/**
 * InventorySystem.ts
 *
 * Item inventory: slots, stacking, weight limits,
 * categories, filters, transfer, and sorting.
 *
 * @module gameplay
 */
export type ItemCategory = 'weapon' | 'armor' | 'consumable' | 'material' | 'quest' | 'misc';
export type ItemRarity = 'common' | 'uncommon' | 'rare' | 'epic' | 'legendary';
export interface ItemDef {
    id: string;
    name: string;
    category: ItemCategory;
    rarity: ItemRarity;
    weight: number;
    maxStack: number;
    value: number;
    properties: Record<string, unknown>;
}
export interface InventorySlot {
    item: ItemDef;
    quantity: number;
    slotIndex: number;
}
export declare class InventorySystem {
    private slots;
    private maxSlots;
    private maxWeight;
    private currentWeight;
    constructor(maxSlots?: number, maxWeight?: number);
    addItem(item: ItemDef, quantity?: number): {
        added: number;
        remaining: number;
    };
    removeItem(itemId: string, quantity?: number): number;
    transfer(target: InventorySystem, itemId: string, quantity?: number): number;
    private findItemDef;
    getSlot(index: number): InventorySlot | undefined;
    getSlotCount(): number;
    getMaxSlots(): number;
    getCurrentWeight(): number;
    getMaxWeight(): number;
    isFull(): boolean;
    getItemCount(itemId: string): number;
    hasItem(itemId: string, quantity?: number): boolean;
    getByCategory(category: ItemCategory): InventorySlot[];
    getAllItems(): InventorySlot[];
    sort(by?: 'name' | 'rarity' | 'category' | 'weight'): void;
    private getNextFreeSlot;
}
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