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function imageSmoother(img: number[][]): number[][] {    const dirs = [        [-1, -1],        [-1, 0],        [-1, 1],        [0, -1],        [0, 1],        [1, -1],        [1, 0],        [1, 1],    ];    return img.map((a, i) =>        a.map((v, j) => {            const all = [                v,                ...dirs                    .map(([r, c]) => img[i + r]?.[j + c])                    .filter(Number.isInteger),            ] as number[];            return Math.floor(all.reduce((a, v) => a + v) / all.length);        })    );}export default imageSmoother;