import type { VecOpVV } from "@thi.ng/vectors";
/**
 * Performs quaternion multiplication of `a` and `b` and writes result
 * to `out`. If `out` is null, writes result into `a`.
 *
 * @param out -
 * @param a -
 * @param b -
 */
export declare const mulQ: VecOpVV;
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