Swift 5.4 Released!

Swift 5.4 is now officially released! This release contains a variety of language and tooling improvements.

→ swift.org/blog/swift-5.4-released/

Swift 5.4 introduces new language features like multiple variadic parameters, extended implicit member syntax, result builders, and support for overloading local functions and property wrappers for local variables.

It improves runtime performance with faster protocol conformance checks, fewer redundant array checks, and optimised string interpolations, alongside reduced retain/release calls and smaller generic metadata.

The Swift Package Manager adds support for executable targets with @main, Windows compatibility, per-user dependency caching, automatic test discovery, and better dependency resolution diagnostics.

Build and type checking performance is enhanced with finer dependency tracking and faster code completion, while debugging on Apple platforms now better displays resilient types like URL and Date in Xcode.