[tool,web] Include more info URI on Wasm init failure (#125312)

packages/flutter_tools/lib/src/commands/build_web.dart

@@ -14,6 +14,7 @@ import '../runner/flutter_command.dart'
     show DevelopmentArtifact, FlutterCommandResult, FlutterOptions;
 import '../web/compile.dart';
 import '../web/file_generators/flutter_service_worker_js.dart';
+import '../web/web_constants.dart';
 import 'build.dart';
 
 class BuildWebCommand extends BuildSubCommand {
@@ -91,7 +92,7 @@ class BuildWebCommand extends BuildSubCommand {
     }
     argParser.addFlag(
       FlutterOptions.kWebWasmFlag,
-      help: 'Compile to WebAssembly rather than JavaScript.\nSee $kWasmPreviewUri for more information.',
+      help: 'Compile to WebAssembly rather than JavaScript.\n$kWasmMoreInfo',
       negatable: false,
       hide: !featureFlags.isFlutterWebWasmEnabled,
     );

packages/flutter_tools/lib/src/web/compile.dart

@@ -24,6 +24,7 @@ import '../version.dart';
 import 'compiler_config.dart';
 import 'file_generators/flutter_service_worker_js.dart';
 import 'migrations/scrub_generated_plugin_registrant.dart';
+import 'web_constants.dart';
 
 export 'compiler_config.dart';
 
@@ -63,7 +64,7 @@ class WebBuilder {
         title: 'Experimental feature',
         '''
   WebAssembly compilation is experimental.
-  See $kWasmPreviewUri for more information.''',
+  $kWasmMoreInfo''',
       );
     }
 
@@ -224,8 +225,6 @@ const Map<WebRendererMode, Map<NullSafetyMode, HostArtifact>> kDartSdkJsMapArtif
   },
 };
 
-const String kWasmPreviewUri = 'https://flutter.dev/wasm';
-
 String _buildEventAnalyticsSettings({
   required WebCompilerConfig config,
   required BuildInfo buildInfo,

packages/flutter_tools/lib/src/web/file_generators/wasm_bootstrap.dart

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import '../web_constants.dart';
+
 String generateWasmBootstrapFile(bool isSkwasm) {
   return '''
 // Copyright 2014 The Flutter Authors. All rights reserved.
@@ -18,6 +20,7 @@ String generateWasmBootstrapFile(bool isSkwasm) {
     moduleInstance = await dart2wasm_runtime.instantiate(dartModulePromise, imports);
   } catch (exception) {
     console.error(`Failed to fetch and instantiate wasm module: \${exception}`);
+    console.error('$kWasmMoreInfo');
   }
 
   if (moduleInstance) {

packages/flutter_tools/lib/src/web/web_constants.dart

+// Copyright 2014 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.
+
+const String kWasmMoreInfo = 'See https://flutter.dev/wasm for more information.';