How to debug a Node.js server written in TypeScript running in Docker

launch.json5

{
  "version": "0.2.0",
  "configurations": [
    {
      "type": "node",
      "request": "attach",
      "name": "Attach to Server in Docker",
      "port": 9222,
      "timeout": 10000,
      "stopOnEntry": true,
      "cwd": "${workspaceFolder}/app/server", // the root where everything is based on
      "localRoot": "${workspaceFolder}/app/server", // root of all server files
      "remoteRoot": "/server", // workspace path which was set in the dockerfile
      "outFiles": ["${workspaceFolder}/app/server/dist/src/**/*.js"], // all compiled JavaScript files
      "sourceMaps": true,
      "internalConsoleOptions": "neverOpen"
    }
  ]
}

I had to use .json5 to allow comments in the JSON file. The filename should actually be launch.json.