Development workflow

Ongoing effort to port spm to use swift-build, xcode’s toolchain
Swiftly now supports mac in addition to linux, and is part of swift github projects
- Toolchains installed this way are available to choose in xcode as well
VScode extension is official by swift.org
- Background indexing, context sensitive code completion, better debugging
- Project panel with swiftly
- DocC preview
Better build times for macros, by including pre-built swift-syntax builds (when relying on tagged releases)
Better docs for compile errors
Can change types of specific errors or warnings
Better debugging of async code. Xcode can step into other threads now.

Libraries

import Subprocess
- try await run(program name, args etc
- Look at output with result.standardOutput
Foundation
- Improved notification center observing
import Observation
- Observations {} create a computed value. Value will update when any used observable things inside the closure change. As an async sequence
Testing
- Attachment.record(data, etc) Set large breadcrumbs in swift tests
- Verify that the process exits as part of the test case

Performance
- New InlineArray<count, type>, fixed size list, elements stored inside the object without heap allocation
  - Integers can now be used in type generics!
- New Span type replaces need for unsafeBufferPointer
Concurrency is more approachable
- By default, run async functions on the callers actor
- Isolated conformance: extension IsolatedThing: @MainActor AnywhereProtocol
- Mode to pick main actor by default, for mostly single threaded projects
- Mark expensive work with @concurrent, to prevent using the current actor
- In summary, start on main actor, write async code all on the main actor to avoid data races, offload specific code to background
- Some of these are opt-in settings, since they require code changes. “Approachable concurrency”, “Default actor isolation”, “Strict concurrency checking”. Migration tooling exists