@angular/core
Version:
Angular - the core framework
387 lines • 48 kB
JavaScript
/**
* @license
* Copyright Google LLC 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
*/
import { EventEmitter } from '../event_emitter';
import { global } from '../util/global';
import { noop } from '../util/noop';
import { getNativeRequestAnimationFrame } from '../util/raf';
/**
* An injectable service for executing work inside or outside of the Angular zone.
*
* The most common use of this service is to optimize performance when starting a work consisting of
* one or more asynchronous tasks that don't require UI updates or error handling to be handled by
* Angular. Such tasks can be kicked off via {@link #runOutsideAngular} and if needed, these tasks
* can reenter the Angular zone via {@link #run}.
*
* <!-- TODO: add/fix links to:
* - docs explaining zones and the use of zones in Angular and change-detection
* - link to runOutsideAngular/run (throughout this file!)
* -->
*
* @usageNotes
* ### Example
*
* ```
* import {Component, NgZone} from '@angular/core';
* import {NgIf} from '@angular/common';
*
* @Component({
* selector: 'ng-zone-demo',
* template: `
* <h2>Demo: NgZone</h2>
*
* <p>Progress: {{progress}}%</p>
* <p *ngIf="progress >= 100">Done processing {{label}} of Angular zone!</p>
*
* <button (click)="processWithinAngularZone()">Process within Angular zone</button>
* <button (click)="processOutsideOfAngularZone()">Process outside of Angular zone</button>
* `,
* })
* export class NgZoneDemo {
* progress: number = 0;
* label: string;
*
* constructor(private _ngZone: NgZone) {}
*
* // Loop inside the Angular zone
* // so the UI DOES refresh after each setTimeout cycle
* processWithinAngularZone() {
* this.label = 'inside';
* this.progress = 0;
* this._increaseProgress(() => console.log('Inside Done!'));
* }
*
* // Loop outside of the Angular zone
* // so the UI DOES NOT refresh after each setTimeout cycle
* processOutsideOfAngularZone() {
* this.label = 'outside';
* this.progress = 0;
* this._ngZone.runOutsideAngular(() => {
* this._increaseProgress(() => {
* // reenter the Angular zone and display done
* this._ngZone.run(() => { console.log('Outside Done!'); });
* });
* });
* }
*
* _increaseProgress(doneCallback: () => void) {
* this.progress += 1;
* console.log(`Current progress: ${this.progress}%`);
*
* if (this.progress < 100) {
* window.setTimeout(() => this._increaseProgress(doneCallback), 10);
* } else {
* doneCallback();
* }
* }
* }
* ```
*
* @publicApi
*/
export class NgZone {
constructor({ enableLongStackTrace = false, shouldCoalesceEventChangeDetection = false, shouldCoalesceRunChangeDetection = false }) {
this.hasPendingMacrotasks = false;
this.hasPendingMicrotasks = false;
/**
* Whether there are no outstanding microtasks or macrotasks.
*/
this.isStable = true;
/**
* Notifies when code enters Angular Zone. This gets fired first on VM Turn.
*/
this.onUnstable = new EventEmitter(false);
/**
* Notifies when there is no more microtasks enqueued in the current VM Turn.
* This is a hint for Angular to do change detection, which may enqueue more microtasks.
* For this reason this event can fire multiple times per VM Turn.
*/
this.onMicrotaskEmpty = new EventEmitter(false);
/**
* Notifies when the last `onMicrotaskEmpty` has run and there are no more microtasks, which
* implies we are about to relinquish VM turn.
* This event gets called just once.
*/
this.onStable = new EventEmitter(false);
/**
* Notifies that an error has been delivered.
*/
this.onError = new EventEmitter(false);
if (typeof Zone == 'undefined') {
throw new Error(`In this configuration Angular requires Zone.js`);
}
Zone.assertZonePatched();
const self = this;
self._nesting = 0;
self._outer = self._inner = Zone.current;
if (Zone['TaskTrackingZoneSpec']) {
self._inner = self._inner.fork(new Zone['TaskTrackingZoneSpec']);
}
if (enableLongStackTrace && Zone['longStackTraceZoneSpec']) {
self._inner = self._inner.fork(Zone['longStackTraceZoneSpec']);
}
// if shouldCoalesceRunChangeDetection is true, all tasks including event tasks will be
// coalesced, so shouldCoalesceEventChangeDetection option is not necessary and can be skipped.
self.shouldCoalesceEventChangeDetection =
!shouldCoalesceRunChangeDetection && shouldCoalesceEventChangeDetection;
self.shouldCoalesceRunChangeDetection = shouldCoalesceRunChangeDetection;
self.lastRequestAnimationFrameId = -1;
self.nativeRequestAnimationFrame = getNativeRequestAnimationFrame().nativeRequestAnimationFrame;
forkInnerZoneWithAngularBehavior(self);
}
static isInAngularZone() {
return Zone.current.get('isAngularZone') === true;
}
static assertInAngularZone() {
if (!NgZone.isInAngularZone()) {
throw new Error('Expected to be in Angular Zone, but it is not!');
}
}
static assertNotInAngularZone() {
if (NgZone.isInAngularZone()) {
throw new Error('Expected to not be in Angular Zone, but it is!');
}
}
/**
* Executes the `fn` function synchronously within the Angular zone and returns value returned by
* the function.
*
* Running functions via `run` allows you to reenter Angular zone from a task that was executed
* outside of the Angular zone (typically started via {@link #runOutsideAngular}).
*
* Any future tasks or microtasks scheduled from within this function will continue executing from
* within the Angular zone.
*
* If a synchronous error happens it will be rethrown and not reported via `onError`.
*/
run(fn, applyThis, applyArgs) {
return this._inner.run(fn, applyThis, applyArgs);
}
/**
* Executes the `fn` function synchronously within the Angular zone as a task and returns value
* returned by the function.
*
* Running functions via `run` allows you to reenter Angular zone from a task that was executed
* outside of the Angular zone (typically started via {@link #runOutsideAngular}).
*
* Any future tasks or microtasks scheduled from within this function will continue executing from
* within the Angular zone.
*
* If a synchronous error happens it will be rethrown and not reported via `onError`.
*/
runTask(fn, applyThis, applyArgs, name) {
const zone = this._inner;
const task = zone.scheduleEventTask('NgZoneEvent: ' + name, fn, EMPTY_PAYLOAD, noop, noop);
try {
return zone.runTask(task, applyThis, applyArgs);
}
finally {
zone.cancelTask(task);
}
}
/**
* Same as `run`, except that synchronous errors are caught and forwarded via `onError` and not
* rethrown.
*/
runGuarded(fn, applyThis, applyArgs) {
return this._inner.runGuarded(fn, applyThis, applyArgs);
}
/**
* Executes the `fn` function synchronously in Angular's parent zone and returns value returned by
* the function.
*
* Running functions via {@link #runOutsideAngular} allows you to escape Angular's zone and do
* work that
* doesn't trigger Angular change-detection or is subject to Angular's error handling.
*
* Any future tasks or microtasks scheduled from within this function will continue executing from
* outside of the Angular zone.
*
* Use {@link #run} to reenter the Angular zone and do work that updates the application model.
*/
runOutsideAngular(fn) {
return this._outer.run(fn);
}
}
const EMPTY_PAYLOAD = {};
function checkStable(zone) {
// TODO: @JiaLiPassion, should check zone.isCheckStableRunning to prevent
// re-entry. The case is:
//
// @Component({...})
// export class AppComponent {
// constructor(private ngZone: NgZone) {
// this.ngZone.onStable.subscribe(() => {
// this.ngZone.run(() => console.log('stable'););
// });
// }
//
// The onStable subscriber run another function inside ngZone
// which causes `checkStable()` re-entry.
// But this fix causes some issues in g3, so this fix will be
// launched in another PR.
if (zone._nesting == 0 && !zone.hasPendingMicrotasks && !zone.isStable) {
try {
zone._nesting++;
zone.onMicrotaskEmpty.emit(null);
}
finally {
zone._nesting--;
if (!zone.hasPendingMicrotasks) {
try {
zone.runOutsideAngular(() => zone.onStable.emit(null));
}
finally {
zone.isStable = true;
}
}
}
}
}
function delayChangeDetectionForEvents(zone) {
/**
* We also need to check _nesting here
* Consider the following case with shouldCoalesceRunChangeDetection = true
*
* ngZone.run(() => {});
* ngZone.run(() => {});
*
* We want the two `ngZone.run()` only trigger one change detection
* when shouldCoalesceRunChangeDetection is true.
* And because in this case, change detection run in async way(requestAnimationFrame),
* so we also need to check the _nesting here to prevent multiple
* change detections.
*/
if (zone.isCheckStableRunning || zone.lastRequestAnimationFrameId !== -1) {
return;
}
zone.lastRequestAnimationFrameId = zone.nativeRequestAnimationFrame.call(global, () => {
// This is a work around for https://github.com/angular/angular/issues/36839.
// The core issue is that when event coalescing is enabled it is possible for microtasks
// to get flushed too early (As is the case with `Promise.then`) between the
// coalescing eventTasks.
//
// To workaround this we schedule a "fake" eventTask before we process the
// coalescing eventTasks. The benefit of this is that the "fake" container eventTask
// will prevent the microtasks queue from getting drained in between the coalescing
// eventTask execution.
if (!zone.fakeTopEventTask) {
zone.fakeTopEventTask = Zone.root.scheduleEventTask('fakeTopEventTask', () => {
zone.lastRequestAnimationFrameId = -1;
updateMicroTaskStatus(zone);
zone.isCheckStableRunning = true;
checkStable(zone);
zone.isCheckStableRunning = false;
}, undefined, () => { }, () => { });
}
zone.fakeTopEventTask.invoke();
});
updateMicroTaskStatus(zone);
}
function forkInnerZoneWithAngularBehavior(zone) {
const delayChangeDetectionForEventsDelegate = () => {
delayChangeDetectionForEvents(zone);
};
zone._inner = zone._inner.fork({
name: 'angular',
properties: { 'isAngularZone': true },
onInvokeTask: (delegate, current, target, task, applyThis, applyArgs) => {
try {
onEnter(zone);
return delegate.invokeTask(target, task, applyThis, applyArgs);
}
finally {
if ((zone.shouldCoalesceEventChangeDetection && task.type === 'eventTask') ||
zone.shouldCoalesceRunChangeDetection) {
delayChangeDetectionForEventsDelegate();
}
onLeave(zone);
}
},
onInvoke: (delegate, current, target, callback, applyThis, applyArgs, source) => {
try {
onEnter(zone);
return delegate.invoke(target, callback, applyThis, applyArgs, source);
}
finally {
if (zone.shouldCoalesceRunChangeDetection) {
delayChangeDetectionForEventsDelegate();
}
onLeave(zone);
}
},
onHasTask: (delegate, current, target, hasTaskState) => {
delegate.hasTask(target, hasTaskState);
if (current === target) {
// We are only interested in hasTask events which originate from our zone
// (A child hasTask event is not interesting to us)
if (hasTaskState.change == 'microTask') {
zone._hasPendingMicrotasks = hasTaskState.microTask;
updateMicroTaskStatus(zone);
checkStable(zone);
}
else if (hasTaskState.change == 'macroTask') {
zone.hasPendingMacrotasks = hasTaskState.macroTask;
}
}
},
onHandleError: (delegate, current, target, error) => {
delegate.handleError(target, error);
zone.runOutsideAngular(() => zone.onError.emit(error));
return false;
}
});
}
function updateMicroTaskStatus(zone) {
if (zone._hasPendingMicrotasks ||
((zone.shouldCoalesceEventChangeDetection || zone.shouldCoalesceRunChangeDetection) &&
zone.lastRequestAnimationFrameId !== -1)) {
zone.hasPendingMicrotasks = true;
}
else {
zone.hasPendingMicrotasks = false;
}
}
function onEnter(zone) {
zone._nesting++;
if (zone.isStable) {
zone.isStable = false;
zone.onUnstable.emit(null);
}
}
function onLeave(zone) {
zone._nesting--;
checkStable(zone);
}
/**
* Provides a noop implementation of `NgZone` which does nothing. This zone requires explicit calls
* to framework to perform rendering.
*/
export class NoopNgZone {
constructor() {
this.hasPendingMicrotasks = false;
this.hasPendingMacrotasks = false;
this.isStable = true;
this.onUnstable = new EventEmitter();
this.onMicrotaskEmpty = new EventEmitter();
this.onStable = new EventEmitter();
this.onError = new EventEmitter();
}
run(fn, applyThis, applyArgs) {
return fn.apply(applyThis, applyArgs);
}
runGuarded(fn, applyThis, applyArgs) {
return fn.apply(applyThis, applyArgs);
}
runOutsideAngular(fn) {
return fn();
}
runTask(fn, applyThis, applyArgs, name) {
return fn.apply(applyThis, applyArgs);
}
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {EventEmitter} from '../event_emitter';\nimport {global} from '../util/global';\nimport {noop} from '../util/noop';\nimport {getNativeRequestAnimationFrame} from '../util/raf';\n\n\n/**\n * An injectable service for executing work inside or outside of the Angular zone.\n *\n * The most common use of this service is to optimize performance when starting a work consisting of\n * one or more asynchronous tasks that don't require UI updates or error handling to be handled by\n * Angular. Such tasks can be kicked off via {@link #runOutsideAngular} and if needed, these tasks\n * can reenter the Angular zone via {@link #run}.\n *\n * <!-- TODO: add/fix links to:\n *   - docs explaining zones and the use of zones in Angular and change-detection\n *   - link to runOutsideAngular/run (throughout this file!)\n *   -->\n *\n * @usageNotes\n * ### Example\n *\n * ```\n * import {Component, NgZone} from '@angular/core';\n * import {NgIf} from '@angular/common';\n *\n * @Component({\n *   selector: 'ng-zone-demo',\n *   template: `\n *     <h2>Demo: NgZone</h2>\n *\n *     <p>Progress: {{progress}}%</p>\n *     <p *ngIf=\"progress >= 100\">Done processing {{label}} of Angular zone!</p>\n *\n *     <button (click)=\"processWithinAngularZone()\">Process within Angular zone</button>\n *     <button (click)=\"processOutsideOfAngularZone()\">Process outside of Angular zone</button>\n *   `,\n * })\n * export class NgZoneDemo {\n *   progress: number = 0;\n *   label: string;\n *\n *   constructor(private _ngZone: NgZone) {}\n *\n *   // Loop inside the Angular zone\n *   // so the UI DOES refresh after each setTimeout cycle\n *   processWithinAngularZone() {\n *     this.label = 'inside';\n *     this.progress = 0;\n *     this._increaseProgress(() => console.log('Inside Done!'));\n *   }\n *\n *   // Loop outside of the Angular zone\n *   // so the UI DOES NOT refresh after each setTimeout cycle\n *   processOutsideOfAngularZone() {\n *     this.label = 'outside';\n *     this.progress = 0;\n *     this._ngZone.runOutsideAngular(() => {\n *       this._increaseProgress(() => {\n *         // reenter the Angular zone and display done\n *         this._ngZone.run(() => { console.log('Outside Done!'); });\n *       });\n *     });\n *   }\n *\n *   _increaseProgress(doneCallback: () => void) {\n *     this.progress += 1;\n *     console.log(`Current progress: ${this.progress}%`);\n *\n *     if (this.progress < 100) {\n *       window.setTimeout(() => this._increaseProgress(doneCallback), 10);\n *     } else {\n *       doneCallback();\n *     }\n *   }\n * }\n * ```\n *\n * @publicApi\n */\nexport class NgZone {\n  readonly hasPendingMacrotasks: boolean = false;\n  readonly hasPendingMicrotasks: boolean = false;\n\n  /**\n   * Whether there are no outstanding microtasks or macrotasks.\n   */\n  readonly isStable: boolean = true;\n\n  /**\n   * Notifies when code enters Angular Zone. This gets fired first on VM Turn.\n   */\n  readonly onUnstable: EventEmitter<any> = new EventEmitter(false);\n\n  /**\n   * Notifies when there is no more microtasks enqueued in the current VM Turn.\n   * This is a hint for Angular to do change detection, which may enqueue more microtasks.\n   * For this reason this event can fire multiple times per VM Turn.\n   */\n  readonly onMicrotaskEmpty: EventEmitter<any> = new EventEmitter(false);\n\n  /**\n   * Notifies when the last `onMicrotaskEmpty` has run and there are no more microtasks, which\n   * implies we are about to relinquish VM turn.\n   * This event gets called just once.\n   */\n  readonly onStable: EventEmitter<any> = new EventEmitter(false);\n\n  /**\n   * Notifies that an error has been delivered.\n   */\n  readonly onError: EventEmitter<any> = new EventEmitter(false);\n\n\n  constructor({\n    enableLongStackTrace = false,\n    shouldCoalesceEventChangeDetection = false,\n    shouldCoalesceRunChangeDetection = false\n  }) {\n    if (typeof Zone == 'undefined') {\n      throw new Error(`In this configuration Angular requires Zone.js`);\n    }\n\n    Zone.assertZonePatched();\n    const self = this as any as NgZonePrivate;\n    self._nesting = 0;\n\n    self._outer = self._inner = Zone.current;\n\n    if ((Zone as any)['TaskTrackingZoneSpec']) {\n      self._inner = self._inner.fork(new ((Zone as any)['TaskTrackingZoneSpec'] as any));\n    }\n\n    if (enableLongStackTrace && (Zone as any)['longStackTraceZoneSpec']) {\n      self._inner = self._inner.fork((Zone as any)['longStackTraceZoneSpec']);\n    }\n    // if shouldCoalesceRunChangeDetection is true, all tasks including event tasks will be\n    // coalesced, so shouldCoalesceEventChangeDetection option is not necessary and can be skipped.\n    self.shouldCoalesceEventChangeDetection =\n        !shouldCoalesceRunChangeDetection && shouldCoalesceEventChangeDetection;\n    self.shouldCoalesceRunChangeDetection = shouldCoalesceRunChangeDetection;\n    self.lastRequestAnimationFrameId = -1;\n    self.nativeRequestAnimationFrame = getNativeRequestAnimationFrame().nativeRequestAnimationFrame;\n    forkInnerZoneWithAngularBehavior(self);\n  }\n\n  static isInAngularZone(): boolean {\n    return Zone.current.get('isAngularZone') === true;\n  }\n\n  static assertInAngularZone(): void {\n    if (!NgZone.isInAngularZone()) {\n      throw new Error('Expected to be in Angular Zone, but it is not!');\n    }\n  }\n\n  static assertNotInAngularZone(): void {\n    if (NgZone.isInAngularZone()) {\n      throw new Error('Expected to not be in Angular Zone, but it is!');\n    }\n  }\n\n  /**\n   * Executes the `fn` function synchronously within the Angular zone and returns value returned by\n   * the function.\n   *\n   * Running functions via `run` allows you to reenter Angular zone from a task that was executed\n   * outside of the Angular zone (typically started via {@link #runOutsideAngular}).\n   *\n   * Any future tasks or microtasks scheduled from within this function will continue executing from\n   * within the Angular zone.\n   *\n   * If a synchronous error happens it will be rethrown and not reported via `onError`.\n   */\n  run<T>(fn: (...args: any[]) => T, applyThis?: any, applyArgs?: any[]): T {\n    return (this as any as NgZonePrivate)._inner.run(fn, applyThis, applyArgs);\n  }\n\n  /**\n   * Executes the `fn` function synchronously within the Angular zone as a task and returns value\n   * returned by the function.\n   *\n   * Running functions via `run` allows you to reenter Angular zone from a task that was executed\n   * outside of the Angular zone (typically started via {@link #runOutsideAngular}).\n   *\n   * Any future tasks or microtasks scheduled from within this function will continue executing from\n   * within the Angular zone.\n   *\n   * If a synchronous error happens it will be rethrown and not reported via `onError`.\n   */\n  runTask<T>(fn: (...args: any[]) => T, applyThis?: any, applyArgs?: any[], name?: string): T {\n    const zone = (this as any as NgZonePrivate)._inner;\n    const task = zone.scheduleEventTask('NgZoneEvent: ' + name, fn, EMPTY_PAYLOAD, noop, noop);\n    try {\n      return zone.runTask(task, applyThis, applyArgs);\n    } finally {\n      zone.cancelTask(task);\n    }\n  }\n\n  /**\n   * Same as `run`, except that synchronous errors are caught and forwarded via `onError` and not\n   * rethrown.\n   */\n  runGuarded<T>(fn: (...args: any[]) => T, applyThis?: any, applyArgs?: any[]): T {\n    return (this as any as NgZonePrivate)._inner.runGuarded(fn, applyThis, applyArgs);\n  }\n\n  /**\n   * Executes the `fn` function synchronously in Angular's parent zone and returns value returned by\n   * the function.\n   *\n   * Running functions via {@link #runOutsideAngular} allows you to escape Angular's zone and do\n   * work that\n   * doesn't trigger Angular change-detection or is subject to Angular's error handling.\n   *\n   * Any future tasks or microtasks scheduled from within this function will continue executing from\n   * outside of the Angular zone.\n   *\n   * Use {@link #run} to reenter the Angular zone and do work that updates the application model.\n   */\n  runOutsideAngular<T>(fn: (...args: any[]) => T): T {\n    return (this as any as NgZonePrivate)._outer.run(fn);\n  }\n}\n\nconst EMPTY_PAYLOAD = {};\n\ninterface NgZonePrivate extends NgZone {\n  _outer: Zone;\n  _inner: Zone;\n  _nesting: number;\n  _hasPendingMicrotasks: boolean;\n\n  hasPendingMacrotasks: boolean;\n  hasPendingMicrotasks: boolean;\n  lastRequestAnimationFrameId: number;\n  /**\n   * A flag to indicate if NgZone is currently inside\n   * checkStable and to prevent re-entry. The flag is\n   * needed because it is possible to invoke the change\n   * detection from within change detection leading to\n   * incorrect behavior.\n   *\n   * For detail, please refer here,\n   * https://github.com/angular/angular/pull/40540\n   */\n  isCheckStableRunning: boolean;\n  isStable: boolean;\n  /**\n   * Optionally specify coalescing event change detections or not.\n   * Consider the following case.\n   *\n   * <div (click)=\"doSomething()\">\n   *   <button (click)=\"doSomethingElse()\"></button>\n   * </div>\n   *\n   * When button is clicked, because of the event bubbling, both\n   * event handlers will be called and 2 change detections will be\n   * triggered. We can coalesce such kind of events to trigger\n   * change detection only once.\n   *\n   * By default, this option will be false. So the events will not be\n   * coalesced and the change detection will be triggered multiple times.\n   * And if this option be set to true, the change detection will be\n   * triggered async by scheduling it in an animation frame. So in the case above,\n   * the change detection will only be trigged once.\n   */\n  shouldCoalesceEventChangeDetection: boolean;\n  /**\n   * Optionally specify if `NgZone#run()` method invocations should be coalesced\n   * into a single change detection.\n   *\n   * Consider the following case.\n   *\n   * for (let i = 0; i < 10; i ++) {\n   *   ngZone.run(() => {\n   *     // do something\n   *   });\n   * }\n   *\n   * This case triggers the change detection multiple times.\n   * With ngZoneRunCoalescing options, all change detections in an event loops trigger only once.\n   * In addition, the change detection executes in requestAnimation.\n   *\n   */\n  shouldCoalesceRunChangeDetection: boolean;\n\n  nativeRequestAnimationFrame: (callback: FrameRequestCallback) => number;\n\n  // Cache a  \"fake\" top eventTask so you don't need to schedule a new task every\n  // time you run a `checkStable`.\n  fakeTopEventTask: Task;\n}\n\nfunction checkStable(zone: NgZonePrivate) {\n  // TODO: @JiaLiPassion, should check zone.isCheckStableRunning to prevent\n  // re-entry. The case is:\n  //\n  // @Component({...})\n  // export class AppComponent {\n  // constructor(private ngZone: NgZone) {\n  //   this.ngZone.onStable.subscribe(() => {\n  //     this.ngZone.run(() => console.log('stable'););\n  //   });\n  // }\n  //\n  // The onStable subscriber run another function inside ngZone\n  // which causes `checkStable()` re-entry.\n  // But this fix causes some issues in g3, so this fix will be\n  // launched in another PR.\n  if (zone._nesting == 0 && !zone.hasPendingMicrotasks && !zone.isStable) {\n    try {\n      zone._nesting++;\n      zone.onMicrotaskEmpty.emit(null);\n    } finally {\n      zone._nesting--;\n      if (!zone.hasPendingMicrotasks) {\n        try {\n          zone.runOutsideAngular(() => zone.onStable.emit(null));\n        } finally {\n          zone.isStable = true;\n        }\n      }\n    }\n  }\n}\n\nfunction delayChangeDetectionForEvents(zone: NgZonePrivate) {\n  /**\n   * We also need to check _nesting here\n   * Consider the following case with shouldCoalesceRunChangeDetection = true\n   *\n   * ngZone.run(() => {});\n   * ngZone.run(() => {});\n   *\n   * We want the two `ngZone.run()` only trigger one change detection\n   * when shouldCoalesceRunChangeDetection is true.\n   * And because in this case, change detection run in async way(requestAnimationFrame),\n   * so we also need to check the _nesting here to prevent multiple\n   * change detections.\n   */\n  if (zone.isCheckStableRunning || zone.lastRequestAnimationFrameId !== -1) {\n    return;\n  }\n  zone.lastRequestAnimationFrameId = zone.nativeRequestAnimationFrame.call(global, () => {\n    // This is a work around for https://github.com/angular/angular/issues/36839.\n    // The core issue is that when event coalescing is enabled it is possible for microtasks\n    // to get flushed too early (As is the case with `Promise.then`) between the\n    // coalescing eventTasks.\n    //\n    // To workaround this we schedule a \"fake\" eventTask before we process the\n    // coalescing eventTasks. The benefit of this is that the \"fake\" container eventTask\n    //  will prevent the microtasks queue from getting drained in between the coalescing\n    // eventTask execution.\n    if (!zone.fakeTopEventTask) {\n      zone.fakeTopEventTask = Zone.root.scheduleEventTask('fakeTopEventTask', () => {\n        zone.lastRequestAnimationFrameId = -1;\n        updateMicroTaskStatus(zone);\n        zone.isCheckStableRunning = true;\n        checkStable(zone);\n        zone.isCheckStableRunning = false;\n      }, undefined, () => {}, () => {});\n    }\n    zone.fakeTopEventTask.invoke();\n  });\n  updateMicroTaskStatus(zone);\n}\n\nfunction forkInnerZoneWithAngularBehavior(zone: NgZonePrivate) {\n  const delayChangeDetectionForEventsDelegate = () => {\n    delayChangeDetectionForEvents(zone);\n  };\n  zone._inner = zone._inner.fork({\n    name: 'angular',\n    properties: <any>{'isAngularZone': true},\n    onInvokeTask:\n        (delegate: ZoneDelegate, current: Zone, target: Zone, task: Task, applyThis: any,\n         applyArgs: any): any => {\n          try {\n            onEnter(zone);\n            return delegate.invokeTask(target, task, applyThis, applyArgs);\n          } finally {\n            if ((zone.shouldCoalesceEventChangeDetection && task.type === 'eventTask') ||\n                zone.shouldCoalesceRunChangeDetection) {\n              delayChangeDetectionForEventsDelegate();\n            }\n            onLeave(zone);\n          }\n        },\n\n    onInvoke:\n        (delegate: ZoneDelegate, current: Zone, target: Zone, callback: Function, applyThis: any,\n         applyArgs?: any[], source?: string): any => {\n          try {\n            onEnter(zone);\n            return delegate.invoke(target, callback, applyThis, applyArgs, source);\n          } finally {\n            if (zone.shouldCoalesceRunChangeDetection) {\n              delayChangeDetectionForEventsDelegate();\n            }\n            onLeave(zone);\n          }\n        },\n\n    onHasTask:\n        (delegate: ZoneDelegate, current: Zone, target: Zone, hasTaskState: HasTaskState) => {\n          delegate.hasTask(target, hasTaskState);\n          if (current === target) {\n            // We are only interested in hasTask events which originate from our zone\n            // (A child hasTask event is not interesting to us)\n            if (hasTaskState.change == 'microTask') {\n              zone._hasPendingMicrotasks = hasTaskState.microTask;\n              updateMicroTaskStatus(zone);\n              checkStable(zone);\n            } else if (hasTaskState.change == 'macroTask') {\n              zone.hasPendingMacrotasks = hasTaskState.macroTask;\n            }\n          }\n        },\n\n    onHandleError: (delegate: ZoneDelegate, current: Zone, target: Zone, error: any): boolean => {\n      delegate.handleError(target, error);\n      zone.runOutsideAngular(() => zone.onError.emit(error));\n      return false;\n    }\n  });\n}\n\nfunction updateMicroTaskStatus(zone: NgZonePrivate) {\n  if (zone._hasPendingMicrotasks ||\n      ((zone.shouldCoalesceEventChangeDetection || zone.shouldCoalesceRunChangeDetection) &&\n       zone.lastRequestAnimationFrameId !== -1)) {\n    zone.hasPendingMicrotasks = true;\n  } else {\n    zone.hasPendingMicrotasks = false;\n  }\n}\n\nfunction onEnter(zone: NgZonePrivate) {\n  zone._nesting++;\n  if (zone.isStable) {\n    zone.isStable = false;\n    zone.onUnstable.emit(null);\n  }\n}\n\nfunction onLeave(zone: NgZonePrivate) {\n  zone._nesting--;\n  checkStable(zone);\n}\n\n/**\n * Provides a noop implementation of `NgZone` which does nothing. This zone requires explicit calls\n * to framework to perform rendering.\n */\nexport class NoopNgZone implements NgZone {\n  readonly hasPendingMicrotasks: boolean = false;\n  readonly hasPendingMacrotasks: boolean = false;\n  readonly isStable: boolean = true;\n  readonly onUnstable: EventEmitter<any> = new EventEmitter();\n  readonly onMicrotaskEmpty: EventEmitter<any> = new EventEmitter();\n  readonly onStable: EventEmitter<any> = new EventEmitter();\n  readonly onError: EventEmitter<any> = new EventEmitter();\n\n  run<T>(fn: (...args: any[]) => T, applyThis?: any, applyArgs?: any): T {\n    return fn.apply(applyThis, applyArgs);\n  }\n\n  runGuarded<T>(fn: (...args: any[]) => any, applyThis?: any, applyArgs?: any): T {\n    return fn.apply(applyThis, applyArgs);\n  }\n\n  runOutsideAngular<T>(fn: (...args: any[]) => T): T {\n    return fn();\n  }\n\n  runTask<T>(fn: (...args: any[]) => T, applyThis?: any, applyArgs?: any, name?: string): T {\n    return fn.apply(applyThis, applyArgs);\n  }\n}\n"]}