app.ts

import 'source-map-support/register'

import { APIGatewayProxyEvent, APIGatewayProxyResult, Context } from "aws-lambda";

let response;

export async function lambdaHandler(event: APIGatewayProxyEvent, context: Context): Promise<APIGatewayProxyResult> {
    try {
        // const ret = await axios(url);
        response = {
            'statusCode': 200,
            'body': JSON.stringify({
                message: 'hello world',
                // location: ret.data.trim()
            })
        }
        throw new Error("zzz");
    } catch (err) {
        console.log(err);
        return err;
    }

    return response
};

launch.json

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Orig",
            "type": "node",
            "request": "attach",
            "address": "localhost",
            "port": 5858,
            // From the sam init example, it would be "${workspaceRoot}/hello_world"
            "localRoot": "${workspaceRoot}/hello-world",
            "remoteRoot": "/var/task",
            "protocol": "inspector",
            "stopOnEntry": false,
            "sourceMapPathOverrides": {
                "webpack:///./~/*": "${workspaceRoot}/hello-world/node_modules/*",
                "webpack:///./*": "${workspaceRoot}/hello-world/*",
                "webpack:///*": "*"
            }
        }
]
}

package.json

{
  "name": "hello_world",
  "version": "1.0.0",
  "description": "hello world sample for NodeJS",
  "main": "app.js",
  "repository": "https://github.com/awslabs/aws-sam-cli/tree/develop/samcli/local/init/templates/cookiecutter-aws-sam-hello-nodejs",
  "author": "SAM CLI",
  "license": "MIT",
  "dependencies": {
    "axios": "^0.18.0",
    "source-map-support": "^0.5.12"
  },
  "scripts": {
    "tsc": "rimraf build && tsc -p tsconfig.json",
    "webpack": "webpack-cli src/app.ts -c webpack.config.js -o build/app.js",
    "webpack:watch": "webpack-cli src/app.ts -c webpack.config.js -o build/app.js -w",
    "test": "jest"
  },
  "devDependencies": {
    "@babel/core": "^7.4.5",
    "@babel/preset-env": "^7.4.5",
    "@types/aws-lambda": "^8.10.27",
    "@types/jest": "^24.0.13",
    "babel-loader": "^8.0.6",
    "jest": "^24.8.0",
    "rimraf": "^2.6.3",
    "ts-jest": "^24.0.2",
    "ts-loader": "^6.0.2",
    "typescript": "^3.5.1",
    "webpack": "^4.33.0",
    "webpack-cli": "^3.3.3"
  }
}

template.yaml

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: >
  js-test

  Sample SAM Template for js-test
  
# More info about Globals: https://github.com/awslabs/serverless-application-model/blob/master/docs/globals.rst
Globals:
  Function:
    Timeout: 3

Resources:
  HelloWorldFunction:
    Type: AWS::Serverless::Function # More info about Function Resource: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#awsserverlessfunction
    Properties:
      CodeUri: hello-world
      Handler: build/app.lambdaHandler
      Runtime: nodejs8.10
      Events:
        HelloWorld:
          Type: Api # More info about API Event Source: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#api
          Properties:
            Path: /hello
            Method: get

Outputs:
  # ServerlessRestApi is an implicit API created out of Events key under Serverless::Function
  # Find out more about other implicit resources you can reference within SAM
  # https://github.com/awslabs/serverless-application-model/blob/master/docs/internals/generated_resources.rst#api
  HelloWorldApi:
    Description: "API Gateway endpoint URL for Prod stage for Hello World function"
    Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/hello/"
  HelloWorldFunction:
    Description: "Hello World Lambda Function ARN"
    Value: !GetAtt HelloWorldFunction.Arn
  HelloWorldFunctionIamRole:
    Description: "Implicit IAM Role created for Hello World function"
    Value: !GetAtt HelloWorldFunctionRole.Arn

tsconfig.json

{
    "compilerOptions": {
      "target": "es2015",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
      "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
      "allowJs": true,                       /* Allow javascript files to be compiled. */
      "checkJs": true,                       /* Report errors in .js files. */
      "sourceMap": true,                     /* Generates corresponding '.map' file. */
      "outDir": "./build",                        /* Redirect output structure to the directory. */
      "esModuleInterop": true                   /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
    },
    "include": ["src/**/*"]
  }
  

webpack.config.js

module.exports = {
  devtool: "source-map",
  resolve: {
    extensions: [".js", ".jsx", ".ts", ".tsx"]
  },
  output: {
    libraryTarget: 'commonjs2'
  },
  target: "node",
  module: {
    rules: [
      {
        test: /\.m?js$/,
        exclude: /(node_modules|bower_components)/,
        use: {
          loader: "babel-loader",
          options: {
            presets: ["@babel/preset-env"]
          }
        }
      },
      {
        test: /\.tsx?$/,
        loader: "ts-loader"
      }
    ]
  },

  mode: "development"
};