feat(expo): add biometric reverification by seanperez29 · Pull Request #9829 · clerk/javascript

seanperez29 · 2026-09-18T19:04:35Z

Description

Adds useBiometricCredentials().reverify() for first-, second-, and multi-factor verification of active sessions on iOS and Android. When first-factor verification requires a second factor, the native bridge continues the same attempt automatically. The result includes the verification status and synchronized JavaScript session. Completed verification clears cached session tokens and fetches a fresh token without creating another session.

New biometric enrollments default to biometry_current_set, requiring biometrics without device-passcode fallback and invalidating the key when the enrolled biometric set changes. Existing credentials retain their original policies. Biometric reverification on both iOS and Android requires biometry_current_set; incompatible credentials return biometric_credential_policy_incompatible so apps can offer another verification method.

Documentation updates are prepared in clerk/clerk#3438 for publication alongside this Expo release.

Checklist

pnpm test runs as expected.
pnpm build runs as expected.
(If applicable) JSDoc comments have been added or updated for any package exports
(If applicable) Documentation has been updated

Type of change

changeset-bot · 2026-09-18T19:04:41Z

🦋 Changeset detected

Latest commit: 7f24730

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@clerk/expo	Minor

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Click here if you're a maintainer who wants to add another changeset to this PR

vercel · 2026-09-18T19:04:41Z

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coderabbitai · 2026-09-18T19:04:42Z

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📝 Walkthrough

Walkthrough

The change adds reverify() to Expo biometric credentials. It defines public and native result types, validates active sessions, synchronizes session state, and refreshes tokens after completed verification. The iOS and Android bridges perform session verification and map statuses and errors. The default enrollment policy changes to biometry_current_set. Tests cover session changes, synchronization, errors, factor handling, older native builds, and unsupported platforms. The changeset describes the new flow, and the Expo README biometric sign-in documentation is removed.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Merge Risk: 🔵 Low · up to ce622

New biometric enrollments behave differently from the published Expo guidance. Coordinate the documentation update for release; this mismatch does not otherwise block merging.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 38 functions across 12 files. (1 skipped: …	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The description clearly explains the biometric reverification feature, policy changes, platform behavior, errors, tests, and documentation updates.
Title check	✅ Passed	The title accurately and concisely identifies the main change: adding biometric reverification to the Expo package.

Full details: Docstring Coverage

Explanation

Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 38 functions across 12 files. (1 skipped: 1 unsupported.)

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pkg-pr-new · 2026-09-18T19:31:15Z

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commit: 7f24730

github-actions · 2026-09-21T17:27:18Z

API Changes Report

Generated by Break Check on 2026-09-24T15:07:59.316Z

Summary

Metric	Count
Packages analyzed	19
Packages with changes	2
🔴 Breaking changes	0
🟡 Non-breaking changes	3
🟢 Additions	2

🤖 This report was reviewed by claude-sonnet-4-6.

@clerk/expo

Current version: 4.6.9
Recommended bump: MINOR → 4.7.0

🟡 Non-breaking Changes (2)

Modified: `BiometricCredentialErrorCode`

- export type BiometricCredentialErrorCode = 'environment_unavailable' | 'unsupported_platform' | 'biometric_authentication_unavailable' | 'biometric_authentication_canceled' | 'biometric_authentication_failed' | 'key_generation_failed' | 'key_not_found' | 'key_invalidated' | 'invalid_public_key' | 'public_key_export_failed' | 'unsupported_algorithm' | 'signing_failed' | 'key_deletion_failed' | 'invalid_trusted_device_policy' | 'E_TRUSTED_DEVICE_AVAILABILITY_FAILED' | 'E_TRUSTED_DEVICE_LIST_FAILED' | 'E_TRUSTED_DEVICE_ENROLLMENT_FAILED' | 'E_TRUSTED_DEVICE_REVOCATION_FAILED' | 'E_TRUSTED_DEVICE_SIGN_IN_FAILED' | (string & {});
+ export type BiometricCredentialErrorCode = 'environment_unavailable' | 'unsupported_platform' | 'biometric_authentication_unavailable' | 'biometric_authentication_canceled' | 'biometric_authentication_failed' | 'key_generation_failed' | 'key_not_found' | 'key_invalidated' | 'invalid_public_key' | 'public_key_export_failed' | 'unsupported_algorithm' | 'signing_failed' | 'key_deletion_failed' | 'invalid_trusted_device_policy' | 'biometric_credential_policy_incompatible' | 'invalid_reverification_level' | 'biometric_reverification_session_unavailable' | 'E_BIOMETRIC_REVERIFICATION_FAILED' | 'E_TRUSTED_DEVICE_AVAILABILITY_FAILED' | 'E_TRUSTED_DEVICE_LIST_FAILED' | 'E_TRUSTED_DEVICE_ENROLLMENT_FAILED' | 'E_TRUSTED_DEVICE_REVOCATION_FAILED' | 'E_TRUSTED_DEVICE_SIGN_IN_FAILED' | (string & {});

Static analyzer: Breaking change in type alias BiometricCredentialErrorCode: Type changed: 'E_TRUSTED_DEVICE_AVAILABILITY_FAILED'|'E_TRUSTED_DEVICE_ENROLLMENT_FAILED'|'E_TRUSTED_DEVICE_LIST_FAILED'|'E_TRUSTED_D… → 'E_BIOMETRIC_REVERIFICATION_FAILED'|'E_TRUSTED_DEVICE_AVAILABILITY_FAILED'|'E_TRUSTED_DEVICE_ENROLLMENT_FAILED'|'E_TRUS…

🔤 Suggestion-only union change: the union keeps its string&{} arm, which absorbs every string; the changed arms (removed: none; added: 'biometric_credential_policy_incompatible', 'invalid_reverification_level', 'biometric_reverification_session_unavailable', 'E_BIOMETRIC_REVERIFICATION_FAILED') only affect editor autocomplete, so no well-typed consumer is affected. Set downgradeAbsorbingArmUnions: false to keep these breaking.

🤖 AI review (confirmed) (99%): The union contains string & {} which absorbs all string values; adding new literal arms alongside that absorbing arm does not change the assignable set in either input or output position (rule 14, absorbingArmUnion confirmed).

Modified: `UseBiometricCredentialsReturn`

// ... 3 unchanged lines elided ...
      enroll: (params?: EnrollBiometricCredentialParams) => Promise<BiometricCredential>;
      revoke: (id: string) => Promise<BiometricCredential>;
      signIn: (params?: SignInWithBiometricsParams) => Promise<BiometricSignInResult>;
+     reverify: (params?: ReverifyWithBiometricsParams) => Promise<BiometricReverificationResult>;
  };

Static analyzer: Breaking change in type alias UseBiometricCredentialsReturn: Type changed: {getAvailability:(params?:import("@clerk/expo").GetBiometricCredentialAvailabilityParams)=>!Promise:interface<import("@… → {getAvailability:(params?:import("@clerk/expo").GetBiometricCredentialAvailabilityParams)=>!Promise:interface<import("@…

🤖 AI review (reclassified as non-breaking) (95%): UseBiometricCredentialsReturn is a return/output type (from useBiometricCredentials()), and the change only adds a new optional-like property reverify to an object type that consumers only read—existing consumers never constructed this type, so adding a new property is non-breaking; it is strictly an addition to the surface.

🟢 Additions (2)

Added: `BiometricReverificationResult`

+ export type BiometricReverificationResult = {
+     id: string | null;
+     status: SessionVerificationStatus | (string & {});
+     level: SessionVerificationLevel | (string & {});
+     session: SessionResource;
+ };

Added type alias BiometricReverificationResult

Added: `ReverifyWithBiometricsParams`

+ export type ReverifyWithBiometricsParams = {
+     level?: SessionVerificationLevel;
+     reason?: string;
+ };

Added type alias ReverifyWithBiometricsParams

@clerk/ui

Current version: 1.34.0
Recommended bump: MINOR → 1.35.0

Subpath `./themes/experimental`

🟡 Non-breaking Changes (1)

Modified: `createTheme`

// ... 4 unchanged lines elided ...
      theme: InternalTheme;
    }) => Elements);
    theme?: (BaseTheme | BaseTheme[]) | undefined;
-   options?: import("@clerk/ui/internal").Options | undefined;
-   variables?: import("@clerk/ui/internal").Variables | undefined;
-   captcha?: import("@clerk/ui/internal").CaptchaAppearanceOptions | undefined;
+   options?: Options | undefined;
+   variables?: Variables | undefined;
+   captcha?: CaptchaAppearanceOptions | undefined;
    cssLayerName?: string | undefined;
  }

Static analyzer: Breaking change in function createTheme: Return type changed: {__type:"prebuilt_appearance";name?:string;elements?:!unknown|((params:{theme:import("@clerk/ui").~InternalTheme;})=>!unknown);theme?:(!unknown|!unknown[])|undefined;options?:import("@clerk/ui/internal").Options|undefined;variables?:import("@clerk/ui/internal").Variables|undefined;captcha?:import("@clerk/ui/internal").CaptchaAppearanceOptions|undefined;cssLayerName?:string|undefined;} → {__type:"prebuilt_appearance";name?:string;elements?:((params:{theme:import("@clerk/ui").~InternalTheme;})=>import("@clerk/ui").~Elements)|import("@clerk/ui").~Elements;theme?:(import("@clerk/ui").~BaseTheme|import("@clerk/ui").~BaseTheme[])|undefined;options?:import("@clerk/ui").~Options|undefined;variables?:import("@clerk/ui").~Variables|undefined;captcha?:import("@clerk/ui").~CaptchaAppearanceOptions|undefined;cssLayerName?:string|undefined;}

🤖 AI review (reclassified as non-breaking) (85%): The before/after snippets show the return type's structural shape is identical — the only difference is that options, variables, and captcha fields previously referenced @clerk/ui/internal (verdict: unknown/package not found, so the old specifier's resolvability is unverified) and now reference @clerk/ui directly. Since both the old and new imports resolve to the same named types (Options, Variables, CaptchaAppearanceOptions) and the function signature and return shape are otherwise unchanged, this is a repair/re-export consolidation with no observable structural difference for consumers who could already resolve the types; consumers who could not resolve @clerk/ui/internal are actually better off.

Report generated by Break Check

_{Last ran on 7f24730.}

wobsoriano

AI-assisted findings, checked against the pinned native SDKs:

Multi-factor reverification

Both native bridges return after a single verifyWithBiometrics call. If the first factor returns needs_second_factor, reverify() returns an incomplete result with no way to continue that attempt. Calling it again starts a new verification. Can the bridge run the second factor when the first result requires it?

iOS passcode fallback

On iOS, reverification can select an older credential enrolled with biometry_or_device_passcode. clerk-ios 1.5.5 does not reject that policy, so the device passcode can complete reverification. Android requires biometry_current_set. Can iOS enforce the same requirement? This may need a clerk-ios change because the local policy is internal to that SDK.

Manual review otherwise looks good 👍

seanperez29 · 2026-09-23T14:28:19Z

AI-assisted findings, checked against the pinned native SDKs:

Multi-factor reverification

Both native bridges return after a single verifyWithBiometrics call. If the first factor returns needs_second_factor, reverify() returns an incomplete result with no way to continue that attempt. Calling it again starts a new verification. Can the bridge run the second factor when the first result requires it?

iOS passcode fallback

On iOS, reverification can select an older credential enrolled with biometry_or_device_passcode. clerk-ios 1.5.5 does not reject that policy, so the device passcode can complete reverification. Android requires biometry_current_set. Can iOS enforce the same requirement? This may need a clerk-ios change because the local policy is internal to that SDK.

Manual review otherwise looks good 👍

Sounds good! Will get another version of iOS out with this adjustment. Working on that now.

coderabbitai

Actionable comments posted: 1

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Inline comments:
In @.changeset/biometric-session-reverification.md:
- Line 7: Coordinate the Expo documentation updates in the separate clerk-docs
release flow: update the use-biometric-credentials hook reference and
biometric-credentials policy partial to document biometry_current_set as the
default, with device-passcode fallback described as opt-in via
biometry_or_device_passcode.

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seanperez29 · 2026-09-23T19:02:25Z

@wobsoriano CI keeps failing due to API rate limits and time outs because of some shared CI cleanup process. I'll keep periodically trying and let you know when they succeed.

Add useBiometricCredentials().reverify() for active sessions on iOS and Android, supporting first-, second-, and multi-factor verification with session synchronization and token refresh. Default new biometric enrollments to biometry_current_set while preserving existing credential policies. Support local native SDK overrides and add reverification tests and documentation.

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seanperez29 force-pushed the sean/Biometric-reverification branch from ce62208 to cab6678 Compare September 23, 2026 17:26

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seanperez29 added 4 commits September 24, 2026 11:00

docs(expo): remove biometric section from package README

6f9368b

fix(expo): continue biometric reverification across factors

75cef84

fix(expo): use released iOS biometric policy enforcement

7f24730

seanperez29 force-pushed the sean/Biometric-reverification branch from ce60b03 to 7f24730 Compare September 24, 2026 15:01

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clerk-cookie mentioned this pull request Sep 24, 2026

ci(repo): Version packages #9893

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feat(expo): add biometric reverification - #9829

feat(expo): add biometric reverification#9829
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API Changes Report

Summary

@clerk/expo

🟡 Non-breaking Changes (2)

Modified: BiometricCredentialErrorCode

Modified: UseBiometricCredentialsReturn

🟢 Additions (2)

Added: BiometricReverificationResult

Added: ReverifyWithBiometricsParams

@clerk/ui

Subpath ./themes/experimental

🟡 Non-breaking Changes (1)

Modified: createTheme

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Modified: `BiometricCredentialErrorCode`

Modified: `UseBiometricCredentialsReturn`

Added: `BiometricReverificationResult`

Added: `ReverifyWithBiometricsParams`

Subpath `./themes/experimental`

Modified: `createTheme`