Localstack serverless typescript debug

Platform
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1

Hello!

I try to debug my serverless application in vscode using localstack deploy but I failed!

I’m doing some tests with localstack where I use typescript in my lambda and is triggered by an SQS, which is why I was trying to debug it with localstack.

Some problems I’m facing:

  • The breakpoint only works once, on the first call to the route. After that, it never falls to the breakpoint again. (and the breakpoint isnt the correct one)
  • The breakpoint points to the .js file and not my .ts (I added sourceMaps and it still falls to .js)

launch.json

{
  "version": "0.2.0",
  "configurations": [
    {
      "address": "127.0.0.1",
      "localRoot": "${workspaceFolder}",
      "name": "Attach to Remote Node.js",
      "port": 9229,
      "remoteRoot": "/var/task/",
      "request": "attach",
      "type": "node",
      "sourceMaps": true,
      "preLaunchTask": "Wait Remote Debugger Server"
  },
  ]
}

tasks.json

{
  "version": "2.0.0",
  "tasks": [
      {
        "label": "Wait Remote Debugger Server",
        "type": "shell",
        "command": "while [[ -z $(docker ps | grep :9229) ]]; do sleep 1; done; sleep 1;"
      }
  ]
}

docker-compose

version: '3.8'

services:
  localstack:
    container_name: client-localstack
    image: localstack/localstack:latest
    ports:
      - '4566:4566'
      - '4571:4571'
    environment:
      - SERVICES=s3,sns,sqs,lambda,apigateway
      - DEBUG=1
      - DATA_DIR=/tmp/localstack/data
      - LAMBDA_EXECUTOR=docker
      - LAMBDA_REMOTE_DOCKER=false
      - LAMBDA_DOCKER_FLAGS=-e NODE_OPTIONS=--inspect-brk=0.0.0.0:9229 -p 9229:9229
      - DOCKER_HOST=unix:///var/run/docker.sock
      - AWS_ACCESS_KEY_ID=test
      - AWS_SECRET_ACCESS_KEY=test
    volumes:
      - './.localstack:/tmp/localstack'
      - '/var/run/docker.sock:/var/run/docker.sock'

Thank you for your time

2

Hello @jrzaghetto,

Please update your docker-compose.yml file and remove the deprecated configuration.
You can use the default docker-compose.yml.

You can find the legacy variables in Configuration | Docs (localstack.cloud).

Please check with the provided sample to ensure that the Remote Debugging is working before you use your custom setup.

3

The default configuration works, but only when I’m using javascript + node

In my case I want to use typescript + node. I didn’t find any reference anywhere, since with typescript you have to make it recognize sourceMaps

I need help with this, a debug configuration for serverless typescript + localstack + docker + debug

4

Hi,

Can you install the esbuild package in your project and configure a build step in this manner:

"scripts": {
    "build": "esbuild index.ts --bundle --minify --sourcemap --platform=node --target=es2020 --outfile=dist/index.js --watch"
  },

You can run the build script to create the dist/index.js file. While creating the Lambda function, you can reference this as:

awslocal lambda create-function \
    --function-name hello-world \
    --runtime "nodejs18.x" \
    --role arn:aws:iam::123456789012:role/lambda-ex \
    --code S3Bucket="hot-reload",S3Key="$(PWD)/dist" \
    --handler index.handler

I hope this would enable you to make it work. Please let us know, if it doesn’t and we will try to set a small sample application for you :+1: