/**
 * Enum which represents all the time units that can be derived from a Period
 *
 * Uppercase time units are absolute
 * Lowercase time units are relative to their parent units (e.g. minutes until last hour)
 *
 * Currently supported units: Seconds, Minutes, Hours and Days.
 *
 * @see {Period#getUnit}
 */
export declare enum TimeKey {
    s = 0,
    S = 1,
    m = 2,
    M = 3,
    h = 4,
    H = 5,
    D = 6,
}
export interface TimeValue {
    /**
     * Value of the instant with the given reference point. (Absolute or Relative, see TimeKey)
     */
    value: number;
    /**
     * Whether the value is still significant, a value becomes non-significant if it passes a point where it
     * will ever be non-zero assuming the period only decreases.
     */
    significant: boolean;
}
/**
 * A period represents an immutable positive length of time in seconds.
 *
 * This class has a number of methods to convert its length to different time scales,
 * see {@see Period#getUnit} for more information.
 */
export declare class Period {
    private seconds;
    /**
     * Create a period for the given length in seconds.
     * If the given length is negative it will be treated as if it was zero.
     *
     * @constructor
     * @param {number} seconds length of this period
     */
    constructor(seconds: number);
    /**
     * A period with a length that is above zero will not be finished, any other lengths will be finished.
     */
    isFinished(): boolean;
    /**
     * Alias for Period.getUnit(TimeKey.S).value
     *
     * Returns the total length of this period in seconds.
     */
    toSeconds(): number;
    /**
     * Method to convert this period into other units of time.
     *
     * See {@see TimeKey} for the supported time units.
     * This method will return {@see TimeValue} describing the value in the given time unit.
     *
     * @param {string|number} key value key to convert to, see {@see TimeKey} for possible values.
     */
    getUnit(key: string | TimeKey): TimeValue;
    /**
     * Determines whether the given period is equal to this period in terms of length.
     *
     * @param period the other period
     */
    eq(period: Period): boolean;
}
/**
 * Factory method to create a period with a length equal to  the given number of milliseconds.
 *
 * Be aware that the period will be limited to a precision in seconds and will be limited to positive values.
 *
 * @param {number} milliSeconds length of the created period in milliseconds
 */
export declare function ofMillis(milliSeconds: number): Period;
/**
 * Factory method to create a period with a length equal to the given number of seconds.
 *
 * Be aware that the period will be limited to positive values.
 *
 * @param {number} seconds length of the created period in seconds
 */
export declare function ofSeconds(seconds: number): Period;