Link to minimal reproducible example

https://github.com/yungyoseo/siwx-test.git

Steps to Reproduce

1. Create a Vite + React + TypeScript project.
2. Install @reown/appkit/react, @reown/appkit-siwx, @reown/appkit-adapter-wagmi, wagmi, @tanstack/react-query.
3. Copy the AppKitProvider code and include siwx: new DefaultSIWX() in createAppKit.
4. Run the dev server and open the project in a browser.
5. UI fails to render; console shows:
   Uncaught TypeError: Cannot read properties of undefined (reading 'slice')
   at readable-stream/_stream_writable.js:57

Summary

Expected Behavior:

• AppKitProvider initializes correctly and app renders normally.

Actual Behavior:

• Adding siwx: new DefaultSIWX() causes AppKitProvider initialization to fail.
• App does not render, console shows:
  Uncaught TypeError: Cannot read properties of undefined (reading 'slice')
  at readable-stream/_stream_writable.js:57
• Removing siwx fixes the issue.

List of related npm package versions

npm list

├── @coinbase/[email protected]
├── @eslint/[email protected]
├── @reown/[email protected]
├── @reown/[email protected]
├── @reown/[email protected]
├── @tanstack/[email protected]
├── @types/[email protected]
├── @types/[email protected]
├── @types/[email protected]
├── @vitejs/[email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
└── [email protected]

Node.js Version

v24.0.0

Package Manager

[email protected]