feat(clerk-js): Pass locale to Stripe elements

.changeset/cold-bottles-watch.md

@@ -0,0 +1,6 @@
+---
+'@clerk/clerk-js': patch
+'@clerk/shared': patch
+---
+
+Pass current localization value to Stripe Elements

packages/clerk-js/sandbox/app.ts

@@ -237,19 +237,20 @@ function otherOptions() {
   });
 
   const updateOtherOptions = () => {
-    void Clerk.__unstable__updateProps({
-      options: Object.fromEntries(
-        Object.entries(otherOptionsInputs).map(([key, input]) => {
-          sessionStorage.setItem(key, input.value);
+    const options = Object.fromEntries(
+      Object.entries(otherOptionsInputs).map(([key, input]) => {
+        sessionStorage.setItem(key, input.value);
 
-          if (key === 'localization') {
-            return [key, l[input.value as keyof typeof l]];
-          }
+        if (key === 'localization') {
+          const localizationObj = l[input.value as keyof typeof l];
+          return [key, localizationObj];
+        }
 
-          return [key, input.value];
-        }),
-      ),
-    });
+        return [key, input.value];
+      }),
+    );
+
+    void Clerk.__unstable__updateProps({ options });
   };
 
   Object.values(otherOptionsInputs).forEach(input => {

packages/clerk-js/src/core/clerk.ts

@@ -2375,10 +2375,16 @@ export class Clerk implements ClerkInterface {
     // 2. clerk-js initializes propA with a default value
     // 3. The customer update propB independently of propA and window.Clerk.updateProps is called
     // 4. If we don't merge the new props with the current options, propA will be reset to undefined
+    const mergedOptions = { ...this.#options, ..._props.options };
+
+    // Update the Clerk instance's internal options
+    this.#options = mergedOptions;
+
     const props = {
       ..._props,
-      options: this.#initOptions({ ...this.#options, ..._props.options }),
+      options: this.#initOptions(mergedOptions),
     };
+
     return this.#componentControls?.ensureMounted().then(controls => controls.updateProps(props));
   };
 

packages/shared/src/react/__tests__/commerce.test.tsx

@@ -0,0 +1,321 @@
+import { render, screen } from '@testing-library/react';
+import '@testing-library/jest-dom';
+import React from 'react';
+
+import { OptionsContext } from '../contexts';
+import { __experimental_PaymentElementProvider, __experimental_PaymentElement } from '../commerce';
+
+// Mock the Stripe components
+jest.mock('../stripe-react', () => ({
+  Elements: ({ children, options }: { children: React.ReactNode; options: any }) => (
+    <div
+      data-testid='stripe-elements'
+      data-locale={options.locale}
+    >
+      {children}
+    </div>
+  ),
+  PaymentElement: ({ fallback }: { fallback?: React.ReactNode }) => (
+    <div data-testid='stripe-payment-element'>{fallback}</div>
+  ),
+  useElements: () => null,
+  useStripe: () => null,
+}));
+
+// Mock the hooks
+const mockGetOption = jest.fn();
+jest.mock('../hooks/useClerk', () => ({
+  useClerk: () => ({
+    __internal_loadStripeJs: jest.fn().mockResolvedValue(() => Promise.resolve({})),
+    __internal_getOption: mockGetOption,
+    __unstable__environment: {
+      commerceSettings: {
+        billing: {
+          stripePublishableKey: 'pk_test_123',
+        },
+      },
+      displayConfig: {
+        userProfileUrl: 'https://example.com/profile',
+        organizationProfileUrl: 'https://example.com/org-profile',
+      },
+    },
+  }),
+}));
+
+jest.mock('../hooks/useUser', () => ({
+  useUser: () => ({
+    user: {
+      id: 'user_123',
+      initializePaymentSource: jest.fn().mockResolvedValue({
+        externalGatewayId: 'acct_123',
+        externalClientSecret: 'seti_123',
+        paymentMethodOrder: ['card'],
+      }),
+    },
+  }),
+}));
+
+jest.mock('../hooks/useOrganization', () => ({
+  useOrganization: () => ({
+    organization: null,
+  }),
+}));
+
+jest.mock('swr', () => ({
+  __esModule: true,
+  default: () => ({ data: { loadStripe: jest.fn().mockResolvedValue({}) } }),
+}));
+
+jest.mock('swr/mutation', () => ({
+  __esModule: true,
+  default: () => ({
+    data: {
+      externalGatewayId: 'acct_123',
+      externalClientSecret: 'seti_123',
+      paymentMethodOrder: ['card'],
+    },
+    trigger: jest.fn().mockResolvedValue({
+      externalGatewayId: 'acct_123',
+      externalClientSecret: 'seti_123',
+      paymentMethodOrder: ['card'],
+    }),
+  }),
+}));
+
+describe('PaymentElement Localization', () => {
+  const mockCheckout = {
+    id: 'checkout_123',
+    plan: {
+      id: 'plan_123',
+      name: 'Test Plan',
+      description: 'Test plan description',
+      fee: { amount: 1000, amountFormatted: '$10.00', currency: 'usd', currencySymbol: '$' },
+      annualFee: { amount: 10000, amountFormatted: '$100.00', currency: 'usd', currencySymbol: '$' },
+      annualMonthlyFee: { amount: 833, amountFormatted: '$8.33', currency: 'usd', currencySymbol: '$' },
+      currency: 'usd',
+      interval: 'month' as const,
+      intervalCount: 1,
+      maxAllowedInstances: 1,
+      trialDays: 0,
+      isAddon: false,
+      isPopular: false,
+      isPerSeat: false,
+      isUsageBased: false,
+      isFree: false,
+      isLegacy: false,
+      isDefault: false,
+      isRecurring: true,
+      hasBaseFee: true,
+      forPayerType: 'user' as const,
+      publiclyVisible: true,
+      slug: 'test-plan',
+      avatarUrl: '',
+      freeTrialDays: 0,
+      freeTrialEnabled: false,
+      pathRoot: '/',
+      reload: jest.fn(),
+      features: [],
+      limits: {},
+      metadata: {},
+    },
+    totals: {
+      subtotal: { amount: 1000, amountFormatted: '$10.00', currency: 'usd', currencySymbol: '$' },
+      grandTotal: { amount: 1000, amountFormatted: '$10.00', currency: 'usd', currencySymbol: '$' },
+      taxTotal: { amount: 0, amountFormatted: '$0.00', currency: 'usd', currencySymbol: '$' },
+      totalDueNow: { amount: 1000, amountFormatted: '$10.00', currency: 'usd', currencySymbol: '$' },
+      credit: { amount: 0, amountFormatted: '$0.00', currency: 'usd', currencySymbol: '$' },
+      pastDue: { amount: 0, amountFormatted: '$0.00', currency: 'usd', currencySymbol: '$' },
+    },
+    status: 'needs_confirmation' as const,
+    error: null,
+    fetchStatus: 'idle' as const,
+    confirm: jest.fn(),
+    start: jest.fn(),
+    clear: jest.fn(),
+    finalize: jest.fn(),
+    getState: jest.fn(),
+    isConfirming: false,
+    isStarting: false,
+    planPeriod: 'month' as const,
+    externalClientSecret: 'seti_123',
+    externalGatewayId: 'acct_123',
+    isImmediatePlanChange: false,
+    paymentMethodOrder: ['card'],
+    freeTrialEndsAt: null,
+    payer: {
+      id: 'payer_123',
+      createdAt: new Date('2023-01-01'),
+      updatedAt: new Date('2023-01-01'),
+      imageUrl: null,
+      userId: 'user_123',
+      email: '[email protected]',
+      firstName: 'Test',
+      lastName: 'User',
+      organizationId: undefined,
+      organizationName: undefined,
+      pathRoot: '/',
+      reload: jest.fn(),
+    },
+  };
+
+  const renderWithLocale = (locale: string) => {
+    // Mock the __internal_getOption to return the expected localization
+    mockGetOption.mockImplementation(key => {
+      if (key === 'localization') {
+        return { locale };
+      }
+      return undefined;
+    });
+
+    const options = {
+      localization: { locale },
+    };
+
+    return render(
+      <OptionsContext.Provider value={options}>
+        <__experimental_PaymentElementProvider checkout={mockCheckout}>
+          <__experimental_PaymentElement fallback={<div>Loading...</div>} />
+        </__experimental_PaymentElementProvider>
+      </OptionsContext.Provider>,
+    );
+  };
+
+  it('should pass the correct locale to Stripe Elements', () => {
+    renderWithLocale('es');
+
+    const elements = screen.getByTestId('stripe-elements');
+    expect(elements).toHaveAttribute('data-locale', 'es');
+  });
+
+  it('should default to "en" when no locale is provided', () => {
+    // Mock the __internal_getOption to return undefined for localization
+    mockGetOption.mockImplementation(key => {
+      if (key === 'localization') {
+        return undefined;
+      }
+      return undefined;
+    });
+
+    const options = {};
+
+    render(
+      <OptionsContext.Provider value={options}>
+        <__experimental_PaymentElementProvider checkout={mockCheckout}>
+          <__experimental_PaymentElement fallback={<div>Loading...</div>} />
+        </__experimental_PaymentElementProvider>
+      </OptionsContext.Provider>,
+    );
+
+    const elements = screen.getByTestId('stripe-elements');
+    expect(elements).toHaveAttribute('data-locale', 'en');
+  });
+
+  it('should handle different locale values', () => {
+    const locales = ['en', 'es', 'fr', 'de', 'it'];
+
+    locales.forEach(locale => {
+      const { unmount } = renderWithLocale(locale);
+
+      const elements = screen.getByTestId('stripe-elements');
+      expect(elements).toHaveAttribute('data-locale', locale);
+
+      unmount();
+    });
+  });
+
+  it('should handle undefined localization object', () => {
+    // Mock the __internal_getOption to return undefined for localization
+    mockGetOption.mockImplementation(key => {
+      if (key === 'localization') {
+        return undefined;
+      }
+      return undefined;
+    });
+
+    const options = {
+      localization: undefined,
+    };
+
+    render(
+      <OptionsContext.Provider value={options}>
+        <__experimental_PaymentElementProvider checkout={mockCheckout}>
+          <__experimental_PaymentElement fallback={<div>Loading...</div>} />
+        </__experimental_PaymentElementProvider>
+      </OptionsContext.Provider>,
+    );
+
+    const elements = screen.getByTestId('stripe-elements');
+    expect(elements).toHaveAttribute('data-locale', 'en');
+  });
+
+  it('should work with full LocalizationResource structure like ClerkProvider', () => {
+    // Mock the __internal_getOption to return the expected localization
+    mockGetOption.mockImplementation(key => {
+      if (key === 'localization') {
+        return { locale: 'fr-FR' };
+      }
+      return undefined;
+    });
+
+    // This test simulates the actual ClerkProvider usage pattern:
+    // import { frFR } from '@clerk/localizations';
+    // <ClerkProvider localization={frFR}>
+    const options = {
+      localization: {
+        locale: 'fr-FR',
+        // This would normally contain all the translation strings from frFR
+        // but we only need the locale property for our implementation
+      },
+    };
+
+    render(
+      <OptionsContext.Provider value={options}>
+        <__experimental_PaymentElementProvider checkout={mockCheckout}>
+          <__experimental_PaymentElement fallback={<div>Loading...</div>} />
+        </__experimental_PaymentElementProvider>
+      </OptionsContext.Provider>,
+    );
+
+    const elements = screen.getByTestId('stripe-elements');
+    // Should normalize 'fr-FR' to 'fr' for Stripe compatibility
+    expect(elements).toHaveAttribute('data-locale', 'fr');
+  });
+
+  it('should normalize full locale strings to 2-letter codes for Stripe', () => {
+    const testCases = [
+      { input: 'en-US', expected: 'en' },
+      { input: 'fr-FR', expected: 'fr' },
+      { input: 'es-ES', expected: 'es' },
+      { input: 'de-DE', expected: 'de' },
+      { input: 'it-IT', expected: 'it' },
+      { input: 'pt-BR', expected: 'pt' },
+    ];
+
+    testCases.forEach(({ input, expected }) => {
+      // Mock the __internal_getOption to return the expected localization
+      mockGetOption.mockImplementation(key => {
+        if (key === 'localization') {
+          return { locale: input };
+        }
+        return undefined;
+      });
+
+      const options = {
+        localization: { locale: input },
+      };
+
+      const { unmount } = render(
+        <OptionsContext.Provider value={options}>
+          <__experimental_PaymentElementProvider checkout={mockCheckout}>
+            <__experimental_PaymentElement fallback={<div>Loading...</div>} />
+          </__experimental_PaymentElementProvider>
+        </OptionsContext.Provider>,
+      );
+
+      const elements = screen.getByTestId('stripe-elements');
+      expect(elements).toHaveAttribute('data-locale', expected);
+
+      unmount();
+    });
+  });
+});