Expo runtime

This runtime targets Expo SDK 57. Install @party-stack/expo-runtime and its Expo peer dependencies using SDK 57-compatible versions. Expo installs expo/fetch as the default native fetch starting in SDK 56; no separate expo-fetch package or fetch installer is needed. The runtime includes expo-blob.

Import the required polyfill first in your application entry point, before importing application code or creating clients:

import "@party-stack/expo-runtime/polyfill";
import "expo-router/entry";

Then use createExpoRuntime from @party-stack/expo-runtime as your installation's runtime provider.

The polyfill replaces global Blob with Expo Blob and global File with a compatible class extending Expo Blob. It leaves Expo’s installed fetch unchanged. Import it once at startup; it is a separate entry point so importing the runtime alone does not replace Blob or File. Attachment uploads use Expo’s default fetch; do not opt back into React Native fetch with EXPO_PUBLIC_USE_RN_FETCH.

Attachment storage requires blobs with arrayBuffer(), as provided by Expo Blob and Expo File. Blobs returned by other native libraries may still use React Native's older Blob implementation; convert those to compatible blobs before passing them to the runtime. Cache reads return expo-file-system File objects, which Expo fetch accepts as upload bodies.