Function parseObject

lib/util/cleverMerge.js:150–230

(obj)

 * @returns {ParsedObject<T>} parsed object
 */
const parseObject = (obj) => {
	/** @type {ParsedObjectStatic<T>} */
	const info = new Map();
	/** @type {ParsedObjectDynamic<T> | undefined} */
	let dynamicInfo;
	/**
	 * Returns object parsed property entry.
	 * @param {keyof T} p path
	 * @returns {Partial<ObjectParsedPropertyEntry<T>>} object parsed property entry
	 */
	const getInfo = (p) => {
		const entry = info.get(p);
		if (entry !== undefined) return entry;
		const newEntry = {
			base: undefined,
			byProperty: undefined,
			byValues: undefined
		};
		info.set(p, newEntry);
		return newEntry;
	};
	for (const key_ of Object.keys(obj)) {
		const key = /** @type {keyof T} */ (key_);
		if (typeof key === "string" && key.startsWith("by")) {
			const byProperty = key;
			const byObj = /** @type {ByObject} */ (obj[byProperty]);
			if (typeof byObj === "object") {
				for (const byValue of Object.keys(byObj)) {
					const obj = byObj[/** @type {keyof (keyof T)} */ (byValue)];
					for (const key of Object.keys(obj)) {
						const entry = getInfo(/** @type {keyof T} */ (key));
						if (entry.byProperty === undefined) {
							entry.byProperty = /** @type {`by${string}`} */ (byProperty);
							entry.byValues = new Map();
						} else if (entry.byProperty !== byProperty) {
							throw new Error(
								`${/** @type {string} */ (byProperty)} and ${entry.byProperty} for a single property is not supported`
							);
						}
						/** @type {ByValues} */
						(entry.byValues).set(byValue, obj[key]);
						if (byValue === "default") {
							for (const otherByValue of Object.keys(byObj)) {
								if (
									!(
										/** @type {ByValues} */
										(entry.byValues).has(otherByValue)
									)
								) {
									/** @type {ByValues} */
									(entry.byValues).set(otherByValue, undefined);
								}
							}
						}
					}
				}
			} else if (typeof byObj === "function") {
				if (dynamicInfo === undefined) {