Swift Calls JSI Directly in Expo SDK 56: Removing the Objective-C++ Layer
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technical depth 8
novelty 8
actionability 6
community 7
strategic 6
personal 8
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Swift calling JSI directly in Expo SDK 56, highly technical and novel for mobile/cloud developers.
Summary
Expo SDK 56 eliminates the Objective-C++ bridge on iOS, letting Swift call JSI directly via Swift 5.9's C++ interop, yielding 1.6-2.3x faster native module calls. The ExpoModulesJSI package wraps JSI with Swift types and non-copyable ~Copyable protocols to enforce move-only semantics, while a custom concurrency layer bridges Swift async/await with React Native's callback-based threading.