LibWeb: Make factory method of HTML::ModuleScript fallible

Userland/Libraries/LibWeb/HTML/Scripting/Fetching.cpp

@@ -401,7 +401,7 @@ void fetch_single_module_script(AK::URL const& url, EnvironmentSettingsObject&,
             }
 
             if (MimeSniff::is_javascript_mime_type_essence_match(*content_type_header) && module_type == "javascript"sv) {
-                auto module_script = JavaScriptModuleScript::create(url.basename(), data, module_map_settings_object, url);
+                auto module_script = JavaScriptModuleScript::create(url.basename(), data, module_map_settings_object, url).release_value_but_fixme_should_propagate_errors();
                 module_map.set(url, module_type, { ModuleMap::EntryType::ModuleScript, module_script });
                 on_complete(module_script);
                 return;
@@ -448,7 +448,7 @@ void fetch_inline_module_script_graph(DeprecatedString const& filename, Deprecat
     settings_object.disallow_further_import_maps();
 
     // 2. Let script be the result of creating a JavaScript module script using source text, settings object, base URL, and options.
-    auto script = JavaScriptModuleScript::create(filename, source_text.view(), settings_object, base_url);
+    auto script = JavaScriptModuleScript::create(filename, source_text.view(), settings_object, base_url).release_value_but_fixme_should_propagate_errors();
 
     // 3. If script is null, run onComplete given null, and return.
     if (!script) {

Userland/Libraries/LibWeb/HTML/Scripting/ModuleScript.cpp

@@ -29,7 +29,7 @@ JavaScriptModuleScript::JavaScriptModuleScript(AK::URL base_url, DeprecatedStrin
 }
 
 // https://html.spec.whatwg.org/multipage/webappapis.html#creating-a-javascript-module-script
-JS::GCPtr<JavaScriptModuleScript> JavaScriptModuleScript::create(DeprecatedString const& filename, StringView source, EnvironmentSettingsObject& settings_object, AK::URL base_url)
+WebIDL::ExceptionOr<JS::GCPtr<JavaScriptModuleScript>> JavaScriptModuleScript::create(DeprecatedString const& filename, StringView source, EnvironmentSettingsObject& settings_object, AK::URL base_url)
 {
     // 1. If scripting is disabled for settings, then set source to the empty string.
     if (settings_object.is_scripting_disabled())
@@ -38,7 +38,7 @@ JS::GCPtr<JavaScriptModuleScript> JavaScriptModuleScript::create(DeprecatedStrin
     auto& realm = settings_object.realm();
 
     // 2. Let script be a new module script that this algorithm will subsequently initialize.
-    auto script = realm.heap().allocate<JavaScriptModuleScript>(realm, move(base_url), filename, settings_object).release_allocated_value_but_fixme_should_propagate_errors();
+    auto script = MUST_OR_THROW_OOM(realm.heap().allocate<JavaScriptModuleScript>(realm, move(base_url), filename, settings_object));
 
     // 3. Set script's settings object to settings.
     // NOTE: This was already done when constructing.

Userland/Libraries/LibWeb/HTML/Scripting/ModuleScript.h

@@ -29,7 +29,7 @@ class JavaScriptModuleScript final : public ModuleScript {
 public:
     virtual ~JavaScriptModuleScript() override;
 
-    static JS::GCPtr<JavaScriptModuleScript> create(DeprecatedString const& filename, StringView source, EnvironmentSettingsObject&, AK::URL base_url);
+    static WebIDL::ExceptionOr<JS::GCPtr<JavaScriptModuleScript>> create(DeprecatedString const& filename, StringView source, EnvironmentSettingsObject&, AK::URL base_url);
 
     enum class PreventErrorReporting {
         Yes,