tests/lib/isolate/scenarios/package_relative_root/.dart_tool/package_config.json

{
  "configVersion": 2,
  "packages": [
    {
      "name": "foo",
      "rootUri": "../packages/foo",
      "languageVersion": "2.9"
    },
    {
      "name": "bar",
      "rootUri": "../packages/bar",
      "languageVersion": "2.9"
    }
  ]
}