import type { matrix } from "../types";
/**
 * Asserts that a value is a 2D matrix.
 *
 * Throws a TypeError if the input is not a 2D matrix. Uses TypeScript's type assertion to narrow the type.
 *
 * @param x The value to check
 * @throws If x is not a 2D matrix
 *
 * @example Valid matrix
 * ```ts
 * import { assertThrows } from "jsr:@std/assert";
 *
 * assertmatrix([[1, 2], [3, 4]]); // No error
 *
 * ```
 *
 * @example Invalid input throws error
 * ```ts
 * import { assertThrows } from "jsr:@std/assert";
 *
 * assertThrows(() => assertmatrix([1, 2, 3]), TypeError, "Expected matrix");
 *
 * ```
 *
 * @example Number throws error
 * ```ts
 * import { assertThrows } from "jsr:@std/assert";
 *
 * assertThrows(() => assertmatrix(5), TypeError, "Expected matrix");
 * ```
 */
export default function assertmatrix(x: unknown): asserts x is matrix;
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