// Types for engine.js (used by the admin editor's example-cart preview).
export interface EngineScope { variantIds?: Set<string>; productIds?: Set<string>; collectionIds?: Set<string> }
export interface EngineOffer {
  id: string;
  type: "fixed" | "mix" | "bxgy" | string;
  maxUses?: number;
  discountType?: string;
  value?: number;
  lines?: { variantId?: string; productId?: string; quantity: number }[];
  qty?: number;
  scope?: EngineScope;
  buyQty?: number;
  getQty?: number;
  getPercent?: number;
  buyScope?: EngineScope;
  getScope?: EngineScope;
}
export interface EngineUnit { lineId: string; variantId: string; productId: string; collectionIds: string[]; price: number }
export interface EngineApplication { offerId: string; discount: number; units: EngineUnit[]; getUnits: EngineUnit[] | null }
export function bundleDiscount(regular: number, discountType: string, value: number): number;
export function applyOffers(units: EngineUnit[], offers: EngineOffer[]): EngineApplication[];
export function allocateByLine(apps: EngineApplication[], options?: { bxgyGetUnitsOnly?: boolean }): Map<string, number>;
export function largestRemainderCents(amounts: number[]): number[];
export function toUnits(lines: { id: string; variantId: string; productId: string; collectionIds?: string[]; unitPrice: number; quantity: number }[]): EngineUnit[];