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feat(clerk-js): Detect locale from browser and send it to FAPI if exists during sign-in (i18n) - #7011
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WalkthroughAdds browser locale detection to the @clerk/clerk-js sign-in flow by calling getBrowserLocale() and conditionally including the locale in sign-in request bodies; if no locale is detected, requests omit the locale. Changes
Sequence Diagram(s)sequenceDiagram
participant User
participant Browser
participant SignIn
participant Server
User->>SignIn: start sign-in (create / password)
SignIn->>Browser: getBrowserLocale()
alt locale detected
Browser-->>SignIn: "en-US" (example)
Note right of SignIn: include `locale` in request body
else locale not detected
Browser-->>SignIn: "" / undefined
Note right of SignIn: omit `locale` from request body
end
SignIn->>Server: POST /sign-in (body with/without locale)
Server-->>SignIn: response
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~20 minutes Poem
Pre-merge checks and finishing touches✅ Passed checks (5 passed)
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@clerk/agent-toolkit@clerk/astro@clerk/backend@clerk/chrome-extension@clerk/clerk-js@clerk/dev-cli@clerk/elements@clerk/clerk-expo@clerk/expo-passkeys@clerk/express@clerk/fastify@clerk/localizations@clerk/nextjs@clerk/nuxt@clerk/clerk-react@clerk/react-router@clerk/remix@clerk/shared@clerk/tanstack-react-start@clerk/testing@clerk/themes@clerk/types@clerk/upgrade@clerk/vuecommit: |
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packages/clerk-js/src/core/resources/__tests__/SignIn.test.ts (1)
packages/clerk-js/src/core/resources/SignIn.ts (1)
SignIn(99-556)
packages/clerk-js/src/core/resources/SignIn.ts (2)
packages/clerk-js/src/core/resources/SignUp.ts (1)
locale(650-652)packages/clerk-js/src/utils/locale.ts (1)
getBrowserLocale(11-28)
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| throw new Error('Unexpected call to BaseResource._fetch'); | ||
| beforeAll(() => { | ||
| const signInCreatedJSON = { |
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with new tests and mocks, this was source of failing tests. So I just added moved the into the beforeAll function so we can have more control over order and scope
| @@ -0,0 +1,5 @@ | |||
| --- | |||
| '@clerk/clerk-js': patch | |||
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since there is no change (even backwards compatible) to the sdk api for users, I think we have a patch here -- open to make it a minor as well
locale from browser and send it to FAPI if exists during sign-inguilherme6191
commented
Oct 16, 2025
Note: I've labeled to |
| return this._basePost({ | ||
| path: this.pathRoot, | ||
| body: params, | ||
| body: { ...params, ...(locale ? { locale } : {}) }, |
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I believe this order should be reversed, as we want to prefer the provided locale from params over the auto-detected one.
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@dstaley, good call. I'm updating the code as it's applicable in case we expose locale as a param as well, which is not the case now.
For now we're not exposing the locale to the sign-in API. We initially think that could add complexity for users and we'll revisit the DX if we expose it. It's available in sign-up as that's more appropriate there. Let me know if that makes sense.
FYI the functionality is going to be behind a FF too.
| '@clerk/clerk-js': patch | ||
| --- | ||
| Add browser locale to sign-in flow |
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| Add browser locale to sign-in flow | |
| Add support for automatically sending the browser locale during the sign-in flow |
locale from browser and send it to FAPI if exists during sign-inlocale from browser and send it to FAPI if exists during sign-in7e714c7 to
f500017CompareThere was a problem hiding this comment.
Actionable comments posted: 0
🧹 Nitpick comments (1)
packages/clerk-js/src/core/resources/__tests__/SignIn.test.ts (1)
63-93: Consider adding cleanup for consistency.The centralized mock setup in
beforeAllis a good refactor. However, for consistency with thesignIn.createsuite and to prevent potential cross-suite pollution, consider adding anafterAllorafterEachto clear mocks after theSignInFuturetests complete.beforeAll(() => { ... }); ++ afterAll(() => {+ vi.clearAllMocks();+ }); it('should select correct first factor by email address', async () => {
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**/*.{js,jsx,ts,tsx}
📄 CodeRabbit inference engine (.cursor/rules/development.mdc)
**/*.{js,jsx,ts,tsx}: All code must pass ESLint checks with the project's configuration
Follow established naming conventions (PascalCase for components, camelCase for variables)
Maintain comprehensive JSDoc comments for public APIs
Use dynamic imports for optional features
All public APIs must be documented with JSDoc
Provide meaningful error messages to developers
Include error recovery suggestions where applicable
Log errors appropriately for debugging
Lazy load components and features when possible
Implement proper caching strategies
Use efficient data structures and algorithms
Profile and optimize critical paths
Validate all inputs and sanitize outputs
Implement proper logging with different levels
Files:
packages/clerk-js/src/core/resources/__tests__/SignIn.test.ts
**/*.{js,jsx,ts,tsx,json,css,scss,md,yaml,yml}
📄 CodeRabbit inference engine (.cursor/rules/development.mdc)
Use Prettier for consistent code formatting
Files:
packages/clerk-js/src/core/resources/__tests__/SignIn.test.ts
packages/**/*.{ts,tsx}
📄 CodeRabbit inference engine (.cursor/rules/development.mdc)
TypeScript is required for all packages
Files:
packages/clerk-js/src/core/resources/__tests__/SignIn.test.ts
packages/**/*.{ts,tsx,d.ts}
📄 CodeRabbit inference engine (.cursor/rules/development.mdc)
Packages should export TypeScript types alongside runtime code
Files:
packages/clerk-js/src/core/resources/__tests__/SignIn.test.ts
**/*.{ts,tsx}
📄 CodeRabbit inference engine (.cursor/rules/development.mdc)
Use proper TypeScript error types
**/*.{ts,tsx}: Always define explicit return types for functions, especially public APIs
Use proper type annotations for variables and parameters where inference isn't clear
Avoidanytype - preferunknownwhen type is uncertain, then narrow with type guards
Useinterfacefor object shapes that might be extended
Usetypefor unions, primitives, and computed types
Preferreadonlyproperties for immutable data structures
Useprivatefor internal implementation details
Useprotectedfor inheritance hierarchies
Usepublicexplicitly for clarity in public APIs
Preferreadonlyfor properties that shouldn't change after construction
Prefer composition and interfaces over deep inheritance chains
Use mixins for shared behavior across unrelated classes
Implement dependency injection for loose coupling
Let TypeScript infer when types are obvious
Useconst assertionsfor literal types:as const
Usesatisfiesoperator for type checking without widening
Use mapped types for transforming object types
Use conditional types for type-level logic
Leverage template literal types for string manipulation
Use ES6 imports/exports consistently
Use default exports sparingly, prefer named exports
Use type-only imports:import type { ... } from ...
Noanytypes without justification
Proper error handling with typed errors
Consistent use ofreadonlyfor immutable data
Proper generic constraints
No unused type parameters
Proper use of utility types instead of manual type construction
Type-only imports where possible
Proper tree-shaking friendly exports
No circular dependencies
Efficient type computations (avoid deep recursion)
Files:
packages/clerk-js/src/core/resources/__tests__/SignIn.test.ts
packages/**/*.{test,spec}.{js,jsx,ts,tsx}
📄 CodeRabbit inference engine (.cursor/rules/monorepo.mdc)
Unit tests should use Jest or Vitest as the test runner.
Files:
packages/clerk-js/src/core/resources/__tests__/SignIn.test.ts
packages/{clerk-js,elements,themes}/**/*.{test,spec}.{js,jsx,ts,tsx}
📄 CodeRabbit inference engine (.cursor/rules/monorepo.mdc)
Visual regression testing should be performed for UI components.
Files:
packages/clerk-js/src/core/resources/__tests__/SignIn.test.ts
**/*.{js,ts,tsx,jsx}
📄 CodeRabbit inference engine (.cursor/rules/monorepo.mdc)
Support multiple Clerk environment variables (CLERK_, NEXT_PUBLIC_CLERK_, etc.) for configuration.
Files:
packages/clerk-js/src/core/resources/__tests__/SignIn.test.ts
**/__tests__/**/*.{ts,tsx}
📄 CodeRabbit inference engine (.cursor/rules/typescript.mdc)
**/__tests__/**/*.{ts,tsx}: Create type-safe test builders/factories
Use branded types for test isolation
Implement proper mock types that match interfaces
Files:
packages/clerk-js/src/core/resources/__tests__/SignIn.test.ts
🧬 Code graph analysis (1)
packages/clerk-js/src/core/resources/__tests__/SignIn.test.ts (1)
packages/clerk-js/src/core/resources/SignIn.ts (1)
SignIn(99-556)
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🔇 Additional comments (1)
packages/clerk-js/src/core/resources/__tests__/SignIn.test.ts (1)
1-1: LGTM! Well-structured test suite for locale behavior.The new test suite properly validates that:
- Locale is included in the request body when
navigator.languageis set (test 1)- Locale is excluded when
navigator.languageis empty (test 2)The cleanup in
afterEachcorrectly addresses the past review concern about stubbed globals persisting across tests.Also applies to: 7-59
locale from browser and send it to FAPI if exists during sign-inlocale from browser and send it to FAPI if exists during sign-in (i18n)Uh oh!
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…xists during sign-in (i18n) (#7011)
Description
This PR adds auto detection of browser
locale(navigator.language) and sends that to sign-in flow. This is similar to the behavior implemented for the sign-up (#6915), but does not exposelocalein the API to reduce noise/complexity at sign-in for now.For extra context: this is a change where we'll be storing users preferred language from the browser, and C1s can update via BAPI (later on via dashboard and AIOs) so we can send localized templates. The whole feature is behind a FF and we're rolling out only for Spark (new customer implementing Clerk).
https://linear.app/clerk/issue/USER-3712/detect-and-send-locale-in-sign-ins-js-lib
Note: needs https://github.com/clerk/clerk_go/pull/14182 released
Checklist
needs https://github.com/clerk/clerk_go/pull/14182 released
pnpm testruns as expected.pnpm buildruns as expected.(If applicable) JSDoc comments have been added or updated for any package exports
(If applicable) Documentation has been updated
Type of change
Summary by CodeRabbit
New Features
Tests