millis - the number of milliseconds
     * @returns a new Duration instance representing the specified number of milliseconds.
     */
    static ofMillis(millis: number): Duration;
    /**
     * Creates a new Duration instance representing the specified number of nanoseconds.
     *
     * @param nanos - the number of nanoseconds
     * @returns a new Duration instance representing the specified number of nanoseconds.
     */
    static ofNanos(nanos: number): Duration;
    /**
     * Private utility method to create a new Duration instance representing the specified number of seconds and
     * nanoseconds.
     *
     * @param seconds - the number of seconds
     * @param nanoAdjustment - the number of nanoseconds
     * @returns a new Duration instance representing the specified number of seconds and nanoseconds.
     */
    private static create;
    /**
     * Private utility method to create a new Duration instance by adding the specified number of seconds and nanoseconds.
     *
     * @param secondsToAdd - the number of seconds to add
     * @param nanosToAdd - the number of nanoseconds to add
     * @returns a new Duration instance with the sum of this duration and the specified number of seconds and nanoseconds.
     */
    private plusExact;
    /**
     * Private utility method to validate the specified number of nanoseconds.
     *
     * @param nanos - the number of nanoseconds to validate
     * @returns true if the specified number of nanoseconds is valid; false otherwise.
     */
    private static isValidNanos;
    /**
     * Private utility method to validate the specified number of nanoseconds.
     *
     * @param nanos - the number of nanoseconds to validate
     * @throws IllegalArgumentError if the specified number of nanoseconds is invalid.
     */
    private static checkValidNanos;
}