export interface GachaItem {
    name: string;
    weight: number;
    rateUp?: boolean;
}
export interface RarityInput {
    rarity: string;
    items: GachaItem[];
}
/** Weighted mode requires explicit rarityRates */
export interface WeightedGachaEngineConfig {
    mode: 'weighted';
    rarityRates: Record<string, number>;
    pools: RarityInput[];
}
/** Flat rate mode does NOT use rarityRates */
export interface FlatRateGachaEngineConfig {
    mode: 'flatRate';
    pools: RarityInput[];
}
export type GachaEngineConfig = WeightedGachaEngineConfig | FlatRateGachaEngineConfig;