[RAC] React 19 peer dependency issue with @react-aria/collections

[adriantrunzo]

Provide a general summary of the issue here

While upgrading a project with react-aria-components@1.50 to React 19, I received the following warning from pnpm:

 WARN  Issues with peer dependencies found
.
└─┬ react-aria-components 1.5.0
  └─┬ @react-aria/collections 3.0.0-alpha.6
    └─┬ use-sync-external-store 1.2.2
      └── ✕ unmet peer react@"^16.8.0 || ^17.0.0 || ^18.0.0": found 19.0.0

🤔 Expected Behavior?

No peer dependency warnings with React 19, since react-aria-components accepts v19 in its peer dependency list.

😯 Current Behavior

Peer dependency warning when using React 19 with react-aria-components.

💁 Possible Solution

Updating the use-sync-external-store version to 1.4.0 in

react-spectrum/packages/@react-aria/collections/package.json

Line 29 in e7053dd

"use-sync-external-store": "^1.2.0"

will resolve the issue. I don't notice any breaking changes in the history for that package: https://github.com/facebook/react/commits/main/packages/use-sync-external-store.

🔦 Context

No response

🖥️ Steps to Reproduce

1. Create a new project with pnpm, React 19, and React Aria Components 1.5.0
2. Run pnpm install

Version

react-aria-components 1.5.0

What browsers are you seeing the problem on?

Other

If other, please specify.

Package manager

What operating system are you using?

macOS 15.1.1

🧢 Your Company/Team

No response

🕷 Tracking Issue

No response

[LFDanLu]

Thanks for filing this, I've added it to our internal React 19 epic!

[wojtekmaj]

This should be as easy as bumping dependency to ^1.4.0 as use-sync-external-store@npm:1.4.0 has React 19 in its peerDependencies.