launch with Key args

launch.json

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "build",
            "type": "dart",
            "request": "launch",
            "program": "lib/main.dart",
            "args": [
                "--dart-define", "APIKEY=12345678901234567890"
            ],
        },
    ]
}