Adding type for the function instead of just Function

types/sqs-consumer/index.d.ts

@@ -6,9 +6,11 @@
 /// <reference types="node" />
 import { SQS } from "aws-sdk";
 
+export type ConsumerDone = (error?: Error) => void;
+
 export interface Options {
   queueUrl: string;
-  handleMessage(message: SQS.Message, done: Function): any;
+  handleMessage(message: SQS.Message, done: ConsumerDone): any;
   region?: string;
   attributeNames?: string[];
   messageAttributeNames?: string[];