diff --git a/engine/src/build/config/apple/BUILD.gn b/engine/src/build/config/apple/BUILD.gn
new file mode 100644
index 00000000000..aa1129e9ea9
--- /dev/null
+++ b/engine/src/build/config/apple/BUILD.gn
@@ -0,0 +1,76 @@
+# Copyright 2013 The Flutter Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+assert(is_mac || is_ios)
+
+import("//build/config/apple/apple_sdk.gni")
+
+config("compiler") {
+  # swiftc -sdk flag.
+  if (is_ios) {
+    _sdk_root = ios_sdk_path
+    if (create_xcode_symlinks) {
+      _sdk_root = rebase_path(ios_sdk_path, root_build_dir)
+    }
+  } else if (is_mac) {
+    _sdk_root = mac_sdk_path
+    if (create_xcode_symlinks) {
+      _sdk_root = rebase_path(mac_sdk_path, root_build_dir)
+    }
+  } else {
+    assert(false, "unsupported platform")
+  }
+
+  # swiftc -target flag (target triplet).
+  # CPU architecture.
+  if (current_cpu == "x64") {
+    _triplet_cpu = "x86_64"
+  } else if (current_cpu == "arm64") {
+    _triplet_cpu = "arm64"
+  } else {
+    # x86, arm, armv7, etc.
+    assert(false, "unsupported cpu: $current_cpu")
+  }
+  # Environment.
+  if (use_ios_simulator) {
+    _triplet_environment = "-simulator"
+  } else {
+    _triplet_environment = ""
+  }
+  # OS.
+  if (is_ios) {
+    _triplet_os = "apple-ios"
+  } else if (is_mac) {
+    _triplet_os = "apple-macos"
+  } else {
+    assert(false, "unsupported Apple os")
+  }
+  _target_triplet = "$_triplet_cpu-$_triplet_os$mac_deployment_target$_triplet_environment"
+
+  # swiftc -swift-version flag.
+  #
+  # Swift 6 transition: As of April 2025, no public Flutter framework API is
+  # authored in Swift. Swift 6 is ABI-compatible with Swift 5, but not
+  # source-compatible. If any public API *is* written in Swift, it's possible
+  # we may need to prepare concurrent Swift 5 and 6 builds during a transition
+  # period.
+  _swift_version = "5"
+
+  # TODO(cbracken): https://github.com/flutter/flutter/issues/167592
+  # Look up xcode_version in apple_sdk.gni
+  #
+  # This is here so that all files get recompiled after an Xcode update.
+  # (defines are passed via the command line, and build system rebuild things
+  # when their commandline changes). Nothing should ever read this define.
+  #defines = [ "CR_XCODE_VERSION=$xcode_version" ]
+
+  swiftflags = [
+    "-sdk",
+    _sdk_root,
+    "-target",
+    _target_triplet,
+    "-swift-version",
+    _swift_version
+  ]
+}
diff --git a/engine/src/build/config/compiler/BUILD.gn b/engine/src/build/config/compiler/BUILD.gn
index 266e22885fb..b657abe4145 100644
--- a/engine/src/build/config/compiler/BUILD.gn
+++ b/engine/src/build/config/compiler/BUILD.gn
@@ -72,10 +72,8 @@ config("compiler") {
   configs = []
 
   # Platform-specific configs.
-  if (is_ios) {
-    configs += [ "//build/config/ios:compiler" ]
-  } else if (is_mac) {
-    configs += [ "//build/config/mac:compiler" ]
+  if (is_ios || is_mac) {
+    configs += [ "//build/config/apple:compiler" ]
   }
 
   # In general, Windows is totally different, but all the other builds share
diff --git a/engine/src/build/config/ios/BUILD.gn b/engine/src/build/config/ios/BUILD.gn
index 079abb60d63..774e4def775 100644
--- a/engine/src/build/config/ios/BUILD.gn
+++ b/engine/src/build/config/ios/BUILD.gn
@@ -6,66 +6,6 @@ config("sdk") {
   cflags_cc = [ "-stdlib=libc++" ]
 }
 
-config("compiler") {
-  # swiftc -sdk flag.
-  _sdk_root = ios_sdk_path
-  if (create_xcode_symlinks) {
-    _sdk_root = rebase_path(ios_sdk_path, root_build_dir)
-  }
-
-  # swiftc -target flag (target triplet).
-  # CPU architecture.
-  if (current_cpu == "x64") {
-    _triplet_cpu = "x86_64"
-  } else if (current_cpu == "arm64") {
-    _triplet_cpu = "arm64"
-  } else {
-    # x86, arm, armv7, etc.
-    assert(false, "unsupported cpu: $current_cpu")
-  }
-  # Environment.
-  if (use_ios_simulator) {
-    _triplet_environment = "-simulator"
-  } else {
-    _triplet_environment = ""
-  }
-  # OS.
-  if (is_ios) {
-    _triplet_os = "apple-ios"
-  } else if (is_mac) {
-    _triplet_os = "apple-macos"
-  } else {
-    assert(false, "unsupported Apple os")
-  }
-  _target_triplet = "$_triplet_cpu-$_triplet_os$ios_deployment_target$_triplet_environment"
-
-  # swiftc -swift-version flag.
-  #
-  # Swift 6 transition: As of April 2025, no public Flutter framework API is
-  # authored in Swift. Swift 6 is ABI-compatible with Swift 5, but not
-  # source-compatible. If any public API *is* written in Swift, it's possible
-  # we may need to prepare concurrent Swift 5 and 6 builds during a transition
-  # period.
-  _swift_version = "5"
-
-  # TODO(cbracken): https://github.com/flutter/flutter/issues/167592
-  # Look up xcode_version in apple_sdk.gni
-  #
-  # This is here so that all files get recompiled after an Xcode update.
-  # (defines are passed via the command line, and build system rebuild things
-  # when their commandline changes). Nothing should ever read this define.
-  #defines = [ "CR_XCODE_VERSION=$xcode_version" ]
-
-  swiftflags = [
-    "-sdk",
-    _sdk_root,
-    "-target",
-    _target_triplet,
-    "-swift-version",
-    _swift_version
-  ]
-}
-
 config("ios_application_extension") {
   cflags_objc = [ "-fapplication-extension" ]
   cflags_objcc = [ "-fapplication-extension" ]
diff --git a/engine/src/build/config/mac/BUILD.gn b/engine/src/build/config/mac/BUILD.gn
index ef8b1ada90d..b679282ec4c 100644
--- a/engine/src/build/config/mac/BUILD.gn
+++ b/engine/src/build/config/mac/BUILD.gn
@@ -28,53 +28,3 @@ config("mac_dynamic_flags") {
 config("mac_executable_flags") {
   ldflags = [ "-Wl,-pie" ]  # Position independent.
 }
-
-config("compiler") {
-  # swiftc -sdk flag.
-  _sdk_root = mac_sdk_path
-  if (create_xcode_symlinks) {
-    _sdk_root = rebase_path(mac_sdk_path, root_build_dir)
-  }
-
-  # swiftc -target flag (target triplet).
-  # CPU architecture.
-  if (current_cpu == "x64") {
-    _triplet_cpu = "x86_64"
-  } else if (current_cpu == "arm64") {
-    _triplet_cpu = "arm64"
-  } else {
-    # x86, arm, armv7, etc.
-    assert(false, "unsupported cpu: $current_cpu")
-  }
-  # Environment.
-  _triplet_environment = ""
-  # OS.
-  _triplet_os = "apple-macos"
-  _target_triplet = "$_triplet_cpu-$_triplet_os$mac_deployment_target$_triplet_environment"
-
-  # swiftc -swift-version flag.
-  #
-  # Swift 6 transition: As of April 2025, no public Flutter framework API is
-  # authored in Swift. Swift 6 is ABI-compatible with Swift 5, but not
-  # source-compatible. If any public API *is* written in Swift, it's possible
-  # we may need to prepare concurrent Swift 5 and 6 builds during a transition
-  # period.
-  _swift_version = "5"
-
-  # TODO(cbracken): https://github.com/flutter/flutter/issues/167592
-  # Look up xcode_version in apple_sdk.gni
-  #
-  # This is here so that all files get recompiled after an Xcode update.
-  # (defines are passed via the command line, and build system rebuild things
-  # when their commandline changes). Nothing should ever read this define.
-  #defines = [ "CR_XCODE_VERSION=$xcode_version" ]
-
-  swiftflags = [
-    "-sdk",
-    _sdk_root,
-    "-target",
-    _target_triplet,
-    "-swift-version",
-    _swift_version
-  ]
-}
diff --git a/engine/src/flutter/shell/platform/darwin/common/BUILD.gn b/engine/src/flutter/shell/platform/darwin/common/BUILD.gn
index 3881e6df3f2..89cbfd292ac 100644
--- a/engine/src/flutter/shell/platform/darwin/common/BUILD.gn
+++ b/engine/src/flutter/shell/platform/darwin/common/BUILD.gn
@@ -4,10 +4,44 @@
 
 assert(is_mac || is_ios)
 
+import("//build/config/apple/apple_sdk.gni")
 import("//flutter/common/config.gni")
 import("//flutter/testing/testing.gni")
 import("framework_common.gni")
 
+config("config") {
+  include_dirs = [ target_gen_dir ]
+  if (is_ios) {
+    lib_dirs = ios_swift_lib_paths
+  } else if (is_mac) {
+    lib_dirs = mac_swift_lib_paths
+  }
+
+  # Allow use of @testable imports in debug builds and when tests are enabled.
+  if ((is_ios && enable_ios_unittests) || (is_mac && enable_unittests)) {
+    swiftflags = [ "-enable-testing" ]
+  }
+}
+
+config("test_config") {
+  configs = [ ":config" ]
+
+  # Add platform frameworks directory to search path for test frameworks.
+  # Add platform lib to search path for test libraries/Swift modules.
+  cflags = [ "-fvisibility=default" ]
+
+  if (is_ios) {
+    _platform_path = ios_platform_path
+  } else if (is_mac) {
+    _platform_path = mac_platform_path
+  }
+  cflags += [ "-F$_platform_path/Developer/Library/Frameworks" ]
+  swiftflags = [ "-F$_platform_path/Developer/Library/Frameworks" ]
+  include_dirs = [ "$_platform_path/Developer/usr/lib" ]
+  framework_dirs = [ "$_platform_path/Developer/Library/Frameworks" ]
+  lib_dirs = [ "$_platform_path/Developer/usr/lib" ]
+}
+
 source_set("common") {
   cflags_objc = flutter_cflags_objc
   cflags_objcc = flutter_cflags_objcc
diff --git a/engine/src/flutter/shell/platform/darwin/ios/BUILD.gn b/engine/src/flutter/shell/platform/darwin/ios/BUILD.gn
index e0b1a1c3976..6a499179bfb 100644
--- a/engine/src/flutter/shell/platform/darwin/ios/BUILD.gn
+++ b/engine/src/flutter/shell/platform/darwin/ios/BUILD.gn
@@ -22,31 +22,6 @@ shell_gpu_configuration("ios_gpu_configuration") {
   enable_metal = true
 }
 
-config("config_ios") {
-  include_dirs = [ target_gen_dir ]
-  lib_dirs = ios_swift_lib_paths
-
-  # Allow use of @testable imports in debug builds and when tests are enabled.
-  if (enable_ios_unittests) {
-    swiftflags = [ "-enable-testing" ]
-  }
-}
-
-config("config_ios_test") {
-  configs = [ ":config_ios" ]
-
-  # Add platform frameworks directory to search path for test frameworks.
-  # Add platform lib to search path for test libraries/Swift modules.
-  cflags = [
-    "-fvisibility=default",
-    "-F$ios_platform_path/Developer/Library/Frameworks",
-  ]
-  swiftflags = [ "-F$ios_platform_path/Developer/Library/Frameworks" ]
-  include_dirs = [ "$ios_platform_path/Developer/usr/lib" ]
-  framework_dirs = [ "$ios_platform_path/Developer/Library/Frameworks" ]
-  lib_dirs = [ "$ios_platform_path/Developer/usr/lib" ]
-}
-
 # The headers that will be copied to the Flutter.framework and be accessed
 # from outside the Flutter engine source root.
 _flutter_framework_headers = [
@@ -66,7 +41,7 @@ _flutter_framework_headers_copy_dir = "$_flutter_framework_dir/Headers"
 
 source_set("InternalFlutterSwift") {
   visibility = [ ":*" ]
-  configs += [ ":config_ios" ]
+  configs += [ "//flutter/shell/platform/darwin/common:config" ]
 
   sources = [
     "framework/Source/ConnectionCollection.swift",
@@ -85,7 +60,7 @@ source_set("flutter_framework_source") {
     "//flutter:config",
   ]
   configs += [
-    ":config_ios",
+    "//flutter/shell/platform/darwin/common:config",
     "//build/config/ios:ios_application_extension",
   ]
 
@@ -224,7 +199,7 @@ if (enable_ios_unittests) {
   source_set("ios_test_flutter_swift") {
     testonly = true
     visibility = [ ":*" ]
-    configs += [ ":config_ios_test" ]
+    configs += [ "//flutter/shell/platform/darwin/common:test_config" ]
     sources = [
       "framework/Source/ConnectionCollectionTest.swift",
       "framework/Source/FakeUIPressProxy.swift",
@@ -247,11 +222,14 @@ if (enable_ios_unittests) {
     ldflags =
         [ "-Wl,-install_name,@rpath/Frameworks/libios_test_flutter.dylib" ]
     frameworks = [ "XCTest.framework" ]
-    configs += [ ":config_ios_test" ]
+    include_dirs = [ target_gen_dir ]
+
+    configs += [ "//flutter/shell/platform/darwin/common:test_config" ]
     configs -= [
       "//build/config/gcc:symbol_visibility_hidden",
       "//build/config:symbol_visibility_hidden",
     ]
+
     sources = [
       "framework/Source/FlutterAppDelegateTest.mm",
       "framework/Source/FlutterChannelKeyResponderTest.mm",
diff --git a/engine/src/flutter/shell/platform/darwin/macos/BUILD.gn b/engine/src/flutter/shell/platform/darwin/macos/BUILD.gn
index ad77009a1c1..06557229e22 100644
--- a/engine/src/flutter/shell/platform/darwin/macos/BUILD.gn
+++ b/engine/src/flutter/shell/platform/darwin/macos/BUILD.gn
@@ -18,31 +18,6 @@ shell_gpu_configuration("macos_gpu_configuration") {
   enable_metal = true
 }
 
-config("config_macos") {
-  include_dirs = [ target_gen_dir ]
-  lib_dirs = mac_swift_lib_paths
-
-  # Allow use of @testable imports in debug builds and when tests are enabled.
-  if (enable_unittests) {
-    swiftflags = [ "-enable-testing" ]
-  }
-}
-
-config("config_macos_test") {
-  configs = [ ":config_macos" ]
-
-  # Add platform frameworks directory to search path for test frameworks.
-  # Add platform lib to search path for test libraries/Swift modules.
-  cflags = [
-    "-fvisibility=default",
-    "-F$mac_platform_path/Developer/Library/Frameworks",
-  ]
-  swiftflags = [ "-F$mac_platform_path/Developer/Library/Frameworks" ]
-  include_dirs = [ "$mac_platform_path/Developer/usr/lib" ]
-  framework_dirs = [ "$mac_platform_path/Developer/Library/Frameworks" ]
-  lib_dirs = [ "$mac_platform_path/Developer/usr/lib" ]
-}
-
 group("macos") {
   deps = [ ":flutter_framework" ]
   if (build_glfw_shell) {
@@ -77,7 +52,7 @@ _flutter_framework_headers_copy_dir =
 
 source_set("InternalFlutterSwift") {
   visibility = [ ":*" ]
-  configs += [ ":config_macos" ]
+  configs += [ "//flutter/shell/platform/darwin/common:config" ]
 
   sources = [ "framework/Source/FlutterRunLoop.swift" ]
 }