sp-dev-fx-webparts/samples/js-theme-manager-2019/.yo-rc.json

{
  "@microsoft/generator-sharepoint": {
    "isCreatingSolution": true,
    "environment": "onprem19",
    "version": "1.8.1",
    "libraryName": "js-theme-manager-2019",
    "libraryId": "13993f26-4e3c-4518-9ef0-97da21759508",
    "packageManager": "npm",
    "componentType": "webpart"
  }
}