fix: highlight all browser language preferences

[wackerow]

Description

• Restores functionality that surfaced full list of browser language preferences to the top of the language picker.

Preview link

https://deploy-preview-16000--ethereumorg.netlify.app/es

cc: @konopkja

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[konopkja]

lgtm

[minimalsm]

@claude review plz

[claude]

Claude finished @minimalsm's task —— View job

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Code Review

Reviewing the language picker fix to restore browser language preferences functionality.

Todo List:

• Read and analyze the changed file
• Review code quality and implementation
• Check for potential issues or improvements
• Provide comprehensive feedback

Review Feedback

✅ Overall Assessment: Good Fix

This PR successfully restores the functionality to surface all browser language preferences at the top of the language picker. The implementation is well-structured and handles edge cases appropriately.

Strengths:

1. Comprehensive Language Matching (src/components/LanguagePicker/useLanguagePicker.tsx:28-43)

   • Proper handling of both exact matches and partial matches (e.g., 'en-US' → 'en')
   • Case-insensitive matching for robustness
   • Prevents duplicate preferences with !preferences.includes(match) check

2. Backward Compatibility (src/components/LanguagePicker/useLanguagePicker.tsx:46)

   • Maintains intlLocalePreference for existing code that expects single preference
   • Clean migration from single to multiple preferences

3. Smart Sorting Logic (src/components/LanguagePicker/useLanguagePicker.tsx:65-84)

   • All browser preferences float to the top
   • Browser preferences maintain their original preference order
   • Non-preference languages sorted alphabetically with proper locale-aware comparison

4. Performance Optimization

   • Uses useMemo appropriately to prevent unnecessary recalculations
   • Dependencies are correctly specified in memo arrays

Code Quality Notes:

1. Type Safety - Good use of TypeScript with proper type assertions and null checks
2. SSR Compatibility - Safely handles navigator object with typeof navigator !== "undefined" check
3. Clear Variable Naming - intlLocalePreferences vs intlLocalePreference clearly distinguishes plural/singular

Minor Suggestions:

1. Comment Clarity (src/components/LanguagePicker/useLanguagePicker.tsx:24)

   • Consider fixing typo: "users browser" → "user's browser"

2. Performance Consideration (src/components/LanguagePicker/useLanguagePicker.tsx:66-70)

   • The indexOf calls in sort could be optimized by creating a preference index map, but given typical browser language list sizes (≤10), current approach is fine

Testing Considerations:

• The preview link shows the fix working correctly with Spanish locale
• Multiple browser language preferences should now appear at the top in correct order
• Fallback behavior for users without matching preferences works as expected

Recommendation: ✅ Approve

This is a solid fix that restores important functionality while maintaining backward compatibility and code quality standards.

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