Adding swift 6 concurrency with packages

swift6Concurrency.swift

// swift-tools-version: 5.9
// The swift-tools-version declares the minimum version of Swift required to build this package.

import PackageDescription

let package = Package(
    name: "Common",
    platforms: [
        .iOS(.v15),
    ],
    products: [
        .library(
            name: "Common",
            targets: ["Common"]
        ),
    ],
    targets: [
        .target(
            name: "Common",
            swiftSettings: [
                // ✅ Enable Swift 6-style concurrency warnings
                .enableUpcomingFeature("StrictConcurrency"),
                // Enable Swift version warnings without failing the build
                .unsafeFlags(["-warn-swift3-objc-inference-complete"]),
                .unsafeFlags(["-warn-implicit-overrides"]),
                .unsafeFlags(["-warn-concurrency"]),
                
                // Alternatively, you can use this to get all Swift 6 migration warnings:
                .unsafeFlags(["-enable-upcoming-feature", "ConciseMagicFile"]),
                .unsafeFlags(["-enable-upcoming-feature", "ForwardTrailingClosures"]),
                .unsafeFlags(["-enable-upcoming-feature", "ExistentialAny"]),
                .unsafeFlags(["-enable-upcoming-feature", "BareSlashRegexLiterals"]),
                
                // For strict concurrency checking (warnings only)
                .unsafeFlags(["-Xfrontend", "-warn-concurrency"]),
                .unsafeFlags(["-Xfrontend", "-enable-actor-data-race-checks"])
            ]
        ),
        .testTarget(
            name: "CommonTests",
            dependencies: ["Common"]
        ),
    ]
)