implemented frontend including separate message system; started to implement backend

yjs-poll/node_modules/lib0/set.js

@@ -0,0 +1,28 @@
+/**
+ * Utility module to work with sets.
+ *
+ * @module set
+ */
+
+export const create = () => new Set()
+
+/**
+ * @template T
+ * @param {Set<T>} set
+ * @return {Array<T>}
+ */
+export const toArray = set => Array.from(set)
+
+/**
+ * @template T
+ * @param {Set<T>} set
+ * @return {T|undefined}
+ */
+export const first = set => set.values().next().value
+
+/**
+ * @template T
+ * @param {Iterable<T>} entries
+ * @return {Set<T>}
+ */
+export const from = entries => new Set(entries)