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Keeping your desktop application up-to-date is crucial for user experience and security. Auto-updates ensure users always have the latest features and bug fixes.

• Improved Security: Patches vulnerabilities quickly.
• New Features: Delivers enhancements without manual effort.
• Bug Fixes: Resolves issues seamlessly.
• Better User Experience: Users enjoy a consistently fresh and stable app.

electron-updater is a powerful module that simplifies adding auto-update functionality to your Electron app. It handles the complex logic of checking for new versions, downloading them, and installing them.

It works by looking for new releases on a configured update server (like GitHub Releases, Amazon S3, or a custom server) and managing the update process.

First, you need to install electron-updater as a dependency in your Electron project. It's best to add it as a regular dependency, not a dev dependency, as it's part of your deployed application.

Open your terminal in your project's root directory and run:

To use electron-updater, you'll primarily work in your app's main process (usually main.js). You'll import autoUpdater and call its checkForUpdates() method when your app is ready.

Note: This code is part of an Electron app's main process and requires a full Electron environment to run. It won't execute in a standard JavaScript playground.

electron-updater uses an event-driven model. This means you 'listen' for specific events that occur during the update process and react to them. This allows you to provide feedback to your users.

• checking-for-update: Update check started.
• update-available: New version found.
• update-not-available: No new version.
• download-progress: Update download progress.
• update-downloaded: Update ready to install.
• error: Something went wrong.

The checking-for-update event is fired as soon as checkForUpdates() is called. It's a good place to show a loading indicator or a message to the user.

Remember: This code needs to be in your Electron main.js file.

When electron-updater finds a new version, it emits the update-available event. At this point, the update download usually begins automatically. You can use this event to notify the user that an update is being downloaded.

Once the update has been fully downloaded, the update-downloaded event is emitted. This is the critical moment! You should notify the user and ask them to restart the application to apply the update.

The autoUpdater.quitAndInstall() method will close all windows and install the update, then relaunch the app.

It's important to handle cases where there are no updates or if an error occurs during the process. The update-not-available event lets you know when your app is already the latest version.

The error event is crucial for debugging and informing users if something went wrong during the update check or download.

You've learned about the main events in the electron-updater lifecycle. Which of the following statements about auto-updates are generally true?

In this lesson, you've learned how to implement auto-update functionality in your Electron applications using the electron-updater module.

• We covered its installation and basic setup in the main process.
• You explored key events like checking-for-update, update-available, update-downloaded, and error.
• Understanding these events allows you to build a robust and user-friendly update experience, ensuring your users always have the best version of your app.