import type { Mat, ReadonlyMat } from "./api.js";
/**
 * Concatenates / multiplies given matrices (min. 2 required) in left-to-right
 * order. A minimum of 2 input matrices must be given. If `out` is null, writes
 * result into `a`.
 *
 * @param out -
 * @param a -
 * @param b -
 * @param rest -
 */
export declare const concat: (out: Mat | null, a: ReadonlyMat, b: ReadonlyMat, ...rest: ReadonlyMat[]) => Mat;
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