build: move zone.js to angular repo (#30962)

PR Close #30962

packages/zone.js/lib/zone-spec/sync-test.ts

@@ -0,0 +1,33 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+class SyncTestZoneSpec implements ZoneSpec {
+  runZone = Zone.current;
+
+  constructor(namePrefix: string) { this.name = 'syncTestZone for ' + namePrefix; }
+
+  // ZoneSpec implementation below.
+
+  name: string;
+
+  onScheduleTask(delegate: ZoneDelegate, current: Zone, target: Zone, task: Task): Task {
+    switch (task.type) {
+      case 'microTask':
+      case 'macroTask':
+        throw new Error(`Cannot call ${task.source} from within a sync test.`);
+      case 'eventTask':
+        task = delegate.scheduleTask(target, task);
+        break;
+    }
+    return task;
+  }
+}
+
+// Export the class so that new instances can be created with proper
+// constructor params.
+(Zone as any)['SyncTestZoneSpec'] = SyncTestZoneSpec;