implemented frontend including separate message system; started to implement backend

yjs-poll/node_modules/lib0/dist/queue.cjs

@@ -0,0 +1,97 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', { value: true });
+
+class QueueNode {
+  constructor () {
+    /**
+     * @type {QueueNode|null}
+     */
+    this.next = null;
+  }
+}
+
+/**
+ * @template V
+ */
+class QueueValue extends QueueNode {
+  /**
+   * @param {V} v
+   */
+  constructor (v) {
+    super();
+    this.v = v;
+  }
+}
+
+/**
+ * @template {QueueNode} N
+ */
+class Queue {
+  constructor () {
+    /**
+     * @type {N | null}
+     */
+    this.start = null;
+    /**
+     * @type {N | null}
+     */
+    this.end = null;
+  }
+}
+
+/**
+ * @note The queue implementation is experimental and unfinished.
+ * Don't use this in production yet.
+ *
+ * @template {QueueNode} N
+ * @return {Queue<N>}
+ */
+const create = () => new Queue();
+
+/**
+ * @param {Queue<any>} queue
+ */
+const isEmpty = queue => queue.start === null;
+
+/**
+ * @template {Queue<any>} Q
+ * @param {Q} queue
+ * @param {Q extends Queue<infer N> ? N : never} n
+ */
+const enqueue = (queue, n) => {
+  if (queue.end !== null) {
+    queue.end.next = n;
+    queue.end = n;
+  } else {
+    queue.end = n;
+    queue.start = n;
+  }
+};
+
+/**
+ * @template {QueueNode} N
+ * @param {Queue<N>} queue
+ * @return {N | null}
+ */
+const dequeue = queue => {
+  const n = queue.start;
+  if (n !== null) {
+    // @ts-ignore
+    queue.start = n.next;
+    if (queue.start === null) {
+      queue.end = null;
+    }
+    return n
+  }
+  return null
+};
+
+exports.Queue = Queue;
+exports.QueueNode = QueueNode;
+exports.QueueValue = QueueValue;
+exports.create = create;
+exports.dequeue = dequeue;
+exports.enqueue = enqueue;
+exports.isEmpty = isEmpty;
+//# sourceMappingURL=queue.cjs.map