diff --git a/packages/client/src/client.d.ts b/packages/client/src/client.d.ts
index 84075d1f..782ec48a 100644
--- a/packages/client/src/client.d.ts
+++ b/packages/client/src/client.d.ts
@@ -1,6 +1,6 @@
-import {ResponseError} from "@sendgrid/helpers/classes";
-import {ClientRequest} from "@sendgrid/client/src/request";
-import {ClientResponse} from "@sendgrid/client/src/response";
+import { ResponseError } from "@sendgrid/helpers/classes";
+import { ClientRequest } from "@sendgrid/client/src/request";
+import { ClientResponse } from "@sendgrid/client/src/response";
 
 declare class Client {
   constructor();
@@ -23,12 +23,15 @@ declare class Client {
   /**
    * Set default header
    */
-  setDefaultHeader(key: string | { [s: string]: string }, value ?: string): this;
+  setDefaultHeader(key: string | { [s: string]: string }, value?: string): this;
 
   /**
    * Set default request
    */
-  setDefaultRequest<K extends keyof ClientRequest>(key: K | ClientRequest, value ?: ClientRequest[K]): this;
+  setDefaultRequest<K extends keyof ClientRequest>(
+    key: K | ClientRequest,
+    value?: ClientRequest[K]
+  ): this;
 
   /**
    * Sets the data residency as per region provided
@@ -48,11 +51,17 @@ declare class Client {
   /**
    * Do a request
    */
-  request(data: ClientRequest, cb?: (err: ResponseError, response: [ClientResponse, any]) => void): Promise<[ClientResponse, any]>;
+  request<TResponse = object>(
+    data: ClientRequest,
+    cb?: (
+      err: ResponseError,
+      response: [ClientResponse<TResponse>, any]
+    ) => void
+  ): Promise<[ClientResponse<TResponse>, any]>;
 }
 
 declare const client: Client;
 // @ts-ignore
-export = client
+export = client;
 
-export {Client};
+export { Client };
diff --git a/packages/client/src/request.d.ts b/packages/client/src/request.d.ts
index 900454c1..3719d79f 100644
--- a/packages/client/src/request.d.ts
+++ b/packages/client/src/request.d.ts
@@ -1,3 +1,6 @@
 import RequestOptions from "@sendgrid/helpers/classes/request";
 
-export type ClientRequest = RequestOptions;
+export type ClientRequest<TData = any, TParams = any> = RequestOptions<
+  TData,
+  TParams
+>;
diff --git a/packages/client/src/response.d.ts b/packages/client/src/response.d.ts
index 3c84e373..abc88bf8 100644
--- a/packages/client/src/response.d.ts
+++ b/packages/client/src/response.d.ts
@@ -1,3 +1,3 @@
 import Response from "@sendgrid/helpers/classes/response";
 
-export type ClientResponse = Response;
+export type ClientResponse<T = object> = Response<T>;