export interface PriceInput {
    price: number | null;
    specialPrice: number | null;
    specialFrom: string | null;
    specialTo: string | null;
}
export interface PriceView extends PriceInput {
    effectivePrice: number | null;
    specialActive: boolean;
}
/**
 * Base vs special price, the way Magento applies it: a special price wins when today is inside its
 * (inclusive, open-ended) date window and it is lower than the base price.
 * Catalog price rules / customer-group prices are NOT included — see ARCHITECTURE.md §3.3.
 */
export declare function effectivePrice(p: PriceInput, today?: string): PriceView;
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