Function keepOriginalOrder

lib/util/comparators.js:515–527

(iterable)

 * @returns {Comparator<T>} comparator
 */
const keepOriginalOrder = (iterable) => {
	/** @type {Map<T, number>} */
	const map = new Map();
	let i = 0;
	for (const item of iterable) {
		map.set(item, i++);
	}
	return (a, b) =>
		compareNumbers(
			/** @type {number} */ (map.get(a)),
			/** @type {number} */ (map.get(b))
		);
};

/**
 * Compares chunks natural.