simple.ts

import { APIGatewayEvent, APIGatewayEventRequestContext, APIGatewayProxyResult } from 'aws-lambda';

/**
 *
 * Event doc: https://docs.aws.amazon.com/apigateway/latest/developerguide/set-up-lambda-proxy-integrations.html#api-gateway-simple-proxy-for-lambda-input-format
 * @param {APIGatewayEvent} event - API Gateway Lambda Proxy Input Format
 *
 * Context doc: https://docs.aws.amazon.com/lambda/latest/dg/nodejs-prog-model-context.html
 * @param {APIGatewayEventRequestContext} context
 *
 * Return doc: https://docs.aws.amazon.com/apigateway/latest/developerguide/set-up-lambda-proxy-integrations.html
 * @returns {APIGatewayProxyResult} object - API Gateway Lambda Proxy Output Format
 *
 */
export const handler = async (event: APIGatewayEvent): Promise<APIGatewayProxyResult> => {
  let response: APIGatewayProxyResult;

  try {
    response = {
      statusCode: 200,
      body: JSON.stringify({
        message: 'hello simple world!',
      }),
    };
  } catch (err) {
    console.log(err);
    return err;
  }

  return response;
};