/**
 * World Persistence System
 * Provides save/load functionality for complete world state
 */
import { ECSContext } from './ecs';
import { WorldDefinition } from './worldSchema';
/**
 * Save world state to a JSON file
 *
 * @param ctx - ECS context
 * @param filename - Name of the file to save (default: world-save-{timestamp}.json)
 * @returns The serialized world definition
 *
 * @example
 * ```typescript
 * const worldData = saveWorldToFile(engine.ecsWorld, 'my-world.json');
 * ```
 */
export declare function saveWorldToFile(ctx: ECSContext, filename?: string): WorldDefinition;
/**
 * Load world state from a file
 * Opens a file picker and loads the selected world definition
 * Returns the loaded world definition as a string that can be passed to loadWorld()
 *
 * @param onLoad - Callback when world is loaded with the world script string
 * @param onError - Callback when loading fails
 *
 * @example
 * ```typescript
 * loadWorldFromFile(
 *   (worldScript) => engine.loadWorld(worldScript),
 *   (error) => console.error('Failed to load:', error)
 * );
 * ```
 */
export declare function loadWorldFromFile(onLoad: (worldScript: string) => void, onError?: (error: Error) => void): void;
/**
 * Create a save file from world definition (without triggering download)
 * Useful for programmatic access to save data
 *
 * @param ctx - ECS context
 * @returns JSON string of the world definition
 */
export declare function serializeWorldToJSON(ctx: ECSContext): string;
/**
 * Load world from JSON string
 * Returns a world script that can be passed to loadWorld()
 *
 * @param json - JSON string containing world definition
 * @returns World script string
 */
export declare function loadWorldFromJSON(json: string): string;
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