pub/usage/.vscode/launch.json

{
  "version": "0.2.0",
  "configurations": [

    {
      "name": "Dart command line",
      "type": "dart-cli",
      "request": "launch",
      "cwd": "${workspaceRoot}",
      "debugSettings": "${command.debugSettings}",
      "program": "${workspaceRoot}/example/ga.dart",
      "args": []
    }
  ]
}