Apply standard Swift package configuration (#389)

Author: tinder-cfuller

Makefile

@@ -60,12 +60,12 @@ docs:
 		-destination "$(destination)" \
 		-derivedDataPath "$(DERIVED_DATA_PATH)" \
 		-skipPackagePluginValidation \
-		OTHER_DOCC_FLAGS="--warnings-as-errors"
+		$(if $(filter $(open),OPEN),OTHER_DOCC_FLAGS="--warnings-as-errors",)
 	@find "$(DERIVED_DATA_PATH)" \
 		-type d \
 		-name "$(target).doccarchive" \
 		-exec cp -R {} "$(ARCHIVE_PATH)/" \;
-	$(if $(filter $(open),OPEN),@open "$(ARCHIVE_PATH)/$(target).doccarchive",)
+	@$(if $(filter $(open),OPEN),open "$(ARCHIVE_PATH)/$(target).doccarchive",:)
 
 .PHONY: site
 site: target ?= Layout

Package.resolved

@@ -58,17 +58,28 @@ let package = Package(
 
 package.targets.forEach { target in
 
-    // TODO: Remove upon enabling Swift 6 language mode:
+    let types: [Target.TargetType] = [
+        .regular,
+        .test,
+        .executable,
+        .plugin,
+        .macro,
+    ]
+
+    guard types.contains(target.type)
+    else { return }
+
     target.swiftSettings = (target.swiftSettings ?? []) + [.enableExperimentalFeature("StrictConcurrency")]
 
-    if treatWarningsAsErrors {
-        target.swiftSettings = (target.swiftSettings ?? []) + [
-            // TODO: Remove unsafe flag upon upgrading to Swift tools v6.2 and uncomment subsequent settings:
-            .unsafeFlags(["-warnings-as-errors"]),
+//    if treatWarningsAsErrors {
+//        target.swiftSettings = (target.swiftSettings ?? []) + [
 //            .treatAllWarnings(as: .error),
 //            .treatWarning("DeprecatedDeclaration", as: .warning),
-        ]
-    }
+//        ]
+//    }
+
+    guard target.type != .macro
+    else { return }
 
     if enableSwiftLintBuildToolPlugin {
         target.plugins = (target.plugins ?? []) + [

Package.swift

@@ -56,7 +56,12 @@ public enum ConstraintsBuilder {
     /// https://docs.swift.org/swift-book/documentation/the-swift-programming-language/attributes/#resultBuilder
     /// ) for more information.
     public static func buildBlock(_ components: Component...) -> Component {
+        #if swift(>=6.0)
         components.flatMap(\.self)
+        #else
+        // swiftlint:disable:next prefer_key_path
+        components.flatMap { $0 }
+        #endif
     }
 
     /// See result builder [documentation](
@@ -84,7 +89,12 @@ public enum ConstraintsBuilder {
     /// https://docs.swift.org/swift-book/documentation/the-swift-programming-language/attributes/#resultBuilder
     /// ) for more information.
     public static func buildArray(_ components: [Component]) -> Component {
+        #if swift(>=6.0)
         components.flatMap(\.self)
+        #else
+        // swiftlint:disable:next prefer_key_path
+        components.flatMap { $0 }
+        #endif
     }
 
     /// See result builder [documentation](

Sources/Layout/Builders/ConstraintsBuilder.swift

@@ -54,7 +54,12 @@ public enum LayoutBuilder {
     /// https://docs.swift.org/swift-book/documentation/the-swift-programming-language/attributes/#resultBuilder
     /// ) for more information.
     public static func buildBlock(_ components: Component...) -> Component {
+        #if swift(>=6.0)
         components.flatMap(\.self)
+        #else
+        // swiftlint:disable:next prefer_key_path
+        components.flatMap { $0 }
+        #endif
     }
 
     /// See result builder [documentation](
@@ -82,7 +87,12 @@ public enum LayoutBuilder {
     /// https://docs.swift.org/swift-book/documentation/the-swift-programming-language/attributes/#resultBuilder
     /// ) for more information.
     public static func buildArray(_ components: [Component]) -> Component {
+        #if swift(>=6.0)
         components.flatMap(\.self)
+        #else
+        // swiftlint:disable:next prefer_key_path
+        components.flatMap { $0 }
+        #endif
     }
 
     /// See result builder [documentation](