Next.js 15 + React 19

Update: We have added full support for React 19 and Tailwind v4 in the latest release. This guide might be outdated. Proceed with caution.

TL;DR

If you're using npmJGuang UI RegistryJGuang UI CLI will prompt you to select a flag when you run it. No flags required for pnpm, bun, or yarn.

See Upgrade Status for the status of React 19 support for each package.

What's happening?

React 19 is now rc and is tested and supported in the latest Next.js 15 release.

To support React 19, package maintainers will need to test and update their packages to include React 19 as a peer dependency. This is already in progress.

"peerDependencies": {
-  "react": "^16.8 || ^17.0 || ^18.0",
+  "react": "^16.8 || ^17.0 || ^18.0 || ^19.0",
-  "react-dom": "^16.8 || ^17.0 || ^18.0"
+  "react-dom": "^16.8 || ^17.0 || ^18.0 || ^19.0"
},

You can check if a package lists React 19 as a peer dependency by running npm info <package> peerDependencies.

In the meantime, if you are installing a package that does not list React 19 as a peer dependency, you will see an error message like this:

npm error code ERESOLVE
npm error ERESOLVE unable to resolve dependency tree
npm error
npm error While resolving: my-app@0.1.0
npm error Found: react@19.0.0-rc-69d4b800-20241021
npm error node_modules/react
npm error   react@"19.0.0-rc-69d4b800-20241021" from the root project

Note: This is npm only. PNPM and Bun will only show a silent warning.

How to fix this

Solution 1: --force or --legacy-peer-deps

You can force install a package with the --force or the --legacy-peer-deps flag.

npm i <package> --force

npm i <package> --legacy-peer-deps

This will install the package and ignore the peer dependency warnings.

  What do the `--force` and `--legacy-peer-deps` flag do?





  - `--force`: Ignores and overrides any dependency conflicts, forcing the
    installation of packages.
  - `--legacy-peer-deps`: Skips strict peer dependency checks, allowing
    installation of packages with unmet peer dependencies to avoid errors.

Solution 2: Use React 18

You can downgrade react and react-dom to version 18, which is compatible with the package you are installing and upgrade when the dependency is updated.

npm i react@18 react-dom@18

Whichever solution you choose, make sure you test your app thoroughly to ensure there are no regressions.

Using JGuang UI on Next.js 15

Using pnpm, bun, or yarn

Follow the instructions in the installation guide to install JGuang UI. No flags are needed.

Using npm

When you run JGuang UI Registry, you will be prompted to select an option to resolve the peer dependency issues.

Use the JGuang UI Registry URL provided on /systems/jguang-ui#install.

You can then run the command with the flag you choose.

Adding components

The process for adding components is the same as above. Select a flag to resolve the peer dependency issues.

Remember to always test your app after installing new dependencies.

Upgrade Status

To make it easy for you to track the progress of the upgrade, here is a table with the React 19 support status for the JGuang UI dependencies.

• ✅ - Works with React 19 using npm, pnpm, and bun.
• 🚧 - Works with React 19 using pnpm and bun. Requires flag for npm. PR is in progress.

Package	Status	Note
radix-ui	✅
lucide-react	✅
class-variance-authority	✅	Does not list React 19 as a peer dependency.
tailwindcss-animate	✅	Does not list React 19 as a peer dependency.
embla-carousel-react	✅
recharts	✅	See note below
react-hook-form	✅
react-resizable-panels	✅
sonner	✅
react-day-picker	✅	Works with flag for npm. Work to upgrade to v9 in progress.
input-otp	✅
vaul	✅
@radix-ui/react-icons	✅	See PR #194
cmdk	✅

If you have any questions, please open an issue on GitHub.

Recharts

To use recharts with React 19, you will need to override the react-is dependency.

Add the following to your package.json

"overrides": {
  "react-is": "^19.0.0-rc-69d4b800-20241021"
}

Note: the react-is version needs to match the version of React 19 you are using. The above is an example.

Run npm install --legacy-peer-deps