import { Euler, EulerOrder, EulerTuple } from 'three';
export type EulerLike = {
    x: number;
    y: number;
    z: number;
    order?: EulerOrder;
};
/**
 * Converts degrees to radians
 */
export declare function deg2rad(rotation: Euler | EulerLike): EulerLike;
/**
 * Converts radians to degrees
 */
export declare function rad2deg(rotation: Euler | EulerLike): EulerLike;
/**
 * Converts various rotation formats to a Three.js Euler instance.
 * Memoizes the result to prevent unnecessary re-renders.
 *
 * @param rotation - Rotation in various formats
 * @param from - Unit of the input values: "deg" for degrees, "rad" for radians (default: "rad")
 * @returns Three.js Euler instance or null
 *
 * @example
 * // From object with x, y, z in degrees
 * const rot = useEuler({ x: 90, y: 0, z: 0 }, "deg"); // Returns: Euler(1.57, 0, 0)
 *
 * @example
 * // From array in radians (default)
 * const rot = useEuler([Math.PI/2, 0, 0]); // Returns: Euler(1.57, 0, 0)
 *
 * @example
 * // From array in degrees
 * const rot = useEuler([90, 0, 0], "deg"); // Returns: Euler(1.57, 0, 0)
 *
 * @example
 * // From array with order
 * const rot = useEuler([0, Math.PI, 0, 'XYZ']); // Returns: Euler(0, 3.14, 0, 'XYZ')
 *
 * @example
 * // From undefined/null
 * const rot = useEuler(undefined); // Returns: undefined
 */
export declare const useEuler: (rotation?: EulerLike | EulerTuple | null, from?: "deg" | "rad") => Euler | undefined;
export declare const useEulerTuple: (rotation?: EulerLike | EulerTuple | null, from?: "deg" | "rad") => EulerTuple | undefined;