/** Unit quaternion for rotation without gimbal lock. */
export declare class Quaternion {
    #private;
    constructor(x?: number, y?: number, z?: number, w?: number);
    get x(): number;
    set x(value: number);
    get y(): number;
    set y(value: number);
    get z(): number;
    set z(value: number);
    get w(): number;
    set w(value: number);
    get length(): number;
    get lengthSq(): number;
    clone(): Quaternion;
    copy(q: Quaternion): this;
    divScalar(scalar: number): this;
    fromArray(array: number[]): this;
    /** Computes the conjugate (assumes unit quaternion). */
    invert(): this;
    /** Pre-multiplies this quaternion by q (Hamilton product: q * this). */
    premul(q: Quaternion): this;
    set(x: number, y: number, z: number, w: number): this;
    setFromAxisAngle(axis: {
        x: number;
        y: number;
        z: number;
    }, angle: number): this;
    setFromEuler(euler: {
        x: number;
        y: number;
        z: number;
        order: string;
    }): this;
    setFromRotationMatrix(m: {
        elements: ArrayLike<number>;
    }): this;
    /** Normalizes this quaternion to unit length. */
    normalize(): this;
    [Symbol.iterator](): Generator<number>;
}
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