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

PR Close #30962

packages/zone.js/lib/zone-spec/task-tracking.ts

@@ -0,0 +1,80 @@
+/**
+ * @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
+ */
+
+/**
+ * A `TaskTrackingZoneSpec` allows one to track all outstanding Tasks.
+ *
+ * This is useful in tests. For example to see which tasks are preventing a test from completing
+ * or an automated way of releasing all of the event listeners at the end of the test.
+ */
+class TaskTrackingZoneSpec implements ZoneSpec {
+  name = 'TaskTrackingZone';
+  microTasks: Task[] = [];
+  macroTasks: Task[] = [];
+  eventTasks: Task[] = [];
+  properties: {[key: string]: any} = {'TaskTrackingZone': this};
+
+  static get() { return Zone.current.get('TaskTrackingZone'); }
+
+  private getTasksFor(type: string): Task[] {
+    switch (type) {
+      case 'microTask':
+        return this.microTasks;
+      case 'macroTask':
+        return this.macroTasks;
+      case 'eventTask':
+        return this.eventTasks;
+    }
+    throw new Error('Unknown task format: ' + type);
+  }
+
+  onScheduleTask(parentZoneDelegate: ZoneDelegate, currentZone: Zone, targetZone: Zone, task: Task):
+      Task {
+    (task as any)['creationLocation'] = new Error(`Task '${task.type}' from '${task.source}'.`);
+    const tasks = this.getTasksFor(task.type);
+    tasks.push(task);
+    return parentZoneDelegate.scheduleTask(targetZone, task);
+  }
+
+  onCancelTask(parentZoneDelegate: ZoneDelegate, currentZone: Zone, targetZone: Zone, task: Task):
+      any {
+    const tasks = this.getTasksFor(task.type);
+    for (let i = 0; i < tasks.length; i++) {
+      if (tasks[i] == task) {
+        tasks.splice(i, 1);
+        break;
+      }
+    }
+    return parentZoneDelegate.cancelTask(targetZone, task);
+  }
+
+  onInvokeTask(
+      parentZoneDelegate: ZoneDelegate, currentZone: Zone, targetZone: Zone, task: Task,
+      applyThis: any, applyArgs: any): any {
+    if (task.type === 'eventTask')
+      return parentZoneDelegate.invokeTask(targetZone, task, applyThis, applyArgs);
+    const tasks = this.getTasksFor(task.type);
+    for (let i = 0; i < tasks.length; i++) {
+      if (tasks[i] == task) {
+        tasks.splice(i, 1);
+        break;
+      }
+    }
+    return parentZoneDelegate.invokeTask(targetZone, task, applyThis, applyArgs);
+  }
+
+  clearEvents() {
+    while (this.eventTasks.length) {
+      Zone.current.cancelTask(this.eventTasks[0]);
+    }
+  }
+}
+
+// Export the class so that new instances can be created with proper
+// constructor params.
+(Zone as any)['TaskTrackingZoneSpec'] = TaskTrackingZoneSpec;