sp-dev-fx-webparts/tutorials/helloworld-webpart/.yo-rc.json

{
  "@microsoft/generator-sharepoint": {
    "libraryName": "helloworld-webpart",
    "libraryId": "ac32f95f-bbef-49b4-8b10-0215d9b9ca1f",
    "framework": "none"
  }
}