export type Discount = {
    code: string;
    percentOff: number | null;
    /** Fixed amount off in minor units (cents). */
    amountOff: number | null;
    active: boolean;
    maxUses: number | null;
    usedCount: number;
    /** Expiry as epoch ms, or null for no expiry. */
    expiresAt: number | null;
};
/** Whether a code can be redeemed right now. */
export declare const isDiscountValid: (discount: Discount | null | undefined, now?: number) => boolean;
/** The amount a code takes off a subtotal, in minor units (cents). */
export declare const discountAmountCents: (discount: Discount, subtotalCents: number) => number;