sp-dev-fx-webparts/samples/react-yammer-api/config/package-solution.json

{
  "solution": {
    "name": "react-yammer-api-client-side-solution",
    "id": "9e199a26-c09f-4071-9902-ee8e40e80f16",
    "version": "1.0.0.0"
  },
  "paths": {
    "zippedPackage": "solution/react-yammer-api.sppkg"
  }
}