diff --git a/index.d.ts b/index.d.ts
index a7e7493..7075cc6 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -62,6 +62,15 @@ declare module "skygear" {
     constructor(name: string);
   }
 
+  // NOTE(limouren): Node doesn't have Blob. Copy the type definition here to
+  // make tsc happy.
+  // https://github.com/Microsoft/TypeScript/blob/8794ebdff5c00a92bb197a5afba02d573681538e/src/lib/dom.generated.d.ts#L2233
+  interface Blob {
+    readonly size: number;
+    readonly type: string;
+    slice(start?: number, end?: number, contentType?: string): Blob;
+  }
+
   // NOTE(louis): I do not want to copy this but
   // in react native environment we cannot use --lib DOM
   // so File is undefined.
@@ -490,6 +499,9 @@ declare module "skygear" {
 }
 
 declare module "skygear/cloud" {
+  import { Fields, Files } from "formidable";
+  import { Url } from "url";
+
   export interface OpParams {
     action: string;
     args: Array<any>;
@@ -536,26 +548,82 @@ declare module "skygear/cloud" {
     options?: EventOptions
   ): void;
 
-  export interface handlerOptions {
+  export function handler(
+    path: string,
+    func: HandlerFunc,
+    options?: HandlerOptions
+  ): void;
+
+  export type HandlerFunc = (
+    req: SkygearRequest,
+    options: HandlerFunc.Options
+  ) => any;
+  export namespace HandlerFunc {
+    interface Options {
+      context: { [key: string]: any };
+      container: CloudCodeContainer;
+    }
+  }
+
+  export interface HandlerOptions {
     method?: string[] | string;
     keyRequired?: boolean;
     userRequired?: boolean;
   }
 
-  export type handlerReq = any;
+  export class SkygearRequest {
+    constructor(param: SkygearRequest.Param);
 
-  export type handlerFuncOptions = any;
+    header: { [key: string]: string };
+    method: string;
+    path: string;
+    queryString: string;
+    body: string;
+    url: Url;
 
-  export type handlerFunc = (
-    req: handlerReq,
-    options: handlerFuncOptions
-  ) => any;
+    query: string;
+    json: any;
 
-  export function handler(
-    path: string,
-    func: handlerFunc,
-    options?: handlerOptions
-  ): void;
+    form(callback: SkygearRequest.FormCallback): void;
+  }
+  export namespace SkygearRequest {
+    interface Param {
+      header: { [key: string]: string };
+      method: string;
+      path: string;
+      query_string: string;
+      body: string;
+      url: string;
+    }
+
+    // it is the callback from formidable parse
+    type FormCallback = (err: any, fields: Fields, files: Files) => any;
+  }
+
+  export class SkygearResponse {
+    constructor(options: SkygearResponse.Options);
+
+    setHeader(name: string, value: string): void;
+    getHeader(name: string): string | undefined;
+    removeHeader(name: string): void;
+
+    write(chunk: string): void;
+
+    toResultJSON(): { [key: string]: any };
+  }
+  export namespace SkygearResponse {
+    interface Options {
+      headers?: { [key: string]: string };
+      statusCode?: number;
+      body?: string;
+    }
+
+    interface ResultJSON {
+      header: { [key: string]: string };
+      status: number;
+      body: string;
+    }
+  }
 
   export type ProviderCls = Function;
 
diff --git a/package.json b/package.json
index ede04c3..083ee5e 100644
--- a/package.json
+++ b/package.json
@@ -3,7 +3,13 @@
   "version": "0.4.0",
   "main": "index.js",
   "license": "Apache-2.0",
-  "files": ["index.d.ts"],
+  "files": [
+    "index.d.ts"
+  ],
+  "dependencies": {
+    "@types/formidable": "*",
+    "@types/node": "*"
+  },
   "devDependencies": {
     "typescript": "2.9.2"
   },
diff --git a/test/test.ts b/test/test.ts
index 7331c04..08e1222 100644
--- a/test/test.ts
+++ b/test/test.ts
@@ -42,6 +42,16 @@ skygearCloud.handler(
   }
 );
 
+skygearCloud.handler("skygearResponse", function() {
+  return new skygearCloud.SkygearResponse({
+    statusCode: 404,
+    headers: {
+      "Content-Type": "application/json"
+    },
+    body: '{"a": "b"}'
+  });
+});
+
 class ProviderCls {}
 skygearCloud.provides("auth", "com.facebook", ProviderCls);
 
@@ -132,7 +142,6 @@ const requestData = {
 };
 container.makeRequest("auth:signup", requestData);
 
-
 skygear
   .lambda("user:signup", { payload: { user: "123", password: "456" } })
   .then(response => {
@@ -148,6 +157,8 @@ skygear.auth._authResolve(record).then(r => {
   console.log(r);
 });
 
-getSigner().sign("asset_id").then(url => {
-  console.log(url);
-});
+getSigner()
+  .sign("asset_id")
+  .then(url => {
+    console.log(url);
+  });
diff --git a/yarn.lock b/yarn.lock
index 7ec0734..e7a49db 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2,6 +2,24 @@
 # yarn lockfile v1
 
 
+"@types/events@*":
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/@types/events/-/events-3.0.0.tgz#2862f3f58a9a7f7c3e78d79f130dd4d71c25c2a7"
+  integrity sha512-EaObqwIvayI5a8dCzhFrjKzVwKLxjoG9T6Ppd5CEo07LRKfQ8Yokw54r5+Wq7FaBQ+yXRvQAYPrHwya1/UFt9g==
+
+"@types/formidable@*":
+  version "1.0.31"
+  resolved "https://registry.yarnpkg.com/@types/formidable/-/formidable-1.0.31.tgz#274f9dc2d0a1a9ce1feef48c24ca0859e7ec947b"
+  integrity sha512-dIhM5t8lRP0oWe2HF8MuPvdd1TpPTjhDMAqemcq6oIZQCBQTovhBAdTQ5L5veJB4pdQChadmHuxtB0YzqvfU3Q==
+  dependencies:
+    "@types/events" "*"
+    "@types/node" "*"
+
+"@types/node@*":
+  version "11.9.5"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-11.9.5.tgz#011eece9d3f839a806b63973e228f85967b79ed3"
+  integrity sha512-vVjM0SVzgaOUpflq4GYBvCpozes8OgIIS5gVXVka+OfK3hvnkC1i93U8WiY2OtNE4XUWyyy/86Kf6e0IHTQw1Q==
+
 typescript@2.9.2:
   version "2.9.2"
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-2.9.2.tgz#1cbf61d05d6b96269244eb6a3bce4bd914e0f00c"