Function mapObject

lib/optimize/SplitChunksPlugin.js:237–248

(obj, fn)

 * @returns {T} result
 */
const mapObject = (obj, fn) => {
	/** @type {T} */
	const newObj = Object.create(null);
	for (const key of Object.keys(obj)) {
		newObj[/** @type {keyof T} */ (key)] = fn(
			obj[/** @type {keyof T} */ (key)],
			/** @type {keyof T} */
			(key)
		);
	}
	return newObj;
};

/**
 * Checks whether this object is overlap.