I’m encountering unbound breakpoints in VSCode when debugging a TypeScript project running in Docker.

Despite this, breakpoints remain unbound. What could be causing this issue and how can I resolve it?

My setup includes a launch.json configuration to attach to Node.js processes. Here’s my launch.json:

{
    "version": "0.2.0",
    "configurations": [
        {
            "name" : "collector",
            "type": "node",
            "request": "attach",
            "port": 9229,
            "restart": true,
            "localRoot": "${workspaceFolder}",
            "remoteRoot": "/app",
            "sourceMaps": true
        },
        {
            "name" : "worker",
            "type": "node",
            "request": "attach",
            "port": 9230,
            "restart": true,
            "localRoot": "${workspaceFolder}",
            "remoteRoot": "/app",
            "sourceMaps": true
        }
    ]
}

My tsconfig.json has sourceMap enabled, and my Docker setup mounts the project to /app:

{
  "compilerOptions": {
    "target": "es2022",
    "lib": ["ES2022"],
    "module": "node16",
    "moduleResolution": "node16",
    "outDir": "./dist",
    "module": "nodenext",
    "moduleResolution": "nodenext",
    "esModuleInterop": true,
    "forceConsistentCasingInFileNames": true,
    "strict": true,
    "skipLibCheck": true,
    "sourceMap": true
  }
}

collector:
    build:
      context: .
      target: collector
    depends_on:
      - postgres
      - redis
    environment:
    ......
    ports:
      - 3000:3000
      - 9229:9229 # Debug port
    volumes:
      - ./collector:/app/collector:ro
      - ./shared:/app/shared:ro
    command: [
      "npx", 
      "nodemon", 
      "--signal", "SIGINT", 
      "--nolazy",
      "--watch", "collector/**/*.ts", 
      "--watch", "shared/**/*.ts", 
      "--ext", "ts",
      "--exec", "node --inspect=0.0.0.0:9229 -r ts-node/register",         
      "collector/server.ts", 
    ]

  workers:
    build:
      context: .
      target: workers
    depends_on:
      - postgres
      - redis
    environment:
    ....
    ports:
      - 9230:9229 # Debug port
    volumes:
      - ./workers:/app/workers:ro
      - ./shared:/app/shared:ro
    command: [
      "npx", 
      "nodemon",
      "--signal", "SIGINT", 
      "--nolazy",
      "--watch", "workers/**/*.ts", 
      "--watch", "shared/**/*.ts", 
      "--ext", "ts", 
      "--exec", "node --inspect=0.0.0.0:9229 -r ts-node/register",    
      "workers/master.ts"
    ]

Directory structure

.
├── collector
└── workers
├── node_modules
├── postgres
├── prisma
├── redis
├── shared
├── package.json
├── tsconfig.json