signInWithPassword broken in 2.71.0 on React Native (ReferenceError: Property 'structuredClone' doesn't exist)

[samzmann]

Bug report

• I confirm this is a bug with Supabase, not with my own application.
• I confirm I have searched the Docs, GitHub Discussions, and Discord.

Describe the bug

In React Native, calling supabase.auth.signInWithPassword throws an unhandled error ReferenceError: Property 'structuredClone' doesn't exist:

 try {
    const { data, error } = await supabase.auth.signInWithPassword({ email, password })
    console.log('signInWithPassword data', data)
    console.log('signInWithPassword error', error)
  } catch (error) {
    console.log('error', error) // ReferenceError: Property 'structuredClone' doesn't exist
  }

Reverting to @supabase/supabase-js 2.50.3 which depends on @supabase/auth-js 2.70.0 solves the issue.

I also tried installing the @ungap/structured-clone polyfill, but that did not work.

To Reproduce

1. Setup a basic RN Expo project
2. Install @supabase/supabase-js 2.51.0
3. basic Supabase client setup
4. call supabase.auth.signInWithPassword wrapping it in a try/catch
5. get the error

Expected behavior

• if success: return session data (login)
• if error: return error param

After experiencing this issue, I was surprised to see that signInWithPassword throws if it encounters an unexpected error. This makes the error filed on the response kind of misleading, although I can understand the rational.

System information

• OS: macOS
• react-native: 0.79.5
• expo: ~53.0.17
• Version of supabase-js: 2.51.0
• Version of Node.js: 24.3.0

Additional context

Add any other context about the problem here.

[samzmann]

The error must come from GoTrueClient.ts, where a few calls to structuredClone were added
supabase/auth-js@v2.70.0...v2.71.0#diff-3522461172efd6058d6b8da62fc2d30d8b524d2b64894ea2c67218c52f7fdff5

@hf @cemalkilic Any insights?