Add in web support to the plugin.

example/pubspec.yaml

@@ -1,78 +1,21 @@
 name: flutter_native_timezone_example
 description: A new example flutter project.
-
-# The following line prevents the package from being accidentally published to
-# pub.dev using `pub publish`. This is preferred for private packages.
 publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 
-# The following defines the version and build number for your application.
-# A version number is three numbers separated by dots, like 1.2.43
-# followed by an optional build number separated by a +.
-# Both the version and the builder number may be overridden in flutter
-# build by specifying --build-name and --build-number, respectively.
-# In Android, build-name is used as versionName while build-number used as versionCode.
-# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
-# In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
-# Read more about iOS versioning at
-# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.7.0 <3.0.0"
+  sdk: ">=2.12.0 <3.0.0"
 
 dependencies:
   flutter:
     sdk: flutter
   flutter_native_timezone:
     path: ..
 
-
-  # The following adds the Cupertino Icons font to your application.
-  # Use with the CupertinoIcons class for iOS style icons.
-  cupertino_icons: ^1.0.2
-
 dev_dependencies:
   flutter_test:
     sdk: flutter
 
-# For information on the generic Dart part of this file, see the
-# following page: https://dart.dev/tools/pub/pubspec
-
-# The following section is specific to Flutter.
 flutter:
-
-  # The following line ensures that the Material Icons font is
-  # included with your application, so that you can use the icons in
-  # the material Icons class.
   uses-material-design: true
-
-  # To add assets to your application, add an assets section, like this:
-  # assets:
-  #   - images/a_dot_burr.jpeg
-  #   - images/a_dot_ham.jpeg
-
-  # An image asset can refer to one or more resolution-specific "variants", see
-  # https://flutter.dev/assets-and-images/#resolution-aware.
-
-  # For details regarding adding assets from package dependencies, see
-  # https://flutter.dev/assets-and-images/#from-packages
-
-  # To add custom fonts to your application, add a fonts section here,
-  # in this "flutter" section. Each entry in this list should have a
-  # "family" key with the font family name, and a "fonts" key with a
-  # list giving the asset and other descriptors for the font. For
-  # example:
-  # fonts:
-  #   - family: Schyler
-  #     fonts:
-  #       - asset: fonts/Schyler-Regular.ttf
-  #       - asset: fonts/Schyler-Italic.ttf
-  #         style: italic
-  #   - family: Trajan Pro
-  #     fonts:
-  #       - asset: fonts/TrajanPro.ttf
-  #       - asset: fonts/TrajanPro_Bold.ttf
-  #         weight: 700
-  #
-  # For details regarding fonts from package dependencies,
-  # see https://flutter.dev/custom-fonts/#from-packages

lib/flutter_native_timezone_web.dart

@@ -0,0 +1,60 @@
+import 'dart:async';
+import 'dart:html' as html;
+
+import 'package:flutter/services.dart';
+import 'package:flutter_web_plugins/flutter_web_plugins.dart';
+import 'package:js/js.dart';
+
+///
+/// The plugin class for the web, acts as the plugin inside bits
+/// and connects to the js world.
+///
+class FlutterNativeTimezonePlugin {
+  static void registerWith(Registrar registrar) {
+    final MethodChannel channel = MethodChannel(
+        'flutter_native_timezone',
+        const StandardMethodCodec(),
+        registrar.messenger);
+    final FlutterNativeTimezonePlugin instance = FlutterNativeTimezonePlugin();
+    channel.setMethodCallHandler(instance.handleMethodCall);
+  }
+
+  Future<dynamic> handleMethodCall(MethodCall call) async {
+    switch (call.method) {
+      case 'getLocalTimezone':
+        return _getLocalTimeZone();
+      case 'getAvailableTimezones':
+        return [ _getLocalTimeZone() ];
+      default:
+        throw PlatformException(
+            code: 'Unimplemented',
+            details: "The flutter_native_timezone plugin for web doesn't implement "
+                "the method '${call.method}'");
+    }
+  }
+
+  /// Platform-specific implementation of determining the user's
+  /// local time zone when running on the web.
+  ///
+  String _getLocalTimeZone() {
+    return jsDateTimeFormat()
+        .resolvedOptions()
+        .timeZone;
+  }
+}
+
+@JS('Intl.DateTimeFormat')
+external _JSDateTimeFormat jsDateTimeFormat();
+
+@JS()
+abstract class _JSDateTimeFormat {
+  @JS()
+  external _JSResolvedOptions resolvedOptions();
+}
+
+@JS()
+abstract class _JSResolvedOptions {
+  @JS()
+  external String get timeZone;
+}
+

pubspec.yaml

@@ -8,6 +8,8 @@ environment:
   flutter: ">=1.12.0"
 
 dependencies:
+  flutter_web_plugins:
+    sdk: flutter
   flutter:
     sdk: flutter
 
@@ -27,3 +29,6 @@ flutter:
         pluginClass: FlutterNativeTimezonePlugin
       macos:
         pluginClass: FlutterNativeTimezonePlugin
+      web:
+        pluginClass: FlutterNativeTimezonePlugin
+        fileName: flutter_native_timezone_web.dart