Function combine

lib/util/semver.js:248–261

(items, fn)

	 * @returns {SemVerRange} result
	 */
	const combine = (items, fn) => {
		if (items.length === 1) return items[0];
		const arr = [];
		for (const item of items.slice().reverse()) {
			if (0 in item) {
				arr.push(item);
			} else {
				arr.push(...item.slice(1));
			}
		}

		// eslint-disable-next-line no-sparse-arrays
		return [, ...arr, ...items.slice(1).map(() => fn)];
	};

	/**
	 * Returns the sem ver range.