text: 'use strict';
  /**
   * @license Angular v12.0.0-next.0
   * (c) 2010-2020 Google LLC. https://angular.io/
   * License: MIT
   */
  /**
   * @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
   */
  /**
   * @fileoverview
   * @suppress {globalThis}
   */
  const NEWLINE = '\n';
  const IGNORE_FRAMES = {};
  const creationTrace = '__creationTrace__';
  const ERROR_TAG = 'STACKTRACE TRACKING';
  const SEP_TAG = '__SEP_TAG__';
  let sepTemplate = SEP_TAG + '@[native]';
  class LongStackTrace {
      constructor() {
          this.error = getStacktrace();
          this.timestamp = new Date();
      }
  }
  function getStacktraceWithUncaughtError() {
      return new Error(ERROR_TAG);
  }
  function getStacktraceWithCaughtError() {
      try {
          throw getStacktraceWithUncaughtError();
      }
      catch (err) {
          return err;
      }
  }
  // Some implementations of exception handling don't create a stack trace if the exception
  // isn't thrown, however it's faster not to actually throw the exception.
  const error = getStacktraceWithUncaughtError();
  const caughtError = getStacktraceWithCaughtError();
  const getStacktrace = error.stack ?
      getStacktraceWithUncaughtError :
      (caughtError.stack ? getStacktraceWithCaughtError : getStacktraceWithUncaughtError);
  function getFrames(error) {
      return error.stack ? error.stack.split(NEWLINE) : [];
  }
  function addErrorStack(lines, error) {
      let trace = getFrames(error);
      for (let i = 0; i < trace.length; i++) {
          const frame = trace[i];
          // Filter out the Frames which are part of stack capturing.
          if (!IGNORE_FRAMES.hasOwnProperty(frame)) {
              lines.push(trace[i]);
          }
      }
  }
  function renderLongStackTrace(frames, stack) {
      const longTrace = [stack ? stack.trim() : ''];
      if (frames) {
          let timestamp = new Date().getTime();
          for (let i = 0; i < frames.length; i++) {
              const traceFrames = frames[i];
              const lastTime = traceFrames.timestamp;
              let separator = `____________________Elapsed ${timestamp - lastTime.getTime()} ms; At: ${lastTime}`;
              separator = separator.replace(/[^\w\d]/g, '_');
              longTrace.push(sepTemplate.replace(SEP_TAG, separator));
              addErrorStack(longTrace, traceFrames.error);
              timestamp = lastTime.getTime();
          }
      }
      return longTrace.join(NEWLINE);
  }
  // if Error.stackTraceLimit is 0, means stack trace
  // is disabled, so we don't need to generate long stack trace
  // this will improve performance in some test(some test will
  // set stackTraceLimit to 0, https://github.com/angular/zone.js/issues/698
  function stackTracesEnabled() {
      // Cast through any since this property only exists on Error in the nodejs
      // typings.
      return Error.stackTraceLimit > 0;
  }
  Zone['longStackTraceZoneSpec'] = {
      name: 'long-stack-trace',
      longStackTraceLimit: 10,
      // add a getLongStackTrace method in spec to
      // handle handled reject promise error.
      getLongStackTrace: function (error) {
          if (!error) {
              return undefined;
          }
          const trace = error[Zone.__symbol__('currentTaskTrace')];
          if (!trace) {
              return error.stack;
          }
          return renderLongStackTrace(trace, error.stack);
      },
      onScheduleTask: function (parentZoneDelegate, currentZone, targetZone, task) {
          if (stackTracesEnabled()) {
              const currentTask = Zone.currentTask;
              let trace = currentTask && currentTask.data && currentTask.data[creationTrace] || [];
              trace = [new LongStackTrace()].concat(trace);
              if (trace.length > this.longStackTraceLimit) {
                  trace.length = this.longStackTraceLimit;
              }
              if (!task.data)
                  task.data = {};
              if (task.type === 'eventTask') {
                  // Fix issue https://github.com/angular/zone.js/issues/1195,
                  // For event task of browser, by default, all task will share a
                  // singleton instance of data object, we should create a new one here
                  // The cast to `any` is required to workaround a closure bug which wrongly applies
                  // URL sanitization rules to .data access.
                  task.data = Object.assign({}, task.data);
              }
              task.data[creationTrace] = trace;
          }
          return parentZoneDelegate.scheduleTask(targetZone, task);
      },
      onHandleError: function (parentZoneDelegate, currentZone, targetZone, error) {
          if (stackTracesEnabled()) {
              const parentTask = Zone.currentTask || error.task;
              if (error instanceof Error && parentTask) {
                  const longStack = renderLongStackTrace(parentTask.data && parentTask.data[creationTrace], error.stack);
                  try {
                      error.stack = error.longStack = longStack;
                  }
                  catch (err) {
                  }
              }
          }
          return parentZoneDelegate.handleError(targetZone, error);
      }
  };
  function captureStackTraces(stackTraces, count) {
      if (count > 0) {
          stackTraces.push(getFrames((new LongStackTrace()).error));
          captureStackTraces(stackTraces, count - 1);
      }
  }
  function computeIgnoreFrames() {
      if (!stackTracesEnabled()) {
          return;
      }
      const frames = [];
      captureStackTraces(frames, 2);
      const frames1 = frames[0];
      const frames2 = frames[1];
      for (let i = 0; i < frames1.length; i++) {
          const frame1 = frames1[i];
          if (frame1.indexOf(ERROR_TAG) == -1) {
              let match = frame1.match(/^\s*at\s+/);
              if (match) {
                  sepTemplate = match[0] + SEP_TAG + ' (http://localhost)';
                  break;
              }
          }
      }
      for (let i = 0; i < frames1.length; i++) {
          const frame1 = frames1[i];
          const frame2 = frames2[i];
          if (frame1 === frame2) {
              IGNORE_FRAMES[frame1] = true;
          }
          else {
              break;
          }
      }
  }
  computeIgnoreFrames();
  
  /**
   * @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
   */
  class ProxyZoneSpec {
      constructor(defaultSpecDelegate = null) {
          this.defaultSpecDelegate = defaultSpecDelegate;
          this.name = 'ProxyZone';
          this._delegateSpec = null;
          this.properties = { 'ProxyZoneSpec': this };
          this.propertyKeys = null;
          this.lastTaskState = null;
          this.isNeedToTriggerHasTask = false;
          this.tasks = [];
          this.setDelegate(defaultSpecDelegate);
      }
      static get() {
          return Zone.current.get('ProxyZoneSpec');
      }
      static isLoaded() {
          return ProxyZoneSpec.get() instanceof ProxyZoneSpec;
      }
      static assertPresent() {
          if (!ProxyZoneSpec.isLoaded()) {
              throw new Error(`Expected to be running in 'ProxyZone', but it was not found.`);
          }
          return ProxyZoneSpec.get();
      }
      setDelegate(delegateSpec) {
          const isNewDelegate = this._delegateSpec !== delegateSpec;
          this._delegateSpec = delegateSpec;
          this.propertyKeys && this.propertyKeys.forEach((key) => delete this.properties[key]);
          this.propertyKeys = null;
          if (delegateSpec && delegateSpec.properties) {
              this.propertyKeys = Object.keys(delegateSpec.properties);
              this.propertyKeys.forEach((k) => this.properties[k] = delegateSpec.properties[k]);
          }
          // if a new delegateSpec was set, check if we need to trigger hasTask
          if (isNewDelegate && this.lastTaskState &&
              (this.lastTaskState.macroTask || this.lastTaskState.microTask)) {
              this.isNeedToTriggerHasTask = true;
          }
      }
      getDelegate() {
          return this._delegateSpec;
      }
      resetDelegate() {
          const delegateSpec = this.getDelegate();
          this.setDelegate(this.defaultSpecDelegate);
      }
      tryTriggerHasTask(parentZoneDelegate, currentZone, targetZone) {
          if (this.isNeedToTriggerHasTask && this.lastTaskState) {
              // last delegateSpec has microTask or macroTask
              // should call onHasTask in current delegateSpec
              this.isNeedToTriggerHasTask = false;
              this.onHasTask(parentZoneDelegate, currentZone, targetZone, this.lastTaskState);
          }
      }
      removeFromTasks(task) {
          if (!this.tasks) {
              return;
          }
          for (let i = 0; i < this.tasks.length; i++) {
              if (this.tasks[i] === task) {
                  this.tasks.splice(i, 1);
                  return;
              }
          }
      }
      getAndClearPendingTasksInfo() {
          if (this.tasks.length === 0) {
              return '';
          }
          const taskInfo = this.tasks.map((task) => {
              const dataInfo = task.data &&
                  Object.keys(task.data)
                      .map((key) => {
                      return key + ':' + task.data[key];
                  })
                      .join(',');
              return `type: ${task.type}, source: ${task.source}, args: {${dataInfo}}`;
          });
          const pendingTasksInfo = '--Pending async tasks are: [' + taskInfo + ']';
          // clear tasks
          this.tasks = [];
          return pendingTasksInfo;
      }
      onFork(parentZoneDelegate, currentZone, targetZone, zoneSpec) {
          if (this._delegateSpec && this._delegateSpec.onFork) {
              return this._delegateSpec.onFork(parentZoneDelegate, currentZone, targetZone, zoneSpec);
          }
          else {
              return parentZoneDelegate.fork(targetZone, zoneSpec);
          }
      }
      onIntercept(parentZoneDelegate, currentZone, targetZone, delegate, source) {
          if (this._delegateSpec && this._delegateSpec.onIntercept) {
              return this._delegateSpec.onIntercept(parentZoneDelegate, currentZone, targetZone, delegate, source);
          }
          else {
              return parentZoneDelegate.intercept(targetZone, delegate, source);
          }
      }
      onInvoke(parentZoneDelegate, currentZone, targetZone, delegate, applyThis, applyArgs, source) {
          this.tryTriggerHasTask(parentZoneDelegate, currentZone, targetZone);
          if (this._delegateSpec && this._delegateSpec.onInvoke) {
              return this._delegateSpec.onInvoke(parentZoneDelegate, currentZone, targetZone, delegate, applyThis, applyArgs, source);
          }
          else {
              return parentZoneDelegate.invoke(targetZone, delegate, applyThis, applyArgs, source);
          }
      }
      onHandleError(parentZoneDelegate, currentZone, targetZone, error) {
          if (this._delegateSpec && this._delegateSpec.onHandleError) {
              return this._delegateSpec.onHandleError(parentZoneDelegate, currentZone, targetZone, error);
          }
          else {
              return parentZoneDelegate.handleError(targetZone, error);
          }
      }
      onScheduleTask(parentZoneDelegate, currentZone, targetZone, task) {
          if (task.type !== 'eventTask') {
              this.tasks.push(task);
          }
          if (this._delegateSpec && this._delegateSpec.onScheduleTask) {
              return this._delegateSpec.onScheduleTask(parentZoneDelegate, currentZone, targetZone, task);
          }
          else {
              return parentZoneDelegate.scheduleTask(targetZone, task);
          }
      }
      onInvokeTask(parentZoneDelegate, currentZone, targetZone, task, applyThis, applyArgs) {
          if (task.type !== 'eventTask') {
              this.removeFromTasks(task);
          }
          this.tryTriggerHasTask(parentZoneDelegate, currentZone, targetZone);
          if (this._delegateSpec && this._delegateSpec.onInvokeTask) {
              return this._delegateSpec.onInvokeTask(parentZoneDelegate, currentZone, targetZone, task, applyThis, applyArgs);
          }
          else {
              return parentZoneDelegate.invokeTask(targetZone, task, applyThis, applyArgs);
          }
      }
      onCancelTask(parentZoneDelegate, currentZone, targetZone, task) {
          if (task.type !== 'eventTask') {
              this.removeFromTasks(task);
          }
          this.tryTriggerHasTask(parentZoneDelegate, currentZone, targetZone);
          if (this._delegateSpec && this._delegateSpec.onCancelTask) {
              return this._delegateSpec.onCancelTask(parentZoneDelegate, currentZone, targetZone, task);
          }
          else {
              return parentZoneDelegate.cancelTask(targetZone, task);
          }
      }
      onHasTask(delegate, current, target, hasTaskState) {
          this.lastTaskState = hasTaskState;
          if (this._delegateSpec && this._delegateSpec.onHasTask) {
              this._delegateSpec.onHasTask(delegate, current, target, hasTaskState);
          }
          else {
              delegate.hasTask(target, hasTaskState);
          }
      }
  }
  // Export the class so that new instances can be created with proper
  // constructor params.
  Zone['ProxyZoneSpec'] = ProxyZoneSpec;
  
  /**
   * @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
   */
  class SyncTestZoneSpec {
      constructor(namePrefix) {
          this.runZone = Zone.current;
          this.name = 'syncTestZone for ' + namePrefix;
      }
      onScheduleTask(delegate, current, target, 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['SyncTestZoneSpec'] = SyncTestZoneSpec;
  
  /**
   * @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
   */
  Zone.__load_patch('jasmine', (global, Zone, api) => {
      const __extends = function (d, b) {
          for (const p in b)
              if (b.hasOwnProperty(p))
                  d[p] = b[p];
          function __() {
              this.constructor = d;
          }
          d.prototype = b === null ? Object.create(b) : ((__.prototype = b.prototype), new __());
      };
      // Patch jasmine's describe/it/beforeEach/afterEach functions so test code always runs
      // in a testZone (ProxyZone). (See: angular/zone.js#91 & angular/angular#10503)
      if (!Zone)
          throw new Error('Missing: zone.js');
      if (typeof jest !== 'undefined') {
          // return if jasmine is a light implementation inside jest
          // in this case, we are running inside jest not jasmine
          return;
      }
      if (typeof jasmine == 'undefined' || jasmine['__zone_patch__']) {
          return;
      }
      jasmine['__zone_patch__'] = true;
      const SyncTestZoneSpec = Zone['SyncTestZoneSpec'];
      const ProxyZoneSpec = Zone['ProxyZoneSpec'];
      if (!SyncTestZoneSpec)
          throw new Error('Missing: SyncTestZoneSpec');
      if (!ProxyZoneSpec)
          throw new Error('Missing: ProxyZoneSpec');
      const ambientZone = Zone.current;
      // Create a synchronous-only zone in which to run `describe` blocks in order to raise an
      // error if any asynchronous operations are attempted inside of a `describe` but outside of
      // a `beforeEach` or `it`.
      const syncZone = ambientZone.fork(new SyncTestZoneSpec('jasmine.describe'));
      const symbol = Zone.__symbol__;
      // whether patch jasmine clock when in fakeAsync
      const disablePatchingJasmineClock = global[symbol('fakeAsyncDisablePatchingClock')] === true;
      // the original variable name fakeAsyncPatchLock is not accurate, so the name will be
      // fakeAsyncAutoFakeAsyncWhenClockPatched and if this enablePatchingJasmineClock is false, we also
      // automatically disable the auto jump into fakeAsync feature
      const enableAutoFakeAsyncWhenClockPatched = !disablePatchingJasmineClock &&
          ((global[symbol('fakeAsyncPatchLock')] === true) ||
              (global[symbol('fakeAsyncAutoFakeAsyncWhenClockPatched')] === true));
      const ignoreUnhandledRejection = global[symbol('ignoreUnhandledRejection')] === true;
      if (!ignoreUnhandledRejection) {
          const globalErrors = jasmine.GlobalErrors;
          if (globalErrors && !jasmine[symbol('GlobalErrors')]) {
              jasmine[symbol('GlobalErrors')] = globalErrors;
              jasmine.GlobalErrors = function () {
                  const instance = new globalErrors();
                  const originalInstall = instance.install;
                  if (originalInstall && !instance[symbol('install')]) {
                      instance[symbol('install')] = originalInstall;
                      instance.install = function () {
                          const originalHandlers = process.listeners('unhandledRejection');
                          const r = originalInstall.apply(this, arguments);
                          process.removeAllListeners('unhandledRejection');
                          if (originalHandlers) {
                              originalHandlers.forEach(h => process.on('unhandledRejection', h));
                          }
                          return r;
                      };
                  }
                  return instance;
              };
          }
      }
      // Monkey patch all of the jasmine DSL so that each function runs in appropriate zone.
      const jasmineEnv = jasmine.getEnv();
      ['describe', 'xdescribe', 'fdescribe'].forEach(methodName => {
          let originalJasmineFn = jasmineEnv[methodName];
          jasmineEnv[methodName] = function (description, specDefinitions) {
              return originalJasmineFn.call(this, description, wrapDescribeInZone(specDefinitions));
          };
      });
      ['it', 'xit', 'fit'].forEach(methodName => {
          let originalJasmineFn = jasmineEnv[methodName];
          jasmineEnv[symbol(methodName)] = originalJasmineFn;
          jasmineEnv[methodName] = function (description, specDefinitions, timeout) {
              arguments[1] = wrapTestInZone(specDefinitions);
              return originalJasmineFn.apply(this, arguments);
          };
      });
      ['beforeEach', 'afterEach', 'beforeAll', 'afterAll'].forEach(methodName => {
          let originalJasmineFn = jasmineEnv[methodName];
          jasmineEnv[symbol(methodName)] = originalJasmineFn;
          jasmineEnv[methodName] = function (specDefinitions, timeout) {
              arguments[0] = wrapTestInZone(specDefinitions);
              return originalJasmineFn.apply(this, arguments);
          };
      });
      if (!disablePatchingJasmineClock) {
          // need to patch jasmine.clock().mockDate and jasmine.clock().tick() so
          // they can work properly in FakeAsyncTest
          const originalClockFn = (jasmine[symbol('clock')] = jasmine['clock']);
          jasmine['clock'] = function () {
              const clock = originalClockFn.apply(this, arguments);
              if (!clock[symbol('patched')]) {
                  clock[symbol('patched')] = symbol('patched');
                  const originalTick = (clock[symbol('tick')] = clock.tick);
                  clock.tick = function () {
                      const fakeAsyncZoneSpec = Zone.current.get('FakeAsyncTestZoneSpec');
                      if (fakeAsyncZoneSpec) {
                          return fakeAsyncZoneSpec.tick.apply(fakeAsyncZoneSpec, arguments);
                      }
                      return originalTick.apply(this, arguments);
                  };
                  const originalMockDate = (clock[symbol('mockDate')] = clock.mockDate);
                  clock.mockDate = function () {
                      const fakeAsyncZoneSpec = Zone.current.get('FakeAsyncTestZoneSpec');
                      if (fakeAsyncZoneSpec) {
                          const dateTime = arguments.length > 0 ? arguments[0] : new Date();
                          return fakeAsyncZoneSpec.setFakeBaseSystemTime.apply(fakeAsyncZoneSpec, dateTime && typeof dateTime.getTime === 'function' ? [dateTime.getTime()] :
                              arguments);
                      }
                      return originalMockDate.apply(this, arguments);
                  };
                  // for auto go into fakeAsync feature, we need the flag to enable it
                  if (enableAutoFakeAsyncWhenClockPatched) {
                      ['install', 'uninstall'].forEach(methodName => {
                          const originalClockFn = (clock[symbol(methodName)] = clock[methodName]);
                          clock[methodName] = function () {
                              const FakeAsyncTestZoneSpec = Zone['FakeAsyncTestZoneSpec'];
                              if (FakeAsyncTestZoneSpec) {
                                  jasmine[symbol('clockInstalled')] = 'install' === methodName;
                                  return;
                              }
                              return originalClockFn.apply(this, arguments);
                          };
                      });
                  }
              }
              return clock;
          };
      }
      // monkey patch createSpyObj to make properties enumerable to true
      if (!jasmine[Zone.__symbol__('createSpyObj')]) {
          const originalCreateSpyObj = jasmine.createSpyObj;
          jasmine[Zone.__symbol__('createSpyObj')] = originalCreateSpyObj;
          jasmine.createSpyObj = function () {
              const args = Array.prototype.slice.call(arguments);
              const propertyNames = args.length >= 3 ? args[2] : null;
              let spyObj;
              if (propertyNames) {
                  const defineProperty = Object.defineProperty;
                  Object.defineProperty = function (obj, p, attributes) {
                      return defineProperty.call(this, obj, p, Object.assign(Object.assign({}, attributes), { configurable: true, enumerable: true }));
                  };
                  try {
                      spyObj = originalCreateSpyObj.apply(this, args);
                  }
                  finally {
                      Object.defineProperty = defineProperty;
                  }
              }
              else {
                  spyObj = originalCreateSpyObj.apply(this, args);
              }
              return spyObj;
          };
      }
      /**
       * Gets a function wrapping the body of a Jasmine `describe` block to execute in a
       * synchronous-only zone.
       */
      function wrapDescribeInZone(describeBody) {
          return function () {
              return syncZone.run(describeBody, this, arguments);
          };
      }
      function runInTestZone(testBody, applyThis, queueRunner, done) {
          const isClockInstalled = !!jasmine[symbol('clockInstalled')];
          const testProxyZoneSpec = queueRunner.testProxyZoneSpec;
          const testProxyZone = queueRunner.testProxyZone;
          if (isClockInstalled && enableAutoFakeAsyncWhenClockPatched) {
              // auto run a fakeAsync
              const fakeAsyncModule = Zone[Zone.__symbol__('fakeAsyncTest')];
              if (fakeAsyncModule && typeof fakeAsyncModule.fakeAsync === 'function') {
                  testBody = fakeAsyncModule.fakeAsync(testBody);
              }
          }
          if (done) {
              return testProxyZone.run(testBody, applyThis, [done]);
          }
          else {
              return testProxyZone.run(testBody, applyThis);
          }
      }
      /**
       * Gets a function wrapping the body of a Jasmine `it/beforeEach/afterEach` block to
       * execute in a ProxyZone zone.
       * This will run in `testProxyZone`. The `testProxyZone` will be reset by the `ZoneQueueRunner`
       */
      function wrapTestInZone(testBody) {
          // The `done` callback is only passed through if the function expects at least one argument.
          // Note we have to make a function with correct number of arguments, otherwise jasmine will
          // think that all functions are sync or async.
          return (testBody && (testBody.length ? function (done) {
              return runInTestZone(testBody, this, this.queueRunner, done);
          } : function () {
              return runInTestZone(testBody, this, this.queueRunner);
          }));
      }
      const QueueRunner = jasmine.QueueRunner;
      jasmine.QueueRunner = (function (_super) {
          __extends(ZoneQueueRunner, _super);
          function ZoneQueueRunner(attrs) {
              if (attrs.onComplete) {
                  attrs.onComplete = (fn => () => {
                      // All functions are done, clear the test zone.
                      this.testProxyZone = null;
                      this.testProxyZoneSpec = null;
                      ambientZone.scheduleMicroTask('jasmine.onComplete', fn);
                  })(attrs.onComplete);
              }
              const nativeSetTimeout = global[Zone.__symbol__('setTimeout')];
              const nativeClearTimeout = global[Zone.__symbol__('clearTimeout')];
              if (nativeSetTimeout) {
                  // should run setTimeout inside jasmine outside of zone
                  attrs.timeout = {
                      setTimeout: nativeSetTimeout ? nativeSetTimeout : global.setTimeout,
                      clearTimeout: nativeClearTimeout ? nativeClearTimeout : global.clearTimeout
                  };
              }
              // create a userContext to hold the queueRunner itself
              // so we can access the testProxy in it/xit/beforeEach ...
              if (jasmine.UserContext) {
                  if (!attrs.userContext) {
                      attrs.userContext = new jasmine.UserContext();
                  }
                  attrs.userContext.queueRunner = this;
              }
              else {
                  if (!attrs.userContext) {
                      attrs.userContext = {};
                  }
                  attrs.userContext.queueRunner = this;
              }
              // patch attrs.onException
              const onException = attrs.onException;
              attrs.onException = function (error) {
                  if (error &&
                      error.message ===
                          'Timeout - Async callback was not invoked within timeout specified by jasmine.DEFAULT_TIMEOUT_INTERVAL.') {
                      // jasmine timeout, we can make the error message more
                      // reasonable to tell what tasks are pending
                      const proxyZoneSpec = this && this.testProxyZoneSpec;
                      if (proxyZoneSpec) {
                          const pendingTasksInfo = proxyZoneSpec.getAndClearPendingTasksInfo();
                          try {
                              // try catch here in case error.message is not writable
                              error.message += pendingTasksInfo;
                          }
                          catch (err) {
                          }
                      }
                  }
                  if (onException) {
                      onException.call(this, error);
                  }
              };
              _super.call(this, attrs);
          }
          ZoneQueueRunner.prototype.execute = function () {
              let zone = Zone.current;
              let isChildOfAmbientZone = false;
              while (zone) {
                  if (zone === ambientZone) {
                      isChildOfAmbientZone = true;
                      break;
                  }
                  zone = zone.parent;
              }
              if (!isChildOfAmbientZone)
                  throw new Error('Unexpected Zone: ' + Zone.current.name);
              // This is the zone which will be used for running individual tests.
              // It will be a proxy zone, so that the tests function can retroactively install
              // different zones.
              // Example:
              //   - In beforeEach() do childZone = Zone.current.fork(...);
              //   - In it() try to do fakeAsync(). The issue is that because the beforeEach forked the
              //     zone outside of fakeAsync it will be able to escape the fakeAsync rules.
              //   - Because ProxyZone is parent fo `childZone` fakeAsync can retroactively add
              //     fakeAsync behavior to the childZone.
              this.testProxyZoneSpec = new ProxyZoneSpec();
              this.testProxyZone = ambientZone.fork(this.testProxyZoneSpec);
              if (!Zone.currentTask) {
                  // if we are not running in a task then if someone would register a
                  // element.addEventListener and then calling element.click() the
                  // addEventListener callback would think that it is the top most task and would
                  // drain the microtask queue on element.click() which would be incorrect.
                  // For this reason we always force a task when running jasmine tests.
                  Zone.current.scheduleMicroTask('jasmine.execute().forceTask', () => QueueRunner.prototype.execute.call(this));
              }
              else {
                  _super.prototype.execute.call(this);
              }
          };
          return ZoneQueueRunner;
      })(QueueRunner);
  });
  
  /**
   * @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
   */
  Zone.__load_patch('jest', (context, Zone, api) => {
      if (typeof jest === 'undefined' || jest['__zone_patch__']) {
          return;
      }
      jest['__zone_patch__'] = true;
      const ProxyZoneSpec = Zone['ProxyZoneSpec'];
      const SyncTestZoneSpec = Zone['SyncTestZoneSpec'];
      if (!ProxyZoneSpec) {
          throw new Error('Missing ProxyZoneSpec');
      }
      const rootZone = Zone.current;
      const syncZone = rootZone.fork(new SyncTestZoneSpec('jest.describe'));
      const proxyZoneSpec = new ProxyZoneSpec();
      const proxyZone = rootZone.fork(proxyZoneSpec);
      function wrapDescribeFactoryInZone(originalJestFn) {
          return function (...tableArgs) {
              const originalDescribeFn = originalJestFn.apply(this, tableArgs);
              return function (...args) {
                  args[1] = wrapDescribeInZone(args[1]);
                  return originalDescribeFn.apply(this, args);
              };
          };
      }
      function wrapTestFactoryInZone(originalJestFn) {
          return function (...tableArgs) {
              return function (...args) {
                  args[1] = wrapTestInZone(args[1]);
                  return originalJestFn.apply(this, tableArgs).apply(this, args);
              };
          };
      }
      /**
       * Gets a function wrapping the body of a jest `describe` block to execute in a
       * synchronous-only zone.
       */
      function wrapDescribeInZone(describeBody) {
          return function (...args) {
              return syncZone.run(describeBody, this, args);
          };
      }
      /**
       * Gets a function wrapping the body of a jest `it/beforeEach/afterEach` block to
       * execute in a ProxyZone zone.
       * This will run in the `proxyZone`.
       */
      function wrapTestInZone(testBody, isTestFunc = false) {
          if (typeof testBody !== 'function') {
              return testBody;
          }
          const wrappedFunc = function () {
              if (Zone[api.symbol('useFakeTimersCalled')] === true && testBody &&
                  !testBody.isFakeAsync) {
                  // jest.useFakeTimers is called, run into fakeAsyncTest automatically.
                  const fakeAsyncModule = Zone[Zone.__symbol__('fakeAsyncTest')];
                  if (fakeAsyncModule && typeof fakeAsyncModule.fakeAsync === 'function') {
                      testBody = fakeAsyncModule.fakeAsync(testBody);
                  }
              }
              proxyZoneSpec.isTestFunc = isTestFunc;
              return proxyZone.run(testBody, null, arguments);
          };
          // Update the length of wrappedFunc to be the same as the length of the testBody
          // So jest core can handle whether the test function has `done()` or not correctly
          Object.defineProperty(wrappedFunc, 'length', { configurable: true, writable: true, enumerable: false });
          wrappedFunc.length = testBody.length;
          return wrappedFunc;
      }
      ['describe', 'xdescribe', 'fdescribe'].forEach(methodName => {
          let originalJestFn = context[methodName];
          if (context[Zone.__symbol__(methodName)]) {
              return;
          }
          context[Zone.__symbol__(methodName)] = originalJestFn;
          context[methodName] = function (...args) {
              args[1] = wrapDescribeInZone(args[1]);
              return originalJestFn.apply(this, args);
          };
          context[methodName].each = wrapDescribeFactoryInZone(originalJestFn.each);
      });
      context.describe.only = context.fdescribe;
      context.describe.skip = context.xdescribe;
      ['it', 'xit', 'fit', 'test', 'xtest'].forEach(methodName => {
          let originalJestFn = context[methodName];
          if (context[Zone.__symbol__(methodName)]) {
              return;
          }
          context[Zone.__symbol__(methodName)] = originalJestFn;
          context[methodName] = function (...args) {
              args[1] = wrapTestInZone(args[1], true);
              return originalJestFn.apply(this, args);
          };
          context[methodName].each = wrapTestFactoryInZone(originalJestFn.each);
          context[methodName].todo = originalJestFn.todo;
      });
      context.it.only = context.fit;
      context.it.skip = context.xit;
      context.test.only = context.fit;
      context.test.skip = context.xit;
      ['beforeEach', 'afterEach', 'beforeAll', 'afterAll'].forEach(methodName => {
          let originalJestFn = context[methodName];
          if (context[Zone.__symbol__(methodName)]) {
              return;
          }
          context[Zone.__symbol__(methodName)] = originalJestFn;
          context[methodName] = function (...args) {
              args[0] = wrapTestInZone(args[0]);
              return originalJestFn.apply(this, args);
          };
      });
      Zone.patchJestObject = function patchJestObject(Timer, isModern = false) {
          // check whether currently the test is inside fakeAsync()
          function isPatchingFakeTimer() {
              const fakeAsyncZoneSpec = Zone.current.get('FakeAsyncTestZoneSpec');
              return !!fakeAsyncZoneSpec;
          }
          // check whether the current function is inside `test/it` or other methods
          // such as `describe/beforeEach`
          function isInTestFunc() {
              const proxyZoneSpec = Zone.current.get('ProxyZoneSpec');
              return proxyZoneSpec && proxyZoneSpec.isTestFunc;
          }
          if (Timer[api.symbol('fakeTimers')]) {
              return;
          }
          Timer[api.symbol('fakeTimers')] = true;
          // patch jest fakeTimer internal method to make sure no console.warn print out
          api.patchMethod(Timer, '_checkFakeTimers', delegate => {
              return function (self, args) {
                  if (isPatchingFakeTimer()) {
                      return true;
                  }
                  else {
                      return delegate.apply(self, args);
                  }
              };
          });
          // patch useFakeTimers(), set useFakeTimersCalled flag, and make test auto run into fakeAsync
          api.patchMethod(Timer, 'useFakeTimers', delegate => {
              return function (self, args) {
                  Zone[api.symbol('useFakeTimersCalled')] = true;
                  if (isModern || isInTestFunc()) {
                      return delegate.apply(self, args);
                  }
                  return self;
              };
          });
          // patch useRealTimers(), unset useFakeTimers flag
          api.patchMethod(Timer, 'useRealTimers', delegate => {
              return function (self, args) {
                  Zone[api.symbol('useFakeTimersCalled')] = false;
                  if (isModern || isInTestFunc()) {
                      return delegate.apply(self, args);
                  }
                  return self;
              };
          });
          // patch setSystemTime(), call setCurrentRealTime() in the fakeAsyncTest
          api.patchMethod(Timer, 'setSystemTime', delegate => {
              return function (self, args) {
                  const fakeAsyncZoneSpec = Zone.current.get('FakeAsyncTestZoneSpec');
                  if (fakeAsyncZoneSpec && isPatchingFakeTimer()) {
                      fakeAsyncZoneSpec.setFakeBaseSystemTime(args[0]);
                  }
                  else {
                      return delegate.apply(self, args);
                  }
              };
          });
          // patch getSystemTime(), call getCurrentRealTime() in the fakeAsyncTest
          api.patchMethod(Timer, 'getRealSystemTime', delegate => {
              return function (self, args) {
                  const fakeAsyncZoneSpec = Zone.current.get('FakeAsyncTestZoneSpec');
                  if (fakeAsyncZoneSpec && isPatchingFakeTimer()) {
                      return fakeAsyncZoneSpec.getRealSystemTime();
                  }
                  else {
                      return delegate.apply(self, args);
                  }
              };
          });
          // patch runAllTicks(), run all microTasks inside fakeAsync
          api.patchMethod(Timer, 'runAllTicks', delegate => {
              return function (self, args) {
                  const fakeAsyncZoneSpec = Zone.current.get('FakeAsyncTestZoneSpec');
                  if (fakeAsyncZoneSpec) {
                      fakeAsyncZoneSpec.flushMicrotasks();
                  }
                  else {
                      return delegate.apply(self, args);
                  }
              };
          });
          // patch runAllTimers(), run all macroTasks inside fakeAsync
          api.patchMethod(Timer, 'runAllTimers', delegate => {
              return function (self, args) {
                  const fakeAsyncZoneSpec = Zone.current.get('FakeAsyncTestZoneSpec');
                  if (fakeAsyncZoneSpec) {
                      fakeAsyncZoneSpec.flush(100, true);
                  }
                  else {
                      return delegate.apply(self, args);
                  }
              };
          });
          // patch advanceTimersByTime(), call tick() in the fakeAsyncTest
          api.patchMethod(Timer, 'advanceTimersByTime', delegate => {
              return function (self, args) {
                  const fakeAsyncZoneSpec = Zone.current.get('FakeAsyncTestZoneSpec');
                  if (fakeAsyncZoneSpec) {
                      fakeAsyncZoneSpec.tick(args[0]);
                  }
                  else {
                      return delegate.apply(self, args);
                  }
              };
          });
          // patch runOnlyPendingTimers(), call flushOnlyPendingTimers() in the fakeAsyncTest
          api.patchMethod(Timer, 'runOnlyPendingTimers', delegate => {
              return function (self, args) {
                  const fakeAsyncZoneSpec = Zone.current.get('FakeAsyncTestZoneSpec');
                  if (fakeAsyncZoneSpec) {
                      fakeAsyncZoneSpec.flushOnlyPendingTimers();
                  }
                  else {
                      return delegate.apply(self, args);
                  }
              };
          });
          // patch advanceTimersToNextTimer(), call tickToNext() in the fakeAsyncTest
          api.patchMethod(Timer, 'advanceTimersToNextTimer', delegate => {
              return function (self, args) {
                  const fakeAsyncZoneSpec = Zone.current.get('FakeAsyncTestZoneSpec');
                  if (fakeAsyncZoneSpec) {
                      fakeAsyncZoneSpec.tickToNext(args[0]);
                  }
                  else {
                      return delegate.apply(self, args);
                  }
              };
          });
          // patch clearAllTimers(), call removeAllTimers() in the fakeAsyncTest
          api.patchMethod(Timer, 'clearAllTimers', delegate => {
              return function (self, args) {
                  const fakeAsyncZoneSpec = Zone.current.get('FakeAsyncTestZoneSpec');
                  if (fakeAsyncZoneSpec) {
                      fakeAsyncZoneSpec.removeAllTimers();
                  }
                  else {
                      return delegate.apply(self, args);
                  }
              };
          });
          // patch getTimerCount(), call getTimerCount() in the fakeAsyncTest
          api.patchMethod(Timer, 'getTimerCount', delegate => {
              return function (self, args) {
                  const fakeAsyncZoneSpec = Zone.current.get('FakeAsyncTestZoneSpec');
                  if (fakeAsyncZoneSpec) {
                      return fakeAsyncZoneSpec.getTimerCount();
                  }
                  else {
                      return delegate.apply(self, args);
                  }
              };
          });
      };
  });
  
  /**
   * @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
   */
  Zone.__load_patch('mocha', (global, Zone) => {
      const Mocha = global.Mocha;
      if (typeof Mocha === 'undefined') {
          // return if Mocha is not available, because now zone-testing
          // will load mocha patch with jasmine/jest patch
          return;
      }
      if (typeof Zone === 'undefined') {
          throw new Error('Missing Zone.js');
      }
      const ProxyZoneSpec = Zone['ProxyZoneSpec'];
      const SyncTestZoneSpec = Zone['SyncTestZoneSpec'];
      if (!ProxyZoneSpec) {
          throw new Error('Missing ProxyZoneSpec');
      }
      if (Mocha['__zone_patch__']) {
          throw new Error('"Mocha" has already been patched with "Zone".');
      }
      Mocha['__zone_patch__'] = true;
      const rootZone = Zone.current;
      const syncZone = rootZone.fork(new SyncTestZoneSpec('Mocha.describe'));
      let testZone = null;
      const suiteZone = rootZone.fork(new ProxyZoneSpec());
      const mochaOriginal = {
          after: Mocha.after,
          afterEach: Mocha.afterEach,
          before: Mocha.before,
          beforeEach: Mocha.beforeEach,
          describe: Mocha.describe,
          it: Mocha.it
      };
      function modifyArguments(args, syncTest, asyncTest) {
          for (let i = 0; i < args.length; i++) {
              let arg = args[i];
              if (typeof arg === 'function') {
                  // The `done` callback is only passed through if the function expects at
                  // least one argument.
                  // Note we have to make a function with correct number of arguments,
                  // otherwise mocha will
                  // think that all functions are sync or async.
                  args[i] = (arg.length === 0) ? syncTest(arg) : asyncTest(arg);
                  // Mocha uses toString to view the test body in the result list, make sure we return the
                  // correct function body
                  args[i].toString = function () {
                      return arg.toString();
                  };
              }
          }
          return args;
      }
      function wrapDescribeInZone(args) {
          const syncTest = function (fn) {
              return function () {
                  return syncZone.run(fn, this, arguments);
              };
          };
          return modifyArguments(args, syncTest);
      }
      function wrapTestInZone(args) {
          const asyncTest = function (fn) {
              return function (done) {
                  return testZone.run(fn, this, [done]);
              };
          };
          const syncTest = function (fn) {
              return function () {
                  return testZone.run(fn, this);
              };
          };
          return modifyArguments(args, syncTest, asyncTest);
      }
      function wrapSuiteInZone(args) {
          const asyncTest = function (fn) {
              return function (done) {
                  return suiteZone.run(fn, this, [done]);
              };
          };
          const syncTest = function (fn) {
              return function () {
                  return suiteZone.run(fn, this);
              };
          };
          return modifyArguments(args, syncTest, asyncTest);
      }
      global.describe = global.suite = Mocha.describe = function () {
          return mochaOriginal.describe.apply(this, wrapDescribeInZone(arguments));
      };
      global.xdescribe = global.suite.skip = Mocha.describe.skip = function () {
          return mochaOriginal.describe.skip.apply(this, wrapDescribeInZone(arguments));
      };
      global.describe.only = global.suite.only = Mocha.describe.only = function () {
          return mochaOriginal.describe.only.apply(this, wrapDescribeInZone(arguments));
      };
      global.it = global.specify = global.test = Mocha.it = function () {
          return mochaOriginal.it.apply(this, wrapTestInZone(arguments));
      };
      global.xit = global.xspecify = Mocha.it.skip = function () {
          return mochaOriginal.it.skip.apply(this, wrapTestInZone(arguments));
      };
      global.it.only = global.test.only = Mocha.it.only = function () {
          return mochaOriginal.it.only.apply(this, wrapTestInZone(arguments));
      };
      global.after = global.suiteTeardown = Mocha.after = function () {
          return mochaOriginal.after.apply(this, wrapSuiteInZone(arguments));
      };
      global.afterEach = global.teardown = Mocha.afterEach = function () {
          return mochaOriginal.afterEach.apply(this, wrapTestInZone(arguments));
      };
      global.before = global.suiteSetup = Mocha.before = function () {
          return mochaOriginal.before.apply(this, wrapSuiteInZone(arguments));
      };
      global.beforeEach = global.setup = Mocha.beforeEach = function () {
          return mochaOriginal.beforeEach.apply(this, wrapTestInZone(arguments));
      };
      ((originalRunTest, originalRun) => {
          Mocha.Runner.prototype.runTest = function (fn) {
              Zone.current.scheduleMicroTask('mocha.forceTask', () => {
                  originalRunTest.call(this, fn);
              });
          };
          Mocha.Runner.prototype.run = function (fn) {
              this.on('test', (e) => {
                  testZone = rootZone.fork(new ProxyZoneSpec());
              });
              this.on('fail', (test, err) => {
                  const proxyZoneSpec = testZone && testZone.get('ProxyZoneSpec');
                  if (proxyZoneSpec && err) {
                      try {
                          // try catch here in case err.message is not writable
                          err.message += proxyZoneSpec.getAndClearPendingTasksInfo();
                      }
                      catch (error) {
                      }
                  }
              });
              return originalRun.call(this, fn);
          };
      })(Mocha.Runner.prototype.runTest, Mocha.Runner.prototype.run);
  });
  
  /**
   * @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
   */
  (function (_global) {
      class AsyncTestZoneSpec {
          constructor(finishCallback, failCallback, namePrefix) {
              this.finishCallback = finishCallback;
              this.failCallback = failCallback;
              this._pendingMicroTasks = false;
              this._pendingMacroTasks = false;
              this._alreadyErrored = false;
              this._isSync = false;
              this.runZone = Zone.current;
              this.unresolvedChainedPromiseCount = 0;
              this.supportWaitUnresolvedChainedPromise = false;
              this.name = 'asyncTestZone for ' + namePrefix;
              this.properties = { 'AsyncTestZoneSpec': this };
              this.supportWaitUnresolvedChainedPromise =
                  _global[Zone.__symbol__('supportWaitUnResolvedChainedPromise')] === true;
          }
          isUnresolvedChainedPromisePending() {
              return this.unresolvedChainedPromiseCount > 0;
          }
          _finishCallbackIfDone() {
              if (!(this._pendingMicroTasks || this._pendingMacroTasks ||
                  (this.supportWaitUnresolvedChainedPromise && this.isUnresolvedChainedPromisePending()))) {
                  // We do this because we would like to catch unhandled rejected promises.
                  this.runZone.run(() => {
                      setTimeout(() => {
                          if (!this._alreadyErrored && !(this._pendingMicroTasks || this._pendingMacroTasks)) {
                              this.finishCallback();
                          }
                      }, 0);
                  });
              }
          }
          patchPromiseForTest() {
              if (!this.supportWaitUnresolvedChainedPromise) {
                  return;
              }
              const patchPromiseForTest = Promise[Zone.__symbol__('patchPromiseForTest')];
              if (patchPromiseForTest) {
                  patchPromiseForTest();
              }
          }
          unPatchPromiseForTest() {
              if (!this.supportWaitUnresolvedChainedPromise) {
                  return;
              }
              const unPatchPromiseForTest = Promise[Zone.__symbol__('unPatchPromiseForTest')];
              if (unPatchPromiseForTest) {
                  unPatchPromiseForTest();
              }
          }
          onScheduleTask(delegate, current, target, task) {
              if (task.type !== 'eventTask') {
                  this._isSync = false;
              }
              if (task.type === 'microTask' && task.data && task.data instanceof Promise) {
                  // check whether the promise is a chained promise
                  if (task.data[AsyncTestZoneSpec.symbolParentUnresolved] === true) {
                      // chained promise is being scheduled
                      this.unresolvedChainedPromiseCount--;
                  }
              }
              return delegate.scheduleTask(target, task);
          }
          onInvokeTask(delegate, current, target, task, applyThis, applyArgs) {
              if (task.type !== 'eventTask') {
                  this._isSync = false;
              }
              return delegate.invokeTask(target, task, applyThis, applyArgs);
          }
          onCancelTask(delegate, current, target, task) {
              if (task.type !== 'eventTask') {
                  this._isSync = false;
              }
              return delegate.cancelTask(target, task);
          }
          // Note - we need to use onInvoke at the moment to call finish when a test is
          // fully synchronous. TODO(juliemr): remove this when the logic for
          // onHasTask changes and it calls whenever the task queues are dirty.
          // updated by(JiaLiPassion), only call finish callback when no task
          // was scheduled/invoked/canceled.
          onInvoke(parentZoneDelegate, currentZone, targetZone, delegate, applyThis, applyArgs, source) {
              try {
                  this._isSync = true;
                  return parentZoneDelegate.invoke(targetZone, delegate, applyThis, applyArgs, source);
              }
              finally {
                  const afterTaskCounts = parentZoneDelegate._taskCounts;
                  if (this._isSync) {
                      this._finishCallbackIfDone();
                  }
              }
          }
          onHandleError(parentZoneDelegate, currentZone, targetZone, error) {
              // Let the parent try to handle the error.
              const result = parentZoneDelegate.handleError(targetZone, error);
              if (result) {
                  this.failCallback(error);
                  this._alreadyErrored = true;
              }
              return false;
          }
          onHasTask(delegate, current, target, hasTaskState) {
              delegate.hasTask(target, hasTaskState);
              if (hasTaskState.change == 'microTask') {
                  this._pendingMicroTasks = hasTaskState.microTask;
                  this._finishCallbackIfDone();
              }
              else if (hasTaskState.change == 'macroTask') {
                  this._pendingMacroTasks = hasTaskState.macroTask;
                  this._finishCallbackIfDone();
              }
          }
      }
      AsyncTestZoneSpec.symbolParentUnresolved = Zone.__symbol__('parentUnresolved');
      // Export the class so that new instances can be created with proper
      // constructor params.
      Zone['AsyncTestZoneSpec'] = AsyncTestZoneSpec;
  })(typeof window !== 'undefined' && window || typeof self !== 'undefined' && self || global);
  Zone.__load_patch('asynctest', (global, Zone, api) => {
      /**
       * Wraps a test function in an asynchronous test zone. The test will automatically
       * complete when all asynchronous calls within this zone are done.
       */
      Zone[api.symbol('asyncTest')] = function asyncTest(fn) {
          // If we're running using the Jasmine test framework, adapt to call the 'done'
          // function when asynchronous activity is finished.
          if (global.jasmine) {
              // Not using an arrow function to preserve context passed from call site
              return function (done) {
                  if (!done) {
                      // if we run beforeEach in @angular/core/testing/testing_internal then we get no done
                      // fake it here and assume sync.
                      done = function () { };
                      done.fail = function (e) {
                          throw e;
                      };
                  }
                  runInTestZone(fn, this, done, (err) => {
                      if (typeof err === 'string') {
                          return done.fail(new Error(err));
                      }
                      else {
                          done.fail(err);
                      }
                  });
              };
          }
          // Otherwise, return a promise which will resolve when asynchronous activity
          // is finished. This will be correctly consumed by the Mocha framework with
          // it('...', async(myFn)); or can be used in a custom framework.
          // Not using an arrow function to preserve context passed from call site
          return function () {
              return new Promise((finishCallback, failCallback) => {
                  runInTestZone(fn, this, finishCallback, failCallback);
              });
          };
      };
      function runInTestZone(fn, context, finishCallback, failCallback) {
          const currentZone = Zone.current;
          const AsyncTestZoneSpec = Zone['AsyncTestZoneSpec'];
          if (AsyncTestZoneSpec === undefined) {
              throw new Error('AsyncTestZoneSpec is needed for the async() test helper but could not be found. ' +
                  'Please make sure that your environment includes zone.js/dist/async-test.js');
          }
          const ProxyZoneSpec = Zone['ProxyZoneSpec'];
          if (!ProxyZoneSpec) {
              throw new Error('ProxyZoneSpec is needed for the async() test helper but could not be found. ' +
                  'Please make sure that your environment includes zone.js/dist/proxy.js');
          }
          const proxyZoneSpec = ProxyZoneSpec.get();
          ProxyZoneSpec.assertPresent();
          // We need to create the AsyncTestZoneSpec outside the ProxyZone.
          // If we do it in ProxyZone then we will get to infinite recursion.
          const proxyZone = Zone.current.getZoneWith('ProxyZoneSpec');
          const previousDelegate = proxyZoneSpec.getDelegate();
          proxyZone.parent.run(() => {
              const testZoneSpec = new AsyncTestZoneSpec(() => {
                  // Need to restore the original zone.
                  if (proxyZoneSpec.getDelegate() == testZoneSpec) {
                      // Only reset the zone spec if it's
                      // sill this one. Otherwise, assume
                      // it's OK.
                      proxyZoneSpec.setDelegate(previousDelegate);
                  }
                  testZoneSpec.unPatchPromiseForTest();
                  currentZone.run(() => {
                      finishCallback();
                  });
              }, (error) => {
                  // Need to restore the original zone.
                  if (proxyZoneSpec.getDelegate() == testZoneSpec) {
                      // Only reset the zone spec if it's sill this one. Otherwise, assume it's OK.
                      proxyZoneSpec.setDelegate(previousDelegate);
                  }
                  testZoneSpec.unPatchPromiseForTest();
                  currentZone.run(() => {
                      failCallback(error);
                  });
              }, 'test');
              proxyZoneSpec.setDelegate(testZoneSpec);
              testZoneSpec.patchPromiseForTest();
          });
          return Zone.current.runGuarded(fn, context);
      }
  });
  
  /**
   * @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
   */
  (function (global) {
      const OriginalDate = global.Date;
      // Since when we compile this file to `es2015`, and if we define
      // this `FakeDate` as `class FakeDate`, and then set `FakeDate.prototype`
      // there will be an error which is `Cannot assign to read only property 'prototype'`
      // so we need to use function implementation here.
      function FakeDate() {
          if (arguments.length === 0) {
              const d = new OriginalDate();
              d.setTime(FakeDate.now());
              return d;
          }
          else {
              const args = Array.prototype.slice.call(arguments);
              return new OriginalDate(...args);
          }
      }
      FakeDate.now = function () {
          const fakeAsyncTestZoneSpec = Zone.current.get('FakeAsyncTestZoneSpec');
          if (fakeAsyncTestZoneSpec) {
              return fakeAsyncTestZoneSpec.getFakeSystemTime();
          }
          return OriginalDate.now.apply(this, arguments);
      };
      FakeDate.UTC = OriginalDate.UTC;
      FakeDate.parse = OriginalDate.parse;
      // keep a reference for zone patched timer function
      const timers = {
          setTimeout: global.setTimeout,
          setInterval: global.setInterval,
          clearTimeout: global.clearTimeout,
          clearInterval: global.clearInterval
      };
      class Scheduler {
          constructor() {
              // Scheduler queue with the tuple of end time and callback function - sorted by end time.
              this._schedulerQueue = [];
              // Current simulated time in millis.
              this._currentTickTime = 0;
              // Current fake system base time in millis.
              this._currentFakeBaseSystemTime = OriginalDate.now();
              // track requeuePeriodicTimer
              this._currentTickRequeuePeriodicEntries = [];
          }
          getCurrentTickTime() {
              return this._currentTickTime;
          }
          getFakeSystemTime() {
              return this._currentFakeBaseSystemTime + this._currentTickTime;
          }
          setFakeBaseSystemTime(fakeBaseSystemTime) {
              this._currentFakeBaseSystemTime = fakeBaseSystemTime;
          }
          getRealSystemTime() {
              return OriginalDate.now();
          }
          scheduleFunction(cb, delay, options) {
              options = Object.assign({
                  args: [],
                  isPeriodic: false,
                  isRequestAnimationFrame: false,
                  id: -1,
                  isRequeuePeriodic: false
              }, options);
              let currentId = options.id < 0 ? Scheduler.nextId++ : options.id;
              let endTime = this._currentTickTime + delay;
              // Insert so that scheduler queue remains sorted by end time.
              let newEntry = {
                  endTime: endTime,
                  id: currentId,
                  func: cb,
                  args: options.args,
                  delay: delay,
                  isPeriodic: options.isPeriodic,
                  isRequestAnimationFrame: options.isRequestAnimationFrame
              };
              if (options.isRequeuePeriodic) {
                  this._currentTickRequeuePeriodicEntries.push(newEntry);
              }
              let i = 0;
              for (; i < this._schedulerQueue.length; i++) {
                  let currentEntry = this._schedulerQueue[i];
                  if (newEntry.endTime < currentEntry.endTime) {
                      break;
                  }
              }
              this._schedulerQueue.splice(i, 0, newEntry);
              return currentId;
          }
          removeScheduledFunctionWithId(id) {
              for (let i = 0; i < this._schedulerQueue.length; i++) {
                  if (this._schedulerQueue[i].id == id) {
                      this._schedulerQueue.splice(i, 1);
                      break;
                  }
              }
          }
          removeAll() {
              this._schedulerQueue = [];
          }
          getTimerCount() {
              return this._schedulerQueue.length;
          }
          tickToNext(step = 1, doTick, tickOptions) {
              if (this._schedulerQueue.length < step) {
                  return;
              }
              // Find the last task currently queued in the scheduler queue and tick
              // till that time.
              const startTime = this._currentTickTime;
              const targetTask = this._schedulerQueue[step - 1];
              this.tick(targetTask.endTime - startTime, doTick, tickOptions);
          }
          tick(millis = 0, doTick, tickOptions) {
              let finalTime = this._currentTickTime + millis;
              let lastCurrentTime = 0;
              tickOptions = Object.assign({ processNewMacroTasksSynchronously: true }, tickOptions);
              // we need to copy the schedulerQueue so nested timeout
              // will not be wrongly called in the current tick
              // https://github.com/angular/angular/issues/33799
              const schedulerQueue = tickOptions.processNewMacroTasksSynchronously ?
                  this._schedulerQueue :
                  this._schedulerQueue.slice();
              if (schedulerQueue.length === 0 && doTick) {
                  doTick(millis);
                  return;
              }
              while (schedulerQueue.length > 0) {
                  // clear requeueEntries before each loop
                  this._currentTickRequeuePeriodicEntries = [];
                  let current = schedulerQueue[0];
                  if (finalTime < current.endTime) {
                      // Done processing the queue since it's sorted by endTime.
                      break;
                  }
                  else {
                      // Time to run scheduled function. Remove it from the head of queue.
                      let current = schedulerQueue.shift();
                      if (!tickOptions.processNewMacroTasksSynchronously) {
                          const idx = this._schedulerQueue.indexOf(current);
                          if (idx >= 0) {
                              this._schedulerQueue.splice(idx, 1);
                          }
                      }
                      lastCurrentTime = this._currentTickTime;
                      this._currentTickTime = current.endTime;
                      if (doTick) {
                          doTick(this._currentTickTime - lastCurrentTime);
                      }
                      let retval = current.func.apply(global, current.isRequestAnimationFrame ? [this._currentTickTime] : current.args);
                      if (!retval) {
                          // Uncaught exception in the current scheduled function. Stop processing the queue.
                          break;
                      }
                      // check is there any requeue periodic entry is added in
                      // current loop, if there is, we need to add to current loop
                      if (!tickOptions.processNewMacroTasksSynchronously) {
                          this._currentTickRequeuePeriodicEntries.forEach(newEntry => {
                              let i = 0;
                              for (; i < schedulerQueue.length; i++) {
                                  const currentEntry = schedulerQueue[i];
                                  if (newEntry.endTime < currentEntry.endTime) {
                                      break;
                                  }
                              }
                              schedulerQueue.splice(i, 0, newEntry);
                          });
                      }
                  }
              }
              lastCurrentTime = this._currentTickTime;
              this._currentTickTime = finalTime;
              if (doTick) {
                  doTick(this._currentTickTime - lastCurrentTime);
              }
          }
          flushOnlyPendingTimers(doTick) {
              if (this._schedulerQueue.length === 0) {
                  return 0;
              }
              // Find the last task currently queued in the scheduler queue and tick
              // till that time.
              const startTime = this._currentTickTime;
              const lastTask = this._schedulerQueue[this._schedulerQueue.length - 1];
              this.tick(lastTask.endTime - startTime, doTick, { processNewMacroTasksSynchronously: false });
              return this._currentTickTime - startTime;
          }
          flush(limit = 20, flushPeriodic = false, doTick) {
              if (flushPeriodic) {
                  return this.flushPeriodic(doTick);
              }
              else {
                  return this.flushNonPeriodic(limit, doTick);
              }
          }
          flushPeriodic(doTick) {
              if (this._schedulerQueue.length === 0) {
                  return 0;
              }
              // Find the last task currently queued in the scheduler queue and tick
              // till that time.
              const startTime = this._currentTickTime;
              const lastTask = this._schedulerQueue[this._schedulerQueue.length - 1];
              this.tick(lastTask.endTime - startTime, doTick);
              return this._currentTickTime - startTime;
          }
          flushNonPeriodic(limit, doTick) {
              const startTime = this._currentTickTime;
              let lastCurrentTime = 0;
              let count = 0;
              while (this._schedulerQueue.length > 0) {
                  count++;
                  if (count > limit) {
                      throw new Error('flush failed after reaching the limit of ' + limit +
                          ' tasks. Does your code use a polling timeout?');
                  }
                  // flush only non-periodic timers.
                  // If the only remaining tasks are periodic(or requestAnimationFrame), finish flushing.
                  if (this._schedulerQueue.filter(task => !task.isPeriodic && !task.isRequestAnimationFrame)
                      .length === 0) {
                      break;
                  }
                  const current = this._schedulerQueue.shift();
                  lastCurrentTime = this._currentTickTime;
                  this._currentTickTime = current.endTime;
                  if (doTick) {
                      // Update any secondary schedulers like Jasmine mock Date.
                      doTick(this._currentTickTime - lastCurrentTime);
                  }
                  const retval = current.func.apply(global, current.args);
                  if (!retval) {
                      // Uncaught exception in the current scheduled function. Stop processing the queue.
                      break;
                  }
              }
              return this._currentTickTime - startTime;
          }
      }
      // Next scheduler id.
      Scheduler.nextId = 1;
      class FakeAsyncTestZoneSpec {
          constructor(namePrefix, trackPendingRequestAnimationFrame = false, macroTaskOptions) {
              this.trackPendingRequestAnimationFrame = trackPendingRequestAnimationFrame;
              this.macroTaskOptions = macroTaskOptions;
              this._scheduler = new Scheduler();
              this._microtasks = [];
              this._lastError = null;
              this._uncaughtPromiseErrors = Promise[Zone.__symbol__('uncaughtPromiseErrors')];
              this.pendingPeriodicTimers = [];
              this.pendingTimers = [];
              this.patchDateLocked = false;
              this.properties = { 'FakeAsyncTestZoneSpec': this };
              this.name = 'fakeAsyncTestZone for ' + namePrefix;
              // in case user can't access the construction of FakeAsyncTestSpec
              // user can also define macroTaskOptions by define a global variable.
              if (!this.macroTaskOptions) {
                  this.macroTaskOptions = global[Zone.__symbol__('FakeAsyncTestMacroTask')];
              }
          }
          static assertInZone() {
              if (Zone.current.get('FakeAsyncTestZoneSpec') == null) {
                  throw new Error('The code should be running in the fakeAsync zone to call this function');
              }
          }
          _fnAndFlush(fn, completers) {
              return (...args) => {
                  fn.apply(global, args);
                  if (this._lastError === null) { // Success
                      if (completers.onSuccess != null) {
                          completers.onSuccess.apply(global);
                      }
                      // Flush microtasks only on success.
                      this.flushMicrotasks();
                  }
                  else { // Failure
                      if (completers.onError != null) {
                          completers.onError.apply(global);
                      }
                  }
                  // Return true if there were no errors, false otherwise.
                  return this._lastError === null;
              };
          }
          static _removeTimer(timers, id) {
              let index = timers.indexOf(id);
              if (index > -1) {
                  timers.splice(index, 1);
              }
          }
          _dequeueTimer(id) {
              return () => {
                  FakeAsyncTestZoneSpec._removeTimer(this.pendingTimers, id);
              };
          }
          _requeuePeriodicTimer(fn, interval, args, id) {
              return () => {
                  // Requeue the timer callback if it's not been canceled.
                  if (this.pendingPeriodicTimers.indexOf(id) !== -1) {
                      this._scheduler.scheduleFunction(fn, interval, { args, isPeriodic: true, id, isRequeuePeriodic: true });
                  }
              };
          }
          _dequeuePeriodicTimer(id) {
              return () => {
                  FakeAsyncTestZoneSpec._removeTimer(this.pendingPeriodicTimers, id);
              };
          }
          _setTimeout(fn, delay, args, isTimer = true) {
              let removeTimerFn = this._dequeueTimer(Scheduler.nextId);
              // Queue the callback and dequeue the timer on success and error.
              let cb = this._fnAndFlush(fn, { onSuccess: removeTimerFn, onError: removeTimerFn });
              let id = this._scheduler.scheduleFunction(cb, delay, { args, isRequestAnimationFrame: !isTimer });
              if (isTimer) {
                  this.pendingTimers.push(id);
              }
              return id;
          }
          _clearTimeout(id) {
              FakeAsyncTestZoneSpec._removeTimer(this.pendingTimers, id);
              this._scheduler.removeScheduledFunctionWithId(id);
          }
          _setInterval(fn, interval, args) {
              let id = Scheduler.nextId;
              let completers = { onSuccess: null, onError: this._dequeuePeriodicTimer(id) };
              let cb = this._fnAndFlush(fn, completers);
              // Use the callback created above to requeue on success.
              completers.onSuccess = this._requeuePeriodicTimer(cb, interval, args, id);
              // Queue the callback and dequeue the periodic timer only on error.
              this._scheduler.scheduleFunction(cb, interval, { args, isPeriodic: true });
              this.pendingPeriodicTimers.push(id);
              return id;
          }
          _clearInterval(id) {
              FakeAsyncTestZoneSpec._removeTimer(this.pendingPeriodicTimers, id);
              this._scheduler.removeScheduledFunctionWithId(id);
          }
          _resetLastErrorAndThrow() {
              let error = this._lastError || this._uncaughtPromiseErrors[0];
              this._uncaughtPromiseErrors.length = 0;
              this._lastError = null;
              throw error;
          }
          getCurrentTickTime() {
              return this._scheduler.getCurrentTickTime();
          }
          getFakeSystemTime() {
              return this._scheduler.getFakeSystemTime();
          }
          setFakeBaseSystemTime(realTime) {
              this._scheduler.setFakeBaseSystemTime(realTime);
          }
          getRealSystemTime() {
              return this._scheduler.getRealSystemTime();
          }
          static patchDate() {
              if (!!global[Zone.__symbol__('disableDatePatching')]) {
                  // we don't want to patch global Date
                  // because in some case, global Date
                  // is already being patched, we need to provide
                  // an option to let user still use their
                  // own version of Date.
                  return;
              }
              if (global['Date'] === FakeDate) {
                  // already patched
                  return;
              }
              global['Date'] = FakeDate;
              FakeDate.prototype = OriginalDate.prototype;
              // try check and reset timers
              // because jasmine.clock().install() may
              // have replaced the global timer
              FakeAsyncTestZoneSpec.checkTimerPatch();
          }
          static resetDate() {
              if (global['Date'] === FakeDate) {
                  global['Date'] = OriginalDate;
              }
          }
          static checkTimerPatch() {
              if (global.setTimeout !== timers.setTimeout) {
                  global.setTimeout = timers.setTimeout;
                  global.clearTimeout = timers.clearTimeout;
              }
              if (global.setInterval !== timers.setInterval) {
                  global.setInterval = timers.setInterval;
                  global.clearInterval = timers.clearInterval;
              }
          }
          lockDatePatch() {
              this.patchDateLocked = true;
              FakeAsyncTestZoneSpec.patchDate();
          }
          unlockDatePatch() {
              this.patchDateLocked = false;
              FakeAsyncTestZoneSpec.resetDate();
          }
          tickToNext(steps = 1, doTick, tickOptions = { processNewMacroTasksSynchronously: true }) {
              if (steps <= 0) {
                  return;
              }
              FakeAsyncTestZoneSpec.assertInZone();
              this.flushMicrotasks();
              this._scheduler.tickToNext(steps, doTick, tickOptions);
              if (this._lastError !== null) {
                  this._resetLastErrorAndThrow();
              }
          }
          tick(millis = 0, doTick, tickOptions = { processNewMacroTasksSynchronously: true }) {
              FakeAsyncTestZoneSpec.assertInZone();
              this.flushMicrotasks();
              this._scheduler.tick(millis, doTick, tickOptions);
              if (this._lastError !== null) {
                  this._resetLastErrorAndThrow();
              }
          }
          flushMicrotasks() {
              FakeAsyncTestZoneSpec.assertInZone();
              const flushErrors = () => {
                  if (this._lastError !== null || this._uncaughtPromiseErrors.length) {
                      // If there is an error stop processing the microtask queue and rethrow the error.
                      this._resetLastErrorAndThrow();
                  }
              };
              while (this._microtasks.length > 0) {
                  let microtask = this._microtasks.shift();
                  microtask.func.apply(microtask.target, microtask.args);
              }
              flushErrors();
          }
          flush(limit, flushPeriodic, doTick) {
              FakeAsyncTestZoneSpec.assertInZone();
              this.flushMicrotasks();
              const elapsed = this._scheduler.flush(limit, flushPeriodic, doTick);
              if (this._lastError !== null) {
                  this._resetLastErrorAndThrow();
              }
              return elapsed;
          }
          flushOnlyPendingTimers(doTick) {
              FakeAsyncTestZoneSpec.assertInZone();
              this.flushMicrotasks();
              const elapsed = this._scheduler.flushOnlyPendingTimers(doTick);
              if (this._lastError !== null) {
                  this._resetLastErrorAndThrow();
              }
              return elapsed;
          }
          removeAllTimers() {
              FakeAsyncTestZoneSpec.assertInZone();
              this._scheduler.removeAll();
              this.pendingPeriodicTimers = [];
              this.pendingTimers = [];
          }
          getTimerCount() {
              return this._scheduler.getTimerCount() + this._microtasks.length;
          }
          onScheduleTask(delegate, current, target, task) {
              switch (task.type) {
                  case 'microTask':
                      let args = task.data && task.data.args;
                      // should pass additional arguments to callback if have any
                      // currently we know process.nextTick will have such additional
                      // arguments
                      let additionalArgs;
                      if (args) {
                          let callbackIndex = task.data.cbIdx;
                          if (typeof args.length === 'number' && args.length > callbackIndex + 1) {
                              additionalArgs = Array.prototype.slice.call(args, callbackIndex + 1);
                          }
                      }
                      this._microtasks.push({
                          func: task.invoke,
                          args: additionalArgs,
                          target: task.data && task.data.target
                      });
                      break;
                  case 'macroTask':
                      switch (task.source) {
                          case 'setTimeout':
                              task.data['handleId'] = this._setTimeout(task.invoke, task.data['delay'], Array.prototype.slice.call(task.data['args'], 2));
                              break;
                          case 'setImmediate':
                              task.data['handleId'] = this._setTimeout(task.invoke, 0, Array.prototype.slice.call(task.data['args'], 1));
                              break;
                          case 'setInterval':
                              task.data['handleId'] = this._setInterval(task.invoke, task.data['delay'], Array.prototype.slice.call(task.data['args'], 2));
                              break;
                          case 'XMLHttpRequest.send':
                              throw new Error('Cannot make XHRs from within a fake async test. Request URL: ' +
                                  task.data['url']);
                          case 'requestAnimationFrame':
                          case 'webkitRequestAnimationFrame':
                          case 'mozRequestAnimationFrame':
                              // Simulate a requestAnimationFrame by using a setTimeout with 16 ms.
                              // (60 frames per second)
                              task.data['handleId'] = this._setTimeout(task.invoke, 16, task.data['args'], this.trackPendingRequestAnimationFrame);
                              break;
                          default:
                              // user can define which macroTask they want to support by passing
                              // macroTaskOptions
                              const macroTaskOption = this.findMacroTaskOption(task);
                              if (macroTaskOption) {
                                  const args = task.data && task.data['args'];
                                  const delay = args && args.length > 1 ? args[1] : 0;
                                  let callbackArgs = macroTaskOption.callbackArgs ? macroTaskOption.callbackArgs : args;
                                  if (!!macroTaskOption.isPeriodic) {
                                      // periodic macroTask, use setInterval to simulate
                                      task.data['handleId'] = this._setInterval(task.invoke, delay, callbackArgs);
                                      task.data.isPeriodic = true;
                                  }
                                  else {
                                      // not periodic, use setTimeout to simulate
                                      task.data['handleId'] = this._setTimeout(task.invoke, delay, callbackArgs);
                                  }
                                  break;
                              }
                              throw new Error('Unknown macroTask scheduled in fake async test: ' + task.source);
                      }
                      break;
                  case 'eventTask':
                      task = delegate.scheduleTask(target, task);
                      break;
              }
              return task;
          }
          onCancelTask(delegate, current, target, task) {
              switch (task.source) {
                  case 'setTimeout':
                  case 'requestAnimationFrame':
                  case 'webkitRequestAnimationFrame':
                  case 'mozRequestAnimationFrame':
                      return this._clearTimeout(task.data['handleId']);
                  case 'setInterval':
                      return this._clearInterval(task.data['handleId']);
                  default:
                      // user can define which macroTask they want to support by passing
                      // macroTaskOptions
                      const macroTaskOption = this.findMacroTaskOption(task);
                      if (macroTaskOption) {
                          const handleId = task.data['handleId'];
                          return macroTaskOption.isPeriodic ? this._clearInterval(handleId) :
                              this._clearTimeout(handleId);
                      }
                      return delegate.cancelTask(target, task);
              }
          }
          onInvoke(delegate, current, target, callback, applyThis, applyArgs, source) {
              try {
                  FakeAsyncTestZoneSpec.patchDate();
                  return delegate.invoke(target, callback, applyThis, applyArgs, source);
              }
              finally {
                  if (!this.patchDateLocked) {
                      FakeAsyncTestZoneSpec.resetDate();
                  }
              }
          }
          findMacroTaskOption(task) {
              if (!this.macroTaskOptions) {
                  return null;
              }
              for (let i = 0; i < this.macroTaskOptions.length; i++) {
                  const macroTaskOption = this.macroTaskOptions[i];
                  if (macroTaskOption.source === task.source) {
                      return macroTaskOption;
                  }
              }
              return null;
          }
          onHandleError(parentZoneDelegate, currentZone, targetZone, error) {
              this._lastError = error;
              return false; // Don't propagate error to parent zone.
          }
      }
      // Export the class so that new instances can be created with proper
      // constructor params.
      Zone['FakeAsyncTestZoneSpec'] = FakeAsyncTestZoneSpec;
  })(typeof window === 'object' && window || typeof self === 'object' && self || global);
  Zone.__load_patch('fakeasync', (global, Zone, api) => {
      const FakeAsyncTestZoneSpec = Zone && Zone['FakeAsyncTestZoneSpec'];
      function getProxyZoneSpec() {
          return Zone && Zone['ProxyZoneSpec'];
      }
      let _fakeAsyncTestZoneSpec = null;
      /**
       * Clears out the shared fake async zone for a test.
       * To be called in a global `beforeEach`.
       *
       * @experimental
       */
      function resetFakeAsyncZone() {
          if (_fakeAsyncTestZoneSpec) {
              _fakeAsyncTestZoneSpec.unlockDatePatch();
          }
          _fakeAsyncTestZoneSpec = null;
          // in node.js testing we may not have ProxyZoneSpec in which case there is nothing to reset.
          getProxyZoneSpec() && getProxyZoneSpec().assertPresent().resetDelegate();
      }
      /**
       * Wraps a function to be executed in the fakeAsync zone:
       * - microtasks are manually executed by calling `flushMicrotasks()`,
       * - timers are synchronous, `tick()` simulates the asynchronous passage of time.
       *
       * If there are any pending timers at the end of the function, an exception will be thrown.
       *
       * Can be used to wrap inject() calls.
       *
       * ## Example
       *
       * {@example core/testing/ts/fake_async.ts region='basic'}
       *
       * @param fn
       * @returns The function wrapped to be executed in the fakeAsync zone
       *
       * @experimental
       */
      function fakeAsync(fn) {
          // Not using an arrow function to preserve context passed from call site
          const fakeAsyncFn = function (...args) {
              const ProxyZoneSpec = getProxyZoneSpec();
              if (!ProxyZoneSpec) {
                  throw new Error('ProxyZoneSpec is needed for the async() test helper but could not be found. ' +
                      'Please make sure that your environment includes zone.js/dist/proxy.js');
              }
              const proxyZoneSpec = ProxyZoneSpec.assertPresent();
              if (Zone.current.get('FakeAsyncTestZoneSpec')) {
                  throw new Error('fakeAsync() calls can not be nested');
              }
              try {
                  // in case jasmine.clock init a fakeAsyncTestZoneSpec
                  if (!_fakeAsyncTestZoneSpec) {
                      if (proxyZoneSpec.getDelegate() instanceof FakeAsyncTestZoneSpec) {
                          throw new Error('fakeAsync() calls can not be nested');
                      }
                      _fakeAsyncTestZoneSpec = new FakeAsyncTestZoneSpec();
                  }
                  let res;
                  const lastProxyZoneSpec = proxyZoneSpec.getDelegate();
                  proxyZoneSpec.setDelegate(_fakeAsyncTestZoneSpec);
                  _fakeAsyncTestZoneSpec.lockDatePatch();
                  try {
                      res = fn.apply(this, args);
                      flushMicrotasks();
                  }
                  finally {
                      proxyZoneSpec.setDelegate(lastProxyZoneSpec);
                  }
                  if (_fakeAsyncTestZoneSpec.pendingPeriodicTimers.length > 0) {
                      throw new Error(`${_fakeAsyncTestZoneSpec.pendingPeriodicTimers.length} ` +
                          `periodic timer(s) still in the queue.`);
                  }
                  if (_fakeAsyncTestZoneSpec.pendingTimers.length > 0) {
                      throw new Error(`${_fakeAsyncTestZoneSpec.pendingTimers.length} timer(s) still in the queue.`);
                  }
                  return res;
              }
              finally {
                  resetFakeAsyncZone();
              }
          };
          fakeAsyncFn.isFakeAsync = true;
          return fakeAsyncFn;
      }
      function _getFakeAsyncZoneSpec() {
          if (_fakeAsyncTestZoneSpec == null) {
              _fakeAsyncTestZoneSpec = Zone.current.get('FakeAsyncTestZoneSpec');
              if (_fakeAsyncTestZoneSpec == null) {
                  throw new Error('The code should be running in the fakeAsync zone to call this function');
              }
          }
          return _fakeAsyncTestZoneSpec;
      }
      /**
       * Simulates the asynchronous passage of time for the timers in the fakeAsync zone.
       *
       * The microtasks queue is drained at the very start of this function and after any timer callback
       * has been executed.
       *
       * ## Example
       *
       * {@example core/testing/ts/fake_async.ts region='basic'}
       *
       * @experimental
       */
      function tick(millis = 0, ignoreNestedTimeout = false) {
          _getFakeAsyncZoneSpec().tick(millis, null, ignoreNestedTimeout);
      }
      /**
       * Simulates the asynchronous passage of time for the timers in the fakeAsync zone by
       * draining the macrotask queue until it is empty. The returned value is the milliseconds
       * of time that would have been elapsed.
       *
       * @param maxTurns
       * @returns The simulated time elapsed, in millis.
       *
       * @experimental
       */
      function flush(maxTurns) {
          return _getFakeAsyncZoneSpec().flush(maxTurns);
      }
      /**
       * Discard all remaining periodic tasks.
       *
       * @experimental
       */
      function discardPeriodicTasks() {
          const zoneSpec = _getFakeAsyncZoneSpec();
          const pendingTimers = zoneSpec.pendingPeriodicTimers;
          zoneSpec.pendingPeriodicTimers.length = 0;
      }
      /**
       * Flush any pending microtasks.
       *
       * @experimental
       */
      function flushMicrotasks() {
          _getFakeAsyncZoneSpec().flushMicrotasks();
      }
      Zone[api.symbol('fakeAsyncTest')] =
          { resetFakeAsyncZone, flushMicrotasks, discardPeriodicTasks, tick, flush, fakeAsync };
  }, true);
  
  /**
   * @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
   */
  /**
   * Promise for async/fakeAsync zoneSpec test
   * can support async operation which not supported by zone.js
   * such as
   * it ('test jsonp in AsyncZone', async() => {
   *   new Promise(res => {
   *     jsonp(url, (data) => {
   *       // success callback
   *       res(data);
   *     });
   *   }).then((jsonpResult) => {
   *     // get jsonp result.
   *
   *     // user will expect AsyncZoneSpec wait for
   *     // then, but because jsonp is not zone aware
   *     // AsyncZone will finish before then is called.
   *   });
   * });
   */
  Zone.__load_patch('promisefortest', (global, Zone, api) => {
      const symbolState = api.symbol('state');
      const UNRESOLVED = null;
      const symbolParentUnresolved = api.symbol('parentUnresolved');
      // patch Promise.prototype.then to keep an internal
      // number for tracking unresolved chained promise
      // we will decrease this number when the parent promise
      // being resolved/rejected and chained promise was
      // scheduled as a microTask.
      // so we can know such kind of chained promise still
      // not resolved in AsyncTestZone
      Promise[api.symbol('patchPromiseForTest')] = function patchPromiseForTest() {
          let oriThen = Promise[Zone.__symbol__('ZonePromiseThen')];
          if (oriThen) {
              return;
          }
          oriThen = Promise[Zone.__symbol__('ZonePromiseThen')] = Promise.prototype.then;
          Promise.prototype.then = function () {
              const chained = oriThen.apply(this, arguments);
              if (this[symbolState] === UNRESOLVED) {
                  // parent promise is unresolved.
                  const asyncTestZoneSpec = Zone.current.get('AsyncTestZoneSpec');
                  if (asyncTestZoneSpec) {
                      asyncTestZoneSpec.unresolvedChainedPromiseCount++;
                      chained[symbolParentUnresolved] = true;
                  }
              }
              return chained;
          };
      };
      Promise[api.symbol('unPatchPromiseForTest')] = function unpatchPromiseForTest() {
          // restore origin then
          const oriThen = Promise[Zone.__symbol__('ZonePromiseThen')];
          if (oriThen) {
              Promise.prototype.then = oriThen;
              Promise[Zone.__symbol__('ZonePromiseThen')] = undefined;
          }
      };
  });
  