message: Improves TS template method signature
diff: -import { APIGatewayProxyResult } from "aws-lambda";
  +import { APIGatewayProxyHandler } from "aws-lambda";
  -export async function handler(): Promise<APIGatewayProxyResult> {
  +export const handler: APIGatewayProxyHandler = async (event) => {
  return {
  statusCode: 200,
  - body: "Hello World!",
  + body: `Hello world from account: ${event.requestContext.accountId}`,
  headers: { "Content-Type": "text/plain" },
  };
  }
  