Next.js 15 + React 19

TL;DR

If you're using npm, you can install nyxb/ui dependencies with a flag. The nyxb 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"
},

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

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.

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 nyxb/ui on Next.js 15

Using pnpm, bun, or yarn

Follow the instructions in the installation guide to install nyxb/ui. No flags are needed.

Using npm

When you run npx nyxb@latest init -d, you will be prompted to select an option to resolve the peer dependency issues.

It looks like you are using React 19.
Some packages may fail to install due to peer dependency issues (see https://nyxbui.design/react-19).
 
? How would you like to proceed? › - Use arrow-keys. Return to submit.
❯   Use --force
    Use --legacy-peer-deps

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 track the progress of the upgrade, I've created a table below with React 19 support status for the nyxb/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.

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.

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