import type { Quaternion, Vector3 } from "@babylonjs/core/Maths/math.vector";
import type { DeepImmutable } from "@babylonjs/core/types";
/**
 * Quaternion to axis angle
 * @param q quaternion
 * @param outAxis output axis
 * @param tempQuaternion temporary quaternion
 * @returns angle
 */
export declare function QuaternionToAxisAngle(q: DeepImmutable<Quaternion>, outAxis: Vector3): number;