Function getConnectionsByKey

lib/ModuleGraph.js:47–73

(set, getKey)

 * @returns {ReadonlyMap<T, ReadonlyArray<ModuleGraphConnection>>} mapped by key
 */
const getConnectionsByKey = (set, getKey) => {
	/** @type {Map<T, ModuleGraphConnection[]>} */
	const map = new Map();
	/** @type {T | 0} */
	let lastKey = 0;
	/** @type {ModuleGraphConnection[] | undefined} */
	let lastList;
	for (const connection of set) {
		const key = getKey(connection);
		if (lastKey === key) {
			/** @type {ModuleGraphConnection[]} */
			(lastList).push(connection);
		} else {
			lastKey = key;
			const list = map.get(key);
			if (list !== undefined) {
				lastList = list;
				list.push(connection);
			} else {
				const list = [connection];
				lastList = list;
				map.set(key, list);
			}
		}
	}
	return map;
};

/**
 * Gets connections by origin module.