diff --git a/.dart_tool/package_config.json b/.dart_tool/package_config.json
new file mode 100644
index 0000000..5f41585
--- /dev/null
+++ b/.dart_tool/package_config.json
@@ -0,0 +1,62 @@
+{
+  "configVersion": 2,
+  "packages": [
+    {
+      "name": "characters",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/characters-1.2.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "collection",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/collection-1.15.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "flutter",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/source/repos/flutter/packages/flutter",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "material_color_utilities",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/material_color_utilities-0.1.3",
+      "packageUri": "lib/",
+      "languageVersion": "2.13"
+    },
+    {
+      "name": "meta",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/meta-1.7.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "sky_engine",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/source/repos/flutter/bin/cache/pkg/sky_engine",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "typed_data",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/typed_data-1.3.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "vector_math",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/vector_math-2.1.1",
+      "packageUri": "lib/",
+      "languageVersion": "2.14"
+    },
+    {
+      "name": "lamp",
+      "rootUri": "../",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    }
+  ],
+  "generated": "2022-03-11T12:19:29.455595Z",
+  "generator": "pub",
+  "generatorVersion": "2.16.1"
+}
diff --git a/.dart_tool/package_config_subset b/.dart_tool/package_config_subset
new file mode 100644
index 0000000..944ea0b
--- /dev/null
+++ b/.dart_tool/package_config_subset
@@ -0,0 +1,37 @@
+characters
+2.12
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/characters-1.2.0/
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/characters-1.2.0/lib/
+collection
+2.12
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/collection-1.15.0/
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/collection-1.15.0/lib/
+material_color_utilities
+2.13
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/material_color_utilities-0.1.3/
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/material_color_utilities-0.1.3/lib/
+meta
+2.12
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/meta-1.7.0/
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/meta-1.7.0/lib/
+typed_data
+2.12
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/typed_data-1.3.0/
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/typed_data-1.3.0/lib/
+vector_math
+2.14
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/vector_math-2.1.1/
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/vector_math-2.1.1/lib/
+sky_engine
+2.12
+file:///C:/Users/smacdonaldsmith/source/repos/flutter/bin/cache/pkg/sky_engine/
+file:///C:/Users/smacdonaldsmith/source/repos/flutter/bin/cache/pkg/sky_engine/lib/
+flutter
+2.12
+file:///C:/Users/smacdonaldsmith/source/repos/flutter/packages/flutter/
+file:///C:/Users/smacdonaldsmith/source/repos/flutter/packages/flutter/lib/
+lamp
+2.0
+file:///C:/Users/smacdonaldsmith/source/repos/flutter_lamp/
+file:///C:/Users/smacdonaldsmith/source/repos/flutter_lamp/lib/
+2
diff --git a/.dart_tool/version b/.dart_tool/version
new file mode 100644
index 0000000..fe18249
--- /dev/null
+++ b/.dart_tool/version
@@ -0,0 +1 @@
+2.10.3
\ No newline at end of file
diff --git a/example/.dart_tool/package_config.json b/example/.dart_tool/package_config.json
new file mode 100644
index 0000000..ef3a367
--- /dev/null
+++ b/example/.dart_tool/package_config.json
@@ -0,0 +1,158 @@
+{
+  "configVersion": 2,
+  "packages": [
+    {
+      "name": "async",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/async-2.8.2",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "boolean_selector",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/boolean_selector-2.1.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "characters",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/characters-1.2.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "charcode",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/charcode-1.3.1",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "clock",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/clock-1.1.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "collection",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/collection-1.15.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "cupertino_icons",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/cupertino_icons-0.1.3",
+      "packageUri": "lib/",
+      "languageVersion": "2.0"
+    },
+    {
+      "name": "fake_async",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/fake_async-1.2.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "flutter",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/source/repos/flutter/packages/flutter",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "flutter_test",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/source/repos/flutter/packages/flutter_test",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "lamp",
+      "rootUri": "../../",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "matcher",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/matcher-0.12.11",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "material_color_utilities",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/material_color_utilities-0.1.3",
+      "packageUri": "lib/",
+      "languageVersion": "2.13"
+    },
+    {
+      "name": "meta",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/meta-1.7.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "path",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/path-1.8.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "sky_engine",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/source/repos/flutter/bin/cache/pkg/sky_engine",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "source_span",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/source_span-1.8.1",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "stack_trace",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/stack_trace-1.10.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "stream_channel",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/stream_channel-2.1.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "string_scanner",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/string_scanner-1.1.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "term_glyph",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/term_glyph-1.2.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "test_api",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/test_api-0.4.8",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "typed_data",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/typed_data-1.3.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "vector_math",
+      "rootUri": "file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/vector_math-2.1.1",
+      "packageUri": "lib/",
+      "languageVersion": "2.14"
+    },
+    {
+      "name": "lamp_example",
+      "rootUri": "../",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    }
+  ],
+  "generated": "2022-03-11T12:22:33.790429Z",
+  "generator": "pub",
+  "generatorVersion": "2.16.1"
+}
diff --git a/example/.dart_tool/package_config_subset b/example/.dart_tool/package_config_subset
new file mode 100644
index 0000000..1616bfe
--- /dev/null
+++ b/example/.dart_tool/package_config_subset
@@ -0,0 +1,101 @@
+async
+2.12
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/async-2.8.2/
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/async-2.8.2/lib/
+boolean_selector
+2.12
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/boolean_selector-2.1.0/
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/boolean_selector-2.1.0/lib/
+characters
+2.12
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/characters-1.2.0/
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/characters-1.2.0/lib/
+charcode
+2.12
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/charcode-1.3.1/
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/charcode-1.3.1/lib/
+clock
+2.12
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/clock-1.1.0/
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/clock-1.1.0/lib/
+collection
+2.12
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/collection-1.15.0/
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/collection-1.15.0/lib/
+cupertino_icons
+2.0
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/cupertino_icons-0.1.3/
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/cupertino_icons-0.1.3/lib/
+fake_async
+2.12
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/fake_async-1.2.0/
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/fake_async-1.2.0/lib/
+matcher
+2.12
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/matcher-0.12.11/
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/matcher-0.12.11/lib/
+material_color_utilities
+2.13
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/material_color_utilities-0.1.3/
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/material_color_utilities-0.1.3/lib/
+meta
+2.12
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/meta-1.7.0/
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/meta-1.7.0/lib/
+path
+2.12
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/path-1.8.0/
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/path-1.8.0/lib/
+source_span
+2.12
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/source_span-1.8.1/
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/source_span-1.8.1/lib/
+stack_trace
+2.12
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/stack_trace-1.10.0/
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/stack_trace-1.10.0/lib/
+stream_channel
+2.12
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/stream_channel-2.1.0/
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/stream_channel-2.1.0/lib/
+string_scanner
+2.12
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/string_scanner-1.1.0/
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/string_scanner-1.1.0/lib/
+term_glyph
+2.12
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/term_glyph-1.2.0/
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/term_glyph-1.2.0/lib/
+test_api
+2.12
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/test_api-0.4.8/
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/test_api-0.4.8/lib/
+typed_data
+2.12
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/typed_data-1.3.0/
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/typed_data-1.3.0/lib/
+vector_math
+2.14
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/vector_math-2.1.1/
+file:///C:/Users/smacdonaldsmith/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/vector_math-2.1.1/lib/
+sky_engine
+2.12
+file:///C:/Users/smacdonaldsmith/source/repos/flutter/bin/cache/pkg/sky_engine/
+file:///C:/Users/smacdonaldsmith/source/repos/flutter/bin/cache/pkg/sky_engine/lib/
+flutter
+2.12
+file:///C:/Users/smacdonaldsmith/source/repos/flutter/packages/flutter/
+file:///C:/Users/smacdonaldsmith/source/repos/flutter/packages/flutter/lib/
+flutter_test
+2.12
+file:///C:/Users/smacdonaldsmith/source/repos/flutter/packages/flutter_test/
+file:///C:/Users/smacdonaldsmith/source/repos/flutter/packages/flutter_test/lib/
+lamp
+2.12
+file:///C:/Users/smacdonaldsmith/source/repos/flutter_lamp/
+file:///C:/Users/smacdonaldsmith/source/repos/flutter_lamp/lib/
+lamp_example
+2.0
+file:///C:/Users/smacdonaldsmith/source/repos/flutter_lamp/example/
+file:///C:/Users/smacdonaldsmith/source/repos/flutter_lamp/example/lib/
+2
diff --git a/example/.dart_tool/version b/example/.dart_tool/version
new file mode 100644
index 0000000..fe18249
--- /dev/null
+++ b/example/.dart_tool/version
@@ -0,0 +1 @@
+2.10.3
\ No newline at end of file
diff --git a/example/.flutter-plugins-dependencies b/example/.flutter-plugins-dependencies
new file mode 100644
index 0000000..f024375
--- /dev/null
+++ b/example/.flutter-plugins-dependencies
@@ -0,0 +1 @@
+{"info":"This is a generated file; do not edit or check into version control.","plugins":{"ios":[{"name":"lamp","path":"C:\\\\Users\\\\smacdonaldsmith\\\\source\\\\repos\\\\flutter_lamp\\\\","dependencies":[]}],"android":[{"name":"lamp","path":"C:\\\\Users\\\\smacdonaldsmith\\\\source\\\\repos\\\\flutter_lamp\\\\","dependencies":[]}],"macos":[],"linux":[],"windows":[],"web":[]},"dependencyGraph":[{"name":"lamp","dependencies":[]}],"date_created":"2022-03-11 12:22:33.862895","version":"2.10.3"}
\ No newline at end of file
diff --git a/example/ios/Flutter/flutter_export_environment.sh b/example/ios/Flutter/flutter_export_environment.sh
new file mode 100644
index 0000000..caf7f36
--- /dev/null
+++ b/example/ios/Flutter/flutter_export_environment.sh
@@ -0,0 +1,13 @@
+#!/bin/sh
+# This is a generated file; do not edit or check into version control.
+export "FLUTTER_ROOT=C:\Users\smacdonaldsmith\source\repos\flutter"
+export "FLUTTER_APPLICATION_PATH=C:\Users\smacdonaldsmith\source\repos\flutter_lamp\example"
+export "COCOAPODS_PARALLEL_CODE_SIGN=true"
+export "FLUTTER_TARGET=lib\main.dart"
+export "FLUTTER_BUILD_DIR=build"
+export "FLUTTER_BUILD_NAME=1.0.0"
+export "FLUTTER_BUILD_NUMBER=1"
+export "DART_OBFUSCATION=false"
+export "TRACK_WIDGET_CREATION=false"
+export "TREE_SHAKE_ICONS=false"
+export "PACKAGE_CONFIG=.packages"
diff --git a/example/lib/main.dart b/example/lib/main.dart
index 6c4cdbc..c8131bc 100644
--- a/example/lib/main.dart
+++ b/example/lib/main.dart
@@ -10,7 +10,7 @@ class MyApp extends StatefulWidget {
 }
 
 class _MyAppState extends State<MyApp> {
-  bool _hasFlash = false;
+  bool? _hasFlash = false;
   bool _isOn = false;
   double _intensity = 1.0;
 
@@ -21,7 +21,7 @@ class _MyAppState extends State<MyApp> {
   }
 
   initPlatformState() async {
-    bool hasFlash = await Lamp.hasLamp;
+    bool? hasFlash = await Lamp.hasLamp;
     print("Device has flash ? $hasFlash");
     setState(() { _hasFlash = hasFlash; });
   }
diff --git a/example/pubspec.yaml b/example/pubspec.yaml
index 36d78ad..c7ec4c2 100644
--- a/example/pubspec.yaml
+++ b/example/pubspec.yaml
@@ -1,6 +1,9 @@
 name: lamp_example
 description: Demonstrates how to use the lamp plugin.
 
+environment:
+  sdk: '>=2.12.0 <3.0.0'
+
 dependencies:
   flutter:
     sdk: flutter
diff --git a/lib/lamp.dart b/lib/lamp.dart
index 20a09ae..401aad3 100644
--- a/lib/lamp.dart
+++ b/lib/lamp.dart
@@ -7,7 +7,7 @@ class Lamp {
   static const MethodChannel _channel = const MethodChannel('github.com/clovisnicolas/flutter_lamp');
   static Future turnOn({double intensity = 1.0}) => _channel.invokeMethod('turnOn', {'intensity' : intensity.clamp(0.01, 1.0)});
   static Future turnOff() => _channel.invokeMethod('turnOff');
-  static Future<bool> get hasLamp async => await _channel.invokeMethod('hasLamp');
+  static Future<bool?> get hasLamp async => await _channel.invokeMethod('hasLamp');
   static Future flash(Duration duration) => turnOn().whenComplete(() => new Future.delayed(duration, () => turnOff()));
 
 }
diff --git a/pubspec.yaml b/pubspec.yaml
index 2251be5..60ba3b1 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -5,7 +5,7 @@ author: Clovis Nicolas <clovisnicolas0@gmail.com>
 homepage: https://github.com/clovisnicolas/flutter_lamp
 
 environment:
-  sdk: '>=2.0.0 <3.0.0'
+  sdk: '>=2.12.0 <3.0.0'
 
 dependencies:
   flutter: