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node_modules/stylelint/lib/utils/createMapWithSet.mjs

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+/**
+ * Create a map with unique sets of values from a record.
+ *
+ * @template T
+ * @param {Record<string, T | T[]>} record
+ * @returns {Map<string, Set<T>>}
+ */
+export default function createMapWithSet(record) {
+	/** @type {Map<string, Set<T>>} */
+	const map = new Map();
+
+	for (const [key, value] of Object.entries(record)) {
+		const list = Array.isArray(value) ? value : [value];
+
+		map.set(key, new Set(list));
+	}
+
+	return map;
+}