Function merge

lib/util/LazySet.js:17–23

(targetSet, toMerge)

 * @returns {void}
 */
const merge = (targetSet, toMerge) => {
	for (const set of toMerge) {
		for (const item of set) {
			targetSet.add(item);
		}
	}
};

/**
 * Flattens nested `LazySet` instances into a single collection of iterables