diff --git a/.eslintrc b/.eslintrc
index 38807764..35eecedd 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -33,6 +33,7 @@
     "compareAllUsers": true,
     "createUsers": true,
     "getRandomNumber": true,
-    "applyRandomTransactions": true
+    "applyRandomTransactions": true,
+    "CustomType": true
   }
 }
diff --git a/src/OperationStore.js b/src/OperationStore.js
index 501759b3..60daa893 100644
--- a/src/OperationStore.js
+++ b/src/OperationStore.js
@@ -9,7 +9,7 @@ class AbstractTransaction { //eslint-disable-line no-unused-vars
     if (t == null) {
       var op = yield* this.getOperation(id);
       if (op != null) {
-        t = yield* Y[op.type].create.call(this, this.store, op);
+        t = yield* Y[op.type].initType.call(this, this.store, op);
         this.store.initializedTypes[sid] = t;
       }
     }
@@ -17,7 +17,7 @@ class AbstractTransaction { //eslint-disable-line no-unused-vars
   }
   *createType (model) {
     var sid = JSON.stringify(model.id);
-    var t = yield* Y[model.type].create(this.store, model);
+    var t = yield* Y[model.type].initType.call(this, this.store, model);
     this.store.initializedTypes[sid] = t;
     return t;
   }
diff --git a/src/Types/Array.js b/src/Types/Array.js
index 4e35dcce..e4ab55b7 100644
--- a/src/Types/Array.js
+++ b/src/Types/Array.js
@@ -155,23 +155,26 @@
     }
   }
 
-  Y.Array = function* _YArray(){
-    var model = {
-      start: null,
-      end: null,
-      struct: "List",
-      type: "Array",
-      id: this.store.getNextOpId()
-    };
-    yield* this.applyCreatedOperations([model]);
-    return yield* this.createType(model);
-  };
-  Y.Array.create = function* YArrayCreate(os, model){
-    var valArray = [];
-    var idArray = yield* Y.Struct.List.map.call(this, model, function(c){
-      valArray.push(c.content);
-      return JSON.stringify(c.id);
-    });
-    return new YArray(os, model.id, idArray, valArray);
-  };
+  Y.Array = new CustomType({
+    class: YArray,
+    createType: function* YArrayCreator () {
+      var model = {
+        start: null,
+        end: null,
+        struct: "List",
+        type: "Array",
+        id: this.store.getNextOpId()
+      };
+      yield* this.applyCreatedOperations([model]);
+      return yield* this.createType(model);
+    },
+    initType: function* YArrayInitializer(os, model){
+      var valArray = [];
+      var idArray = yield* Y.Struct.List.map.call(this, model, function(c){
+        valArray.push(c.content);
+        return JSON.stringify(c.id);
+      });
+      return new YArray(os, model.id, idArray, valArray);
+    }
+  });
 })();
diff --git a/src/Types/Map.js b/src/Types/Map.js
index fc3b553f..b1337c5e 100644
--- a/src/Types/Map.js
+++ b/src/Types/Map.js
@@ -1,92 +1,5 @@
-
-var GeneratorFunction = (function*(){}).constructor;
-
-class EventHandler {
-  constructor (onevent) {
-    this.waiting = [];
-    this.awaiting = 0;
-    this.onevent = onevent;
-    this.userEventListeners = [];
-  }
-  receivedOp (op) {
-    if (this.awaiting <= 0) {
-      this.onevent([op]);
-    } else {
-      this.waiting.push(copyObject(op));
-    }
-  }
-  awaitAndPrematurelyCall (ops) {
-    this.awaiting++;
-    this.onevent(ops);
-  }
-  addUserEventListener (f) {
-    this.userEventListeners.push(f);
-  }
-  removeUserEventListener (f) {
-    this.userEventListeners = this.userEventListeners.filter(function(g){
-      return f !== g;
-    });
-  }
-  removeAllUserEventListeners () {
-    this.userEventListeners = [];
-  }
-  callUserEventListeners (event) {
-    for (var i in this.userEventListeners) {
-      try {
-        this.userEventListeners[i](event);
-      } catch (e) {
-        console.log("User events must not throw Errors!");//eslint-disable-line
-      }
-    }
-  }
-  awaitedLastInserts (n) {
-    var ops = this.waiting.splice(this.waiting.length - n);
-    for (var oid = 0; oid < ops.length; oid++) {
-      var op = ops[oid];
-      for (var i = this.waiting.length - 1; i >= 0; i--) {
-        let w = this.waiting[i];
-        if (compareIds(op.left, w.id)) {
-          // include the effect of op in w
-          w.right = op.id;
-          // exclude the effect of w in op
-          op.left = w.left;
-        } else if (compareIds(op.right, w.id)) {
-          // similar..
-          w.left = op.id;
-          op.right = w.right;
-        }
-      }
-    }
-    this.tryCallEvents();
-  }
-  awaitedLastDeletes (n, newLeft) {
-    var ops = this.waiting.splice(this.waiting.length - n);
-    for (var j in ops) {
-      var del = ops[j];
-      if (newLeft != null) {
-        for (var i in this.waiting) {
-          let w = this.waiting[i];
-          // We will just care about w.left
-          if (compareIds(del.target, w.left)) {
-            del.left = newLeft;
-          }
-        }
-      }
-    }
-    this.tryCallEvents();
-  }
-  tryCallEvents () {
-    this.awaiting--;
-    if (this.awaiting <= 0 && this.waiting.length > 0) {
-      var events = this.waiting;
-      this.waiting = [];
-      this.onevent(events);
-    }
-  }
-
-}
 (function(){
-  class Map {
+  class YMap {
     constructor (os, model) {
       this._model = model.id;
       this.os = os;
@@ -210,10 +123,10 @@ class EventHandler {
         struct: "Insert"
       };
       var def = Promise.defer();
-      if ( value != null && value.constructor === GeneratorFunction) {
+      if ( value instanceof CustomType) {
         // construct a new type
         this.os.requestTransaction(function*(){
-          var type = yield* value.call(this);
+          var type = yield* value.createType.call(this);
           insert.opContent = type._model;
           insert.id = this.store.getNextOpId();
           yield* this.applyCreatedOperations([insert]);
@@ -243,18 +156,20 @@ class EventHandler {
       this.eventHandler.receivedOp(op);
     }
   }
-
-  Y.Map = function* YMap(){
-    var model = {
-      map: {},
-      struct: "Map",
-      type: "Map",
-      id: this.store.getNextOpId()
-    };
-    yield* this.applyCreatedOperations([model]);
-    return yield* this.createType(model);
-  };
-  Y.Map.create = function* YMapCreate(os, model){
-    return new Map(os, model);
-  };
+  Y.Map = new CustomType({
+    class: YMap,
+    createType: function* YMapCreator(){
+      var model = {
+        map: {},
+        struct: "Map",
+        type: "Map",
+        id: this.store.getNextOpId()
+      };
+      yield* this.applyCreatedOperations([model]);
+      return yield* this.createType(model);
+    },
+    initType: function* YMapInitializer(os, model){
+      return new YMap(os, model);
+    }
+  });
 })();
diff --git a/src/Types/TextBind.js b/src/Types/TextBind.js
new file mode 100644
index 00000000..e69de29b
diff --git a/src/Utils.js b/src/Utils.js
new file mode 100644
index 00000000..c24c59fc
--- /dev/null
+++ b/src/Utils.js
@@ -0,0 +1,100 @@
+
+var GeneratorFunction = (function*(){}).constructor;//eslint-disable-line
+
+class EventHandler { //eslint-disable-line
+  constructor (onevent) {
+    this.waiting = [];
+    this.awaiting = 0;
+    this.onevent = onevent;
+    this.userEventListeners = [];
+  }
+  receivedOp (op) {
+    if (this.awaiting <= 0) {
+      this.onevent([op]);
+    } else {
+      this.waiting.push(copyObject(op));
+    }
+  }
+  awaitAndPrematurelyCall (ops) {
+    this.awaiting++;
+    this.onevent(ops);
+  }
+  addUserEventListener (f) {
+    this.userEventListeners.push(f);
+  }
+  removeUserEventListener (f) {
+    this.userEventListeners = this.userEventListeners.filter(function(g){
+      return f !== g;
+    });
+  }
+  removeAllUserEventListeners () {
+    this.userEventListeners = [];
+  }
+  callUserEventListeners (event) {
+    for (var i in this.userEventListeners) {
+      try {
+        this.userEventListeners[i](event);
+      } catch (e) {
+        console.log("User events must not throw Errors!");//eslint-disable-line
+      }
+    }
+  }
+  awaitedLastInserts (n) {
+    var ops = this.waiting.splice(this.waiting.length - n);
+    for (var oid = 0; oid < ops.length; oid++) {
+      var op = ops[oid];
+      for (var i = this.waiting.length - 1; i >= 0; i--) {
+        let w = this.waiting[i];
+        if (compareIds(op.left, w.id)) {
+          // include the effect of op in w
+          w.right = op.id;
+          // exclude the effect of w in op
+          op.left = w.left;
+        } else if (compareIds(op.right, w.id)) {
+          // similar..
+          w.left = op.id;
+          op.right = w.right;
+        }
+      }
+    }
+    this.tryCallEvents();
+  }
+  awaitedLastDeletes (n, newLeft) {
+    var ops = this.waiting.splice(this.waiting.length - n);
+    for (var j in ops) {
+      var del = ops[j];
+      if (newLeft != null) {
+        for (var i in this.waiting) {
+          let w = this.waiting[i];
+          // We will just care about w.left
+          if (compareIds(del.target, w.left)) {
+            del.left = newLeft;
+          }
+        }
+      }
+    }
+    this.tryCallEvents();
+  }
+  tryCallEvents () {
+    this.awaiting--;
+    if (this.awaiting <= 0 && this.waiting.length > 0) {
+      var events = this.waiting;
+      this.waiting = [];
+      this.onevent(events);
+    }
+  }
+}
+
+class CustomType { //eslint-disable-line
+  constructor (def) {
+    if (def.createType == null
+      || def.initType == null
+      || def.class == null
+    ) {
+      throw new Error("Custom type was not initialized correctly!");
+    }
+    this.createType = def.createType;
+    this.initType = def.initType;
+    this.class = def.class;
+  }
+}