feat: Add support for WASM (#191)

**Requirements**

- [x] I have added test coverage for new or changed functionality
- [x] I have followed the repository's [pull request submission
guidelines](../blob/main/CONTRIBUTING.md#submitting-pull-requests)
- [x] I have validated my changes against all supported platform
versions

**Related issues**
#182

Author: abarker-launchdarkly

apps/flutter_client_contract_test_service/pubspec.lock

@@ -393,28 +393,28 @@ packages:
       path: "../../packages/common_client"
       relative: true
     source: path
-    version: "1.4.1"
+    version: "1.5.0"
   launchdarkly_dart_common:
     dependency: "direct overridden"
     description:
       path: "../../packages/common"
       relative: true
     source: path
-    version: "1.3.0"
+    version: "1.4.0"
   launchdarkly_event_source_client:
     dependency: "direct overridden"
     description:
       path: "../../packages/event_source_client"
       relative: true
     source: path
-    version: "1.0.0"
+    version: "1.1.0"
   launchdarkly_flutter_client_sdk:
     dependency: "direct main"
     description:
       path: "../../packages/flutter_client_sdk"
       relative: true
     source: path
-    version: "4.9.0"
+    version: "4.10.0"
   lints:
     dependency: "direct dev"
     description:

apps/sse_contract_test_service/pubspec.lock

@@ -311,7 +311,7 @@ packages:
       path: "../../packages/event_source_client"
       relative: true
     source: path
-    version: "1.0.0"
+    version: "1.1.0"
   lints:
     dependency: "direct dev"
     description:
@@ -632,6 +632,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.1.0"
+  web:
+    dependency: transitive
+    description:
+      name: web
+      sha256: "868d88a33d8a87b18ffc05f9f030ba328ffefba92d6c127917a2ba740f9cfe4a"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.1"
   web_socket_channel:
     dependency: transitive
     description:

packages/common/lib/src/config/defaults/common_default_config.dart

@@ -1,7 +1,7 @@
 import '../../ld_logging.dart';
 import 'stub_config.dart'
     if (dart.library.io) 'io_config.dart'
-    if (dart.library.html) 'js_config.dart';
+    if (dart.library.js_interop) 'js_config.dart';
 
 final class DefaultLoggingConfig {
   final defaultLogLevel = LDLogLevel.info;

packages/common/lib/src/network/http_client.dart

@@ -4,7 +4,7 @@ import '../config/defaults/common_default_config.dart';
 import '../config/http_properties.dart';
 import 'platform_client/stub_client.dart'
     if (dart.library.io) 'platform_client/io_client.dart'
-    if (dart.library.html) 'platform_client/js_client.dart';
+    if (dart.library.js_interop) 'platform_client/js_client.dart';
 import 'utils.dart';
 
 /// Http requests methods supported by the HTTP client.

packages/common_client/lib/src/config/defaults/default_config.dart

@@ -1,6 +1,6 @@
 import 'stub_config.dart'
     if (dart.library.io) 'io_config.dart'
-    if (dart.library.html) 'js_config.dart';
+    if (dart.library.js_interop) 'js_config.dart';
 
 /// Configuration common to web and mobile is contained in this file.
 ///

packages/event_source_client/lib/launchdarkly_event_source_client.dart

@@ -7,7 +7,7 @@ import 'src/http_consts.dart';
 import 'src/message_event.dart';
 import 'src/sse_client_stub.dart'
     if (dart.library.io) 'src/sse_client_http.dart'
-    if (dart.library.html) 'src/sse_client_html.dart';
+    if (dart.library.js_interop) 'src/sse_client_html.dart';
 
 export 'src/message_event.dart' show MessageEvent;
 

packages/event_source_client/lib/src/sse_client_html.dart

@@ -1,17 +1,17 @@
 import 'dart:async';
-// ignore: deprecated_member_use
-import 'dart:html' as html;
+import 'dart:js_interop';
+import 'package:web/web.dart' as web;
 import 'dart:math' as math;
 
 import '../launchdarkly_event_source_client.dart';
 
 import 'backoff.dart';
 import 'message_event.dart' as ld_message_event;
 
-/// An [SSEClient] that uses the [html.EventSource] available on most browsers for web platform support.
+/// An [SSEClient] that uses the [web.EventSource] available on most browsers for web platform support.
 class HtmlSseClient implements SSEClient {
   /// The underlying eventsource
-  html.EventSource? _eventSource;
+  web.EventSource? _eventSource;
 
   /// This controller is for the events going to the subscribers of this client.
   late final StreamController<ld_message_event.MessageEvent>
@@ -54,27 +54,29 @@ class HtmlSseClient implements SSEClient {
   }
 
   void _setupConnection() {
-    _eventSource = html.EventSource(_uri.toString());
+    _eventSource = web.EventSource(_uri.toString());
 
     for (var eventType in _eventTypes) {
-      _eventSource?.addEventListener(eventType, _handleMessageEvent);
+      _eventSource?.addEventListener(eventType, _handleMessageEvent.toJS);
     }
-    _eventSource?.addEventListener('error', _handleError);
+    _eventSource?.addEventListener('error', _handleError.toJS);
   }
 
-  void _handleError(html.Event event) {
+  void _handleError(web.Event event) {
     // The browser event source errors are reasonably opaque, if we could
     // determine the type of condition, then this is where we would
     // determine if this was a temporary or permanent failure.
     restart();
   }
 
-  void _handleMessageEvent(html.Event event) {
+  void _handleMessageEvent(web.Event event) {
     _activeSince = DateTime.now().millisecondsSinceEpoch;
-    final messageEvent = event as html.MessageEvent;
-    final ldMessageEvent = ld_message_event.MessageEvent(
-        messageEvent.type, messageEvent.data, messageEvent.lastEventId);
-    _messageEventsController.sink.add(ldMessageEvent);
+    final messageEvent = event as web.MessageEvent;
+    if (messageEvent.data != null && messageEvent.data.typeofEquals('string')) {
+      final ldMessageEvent = ld_message_event.MessageEvent(messageEvent.type,
+          (messageEvent.data as JSString).toDart, messageEvent.lastEventId);
+      _messageEventsController.sink.add(ldMessageEvent);
+    }
   }
 
   /// Subscribe to this [stream] to receive events and sometimes errors.  The first

packages/event_source_client/pubspec.yaml

@@ -9,6 +9,7 @@ environment:
 
 dependencies:
   http: ^1.1.0
+  web: ^1.1.1
 
 dev_dependencies:
   test: ^1.24.3

packages/flutter_client_sdk/example/.metadata

@@ -4,35 +4,35 @@
 # This file should be version controlled and should not be manually edited.
 
 version:
-  revision: "0f7f08d5354856ea41930f2c178a96ca97518d5a"
-  channel: "master"
+  revision: "ea121f8859e4b13e47a8f845e4586164519588bc"
+  channel: "stable"
 
 project_type: app
 
 # Tracks metadata for the flutter migrate command
 migration:
   platforms:
     - platform: root
-      create_revision: 0f7f08d5354856ea41930f2c178a96ca97518d5a
-      base_revision: 0f7f08d5354856ea41930f2c178a96ca97518d5a
+      create_revision: ea121f8859e4b13e47a8f845e4586164519588bc
+      base_revision: ea121f8859e4b13e47a8f845e4586164519588bc
     - platform: android
-      create_revision: 0f7f08d5354856ea41930f2c178a96ca97518d5a
-      base_revision: 0f7f08d5354856ea41930f2c178a96ca97518d5a
+      create_revision: ea121f8859e4b13e47a8f845e4586164519588bc
+      base_revision: ea121f8859e4b13e47a8f845e4586164519588bc
     - platform: ios
-      create_revision: 0f7f08d5354856ea41930f2c178a96ca97518d5a
-      base_revision: 0f7f08d5354856ea41930f2c178a96ca97518d5a
+      create_revision: ea121f8859e4b13e47a8f845e4586164519588bc
+      base_revision: ea121f8859e4b13e47a8f845e4586164519588bc
     - platform: linux
-      create_revision: 0f7f08d5354856ea41930f2c178a96ca97518d5a
-      base_revision: 0f7f08d5354856ea41930f2c178a96ca97518d5a
+      create_revision: ea121f8859e4b13e47a8f845e4586164519588bc
+      base_revision: ea121f8859e4b13e47a8f845e4586164519588bc
     - platform: macos
-      create_revision: 0f7f08d5354856ea41930f2c178a96ca97518d5a
-      base_revision: 0f7f08d5354856ea41930f2c178a96ca97518d5a
+      create_revision: ea121f8859e4b13e47a8f845e4586164519588bc
+      base_revision: ea121f8859e4b13e47a8f845e4586164519588bc
     - platform: web
-      create_revision: 0f7f08d5354856ea41930f2c178a96ca97518d5a
-      base_revision: 0f7f08d5354856ea41930f2c178a96ca97518d5a
+      create_revision: ea121f8859e4b13e47a8f845e4586164519588bc
+      base_revision: ea121f8859e4b13e47a8f845e4586164519588bc
     - platform: windows
-      create_revision: 0f7f08d5354856ea41930f2c178a96ca97518d5a
-      base_revision: 0f7f08d5354856ea41930f2c178a96ca97518d5a
+      create_revision: ea121f8859e4b13e47a8f845e4586164519588bc
+      base_revision: ea121f8859e4b13e47a8f845e4586164519588bc
 
   # User provided section
 

packages/flutter_client_sdk/example/web/index.html

@@ -21,7 +21,7 @@
   <meta name="description" content="A new Flutter project.">
 
   <!-- iOS meta tags & icons -->
-  <meta name="apple-mobile-web-app-capable" content="yes">
+  <meta name="mobile-web-app-capable" content="yes">
   <meta name="apple-mobile-web-app-status-bar-style" content="black">
   <meta name="apple-mobile-web-app-title" content="example">
   <link rel="apple-touch-icon" href="icons/Icon-192.png">
@@ -31,29 +31,8 @@
 
   <title>example</title>
   <link rel="manifest" href="manifest.json">
-
-  <script>
-    // The value below is injected by flutter build, do not touch.
-    const serviceWorkerVersion = null;
-  </script>
-  <!-- This script adds the flutter initialization JS code -->
-  <script src="flutter.js" defer></script>
 </head>
 <body>
-  <script>
-    window.addEventListener('load', function(ev) {
-      // Download main.dart.js
-      _flutter.loader.loadEntrypoint({
-        serviceWorker: {
-          serviceWorkerVersion: serviceWorkerVersion,
-        },
-        onEntrypointLoaded: function(engineInitializer) {
-          engineInitializer.initializeEngine().then(function(appRunner) {
-            appRunner.runApp();
-          });
-        }
-      });
-    });
-  </script>
+  <script src="flutter_bootstrap.js" async></script>
 </body>
 </html>