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Detect browser language for better localization #69

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@harperreed harperreed commented Feb 18, 2025

Pull Request: Enhance Language Detection for Chat Application

Summary

This pull request improves the initial language detection mechanism in the chat application's internationalization (i18n) configuration. It allows the application to correctly identify the user's language preference in web environments, enhancing user experience and accessibility.

Why

Many users access applications through web browsers where the language settings may not match the system language. By incorporating browser language detection alongside the existing Expo Localization method, we ensure that the application respects user preferences more accurately, providing a seamless experience for all users.

Changes Made

  • File Modified: packages/chat/app/i18n/config.ts
    • Added a new utility function getInitialLanguage to determine the initial language based on:
      • Browser language (if on the web) using navigator.language
      • Fallback to system language using Localization.locale
    • The initial language setting in the i18next config was updated to use this new function.
    • Improved the condition to check saved language preference to ensure it only changes if the saved language differs from the current language.

Changes Outline

  • Added import { Platform } from 'react-native';
  • Introduced the getInitialLanguage function:
    • Checks for browser language on web platforms.
    • Fallback to Expo Localization for system language.
  • Updated the lng property in i18next configuration to use getInitialLanguage().
  • Modified the logic for loading saved language preferences.

Closed Issues

  • N/A (This pull request does not close any existing issues but enhances functionality related to language detection.)

This update aims to improve the overall user experience by ensuring that the application defaults to the most suitable language for users regardless of the platform they are using.

Summary by CodeRabbit

  • New Features
    • Enhanced language detection now automatically selects your preferred language based on your web browser or system settings, with a fallback to English.
    • Improved language preference updates ensure the app only changes language when a new choice is made, providing a smoother localization experience.

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📥 Commits

Reviewing files that changed from the base of the PR and between d1b6cad and dc6691f.

📒 Files selected for processing (1)
  • packages/chat/app/i18n/config.ts (3 hunks)

Walkthrough

The update enhances language initialization in the chat app. A new function, getInitialLanguage, assesses the language by first checking the web browser’s language, then falling back to the system locale if necessary, and finally defaulting to English. The i18next initialization now leverages this function, and a check ensures that a saved language preference triggers a change only when it differs from the current setting.

Changes

File(s) Change Summary
packages/chat/.../config.ts Added getInitialLanguage to detect browser and system locale language; updated i18next initialization and refined saved language check.

Sequence Diagram(s)

sequenceDiagram
    participant App as Application
    participant IL as getInitialLanguage
    participant Browser as Browser
    participant System as System Locale
    participant i18next as i18next Instance

    App->>IL: Call getInitialLanguage()
    alt Running on Web
        IL->>Browser: Get navigator.language
        Browser-->>IL: Return language
        alt Language Supported?
            IL-->>App: Return browser language
        else
            IL->>System: Get Localization.locale
            System-->>IL: Return system language
            alt Language Supported?
                IL-->>App: Return system language
            else
                IL-->>App: Return default ('en')
            end
        end
    else Not on Web
        IL->>System: Get Localization.locale
        System-->>IL: Return system language
        alt Language Supported?
            IL-->>App: Return system language
        else
            IL-->>App: Return default ('en')
        end
    end
    App->>i18next: Initialize with chosen language
Loading
sequenceDiagram
    participant App as Application
    participant Storage as Saved Preferences
    participant i18next as i18next Instance

    App->>Storage: Retrieve saved language
    alt Saved language ≠ current language
        App->>i18next: Change language to saved value
    else
        note right of App: No change needed
    end
Loading

Poem

In code we found a language tale,
A browser's hint that did not fail,
System whispers bridge the gap,
Default 'en' steps in on the map,
New flows keep our chat app in full sail!


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Actionable comments posted: 1

📜 Review details

Configuration used: CodeRabbit UI
Review profile: ASSERTIVE
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 1885567 and d1b6cad.

📒 Files selected for processing (1)
  • packages/chat/app/i18n/config.ts (3 hunks)
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🔇 Additional comments (3)
packages/chat/app/i18n/config.ts (3)

4-4: LGTM!

The Platform import is correctly added for OS detection.


47-55: LGTM!

The i18next initialization correctly uses the new language detection logic.


58-62: LGTM!

The optimization to prevent unnecessary language changes is well implemented.

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
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