global.json

{
  "tools": {
    "dotnet": "3.0.100-preview5-011568",
    "runtimes": {
      "dotnet/x64": [
        "2.1.11"
      ]
    }
  },
  "sdk": {
    "version": "3.0.100-preview5-011568"
  },
  "msbuild-sdks": {
    "Microsoft.DotNet.Arcade.Sdk": "1.0.0-beta.19273.11",
    "Microsoft.DotNet.Helix.Sdk": "2.0.0-beta.19273.11"
  }
}