import { PartialNullable } from '../types/interface-types.ts';
export interface IQuaternion {
    /**
     * The x value.
     */
    x: number;
    /**
     * The y value.
     */
    y: number;
    /**
     * The z value.
     */
    z: number;
    /**
     * The w value.
     */
    w: number;
}
/**
 * A Quaternion.
 */
export default class Quaternion implements IQuaternion {
    x: number;
    y: number;
    z: number;
    w: number;
    constructor(options?: PartialNullable<IQuaternion> | null);
    /**
     * Perform a conjugation on this quaternion.
     */
    conjugate(): void;
    /**
     * Return the norm of this quaternion.
     */
    norm(): number;
    /**
     * Perform a normalization on this quaternion.
     */
    normalize(): void;
    /**
     * Convert this quaternion into its inverse.
     */
    invert(): void;
    /**
     * Set the values of this quaternion to the product of itself and the given quaternion.
     *
     * @param q - The quaternion to multiply with.
     */
    multiply(q: IQuaternion): void;
    /**
     * Clone a copy of this quaternion.
     *
     * @returns The cloned quaternion.
     */
    clone(): Quaternion;
}