implemented frontend including separate message system; started to implement backend

yjs-poll/node_modules/lib0/error.js

@@ -0,0 +1,36 @@
+/**
+ * Error helpers.
+ *
+ * @module error
+ */
+
+/**
+ * @param {string} s
+ * @return {Error}
+ */
+/* c8 ignore next */
+export const create = s => new Error(s)
+
+/**
+ * @throws {Error}
+ * @return {never}
+ */
+/* c8 ignore next 3 */
+export const methodUnimplemented = () => {
+  throw create('Method unimplemented')
+}
+
+/**
+ * @throws {Error}
+ * @return {never}
+ */
+/* c8 ignore next 3 */
+export const unexpectedCase = () => {
+  throw create('Unexpected case')
+}
+
+/**
+ * @param {boolean} property
+ * @return {asserts property is true}
+ */
+export const assert = property => { if (!property) throw create('Assert failed') }