import * as THREE from 'three';
/**
 * A compat function for `Quaternion.invert()` / `Quaternion.inverse()`.
 * `Quaternion.invert()` is introduced in r123 and `Quaternion.inverse()` emits a warning.
 * We are going to use this compat for a while.
 * @param target A target quaternion
 */
export declare function quatInvertCompat<T extends THREE.Quaternion>(target: T): T;