Feature Request: Support for modern expo-file-system API (Expo SDK 54+)

[Killer-Bee1]

Summary

The @powersync/attachments package currently requires the legacy expo-file-system API due to how AbstractAttachmentQueue constructs and passes file paths to StorageAdapter methods. This makes it incompatible with Expo SDK 54+'s modern file system API without workarounds.

Background

As of Expo SDK 54, the new object-based expo-file-system API (File, Directory, Paths) is now stable and the default. The legacy API has been moved to expo-file-system/legacy.

• Expo SDK 54 changelog: https://expo.dev/changelog/sdk-54
• New API blog post: https://expo.dev/blog/expo-file-system

The Problem

AbstractAttachmentQueue builds full URI strings and passes them to StorageAdapter methods:

// AbstractAttachmentQueue.ts
getLocalUri(filePath: string): string {
return ${this.storage.getUserStorageDirectory()}/${filePath};
// Returns: "file:///var/mobile/.../Documents/attachments/abc.jpg"
}

[stevensJourney]

Thanks for the report. It looks like the work in #735 is using expo-file-system@15 currently. The latest changes in Expo 54 are something we should definitely consider.

[Killer-Bee1]

thanks for doing that mate? yeah latest is expo-file-system 19.0.21, so its been a little bit since then