import type GameObject from './GameObject.js';
import type Scene from './Scene.js';
import type Camera from './Camera.js';
import type System from './System.js';
import type RenderingSystem from '../systems/RenderingSystem.js';
import type { CollisionManifold } from '../physics/Physics.js';
import type { ObjectSet } from './ObjectSet.js';
/**
 * Internal state of the engine, shared across instances.
 */
export interface EngineState {
    objects: ObjectSet;
    paused: boolean;
    debug: boolean;
    selectedObject: GameObject | null;
    camera: Camera;
    systems: System[];
    renderingSystem?: RenderingSystem;
    events: EventTarget;
    totalPausedTime: number;
    pauseStartTime: number;
    currentScene: Scene | null;
    debugCollisions: {
        manifold: CollisionManifold;
        timestamp: number;
    }[];
    showPhysicsVectors: boolean;
    showCollisionLines: boolean;
    zOrderDirty: boolean;
    sortedObjects: GameObject[];
}
/**
 * Helper to access the global shared state without full Engine dependency.
 */
export declare const getEngineState: () => EngineState;