Fix: TypeError in matchConnection for enterprise connections with no domains

[ankita10119]

Changes

Added List() as a default fallback to x.get('domains')

return x.get('domains', List()).contains(target);

This returns an empty Immutable List when domains is absent, making .contains() return false safely instead of throwing.

References

Closes #2733

Testing

Manually ran a unit test (matchConnection.test.js) against the fix to verify the exact regression scenario:

• Mocked core/index.connections to return a samlp enterprise connection with no domains field - replicating what the tenant API returns when no domains are configured on the connection
• Called matchConnection with a valid email and asserted it does not throw

We wrote a test to reproduce the issue. Without the fix applied, the test throws TypeError: Cannot read properties of undefined (reading ‘contains’). With the fix, it passes cleanly.

Checklist

• I have read the Auth0 general contribution guidelines
• I have read the Auth0 Code of Conduct
• All code quality tools/guidelines have been run/followed
• All relevant assets have been compiled

[Copilot]

Pull request overview

Fixes a runtime TypeError in matchConnection when an enterprise connection payload omits the domains field (as can happen when no domains are configured), ensuring the lookup safely returns no match instead of throwing.

Changes:

• Default domains to an empty Immutable List() before calling .contains().
• Add a regression unit test covering the “enterprise connection with no domains” scenario.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/connection/enterprise.js	Prevents .contains() from being called on undefined by providing an empty List() fallback for missing domains.
src/__tests__/connection/enterprise/matchConnection.test.js	Adds a Jest regression test verifying matchConnection does not throw when domains is absent.

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