feat: Add a VarTypeChange event. (#8402)

* feat: Add a VarTypeChange event.

* chore: Update copyright date.

* refactor: Inline fields in the constructor.

tests/mocha/event_var_type_change_test.js

@@ -0,0 +1,43 @@
+/**
+ * @license
+ * Copyright 2024 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import {assert} from '../../node_modules/chai/chai.js';
+import {
+  sharedTestSetup,
+  sharedTestTeardown,
+} from './test_helpers/setup_teardown.js';
+
+suite('Var Type Change Event', function () {
+  setup(function () {
+    sharedTestSetup.call(this);
+    this.workspace = new Blockly.Workspace();
+  });
+
+  teardown(function () {
+    sharedTestTeardown.call(this);
+  });
+
+  suite('Serialization', function () {
+    test('variable type change events round-trip through JSON', function () {
+      const varModel = new Blockly.VariableModel(
+        this.workspace,
+        'name',
+        'foo',
+        'id',
+      );
+      const origEvent = new Blockly.Events.VarTypeChange(
+        varModel,
+        'foo',
+        'bar',
+      );
+
+      const json = origEvent.toJson();
+      const newEvent = new Blockly.Events.fromJson(json, this.workspace);
+
+      assert.deepEqual(newEvent, origEvent);
+    });
+  });
+});

tests/mocha/index.html

@@ -76,6 +76,7 @@
       import './event_var_create_test.js';
       import './event_var_delete_test.js';
       import './event_var_rename_test.js';
+      import './event_var_type_change_test.js';
       import './event_viewport_test.js';
       import './extensions_test.js';
       import './field_checkbox_test.js';