basic get&set of Map properties works

src/OperationStores/IndexedDB.js

@@ -113,11 +113,16 @@ Y.IndexedDB = (function(){ //eslint-disable-line no-unused-vars
       if (opts == null) {
         opts = {};
       }
-      if (opts.namespace != null || typeof opts.namespace !== "string") {
+      if (opts.namespace == null || typeof opts.namespace !== "string") {
         throw new Error("IndexedDB: expect a string (opts.namespace)!");
       } else {
         this.namespace = opts.namespace;
       }
+      if (opts.idbVersion != null) {
+        this.idbVersion = opts.idbVersion;
+      } else {
+        this.idbVersion = 5;
+      }
 
       this.transactionQueue = {
         queue: [],
@@ -127,7 +132,7 @@ Y.IndexedDB = (function(){ //eslint-disable-line no-unused-vars
       var store = this;
 
       var tGen = (function *transactionGen(){
-        store.db = yield indexedDB.open(opts.namespace, 3);
+        store.db = yield indexedDB.open(opts.namespace, store.idbVersion);
         var transactionQueue = store.transactionQueue;
 
         var transaction = null;
@@ -174,8 +179,12 @@ Y.IndexedDB = (function(){ //eslint-disable-line no-unused-vars
           };
           request.onupgradeneeded = function(event){
             var db = event.target.result;
-            db.createObjectStore("OperationStore", {keyPath: "id"});
-            db.createObjectStore("StateVector", {keyPath: "user"});
+            try {
+              db.createObjectStore("OperationStore", {keyPath: "id"});
+              db.createObjectStore("StateVector", {keyPath: "user"});
+            } catch (e) {
+                // console.log("Store already exists!");
+            }
           };
         } else {
           tGen.throw("You can not yield this type!");

src/OperationStores/IndexedDB.spec.js

@@ -4,7 +4,7 @@
 if(typeof window !== "undefined"){
   jasmine.DEFAULT_TIMEOUT_INTERVAL = 1000;
   describe("IndexedDB", function() {
-    var ob = new IndexedDB("Test");
+    var ob = new Y.IndexedDB(null, {namespace: "Test"});
 
     it("can add and get operation", function(done) {
       ob.requestTransaction(function*(){

src/OperationStores/Memory.js

@@ -16,7 +16,7 @@ Y.Memory = (function(){ //eslint-disable-line no-unused-vars
 
     constructor (store : OperationStore) {
       super(store);
-      this.sv = store.ss;
+      this.ss = store.ss;
       this.os = store.os;
     }
     *setOperation (op) {
@@ -30,7 +30,7 @@ Y.Memory = (function(){ //eslint-disable-line no-unused-vars
       delete this.os[JSON.stringify(id)];
     }
     *setState (state : State) : State {
-      this.sv[state.user] = state.clock;
+      this.ss[state.user] = state.clock;
     }
     *getState (user : string) : State {
       var clock = this.ss[user];
@@ -80,18 +80,21 @@ Y.Memory = (function(){ //eslint-disable-line no-unused-vars
     }
   }
   class OperationStore extends AbstractOperationStore { //eslint-disable-line no-undef
-    namespace: string;
-    ready: Promise;
-    whenReadyListeners: Array<Function>;
     constructor (y) {
       super(y);
+      this.os = {};
+      this.ss = {};
     }
     requestTransaction (makeGen : Function) {
       var t = new Transaction(this);
       var gen = makeGen.call(t);
-      gen.next();
-      if (gen.done !== true) {
-        throw new Error("transaction is supposed to be done. Note: you may not yield with this transaction! (yield* is allowed though)");
+      var res = gen.next();
+      while(!res.done){
+        if (res.value === "transaction") {
+          res = gen.next(t);
+        } else {
+          throw new Error("You may not yield this type. (Maybe you meant to use 'yield*'?)");
+        }
       }
     }
     *removeDatabase () {