zepto-labs/react-native-delta

Delta is a runtime update system for React Native mobile apps. Its main idea is that when you push a bug fix or small feature update to users, you should only have to send them the part of the app code that actually changed, not the entire JavaScript bundle all over again. Most existing over the air update tools resend the whole bundle every time, even for a one line fix. Delta instead computes a binary difference, called a patch, between the old and new version, and sends only that difference, which makes updates much smaller and faster to download. The react-native-delta package is the SDK you add to your app. Once integrated, it automatically checks for new updates, downloads the small patch instead of the full bundle, verifies the patch before installing it to make sure it has not been tampered with or corrupted, applies it with minimal disruption to the user, and can roll back to the previous working version if an update fails partway through. It also targets updates to only the app versions they are compatible with, and reports update events so developers can track adoption. This package is one piece of a larger system. It is meant to work together with two companion projects: a command line tool for managing the update registry and uploading new release bundles, and a backend server that actually stores and serves the patches to devices. Setting it up involves installing the npm package, then doing separate native integration steps for Android and iOS. On Android this means applying a Gradle plugin, registering a unique app ID through the command line tool, and having your main application class implement a specific delegate interface. On iOS it means adding a required pod dependency with modular headers enabled and updating your app delegate to import and initialize Delta. The project requires Node.js 20 or newer, JDK 17 for Android builds, Xcode 14 or newer for iOS builds, and React Native 0.73 or newer. The README does not state a project license.