export interface ICalDurationDict {
    weeks?: number;
    days?: number;
    hours?: number;
    minutes?: number;
    seconds?: number;
    isNegative?: boolean;
}
/**
 * This class represents the "duration" value type, with various calculation
 * and manipulation methods.
 */
export declare class ICalDuration {
    weeks: number;
    days: number;
    hours: number;
    minutes: number;
    seconds: number;
    isNegative: boolean;
    icalclass: string;
    icaltype: string;
    constructor(data?: ICalDurationDict);
    /**
     * Sets up the current instance using members from the passed data object.Sets up the current instance using members from the passed data object.
     * @param data
     */
    fromData(data?: ICalDurationDict): void;
    /**
     * The duration value expressed as a number of seconds.
     */
    toSeconds(): number;
    /** The string representation of this duration. */
    toString(): string;
}
export declare const fromString: (str: string) => ICalDuration;
/**
 * Checks if the given string is an iCalendar duration value.
 */
export declare const isValueString: (str: string) => boolean;