diff --git a/package.json b/package.json
index d532a3c..593a9c6 100644
--- a/package.json
+++ b/package.json
@@ -15,6 +15,7 @@
     "test": "yarn run jest",
     "test:watch": "yarn run jest -- --watch",
     "jest": "PWD=$(pwd) NODE_ENV=test ./node_modules/.bin/jest -w 1 --coverage",
+    "build:dev": "set NODE_ENV=production && ./node_modules/.bin/webpack-dashboard -m -- ./node_modules/.bin/webpack --progress --profile --colors --config ./config/webpack/webpack.config.dev.js",
     "build": "set NODE_ENV=production && ./node_modules/.bin/webpack-dashboard -m -- ./node_modules/.bin/webpack --progress --profile --colors --config ./config/webpack/webpack.config.prod.js",
     "lint": "./node_modules/.bin/tslint -c tslint.json 'src/ts/**/*.{ts,tsx}' && ./node_modules/.bin/sass-lint 'src/**/*.scss'",
     "stats": "set NODE_ENV=production && webpack --progress --config ./config/webpack/webpack.config.stats.js --profile --json > ./config/webpack/stats/stats.json"
diff --git a/src/ts/@overflow/commons/core/reflect/class.ts b/src/ts/@overflow/commons/core/reflect/class.ts
index 1ab6c39..cccc2e4 100644
--- a/src/ts/@overflow/commons/core/reflect/class.ts
+++ b/src/ts/@overflow/commons/core/reflect/class.ts
@@ -11,6 +11,7 @@ import {Method} from './method';
 
 export class Class extends AccessibleObject {
   private _clazzType: ClassType;
+  private _constructor: Constructor;
   private _fields: Map<PropertyKeyType, Field>;
   private _methods: Map<PropertyKeyType, Method>;
 
@@ -31,6 +32,13 @@ export class Class extends AccessibleObject {
       Metadata.set(LOAFER_CLASS, clazz, clazzType);
     }
 
+    if (null === clazz._constructor) {
+      let parameterTypes = Metadata.getOwnParamTypes(clazzType);
+      if (undefined !== parameterTypes) {
+        clazz._constructor = new Constructor(clazz, parameterTypes);
+      }
+    }
+
     return clazz;
   }
 
@@ -39,6 +47,19 @@ export class Class extends AccessibleObject {
     this._clazzType = clazzType;
     this._fields = new Map();
     this._methods = new Map();
+    this._constructor = null;
+  }
+
+  /**
+   * _defineField
+   */
+  public _defineConstructor(parameterTypes: any[]): Constructor {
+    let cons: Constructor = this._constructor;
+    if (undefined === cons) {
+      cons = new Constructor(this, parameterTypes);
+      this._constructor = cons;
+    }
+    return cons;
   }
 
   /**
@@ -65,6 +86,9 @@ export class Class extends AccessibleObject {
     return method;
   }
 
+  public getConstructor(): Constructor {
+    return this._constructor;
+  }
 
   public getOwnField(propertyKey: PropertyKeyType): Field {
     return this._fields.get(propertyKey);
diff --git a/src/ts/@overflow/commons/core/type/metadata.ts b/src/ts/@overflow/commons/core/type/metadata.ts
index ba5540b..0fc4446 100644
--- a/src/ts/@overflow/commons/core/type/metadata.ts
+++ b/src/ts/@overflow/commons/core/type/metadata.ts
@@ -458,7 +458,7 @@ export class Metadata {
    *
    */
   public static getParamTypes(target: any, propertyKey?: PropertyKeyType): any[] {
-      return Reflect.getMetadata(DESIGN_PARAM_TYPES, target, propertyKey!) || [];
+      return Reflect.getMetadata(DESIGN_PARAM_TYPES, target, propertyKey!);
   }
 
   /**
@@ -490,7 +490,7 @@ export class Metadata {
    *
    */
   public static getOwnParamTypes(target: any, propertyKey?: PropertyKeyType): any[] {
-      return Reflect.getOwnMetadata(DESIGN_PARAM_TYPES, target, propertyKey!) || [];
+      return Reflect.getOwnMetadata(DESIGN_PARAM_TYPES, target, propertyKey!);
   }
 }
 
diff --git a/src/ts/@overflow/commons/decorator/decorator.ts b/src/ts/@overflow/commons/decorator/decorator.ts
index 835ef68..96daf7b 100644
--- a/src/ts/@overflow/commons/decorator/decorator.ts
+++ b/src/ts/@overflow/commons/decorator/decorator.ts
@@ -34,12 +34,14 @@ export class Decorator {
         let field: Field = null;
         let method: Method = null;
         let parameter: Parameter = null;
+        let cons: Constructor = null;
 
         switch(decoratorType) {
         case DecoratorType.CLASS:
           if (typeof(annotation.classDecorator) === 'undefined') {
             throw new Error(`Cannot apply @${name} decorator on Class.`);
           }
+          cons = clazz._defineConstructor(Metadata.getOwnParamTypes(target));
 
           clazz._addAnnotation(annotation);
 
@@ -57,7 +59,6 @@ export class Decorator {
           if (typeof(annotation.methodDecorator) === 'undefined') {
             throw new Error(`Cannot apply @${name} decorator on Method.`);
           }
-
           method = clazz._defineMethod(propertyKey,
                                        Metadata.getOwnParamTypes(target, propertyKey),
                                        Metadata.getOwnReturnType(target, propertyKey));
@@ -69,10 +70,15 @@ export class Decorator {
             throw new Error(`Cannot apply @${name} decorator on Parameter.`);
           }
 
-          method = clazz._defineMethod(propertyKey,
-                                       Metadata.getOwnParamTypes(target, propertyKey),
-                                       Metadata.getOwnReturnType(target, propertyKey));
-          parameter = method.getParameter(descriptorOrParameterIndex);
+          if (undefined === propertyKey) {
+            cons = clazz.getConstructor();
+            parameter = cons.getParameter(descriptorOrParameterIndex);
+          } else {
+            method = clazz._defineMethod(propertyKey,
+                                         Metadata.getOwnParamTypes(target, propertyKey),
+                                         Metadata.getOwnReturnType(target, propertyKey));
+            parameter = method.getParameter(descriptorOrParameterIndex);
+          }
           parameter._addAnnotation(annotation);
 
           return annotation.parameterDecorator.call(annotation, target, propertyKey, descriptorOrParameterIndex);
diff --git a/src/ts/@overflow/modules/member/reducer/member_reducer.ts b/src/ts/@overflow/modules/member/reducer/member_reducer.ts
index 6a684ab..20c0c25 100644
--- a/src/ts/@overflow/modules/member/reducer/member_reducer.ts
+++ b/src/ts/@overflow/modules/member/reducer/member_reducer.ts
@@ -9,7 +9,7 @@ import {
 @ActionMapping('@overflow/modules/member/MemberReducer')
 export default class MemberReducer {
   private name: string;
-  public constructor(@Parameter() name: string) {
+  public constructor(count: number, @Parameter() name: string) {
     this.name = name;
   }