import RAPIER from '@dimforge/rapier3d-compat';
export interface PhysicsWorldOptions {
    gravity?: {
        x: number;
        y: number;
        z: number;
    };
    fixedTimestep?: number;
    solverIterations?: number;
}
export declare class PhysicsWorld {
    readonly world: RAPIER.World;
    fixedTimestep: number;
    substeps: number;
    private _accumulator;
    /** Time remaining after the last fixed step (for interpolation/extrapolation). */
    get accumulator(): number;
    constructor(options?: PhysicsWorldOptions);
    setGravity(x: number, y: number, z: number): void;
    setSolverIterations(n: number): void;
    /** Advance the simulation by dt seconds using fixed timestep accumulator. Returns steps taken. */
    step(dt: number): number;
    createRigidBody(desc: RAPIER.RigidBodyDesc): RAPIER.RigidBody;
    createCollider(desc: RAPIER.ColliderDesc, body: RAPIER.RigidBody): RAPIER.Collider;
    removeRigidBody(body: RAPIER.RigidBody): void;
    removeCollider(collider: RAPIER.Collider): void;
    createJoint(data: RAPIER.JointData, body1: RAPIER.RigidBody, body2: RAPIER.RigidBody): RAPIER.ImpulseJoint;
    removeJoint(joint: RAPIER.ImpulseJoint): void;
    /** Reset the fixed-timestep accumulator (e.g. after pause→play). */
    resetAccumulator(): void;
    destroy(): void;
}
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