try write

lambdas/package.json

@@ -11,7 +11,8 @@
   },
   "dependencies": {
     "@middy/core": "^3.4.0",
-    "@middy/http-json-body-parser": "^3.4.0"
+    "@middy/http-json-body-parser": "^3.4.0",
+    "aws-sdk": "^2.1234.0"
   },
   "devDependencies": {
     "@serverless/typescript": "^3.0.0",

lambdas/src/functions/hello/handler.ts

@@ -4,11 +4,42 @@ import { middyfy } from '@libs/lambda';
 
 import schema from './schema';
 
+import AWS from 'aws-sdk/global';
+import S3 from 'aws-sdk/clients/s3';
+const  s3 = new S3();
+
 const hello: ValidatedEventAPIGatewayProxyEvent<typeof schema> = async (event) => {
+  await writeData();
   return formatJSONResponse({
     message: `Hello ${event.body.name}, welcome to the exciting Serverless world!`,
     event,
   });
 };
 
+
+const writeData = async () => {
+  try {
+
+    const obj = {
+        firstname: "Navjot",
+        lastname: "Dhanawat"
+    };
+  
+    const buf = Buffer.from(JSON.stringify(obj));
+  
+    const data = {
+        Bucket: 'mockdist.tea.xyz',
+        Key: 'packages.json',
+        Body: buf,
+        ContentEncoding: 'base64',
+        ContentType: 'application/json',
+        ACL: 'public-read'
+    };
+  
+    await s3.upload(data);
+  } catch (error) {
+    console.error(error);
+  }
+}
+
 export const main = middyfy(hello);

lambdas/tsconfig.json

@@ -8,7 +8,8 @@
     "removeComments": true,
     "sourceMap": true,
     "target": "ES2020",
-    "outDir": "lib"
+    "outDir": "lib",
+    "allowSyntheticDefaultImports": true 
   },
   "include": ["src/**/*.ts", "serverless.ts"],
   "exclude": [

lambdas/yarn.lock

@@ -457,6 +457,22 @@ aws-sdk@^2.1231.0:
     uuid "8.0.0"
     xml2js "0.4.19"
 
+aws-sdk@^2.1234.0:
+  version "2.1234.0"
+  resolved "https://registry.yarnpkg.com/aws-sdk/-/aws-sdk-2.1234.0.tgz#2a3883295c77c789f8a95fbadc0fd37a998ac026"
+  integrity sha512-QFuSeYM8DPiXytspLnWToy4MWJPGYFCgAy4hi+lRd6ueJtCey7MBIgFNHW814uAJzKUDEdJUJZPvDZvtLM1d/Q==
+  dependencies:
+    buffer "4.9.2"
+    events "1.1.1"
+    ieee754 "1.1.13"
+    jmespath "0.16.0"
+    querystring "0.2.0"
+    sax "1.2.1"
+    url "0.10.3"
+    util "^0.12.4"
+    uuid "8.0.0"
+    xml2js "0.4.19"
+
 axios@^0.21.1:
   version "0.21.4"
   resolved "https://registry.yarnpkg.com/axios/-/axios-0.21.4.tgz#c67b90dc0568e5c1cf2b0b858c43ba28e2eda575"