[NathanWalker]

Summary

Swift interop stack — review bottom-up; each PR shows only its own commits. Merge in order; after a squash merge, rebase the next branch onto main. Design discussion: RFC NativeScript/rfcs#57.

1. feat(metadata-generator): Swift symbol graphs to thunks and TypeScript declarations (Swift interop 1/7) #518 generator: symbol graphs → IR → thunks + .d.ts
2. feat(runtime): ns:swift calls Swift through generated thunks (Swift interop 2/7) #519 runtime: ns:swift core
3. feat(swift-interop): modules, generics, protocols, Observation and SwiftUI (3/7) #520 modules, generics, protocols, Observation, SwiftUI
4. feat(swift-interop): generate and link thunks in app builds (4/7) #521 app builds ← this PR
5. feat(swift-interop): returning closures, generic functions, tuples, Result and C structs (5/7) #522 more values: returning closures, generic functions, tuples, Result, C structs
6. feat(swift-interop): adapter lifetime, cancellation, subscripts, Combine and operators (6/7) #523 adapter lifetime, cancellation, subscripts, Combine, operators
7. feat(swift-interop): Any, UUID and Decimal, performance, and docs (Swift interop 7/7) #517 Any/UUID/Decimal, performance, docs

Apps get thunks for the Swift modules they name, and a benchmark compares the Swift path with the Objective-C one.

App_Resources/iOS/build.xcconfig
  NS_SWIFT_MODULES = WeatherKit MyPackage
nsld.sh (iOS and visionOS templates)
  build-step-swift-interop.py
    swift-symbolgraph-extract → generator --swift-verify → swiftc → link
    unchanged module → reuse the cached thunk object

The CLI needs no change. TestRunner/app/tests/SwiftInteropBenchmarks.js adds benchmarks of the same API through both paths.

Evidence

• Before: thunks had to be generated and linked by hand.
  After: a real app (its own module, WeatherKit, a local SwiftPM package) builds through ns build ios and imports ns:swift in Debug and Release. App-level plugin modules and relative paths resolve. An unchanged module reuses its thunk object on relink.

Merge Danger

Door: two-way

Blast Radius: app builds

nsld.sh changes in the iOS and visionOS templates but does nothing unless NS_SWIFT_MODULES is set, so apps without it link exactly as before.

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