diff --git a/types/wepy/app.d.ts b/types/wepy/app.d.ts
index cc2636ed92..9389b0400f 100644
--- a/types/wepy/app.d.ts
+++ b/types/wepy/app.d.ts
@@ -8,6 +8,25 @@ export interface AppConstructor {
     new (): app;
 }
 
+/* the supported add-ons */
+export type AddOn = "requestfix" | "promisify";
+
+export interface WindowConfig {
+    backgroundTextStyle: string;
+    navigationBarBackgroundColor: string;
+    navigationBarTitleText: string;
+    navigationBarTextStyle: string;
+}
+
 export default class app {
-    $init(wepy: any, config: AppConfig): any;
+    config: {
+        window: WindowConfig;
+        pages: string[];
+    };
+    $init(wepy: any, config: AppConfig): void;
+    use(addonName: AddOn, ...args: any[]): void;
+    $initAPI(
+        wepy: any,
+        noPromiseAPI: string[] | { [name: string]: boolean }
+    ): void;
 }
diff --git a/types/wepy/wepy-tests.ts b/types/wepy/wepy-tests.ts
index 9ed5462fb9..d9794f6e8b 100644
--- a/types/wepy/wepy-tests.ts
+++ b/types/wepy/wepy-tests.ts
@@ -1,5 +1,11 @@
 import wepy from "wepy";
 
+export class MyApp extends wepy.app {
+    async onLoad() {
+        this.use("requestfix");
+    }
+}
+
 export class MyComponent extends wepy.component {
     data = {
         reveal: false,