import RAPIER from '@dimforge/rapier3d-compat';
import { Joint } from './joint.js';
import type { JointOptions } from './joint.js';
import type { PhysicsWorld } from './physics-world.js';
export interface SpringJointOptions extends JointOptions {
    restLength?: number;
    stiffness?: number;
    damping?: number;
}
export declare class SpringJoint extends Joint {
    private _restLength;
    private _stiffness;
    private _damping;
    get restLength(): number;
    set restLength(v: number);
    get stiffness(): number;
    set stiffness(v: number);
    get damping(): number;
    set damping(v: number);
    init(world: PhysicsWorld, options?: SpringJointOptions): void;
    protected _createJointData(): RAPIER.JointData;
}
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