Support for React 19 RC with Next.js 15

[sundaray]

Hello,

I'm working on a Next.js project and encountering build issues when trying to use @conform-to/react with React 19 RC.

Environment:

• Next.js: 15.0.3
• React: 19.0.0-rc-66855b96-20241106
• React DOM: 19.0.0-rc-66855b96-20241106
• @conform-to/react: ^1.2.2
• @conform-to/zod: ^1.2.2

The issue arises during deployment to Vercel, where I receive dependency resolution errors. The build process indicates that @conform-to/react requires React ">=18", but seems unable to resolve this with the React 19 RC version.

This is the deployment error I am getting:

npm error code ERESOLVE
npm error ERESOLVE could not resolve
npm error
npm error While resolving: @conform-to/react@1.2.2
npm error Found: react@19.0.0-rc-66855b96-20241106
npm error node_modules/react
npm error   react@"19.0.0-rc-66855b96-20241106" from the root project
npm error   peer react@"^16.8 || ^17.0 || ^18.0 || ^19.0 || ^19.0.0-rc" from @radix-ui/react-arrow@1.1.0
npm error   node_modules/@radix-ui/react-arrow
npm error     @radix-ui/react-arrow@"1.1.0" from @radix-ui/react-popper@1.2.0
npm error     node_modules/@radix-ui/react-popper
npm error       @radix-ui/react-popper@"1.2.0" from @radix-ui/react-menu@2.1.2
npm error       node_modules/@radix-ui/react-menu
npm error         @radix-ui/react-menu@"2.1.2" from @radix-ui/react-dropdown-menu@2.1.2
npm error         node_modules/@radix-ui/react-dropdown-menu
npm error   54 more (@radix-ui/react-avatar, @radix-ui/react-collection, ...)
npm error
npm error Could not resolve dependency:
npm error peer react@">=18" from @conform-to/react@1.2.2
npm error node_modules/@conform-to/react

Question:

1. How can I fix the deployment error?

Thanks.