import { IFormatHandler, SpecParts } from "../Formatter";
/**
 * Complement to `setArtificialNow`, returns
 * the agreed upon current time
 *
 * @return {number} real or artificial current timestamp, in milliseconds
 */
export declare function getNow(): number;
/**
 * Set an artificial value for 'currentTime'.
 * Useful for debugging, or for setting up relative time scenarios
 * against a non-current context.
 * A string or number or Date suitable for a Date constructor
 * can be passed. Pass 0 or undefined to turn off.
 *
 * @param [datevalue] - a value suitable for a Date constructor, or none to turn off
 *
 */
export declare function setArtificialNow(datevalue: any): void;
/**
 * DateRangeFormatter
 *
 * This is the _named handler_ for 'daterange' formatting.
 *
 * Evaluates the date format passed and uses this to group common aspects as implied by the given format
 * and then applies the group-separated formatting to the start and end dates of the range.
 * Uses `Intl` where appropriate and available.
 */
export default class DateRangeFormatter implements IFormatHandler {
    format(specParts: SpecParts, value: any): string;
}