diff --git a/CHANGELOG.md b/CHANGELOG.md
index e0d8e7e..6345bf0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,23 @@
+<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)
+
+
+### Bug Fixes
+
+* **typings:** add IBase ([263c997](https://github.com/dreambo8563/vue-lazy-calc/commit/263c997))
+
+
+
+<a name="1.1.4"></a>
+## [1.1.4](https://github.com/dreambo8563/vue-lazy-calc/compare/v1.1.3...v1.1.4) (2019-03-21)
+
+
+### Bug Fixes
+
+* **typings:** root type ([c3d0055](https://github.com/dreambo8563/vue-lazy-calc/commit/c3d0055))
+
+
+
 <a name="1.1.3"></a>
 ## [1.1.3](https://github.com/dreambo8563/vue-lazy-calc/compare/v1.1.2...v1.1.3) (2019-03-21)
 
diff --git a/package-lock.json b/package-lock.json
index ca615bf..fd53571 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "vue-lazy-calc",
-  "version": "1.1.3",
+  "version": "1.1.5",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 016944b..942d85f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "vue-lazy-calc",
-  "version": "1.1.3",
+  "version": "1.1.5",
   "private": false,
   "author": "dreambo8563",
   "main": "dist/vue-lazy-calc.umd.min.js",
diff --git a/src/main.ts b/src/main.ts
index ca57c20..a909e92 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -4,6 +4,10 @@ import { LazyCalc } from "./simple";
 export type operatorFunc = (i: number | string) => number;
 export type CalcMethod = "ceil" | "floor" | "round";
 
+export interface ILazyBase {
+  lazy(init?: number | object): LazyCalc;
+  stream(s?: LazyCalc): LazyStream;
+}
 export class LazyBase {
   constructor() {}
   static lazy(init: number | object = 0): LazyCalc {
@@ -20,7 +24,7 @@ export type LzCalcPlugin = {
 const instantce: LzCalcPlugin = {
   install(vue, options) {
     let alias = "$lzCalc";
-    vue.prototype[alias] = LazyBase;
+    vue.prototype[alias] = LazyBase as ILazyBase;
     Object.defineProperty(Vue, `${alias}`, {
       get() {
         return LazyBase;
diff --git a/src/stream.ts b/src/stream.ts
index 81cafcd..76740a9 100644
--- a/src/stream.ts
+++ b/src/stream.ts
@@ -1,5 +1,6 @@
 import { operatorFunc, CalcMethod } from "./main";
 import { LazyCalc } from "./simple";
+
 class LazyStream {
   private operators: operatorFunc[];
   private compose = (fns: operatorFunc[]) =>
diff --git a/types/main.d.ts b/types/main.d.ts
index bd19588..93232f1 100644
--- a/types/main.d.ts
+++ b/types/main.d.ts
@@ -3,6 +3,10 @@ import LazyStream from "./stream";
 import { LazyCalc } from "./simple";
 export declare type operatorFunc = (i: number | string) => number;
 export declare type CalcMethod = "ceil" | "floor" | "round";
+export interface ILazyBase {
+  lazy(init?: number | object): LazyCalc;
+  stream(s?: LazyCalc): LazyStream;
+}
 export declare class LazyBase {
   constructor();
   static lazy(init?: number | object): LazyCalc;
diff --git a/types/vue.d.ts b/types/vue.d.ts
index 0908ec9..da78bdd 100644
--- a/types/vue.d.ts
+++ b/types/vue.d.ts
@@ -1,17 +1,17 @@
 import Vue, { VueConstructor } from "vue";
-import { LazyCalc } from "./simple";
+import { ILazyBase } from "./main";
 declare module "vue/types/vue" {
   interface Vue {
-    $lzCalc: LazyCalc;
+    $lzCalc: ILazyBase;
   }
   interface VueConstructor {
-    $lzCalc: LazyCalc;
+    $lzCalc: ILazyBase;
   }
 }
 
 declare module "vue/types/options" {
   interface ComponentOptions<V extends Vue> {
-    $lzCalc?: LazyCalc;
+    $lzCalc?: ILazyBase;
   }
 }