Koichi Kobayashi

I think that the cause of that warning is that the `value` of the control is passed `undefined`, so can you try pass empty string? ```jsx get: (field) => ({get})...

The example on Next.js is here. https://github.com/recruit-tech/recoil-sync-next ## Install ```bash git clone https://github.com/recruit-tech/recoil-sync-next cd examples/url-sync-json/ yarn yarn dev ``` # location={{ part: 'queryParams' }} (no problem) `examples/url-sync-json/pages/_app.tsx`: open http://localhost:3000/ ...

Ready to merge