Function splitToNChunks

test/test262.spectest.js:1145–1157

* @template T * @param {T[]} array an array * @param {number} n number of chunks * @returns {T[][]} splitted to n chunks

(array, n)

 * @returns {T[][]} splitted to n chunks
 */
function splitToNChunks(array, n) {
	/** @type {T[][]} */
	const result = [];

	for (let i = n; i > 0; i--) {
		result.push(
			/** @type {T[]} */
			(array.splice(0, Math.ceil(array.length / i)))
		);
	}

	return result;
}

const shardedTestFiles = splitToNChunks([...testFiles], shard[1])[shard[0] - 1];