import type { Scene, PhysicsStepper } from '@certe/atmos-core';
import type { PhysicsWorld } from './physics-world.js';
export declare class PhysicsSystem implements PhysicsStepper {
    private readonly _world;
    private _scene;
    /** Cached previous scale per GameObject id to detect changes */
    private readonly _prevScales;
    /** Cached previous position for fixed bodies (avoids WASM FFI when unchanged) */
    private readonly _prevFixedPos;
    /** Cached previous local transform (pos3+rot4+scale3) for child collider GOs */
    private readonly _prevChildTransforms;
    constructor(world: PhysicsWorld, scene: Scene);
    set scene(s: Scene);
    step(dt: number): void;
    private _syncChildColliderOffset;
}
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