aspnetcore/src/JSInterop/JSInterop.slnf

{
  "solution": {
    "path": "..\\..\\Extensions.sln",
    "projects": [
      "src\\JSInterop\\Microsoft.JSInterop\\src\\Microsoft.JSInterop.csproj",
      "src\\JSInterop\\Microsoft.JSInterop\\test\\Microsoft.JSInterop.Tests.csproj"
    ]
  }
}