Different versions of react and react-router mounting on different DOM nodes, along with properly long-term cached production code
yarn
npm run dev
npm run build
npm run clean
"postinstall": "find ./packages/* -name package.json -maxdepth 2 -execdir yarn \\;",
"clean": "find . -name package.json -maxdepth 3 -execdir rm -fr node_modules npm-debug.log yarn.lock \\;",