sp-dev-fx-webparts/samples/react-peoplepicker/.yo-rc.json

{
  "@microsoft/generator-sharepoint": {
    "version": "1.3.0",
    "libraryName": "spfx-office-ui-fabric-people-picker",
    "libraryId": "6349ba8f-d5aa-4cbf-87b4-910dad47324b",
    "environment": "spo"
  }
}