import { MaterialDefinition } from '../modules/material';
import { ECSContext } from './ecs';
import { ArchetypeBundle } from './despawn';
export type InventoryItem = {
    type: 'entity';
    definition: ArchetypeBundle | string;
} | {
    type: 'material';
    definition: MaterialDefinition;
    amount: number;
};
export interface Inventory {
    size: number;
    selected: number;
    slots: (InventoryItem | null)[];
}
export type InventoryChangeCallback = (inv: Inventory) => void;
export declare function createInventory(size: number): Inventory;
export declare function addToInventory(inv: Inventory, item: InventoryItem): boolean;
export declare function inventoryChanged(ctx: ECSContext, eid: number): void;
/**
 * Swap two slots in the inventory and notify listeners.
 * @param ctx ECSContext
 * @param eid Entity id
 * @param inv Inventory object
 * @param indexA First slot index
 * @param indexB Second slot index
 */
export declare function swapInventorySlots(ctx: ECSContext, eid: number, inv: Inventory, indexA: number, indexB: number): void;
export declare function drop(ctx: ECSContext, eid: number, slot: number): number | null;
export declare function dropSelected(ctx: ECSContext, eid: number): number | null;
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