VS Code not hitting breakpoints for Node app running in Docker Container

Question

Summary

I'm running a node app inside a docker container can't get the VS code debugger to hit breakpoints.

Docker Setup

The docker container exposes port 5859. Inside the container the node app is ran with this command:

nodemon -L --watch src --exec babel-node src/server.js -- --inspect=0.0.0.0:5859 --nolazy

It reports that the debugger is listening:

[nodemon] 1.19.0
[nodemon] to restart at any time, enter `rs`
[nodemon] watching: /app/src/**/*
[nodemon] starting `babel-node src/server.js --inspect=0.0.0.0:5859 --nolazy`
Debugger listening on ws://0.0.0.0:5859/5939f6b6-5ade-4ce5-9694-7df5f5b8385b
For help, see: https://nodejs.org/en/docs/inspector

VS Code Setup

And when I fire up the debug profile in VS Code it appears to attach. Below is line from the logs of the running docker container. However, no breakpoints are hit when I set them. Is this a babel-node issue? Is there any suggested path forward to get node debugging to work with babel-node?

My VS Code debug config:

  {
        "type": "node",
        "request": "attach",
        "name": "Docker: GraphQL",
        "port": 5859,
        "protocol": "inspector",
        "restart": true,
        "remoteRoot": "/app",
        "localRoot": "${workspaceFolder}"
    }

Answer 1

I was not able to get this to work with nodemon, but modifying my .babelrc file to include inline source maps triggered VS code to hit the breakpoints I set. My .babelrc file looks like this:

{
    "env": {
        "production": {
            "presets": [
                ["es2015", {"modules": false}],
                "stage-1"
            ]
        },
        "development": {
            "presets": [
                ["es2015"],
                "stage-1"
            ], 
            "sourceMaps": "inline",
            "retainLines": true
        }    }
}

And the corresponding script that docker calls in package.json. Port 5859 is exposed in the docker-compose file.

"start:docker": "babel-node src/server.js --inspect=0.0.0.0:5859 --nolazy",