I opened package.json I can see: "react": "^16.4.1", "react-dom": "^16.4.1", "react-emotion": "^9.2.4", "react-hot-loader": "^3.1.3", "reac

I opened package.json I can see: "react": "^16.4.1", "react-dom": "^16.4.1", "react-emotion": "^9.2.4", "react-hot-loader": "^3.1.3", "react-portal": "^4.1.5", "react-router-dom": "^4.3.1", "react-values": "^0.3.0", Looks like it requires react+vdom to me to be functional, Core has a peer dependency on react too.