Function cachedCleverMerge

lib/util/cleverMerge.js:31–51

(first, second)

 * @returns {T & O | T | O} merged object of first and second object
 */
const cachedCleverMerge = (first, second) => {
	if (second === undefined) return /** @type {T} */ (first);
	if (first === undefined) return /** @type {O} */ (second);
	if (typeof second !== class="st">"object" || second === null) {
		return /** @type {O} */ (second);
	}
	if (typeof first !== class="st">"object" || first === null) {
		return /** @type {T} */ (first);
	}

	let innerCache = mergeCache.get(first);
	if (innerCache === undefined) {
		innerCache = new WeakMap();
		mergeCache.set(first, innerCache);
	}
	const prevMerge = /** @type {T & O} */ (innerCache.get(second));
	if (prevMerge !== undefined) return prevMerge;
	const newMerge = _cleverMerge(first, second, true);
	innerCache.set(second, newMerge);
	return newMerge;
};

/**
 * Caches d set property.