[FIX] Flutter 3.22 WASM fixes (#272)

* fix(web): migrate to dart:js_interop

* fix(web): use toJS for function eval

Author: prateekmedia

example/lib/04.performance/main.dart

@@ -5,7 +5,9 @@
 
 // ignore_for_file: avoid_print
 
-import 'dart:js' as js; // ignore: avoid_web_libraries_in_flutter
+import 'dart:js_interop' as js;
+import 'dart:js_interop_unsafe' as js_util;
+
 import 'package:flutter/material.dart';
 import 'package:flutter_code_editor/flutter_code_editor.dart';
 import 'package:flutter_highlight/themes/vs2015.dart';
@@ -56,7 +58,8 @@ final fieldFactories = <String, FieldFactory>{
       ),
 };
 
-final renderer = js.context['flutterCanvasKit'] == null ? 'HTML' : 'CanvasKit';
+final renderer =
+    js.globalContext['flutterCanvasKit'] == null ? 'HTML' : 'CanvasKit';
 
 void main() {
   runApp(CodeEditor());

lib/src/code_field/js_workarounds/js_workarounds_web.dart

@@ -1,5 +1,6 @@
 // ignore: avoid_web_libraries_in_flutter
-import 'dart:js' as js;
+import 'dart:js_interop' as js;
+import 'dart:js_interop_unsafe' as js_util;
 
 //=========================== Disable Spellcheck ===========================
 
@@ -21,7 +22,10 @@ bool _isTimerSet = false;
 
 void disableSpellCheck() {
   if (!_isTimerSet) {
-    js.context.callMethod('eval', [_jsSetDisableSpellCheckTimer]);
+    js.globalContext.callMethod(
+      'eval'.toJS,
+      _jsSetDisableSpellCheckTimer.toJS,
+    );
     _isTimerSet = true;
   }
 }
@@ -39,5 +43,5 @@ const _jsDisableBuiltinSearch = '''
 ''';
 
 void disableBuiltInSearch() {
-  js.context.callMethod('eval', [_jsDisableBuiltinSearch]);
+  js.globalContext.callMethod('eval'.toJS, _jsDisableBuiltinSearch.toJS);
 }