* starting flow integration

* found a bug in EventHelper
* reduce wait() calls

declarations/Structs.js

@@ -0,0 +1,26 @@
+/* @flow */
+
+type UserId = string
+type Id = [UserId, number]
+
+/*
+type Struct = {
+  id: Id,
+  left?: Id,
+  right?: Id,
+  target?: Id,
+  struct: 'Insert' | 'Delete'
+}*/
+type Struct = Insertion | Deletion
+
+type Insertion = {
+  id: Id,
+  left: Id,
+  right: Id,
+  struct: 'Insert'
+}
+
+type Deletion = {
+  target: Id,
+  struct: 'Delete'
+}

declarations/Y.js

@@ -0,0 +1,17 @@
+/* @flow */
+
+type YGlobal = {
+	utils: Object;
+	Struct: Object;
+	AbstractDatabase: any;
+}
+
+type YInstance = {
+	db: Object,
+	connector: Object,
+	root: Object
+}
+
+declare var YConcurrency_TestingMode : boolean
+
+type Transaction<A> = Generator<any, A, any>