import type { Campaign } from '@scayle/storefront-api';
/**
 * Checks if a given campaign is currently active.
 *
 * Determines if the current time falls within the campaign's start and end dates.
 *
 * @see https://scayle.dev/en/core-documentation/checkout-guide/features/promotions/discounts-and-offers/price-campaigns
 *
 * @param campaign The campaign to check.
 *
 * @returns True if the campaign is active, false otherwise.
 */
export declare const isCampaignActive: (campaign?: Campaign) => boolean;
/**
 * Checks if a given campaign has not yet ended.
 *
 * Compares the campaign's end date with the current time.
 *
 * @see https://scayle.dev/en/core-documentation/checkout-guide/features/promotions/discounts-and-offers/price-campaigns
 *
 * @param campaign The campaign to check.
 *
 * @returns True if the campaign has not ended, false otherwise.
 */
export declare const campaignHasNotEnded: (campaign: Campaign) => boolean;
/**
 * Sorts campaigns by their start date in ascending order.
 *
 * Uses the difference between start times to determine order.
 *
 * @see https://scayle.dev/en/core-documentation/checkout-guide/features/promotions/discounts-and-offers/price-campaigns
 *
 * @param a The first campaign to compare.
 * @param b The second campaign to compare.
 *
 * @returns A negative number if `a` starts before `b`, a positive number if `a` starts after `b`, and 0 if they start at the same time.
 */
export declare const sortCampaignsByDateAscending: (a: Campaign, b: Campaign) => number;