refactor(auth)!: make AuthState a sealed class with per-event payloads - #1846
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Included review availability: Your plan provides up to 4 included reviews per hour; 1 remains after this review. 📝 WalkthroughWalkthroughChangesTyped Auth Events
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Refactor Sequence Diagram(s)sequenceDiagram
participant AuthClient
participant authStateFor
participant AuthState
participant onAuthStateChange
AuthClient->>authStateFor: map AuthChangeEvent
authStateFor->>AuthState: create typed AuthState subtype
AuthClient->>onAuthStateChange: emit state
Merge Risk: ⚪ Minimal · up to Malformed session-required broadcast events are ignored without clearing the local session or emitting a misleading auth event. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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🟡 Changes recommended
A malformed cross-tab event can clear the current session before the event is rejected.
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Pull request overview
Refactors authentication events into a sealed AuthState hierarchy with event-specific payloads.
Changes:
- Adds typed states for all authentication events.
- Updates event construction, tests, documentation, and migration guidance.
- Registers the new public API in SDK compliance metadata.
File summaries
| File | Description |
|---|---|
sdk-compliance.yaml |
Registers new auth-state symbols. |
packages/supabase_flutter/README.md |
Updates listener examples. |
packages/supabase_auth/test/session_persistence_test.dart |
Updates sign-out assertions. |
packages/supabase_auth/test/refresh_token_race_test.dart |
Updates sign-out reason assertions. |
packages/supabase_auth/test/auth_state_test.dart |
Tests the sealed hierarchy. |
packages/supabase_auth/lib/src/types/sign_out_reason.dart |
Updates API references. |
packages/supabase_auth/lib/src/types/auth_state.dart |
Defines event-specific state classes. |
packages/supabase_auth/lib/src/auth_client.dart |
Constructs and emits typed states. |
MIGRATION.md |
Documents the breaking migration. |
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spydon
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September 17, 2026 10:05
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Actionable comments posted: 1
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Inline comments:
In `@packages/supabase_auth/lib/src/auth_client.dart`:
- Line 2107: Update the session-required event handling in
_mayStartBroadcastChannel to call _authStateFor(event, session, fromBroadcast:
true) before clearing or assigning _currentSession. Return immediately when
validation yields null; otherwise assign the validated session and notify
subscribers, preserving the existing session for malformed broadcast events.
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MIGRATION.mdpackages/supabase_auth/lib/src/auth_client.dartpackages/supabase_auth/lib/src/types/auth_state.dartpackages/supabase_auth/lib/src/types/sign_out_reason.dartpackages/supabase_auth/test/auth_state_test.dartpackages/supabase_auth/test/refresh_token_race_test.dartpackages/supabase_auth/test/session_persistence_test.dartpackages/supabase_flutter/README.mdsdk-compliance.yaml
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Each AuthChangeEvent gets its own AuthState subtype: AuthInitialSession, AuthSignedIn, AuthSignedOut, AuthTokenRefreshed, AuthUserUpdated, AuthPasswordRecovery and AuthMfaChallengeVerified. The session is non-nullable on every subtype that guarantees one, AuthSignedOut carries the SignOutReason as `reason`, and a switch over the state is exhaustive. AuthState.event and AuthState.session stay on the base type, so listeners comparing the event keep compiling. AuthState.signOutReason moves to AuthSignedOut.reason and AuthState loses its public constructor. A broadcast event from another tab that carries no session for an event that needs one is dropped with a warning instead of being emitted.
Follow-ups from reviewing the sealed AuthState: - updateUser only emits userUpdated when the session is still present after the request; a sign out that completed during the request has already emitted signedOut, and emitting a session event without a session tripped the new assert in debug builds. - notifyAllSubscribers builds the state before broadcasting, so a session event with no session is neither emitted locally nor posted to other tabs. - _authStateFor is one exhaustive switch over the (event, session) record. - Tests for the dropped event and for fromBroadcast on the new subtypes; the onAuthStateChange dartdoc and README examples use the sealed switch.
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Summary
Stacked on #1845.
AuthStatewas one class for everyAuthChangeEvent, so its payload rules lived in dartdoc:sessionis non-null for every event exceptinitialSessionandsignedOut, andsignOutReasonis only set onsignedOut. Listeners wrotestate.session!and read a field that isnullfor six of the seven events.Resolves SDK-1876.
The hierarchy
AuthStateis sealed with one subtype per event, each carrying exactly the data that event produces:sessionAuthInitialSessionSession?AuthSignedInSessionAuthSignedOutnullSignOutReason? reasonAuthTokenRefreshedSessionAuthUserUpdatedSessionAuthPasswordRecoverySessionAuthMfaChallengeVerifiedSessionWhat stays
AuthChangeEvent, and theevent,sessionandfromBroadcastgetters on the base type. The enum still maps to the wire strings the cross-tab broadcast uses, and keepingstate.event == AuthChangeEvent.signedIncompiling means most apps only have to movesignOutReasontoAuthSignedOut.reason.SupabaseClientand the existing tests keep usingeventunchanged, which is the evidence for that claim.What breaks
AuthState.signOutReasonisAuthSignedOut.reason.AuthStatehas no public constructor; construct the subtype.Client changes
notifyAllSubscribersbuilds the state through a private_authStateForswitch over the event. Every local emit already saves the session first (checked each call site,updateUserthrowsAuthSessionMissingExceptionbefore it gets there), so the only way to reach a session-carrying event without a session is a malformed cross-tab broadcast. That case is now dropped with a warning instead of emitted, where it used to surface as asignedInwithsession: null.Tests and docs
auth_state_test.dartagainstMockSupabaseHttpClient: initial, sign in, refresh, user update, sign out and late-subscriber cases assert the subtype, its payload andevent, and an exhaustiveswitchexpression over the hierarchy fails to compile if a subtype is added without handling.signOutReasonassertions useisA<AuthSignedOut>().having(...).MIGRATION.mdsection with before and after, theAuthStatedartdoc carries the same example, and thesupabase_flutterREADME listen snippet shows the switch.auth.session.subscribe_auth_eventsinsdk-compliance.yaml, andauth.session.sign_out_reasonpoints atAuthSignedOut.reason. Symbol, drift and schema checks pass locally against the pinnedcapability-matrix-v1.9.0.Full
supabase_authsuite (578 with the new file),supabase,supabase_flutterandsupabase_testpass.dart analyzeand DCM are clean at warning level.Summary by CodeRabbit
AuthSignedOut.reason.