import type { PromoStackingMode } from '../checkout/sessionMetadataV5.js';
export type PromoLoyaltyApplicationOrder = 'NONE' | 'PROMO_ONLY' | 'LOYALTY_ONLY' | 'PROMO_THEN_LOYALTY';
export interface ResolvePromoLoyaltyStackInput {
    readonly stackingMode: PromoStackingMode;
    readonly activatedPromoRewardId?: string | null;
    readonly activatedCouponId?: string | null;
    /** Major-currency promo discount from preview (optional; used for totals). */
    readonly promoDiscountAmount?: number;
    /** Major-currency loyalty discount from preview (optional; used for totals). */
    readonly loyaltyDiscountAmount?: number;
}
export interface ResolvePromoLoyaltyStackResult {
    /** False when EXCLUSIVE and both instruments are present (apply must 409). */
    readonly allowed: boolean;
    readonly mutualExclusion: boolean;
    readonly mutualExclusionCode: 'PROMO_LOYALTY_MUTUAL_EXCLUSION' | null;
    /** HTTP hint for apply/remove conflict surfaces. */
    readonly httpStatus: 409 | null;
    readonly applicationOrder: PromoLoyaltyApplicationOrder;
    readonly effectiveActivatedPromoRewardId: string | null;
    readonly effectiveActivatedCouponId: string | null;
    /**
     * Preview total: STACK sums both; EXCLUSIVE uses max when conflict unresolved,
     * otherwise the single active instrument amount.
     */
    readonly totalDiscountAmount: number;
}
/**
 * Resolve promo ↔ loyalty stacking for apply / preview / remove UX (plan §3.16).
 *
 * - EXCLUSIVE + both present → mutual exclusion (`PROMO_LOYALTY_MUTUAL_EXCLUSION` / 409).
 * - STACK_PROMO_THEN_LOYALTY → promo first, then loyalty on residual (both effective).
 * - Remove code clears promo only; loyalty remains when still eligible (callers pass
 *   `activatedPromoRewardId: null` after remove).
 */
export declare function resolvePromoLoyaltyStack(input: ResolvePromoLoyaltyStackInput): ResolvePromoLoyaltyStackResult;
//# sourceMappingURL=resolvePromoLoyaltyStack.d.ts.map