diff --git a/package.json b/package.json
index 628a4aced..8c92edb2a 100644
--- a/package.json
+++ b/package.json
@@ -11,6 +11,7 @@
     "@babel/cli": "^7.7.7",
     "@babel/core": "^7.7.7",
     "@babel/node": "^7.7.7",
+    "@types/node": "17.0.41",
     "chai": "4.2.0",
     "chai-as-promised": "^7.1.1",
     "dirty-chai": "^2.0.1",
diff --git a/packages/mail/src/mail.d.ts b/packages/mail/src/mail.d.ts
index fa827498d..735e05898 100644
--- a/packages/mail/src/mail.d.ts
+++ b/packages/mail/src/mail.d.ts
@@ -7,12 +7,12 @@ declare class MailService {
   /**
    * SendGrid API key passthrough for convenience.
    */
-  setApiKey(apiKey: string): void;
+  setApiKey(apiKey: string): this;
 
   /**
    * Client to use for invoking underlying API
    */
-  setClient(client: Client): void;
+  setClient(client: Client): this;
 
   /**
    * Twilio Email Auth passthrough for convenience.
@@ -27,7 +27,7 @@ declare class MailService {
   /**
    * Set substitution wrappers
    */
-  setSubstitutionWrappers(left: string, right: string): void;
+  setSubstitutionWrappers(left: string, right: string): this;
 
   /**
    * Send email
diff --git a/packages/mail/src/mail.spec.js b/packages/mail/src/mail.spec.js
index 09698baa2..66953e8fe 100644
--- a/packages/mail/src/mail.spec.js
+++ b/packages/mail/src/mail.spec.js
@@ -132,5 +132,16 @@ describe('sgMail.send()', () => {
       sgMail.send(data, false, {});
     }).to.throw(Error);
   });
+
+  it("can be chained", () => {
+    const sgMailChain = require('./mail');
+    sgMailChain.client.setDefaultHeader('X-Mock', 202)
+    sgMailChain
+      .setApiKey('SendGrid API Key')
+      .send(data)
+      .then(([response, body]) => {
+        expect(response.statusCode).to.equal(202);
+      });
+  })
 });
 
diff --git a/test/typescript/mail.ts b/test/typescript/mail.ts
index fb8199860..e60aa2c5a 100644
--- a/test/typescript/mail.ts
+++ b/test/typescript/mail.ts
@@ -1,5 +1,5 @@
 import { Client } from "@sendgrid/client";
-import sgMail = require("@sendgrid/mail");
+import sgMail from "@sendgrid/mail";
 
 // Test setClient() method
 sgMail.setClient(new Client());
@@ -277,3 +277,14 @@ sgMail.send({
   mailSettings: {},
   trackingSettings: {},
 });
+
+//supports chaining with ts
+sgMail.setClient(new Client())
+  .setApiKey("MY_SENDGRID_API_KEY")
+  .send({
+    to: 'recipient@example.org',
+    from: 'sender@example.org',
+    subject: 'Hello email with categories',
+    html: '<p>Some email content</p>',
+    category: 'transactional',
+  });
\ No newline at end of file
diff --git a/tsconfig.json b/tsconfig.json
index b8d1ada33..721048c7d 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,6 +1,7 @@
 {
     "compilerOptions": {
         "noEmit": true,
+        "esModuleInterop": true,
         "module": "commonjs",
         "target": "es6",
         "baseUrl": ".",