import { type Key, type ThrelteUseTask, type ThrelteUseTaskOptions } from '@threlte/core';
/**
 * Adds a handler to the physics simulation. The handler is always executed as
 * part of the simulation stage and before the simulation task.
 *
 * `start` and `stop` functions are returned and the options allow setting the
 * handler to not start automatically.
 *
 * Use the options `after` and `before` to control the order of execution.
 *
 * @param {(delta: number) => void} fn callback function
 * @param {ThrelteUseTaskOptions} options options
 * @returns {ThrelteUseTask}
 */
export declare function usePhysicsTask(fn: (delta: number) => void, options?: ThrelteUseTaskOptions): ThrelteUseTask;
export declare function usePhysicsTask(key: Key, fn: (delta: number) => void, options?: ThrelteUseTaskOptions): ThrelteUseTask;