fix warning

Demo.swiftpm/Sources/AppModule/Demo.swift

@@ -29,6 +29,24 @@ extension TrackingEvent {
     }
 }
 
+struct TimestampMutation: Mutation {
+    func transform(_ e: Parchment.Loggable, id: Parchment.LoggerComponentID) -> Parchment.AnyLoggable {
+        var e = AnyLoggable(e)
+        e.parameters["createdAt"] = Date()
+        return e
+    }
+}
+
+struct UserIDMutation: Mutation {
+    let userID = 1
+
+    func transform(_ e: Parchment.Loggable, id: Parchment.LoggerComponentID) -> Parchment.AnyLoggable {
+        var e = AnyLoggable(e)
+        e.parameters["userID"] = userID
+        return e
+    }
+}
+
 let logger = LoggerBundler.make(
     components: [MyLogger(), DebugLogger()],
     bufferFlowController: DefaultBufferFlowController(pollingInterval: 5, delayInputLimit: 5)
@@ -66,6 +84,11 @@ struct ExampleAppApp: App {
             .background(Color.gray)
             .task {
                 await logger.startLogging()
+
+                await logger.add(
+                    mutations: [TimestampMutation(), UserIDMutation()]
+                )
+
                 await logger.send(event: .impletion("home"))
             }
         }

Sources/Parchment/LoggerBundler.swift

@@ -33,7 +33,7 @@ public final actor LoggerBundler {
     }
 
     public func add(mutations: [Mutation]) {
-        transform = ([transform, mutations.composed()]).composed()
+        transform = [transform, mutations.composed()].composed()
     }
 
     /// Sends a Log to the retained LoggerComponents.

Sources/Parchment/Mutation.swift

@@ -28,21 +28,30 @@ public struct AnyLoggable: Loggable {
     }
 }
 
-typealias Transform = (Loggable, LoggerComponentID) -> AnyLoggable
+typealias Transform = @Sendable (Loggable, LoggerComponentID) -> AnyLoggable
 
 public protocol Mutation: Sendable {
     func transform(_: any Loggable, id: LoggerComponentID) -> AnyLoggable
 }
 
+private extension Mutation {
+    var _transform: Transform {
+        {
+            self.transform($0, id: $1)
+        }
+    }
+}
+
 extension Sequence where Element == Mutation {
     func composed() -> Transform {
-        map { $0.transform }.composed()
+        return map { $0._transform }.composed()
     }
 }
 
 extension Sequence where Element == Transform {
     func composed() -> Transform {
-        reduce({ log, _ in AnyLoggable(log) }) { partialResult, transform in
+        let base: Transform = { log, _ in AnyLoggable(log) }
+        return reduce(base) { partialResult, transform in
             {
                 transform(partialResult($0, $1), $1)
             }

Sources/ParchmentDefault/osLogger.swift

@@ -0,0 +1,8 @@
+//
+//  File.swift
+//  
+//
+//  Created by Kohei Kawaguchi on 2023/05/20.
+//
+
+import Foundation