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[Ferry-200]

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[gemini-code-assist]

Summary of Changes

Hello @Ferry-200, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing the application's performance by strategically implementing lazy loading for several key third-party libraries. By converting direct imports to dynamic imports, the application defers the loading of these modules until they are actually needed, which contributes to a smaller initial JavaScript bundle and a faster perceived load time for users. This change also necessitated updates to components that rely on these now-asynchronous operations, such as the Jellyfin API provider and the theming system.

Highlights

• Performance Optimization via Lazy Loading: Implemented dynamic imports for ua-parser-js, @sentry/react, and @material/material-color-utilities to reduce initial bundle size and improve application load times.
• Asynchronous API Initialization: Refactored createJellyfinApi to be asynchronous and updated JellyfinApiProvider to handle this asynchronous initialization using React's useState and useEffect hooks, including error handling and a mounted check.
• Theming System Enhancement: Modified the Material Design theming helper to dynamically load color utility functions, ensuring that theme generation also benefits from lazy loading.

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[gemini-code-assist]

Code Review

This pull request refactors the application to use dynamic imports for several large dependencies (ua-parser-js, @sentry/react, @material/material-color-utilities), which is a great step for improving initial load performance. The changes correctly adapt the code to handle the new asynchronicity, for example by making JellyfinApiProvider a stateful component.

My review focuses on improving type safety in the React component, enhancing the user experience by adding a proper loading state, fixing a potential bug in error handling, and refactoring some duplicated logic in the theme helper for better maintainability.

[gemini-code-assist]

Using any for the api state bypasses TypeScript's type checking. Import the Api type from @jellyfin/sdk and use Api | undefined as the state type for better type safety.

import type { Api } from "@jellyfin/sdk";

  const [api, setApi] = useState<Api | undefined>(undefined)

[gemini-code-assist]

Consider adding a try-catch block to handle potential errors during the dynamic import of ua-parser-js. This will prevent the entire getDeviceName function from failing if the import fails.

    try {
      const { UAParser } = await import("ua-parser-js")
    } catch (error) {
      console.error("Failed to import ua-parser-js", error);
      return ["Unknown", "Unknown", "Unknown", "Unknown"].join(' ')
    }

[gemini-code-assist]

Consider using a more specific identifier than navigator.userAgent for the device ID. The user agent can change, leading to a new device ID being generated unnecessarily. If possible, use a hardware-specific ID or a combination of identifiers that are less likely to change.

[gemini-code-assist]

The reason for a promise rejection can be any value, including an Error object. Using a template literal like `${reason}` will result in [object Object] being displayed in the UI if reason is an object. It's safer to handle this case explicitly to provide a more meaningful error message.

          setErr(reason instanceof Error ? reason.message : String(reason))

[gemini-code-assist]

The current implementation doesn't show any loading indicator while the Jellyfin API is being initialized. It renders an empty <div>, which can be confusing for users as it looks like nothing is happening.

It would be better to display an explicit loading state. Refactoring the return statement to handle loading, error, and success states separately will improve readability and user experience.

  if (err) {
    return <div>{`Failed to initialize Jellyfin API: ${err}`}</div>;
  }

  if (!api) {
    // Consider replacing this with a more sophisticated loading spinner component
    return <div>Loading...</div>;
  }

  return (
    <JellyfinApiContext.Provider value={api}>
      {children}
    </JellyfinApiContext.Provider>
  );

[gemini-code-assist]

Consider adding a fallback mechanism if Sentry fails to load. The current implementation only logs the error to the console, but it doesn't prevent the application from crashing if Sentry is essential for the application's functionality. You could display an error message to the user or disable Sentry-related features.

[gemini-code-assist]

This function, as well as applyThemeMode, calls getMaterialColorUtilitiesModule() and handles the resulting promise. This has led to:

1. Duplicated Logic: The .then(..., reason => console.error(...)) block for handling promise rejection is duplicated in both functions.
2. Inefficient Call Chain: applyThemeMode resolves the module, then calls applyThemeToBody, which then resolves the same module again. While caching prevents a second network request, it's an unnecessary async tick and makes the code harder to follow.

Consider refactoring to avoid this. One approach is to make applyThemeToBody an async function that awaits the module. Then, applyThemeMode can also be async and simply await applyThemeToBody after creating the theme from the source color. This would centralize the module fetching and make the control flow clearer.