diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6345bf0..70d1c4a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+<a name="1.1.6"></a>
+## [1.1.6](https://github.com/dreambo8563/vue-lazy-calc/compare/v1.1.5...v1.1.6) (2019-03-21)
+
+
+
 <a name="1.1.5"></a>
 ## [1.1.5](https://github.com/dreambo8563/vue-lazy-calc/compare/v1.1.4...v1.1.5) (2019-03-21)
 
diff --git a/jest.config.js b/jest.config.js
index b113645..17a4b95 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -21,5 +21,10 @@ module.exports = {
   testMatch: [
     "**/tests/unit/**/*.spec.(js|jsx|ts|tsx)|**/__tests__/*.(js|jsx|ts|tsx)"
   ],
-  testURL: "http://localhost/"
+  testURL: "http://localhost/",
+  globals: {
+    "ts-jest": {
+      diagnostics: false
+    }
+  }
 };
diff --git a/package-lock.json b/package-lock.json
index fd53571..cf6ae66 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "vue-lazy-calc",
-  "version": "1.1.5",
+  "version": "1.1.6",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 942d85f..e19b080 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "vue-lazy-calc",
-  "version": "1.1.5",
+  "version": "1.1.6",
   "private": false,
   "author": "dreambo8563",
   "main": "dist/vue-lazy-calc.umd.min.js",
diff --git a/src/main.ts b/src/main.ts
index a909e92..3e5ccd5 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -9,7 +9,7 @@ export interface ILazyBase {
   stream(s?: LazyCalc): LazyStream;
 }
 export class LazyBase {
-  constructor() {}
+  // constructor() {}
   static lazy(init: number | object = 0): LazyCalc {
     return new LazyCalc(init);
   }
diff --git a/tests/unit/main.spec.ts b/tests/unit/main.spec.ts
index a44c4d7..3365cba 100644
--- a/tests/unit/main.spec.ts
+++ b/tests/unit/main.spec.ts
@@ -1,4 +1,7 @@
-import { LazyBase } from "../../src/main";
+///<reference path="../../types/main.d.ts">
+///<reference path="../../types/vue.d.ts">
+import LazyPlugin, { LazyBase } from "../../src/main";
+import Vue from "vue";
 
 describe("base class", () => {
   it("lazy with init value", () => {
@@ -11,4 +14,19 @@ describe("base class", () => {
     const stream1 = LazyBase.stream(base1).add(base2);
     expect(stream1.value()).toBe(5);
   });
+  it("stream without init value", () => {
+    const base1 = LazyBase.lazy(1);
+    const base2 = LazyBase.lazy(4);
+    const stream1 = LazyBase.stream()
+      .subtract(base1)
+      .add(base2);
+    expect(stream1.value()).toBe(3);
+  });
+  it("Vue instantce", () => {
+    Vue.use(LazyPlugin);
+    const base1 = Vue.$lzCalc.lazy(1);
+    const base2 = Vue.$lzCalc.lazy(4);
+    const stream1 = Vue.$lzCalc.stream(base1).add(base2);
+    expect(stream1.value()).toBe(5);
+  });
 });
diff --git a/tsconfig.json b/tsconfig.json
index 39380eb..84cb439 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -13,7 +13,7 @@
     "baseUrl": ".",
     "types": ["jest", "webpack-env"],
     "declaration": true,
-    // "typeRoots": ["types"],
+    // "typeRoots": ["types", "node_modules/@types"],
     "outDir": "./types",
     "paths": {
       "@/*": ["src/*"]
@@ -24,7 +24,7 @@
     "src/**/*.ts",
     "src/**/*.tsx",
     "src/**/*.vue"
-    // "tests/**/*.ts",
+    // "tests/**/*.ts"
     // "tests/**/*.tsx"
   ],
   "exclude": ["node_modules"]
diff --git a/types/main.d.ts b/types/main.d.ts
index 93232f1..d48fa82 100644
--- a/types/main.d.ts
+++ b/types/main.d.ts
@@ -8,7 +8,6 @@ export interface ILazyBase {
   stream(s?: LazyCalc): LazyStream;
 }
 export declare class LazyBase {
-  constructor();
   static lazy(init?: number | object): LazyCalc;
   static stream(s?: LazyCalc): LazyStream;
 }