/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import './util/ng_jit_mode';
import { merge, Observable } from 'rxjs';
import { share } from 'rxjs/operators';
import { ApplicationInitStatus } from './application_init';
import { APP_BOOTSTRAP_LISTENER, PLATFORM_INITIALIZER } from './application_tokens';
import { getCompilerFacade } from './compiler/compiler_facade';
import { Console } from './console';
import { Injectable } from './di/injectable';
import { InjectionToken } from './di/injection_token';
import { Injector } from './di/injector';
import { EnvironmentInjector } from './di/r3_injector';
import { INJECTOR_SCOPE } from './di/scope';
import { ErrorHandler } from './error_handler';
import { formatRuntimeError, RuntimeError } from './errors';
import { DEFAULT_LOCALE_ID } from './i18n/localization';
import { LOCALE_ID } from './i18n/tokens';
import { COMPILER_OPTIONS } from './linker/compiler';
import { ComponentFactory } from './linker/component_factory';
import { ComponentFactoryResolver } from './linker/component_factory_resolver';
import { NgModuleRef } from './linker/ng_module_factory';
import { isComponentResourceResolutionQueueEmpty, resolveComponentResources } from './metadata/resource_loading';
import { assertNgModuleType } from './render3/assert';
import { isStandalone } from './render3/definition';
import { assertStandaloneComponentType } from './render3/errors';
import { setLocaleId } from './render3/i18n/i18n_locale_id';
import { setJitOptions } from './render3/jit/jit_options';
import { createEnvironmentInjector, NgModuleFactory as R3NgModuleFactory } from './render3/ng_module_ref';
import { publishDefaultGlobalUtils as _publishDefaultGlobalUtils } from './render3/util/global_utils';
import { TESTABILITY } from './testability/testability';
import { isPromise } from './util/lang';
import { scheduleMicroTask } from './util/microtask';
import { stringify } from './util/stringify';
import { NgZone, NoopNgZone } from './zone/ng_zone';
import * as i0 from "./r3_symbols";
import * as i1 from "./di/injector";
import * as i2 from "./zone/ng_zone";
import * as i3 from "./di/r3_injector";
import * as i4 from "./error_handler";
let _platformInjector = null;
/**
 * Internal token to indicate whether having multiple bootstrapped platform should be allowed (only
 * one bootstrapped platform is allowed by default). This token helps to support SSR scenarios.
 */
export const ALLOW_MULTIPLE_PLATFORMS = new InjectionToken('AllowMultipleToken');
/**
 * Internal token that allows to register extra callbacks that should be invoked during the
 * `PlatformRef.destroy` operation. This token is needed to avoid a direct reference to the
 * `PlatformRef` class (i.e. register the callback via `PlatformRef.onDestroy`), thus making the
 * entire class tree-shakeable.
 */
const PLATFORM_DESTROY_LISTENERS = new InjectionToken('PlatformDestroyListeners');
const NG_DEV_MODE = typeof ngDevMode === 'undefined' || ngDevMode;
export function compileNgModuleFactory(injector, options, moduleType) {
    ngDevMode && assertNgModuleType(moduleType);
    const moduleFactory = new R3NgModuleFactory(moduleType);
    // All of the logic below is irrelevant for AOT-compiled code.
    if (typeof ngJitMode !== 'undefined' && !ngJitMode) {
        return Promise.resolve(moduleFactory);
    }
    const compilerOptions = injector.get(COMPILER_OPTIONS, []).concat(options);
    // Configure the compiler to use the provided options. This call may fail when multiple modules
    // are bootstrapped with incompatible options, as a component can only be compiled according to
    // a single set of options.
    setJitOptions({
        defaultEncapsulation: _lastDefined(compilerOptions.map(opts => opts.defaultEncapsulation)),
        preserveWhitespaces: _lastDefined(compilerOptions.map(opts => opts.preserveWhitespaces)),
    });
    if (isComponentResourceResolutionQueueEmpty()) {
        return Promise.resolve(moduleFactory);
    }
    const compilerProviders = _mergeArrays(compilerOptions.map(o => o.providers));
    // In case there are no compiler providers, we just return the module factory as
    // there won't be any resource loader. This can happen with Ivy, because AOT compiled
    // modules can be still passed through "bootstrapModule". In that case we shouldn't
    // unnecessarily require the JIT compiler.
    if (compilerProviders.length === 0) {
        return Promise.resolve(moduleFactory);
    }
    const compiler = getCompilerFacade({
        usage: 0 /* JitCompilerUsage.Decorator */,
        kind: 'NgModule',
        type: moduleType,
    });
    const compilerInjector = Injector.create({ providers: compilerProviders });
    const resourceLoader = compilerInjector.get(compiler.ResourceLoader);
    // The resource loader can also return a string while the "resolveComponentResources"
    // always expects a promise. Therefore we need to wrap the returned value in a promise.
    return resolveComponentResources(url => Promise.resolve(resourceLoader.get(url)))
        .then(() => moduleFactory);
}
export function publishDefaultGlobalUtils() {
    ngDevMode && _publishDefaultGlobalUtils();
}
export function isBoundToModule(cf) {
    return cf.isBoundToModule;
}
/**
 * A token for third-party components that can register themselves with NgProbe.
 *
 * @publicApi
 */
export class NgProbeToken {
    constructor(name, token) {
        this.name = name;
        this.token = token;
    }
}
/**
 * Creates a platform.
 * Platforms must be created on launch using this function.
 *
 * @publicApi
 */
export function createPlatform(injector) {
    if (_platformInjector && !_platformInjector.get(ALLOW_MULTIPLE_PLATFORMS, false)) {
        throw new RuntimeError(400 /* RuntimeErrorCode.MULTIPLE_PLATFORMS */, ngDevMode &&
            'There can be only one platform. Destroy the previous one to create a new one.');
    }
    publishDefaultGlobalUtils();
    _platformInjector = injector;
    const platform = injector.get(PlatformRef);
    runPlatformInitializers(injector);
    return platform;
}
/**
 * The goal of this function is to bootstrap a platform injector,
 * but avoid referencing `PlatformRef` class.
 * This function is needed for bootstrapping a Standalone Component.
 */
export function createOrReusePlatformInjector(providers = []) {
    // If a platform injector already exists, it means that the platform
    // is already bootstrapped and no additional actions are required.
    if (_platformInjector)
        return _platformInjector;
    // Otherwise, setup a new platform injector and run platform initializers.
    const injector = createPlatformInjector(providers);
    _platformInjector = injector;
    publishDefaultGlobalUtils();
    runPlatformInitializers(injector);
    return injector;
}
export function runPlatformInitializers(injector) {
    const inits = injector.get(PLATFORM_INITIALIZER, null);
    if (inits) {
        inits.forEach((init) => init());
    }
}
/**
 * Internal create application API that implements the core application creation logic and optional
 * bootstrap logic.
 *
 * Platforms (such as `platform-browser`) may require different set of application and platform
 * providers for an application to function correctly. As a result, platforms may use this function
 * internally and supply the necessary providers during the bootstrap, while exposing
 * platform-specific APIs as a part of their public API.
 *
 * @returns A promise that returns an `ApplicationRef` instance once resolved.
 */
export function internalCreateApplication(config) {
    const { rootComponent, appProviders, platformProviders } = config;
    if (NG_DEV_MODE && rootComponent !== undefined) {
        assertStandaloneComponentType(rootComponent);
    }
    const platformInjector = createOrReusePlatformInjector(platformProviders);
    const ngZone = getNgZone('zone.js', getNgZoneOptions());
    return ngZone.run(() => {
        // Create root application injector based on a set of providers configured at the platform
        // bootstrap level as well as providers passed to the bootstrap call by a user.
        const allAppProviders = [
            { provide: NgZone, useValue: ngZone },
            ...(appProviders || []), //
        ];
        const envInjector = createEnvironmentInjector(allAppProviders, platformInjector, 'Environment Injector');
        const exceptionHandler = envInjector.get(ErrorHandler, null);
        if (NG_DEV_MODE && !exceptionHandler) {
            throw new RuntimeError(402 /* RuntimeErrorCode.ERROR_HANDLER_NOT_FOUND */, 'No `ErrorHandler` found in the Dependency Injection tree.');
        }
        let onErrorSubscription;
        ngZone.runOutsideAngular(() => {
            onErrorSubscription = ngZone.onError.subscribe({
                next: (error) => {
                    exceptionHandler.handleError(error);
                }
            });
        });
        // If the whole platform is destroyed, invoke the `destroy` method
        // for all bootstrapped applications as well.
        const destroyListener = () => envInjector.destroy();
        const onPlatformDestroyListeners = platformInjector.get(PLATFORM_DESTROY_LISTENERS);
        onPlatformDestroyListeners.add(destroyListener);
        envInjector.onDestroy(() => {
            onErrorSubscription.unsubscribe();
            onPlatformDestroyListeners.delete(destroyListener);
        });
        return _callAndReportToErrorHandler(exceptionHandler, ngZone, () => {
            const initStatus = envInjector.get(ApplicationInitStatus);
            initStatus.runInitializers();
            return initStatus.donePromise.then(() => {
                const localeId = envInjector.get(LOCALE_ID, DEFAULT_LOCALE_ID);
                setLocaleId(localeId || DEFAULT_LOCALE_ID);
                const appRef = envInjector.get(ApplicationRef);
                if (rootComponent !== undefined) {
                    appRef.bootstrap(rootComponent);
                }
                return appRef;
            });
        });
    });
}
/**
 * Creates a factory for a platform. Can be used to provide or override `Providers` specific to
 * your application's runtime needs, such as `PLATFORM_INITIALIZER` and `PLATFORM_ID`.
 * @param parentPlatformFactory Another platform factory to modify. Allows you to compose factories
 * to build up configurations that might be required by different libraries or parts of the
 * application.
 * @param name Identifies the new platform factory.
 * @param providers A set of dependency providers for platforms created with the new factory.
 *
 * @publicApi
 */
export function createPlatformFactory(parentPlatformFactory, name, providers = []) {
    const desc = `Platform: ${name}`;
    const marker = new InjectionToken(desc);
    return (extraProviders = []) => {
        let platform = getPlatform();
        if (!platform || platform.injector.get(ALLOW_MULTIPLE_PLATFORMS, false)) {
            const platformProviders = [
                ...providers,
                ...extraProviders,
                { provide: marker, useValue: true }
            ];
            if (parentPlatformFactory) {
                parentPlatformFactory(platformProviders);
            }
            else {
                createPlatform(createPlatformInjector(platformProviders, desc));
            }
        }
        return assertPlatform(marker);
    };
}
/**
 * Checks that there is currently a platform that contains the given token as a provider.
 *
 * @publicApi
 */
export function assertPlatform(requiredToken) {
    const platform = getPlatform();
    if (!platform) {
        throw new RuntimeError(401 /* RuntimeErrorCode.PLATFORM_NOT_FOUND */, ngDevMode && 'No platform exists!');
    }
    if ((typeof ngDevMode === 'undefined' || ngDevMode) &&
        !platform.injector.get(requiredToken, null)) {
        throw new RuntimeError(400 /* RuntimeErrorCode.MULTIPLE_PLATFORMS */, 'A platform with a different configuration has been created. Please destroy it first.');
    }
    return platform;
}
/**
 * Helper function to create an instance of a platform injector (that maintains the 'platform'
 * scope).
 */
export function createPlatformInjector(providers = [], name) {
    return Injector.create({
        name,
        providers: [
            { provide: INJECTOR_SCOPE, useValue: 'platform' },
            { provide: PLATFORM_DESTROY_LISTENERS, useValue: new Set([() => _platformInjector = null]) },
            ...providers
        ],
    });
}
/**
 * Destroys the current Angular platform and all Angular applications on the page.
 * Destroys all modules and listeners registered with the platform.
 *
 * @publicApi
 */
export function destroyPlatform() {
    getPlatform()?.destroy();
}
/**
 * Returns the current platform.
 *
 * @publicApi
 */
export function getPlatform() {
    return _platformInjector?.get(PlatformRef) ?? null;
}
/**
 * The Angular platform is the entry point for Angular on a web page.
 * Each page has exactly one platform. Services (such as reflection) which are common
 * to every Angular application running on the page are bound in its scope.
 * A page's platform is initialized implicitly when a platform is created using a platform
 * factory such as `PlatformBrowser`, or explicitly by calling the `createPlatform()` function.
 *
 * @publicApi
 */
export class PlatformRef {
    /** @internal */
    constructor(_injector) {
        this._injector = _injector;
        this._modules = [];
        this._destroyListeners = [];
        this._destroyed = false;
    }
    /**
     * Creates an instance of an `@NgModule` for the given platform.
     *
     * @deprecated Passing NgModule factories as the `PlatformRef.bootstrapModuleFactory` function
     *     argument is deprecated. Use the `PlatformRef.bootstrapModule` API instead.
     */
    bootstrapModuleFactory(moduleFactory, options) {
        // Note: We need to create the NgZone _before_ we instantiate the module,
        // as instantiating the module creates some providers eagerly.
        // So we create a mini parent injector that just contains the new NgZone and
        // pass that as parent to the NgModuleFactory.
        const ngZone = getNgZone(options?.ngZone, getNgZoneOptions(options));
        const providers = [{ provide: NgZone, useValue: ngZone }];
        // Note: Create ngZoneInjector within ngZone.run so that all of the instantiated services are
        // created within the Angular zone
        // Do not try to replace ngZone.run with ApplicationRef#run because ApplicationRef would then be
        // created outside of the Angular zone.
        return ngZone.run(() => {
            const ngZoneInjector = Injector.create({ providers: providers, parent: this.injector, name: moduleFactory.moduleType.name });
            const moduleRef = moduleFactory.create(ngZoneInjector);
            const exceptionHandler = moduleRef.injector.get(ErrorHandler, null);
            if (!exceptionHandler) {
                throw new RuntimeError(402 /* RuntimeErrorCode.ERROR_HANDLER_NOT_FOUND */, ngDevMode && 'No ErrorHandler. Is platform module (BrowserModule) included?');
            }
            ngZone.runOutsideAngular(() => {
                const subscription = ngZone.onError.subscribe({
                    next: (error) => {
                        exceptionHandler.handleError(error);
                    }
                });
                moduleRef.onDestroy(() => {
                    remove(this._modules, moduleRef);
                    subscription.unsubscribe();
                });
            });
            return _callAndReportToErrorHandler(exceptionHandler, ngZone, () => {
                const initStatus = moduleRef.injector.get(ApplicationInitStatus);
                initStatus.runInitializers();
                return initStatus.donePromise.then(() => {
                    // If the `LOCALE_ID` provider is defined at bootstrap then we set the value for ivy
                    const localeId = moduleRef.injector.get(LOCALE_ID, DEFAULT_LOCALE_ID);
                    setLocaleId(localeId || DEFAULT_LOCALE_ID);
                    this._moduleDoBootstrap(moduleRef);
                    return moduleRef;
                });
            });
        });
    }
    /**
     * Creates an instance of an `@NgModule` for a given platform.
     *
     * @usageNotes
     * ### Simple Example
     *
     * ```typescript
     * @NgModule({
     *   imports: [BrowserModule]
     * })
     * class MyModule {}
     *
     * let moduleRef = platformBrowser().bootstrapModule(MyModule);
     * ```
     *
     */
    bootstrapModule(moduleType, compilerOptions = []) {
        const options = optionsReducer({}, compilerOptions);
        return compileNgModuleFactory(this.injector, options, moduleType)
            .then(moduleFactory => this.bootstrapModuleFactory(moduleFactory, options));
    }
    _moduleDoBootstrap(moduleRef) {
        const appRef = moduleRef.injector.get(ApplicationRef);
        if (moduleRef._bootstrapComponents.length > 0) {
            moduleRef._bootstrapComponents.forEach(f => appRef.bootstrap(f));
        }
        else if (moduleRef.instance.ngDoBootstrap) {
            moduleRef.instance.ngDoBootstrap(appRef);
        }
        else {
            throw new RuntimeError(403 /* RuntimeErrorCode.BOOTSTRAP_COMPONENTS_NOT_FOUND */, ngDevMode &&
                `The module ${stringify(moduleRef.instance.constructor)} was bootstrapped, ` +
                    `but it does not declare "@NgModule.bootstrap" components nor a "ngDoBootstrap" method. ` +
                    `Please define one of these.`);
        }
        this._modules.push(moduleRef);
    }
    /**
     * Registers a listener to be called when the platform is destroyed.
     */
    onDestroy(callback) {
        this._destroyListeners.push(callback);
    }
    /**
     * Retrieves the platform {@link Injector}, which is the parent injector for
     * every Angular application on the page and provides singleton providers.
     */
    get injector() {
        return this._injector;
    }
    /**
     * Destroys the current Angular platform and all Angular applications on the page.
     * Destroys all modules and listeners registered with the platform.
     */
    destroy() {
        if (this._destroyed) {
            throw new RuntimeError(404 /* RuntimeErrorCode.PLATFORM_ALREADY_DESTROYED */, ngDevMode && 'The platform has already been destroyed!');
        }
        this._modules.slice().forEach(module => module.destroy());
        this._destroyListeners.forEach(listener => listener());
        const destroyListeners = this._injector.get(PLATFORM_DESTROY_LISTENERS, null);
        if (destroyListeners) {
            destroyListeners.forEach(listener => listener());
            destroyListeners.clear();
        }
        this._destroyed = true;
    }
    /**
     * Indicates whether this instance was destroyed.
     */
    get destroyed() {
        return this._destroyed;
    }
}
PlatformRef.ɵfac = function PlatformRef_Factory(t) { return new (t || PlatformRef)(i0.ɵɵinject(i1.Injector)); };
PlatformRef.ɵprov = /*@__PURE__*/ i0.ɵɵdefineInjectable({ token: PlatformRef, factory: PlatformRef.ɵfac, providedIn: 'platform' });
(function () { (typeof ngDevMode === "undefined" || ngDevMode) && i0.setClassMetadata(PlatformRef, [{
        type: Injectable,
        args: [{ providedIn: 'platform' }]
    }], function () { return [{ type: i1.Injector }]; }, null); })();
// Transforms a set of `BootstrapOptions` (supported by the NgModule-based bootstrap APIs) ->
// `NgZoneOptions` that are recognized by the NgZone constructor. Passing no options will result in
// a set of default options returned.
function getNgZoneOptions(options) {
    return {
        enableLongStackTrace: typeof ngDevMode === 'undefined' ? false : !!ngDevMode,
        shouldCoalesceEventChangeDetection: !!(options && options.ngZoneEventCoalescing) || false,
        shouldCoalesceRunChangeDetection: !!(options && options.ngZoneRunCoalescing) || false,
    };
}
function getNgZone(ngZoneToUse, options) {
    let ngZone;
    if (ngZoneToUse === 'noop') {
        ngZone = new NoopNgZone();
    }
    else {
        ngZone = (ngZoneToUse === 'zone.js' ? undefined : ngZoneToUse) || new NgZone(options);
    }
    return ngZone;
}
function _callAndReportToErrorHandler(errorHandler, ngZone, callback) {
    try {
        const result = callback();
        if (isPromise(result)) {
            return result.catch((e) => {
                ngZone.runOutsideAngular(() => errorHandler.handleError(e));
                // rethrow as the exception handler might not do it
                throw e;
            });
        }
        return result;
    }
    catch (e) {
        ngZone.runOutsideAngular(() => errorHandler.handleError(e));
        // rethrow as the exception handler might not do it
        throw e;
    }
}
function optionsReducer(dst, objs) {
    if (Array.isArray(objs)) {
        dst = objs.reduce(optionsReducer, dst);
    }
    else {
        dst = { ...dst, ...objs };
    }
    return dst;
}
/**
 * A reference to an Angular application running on a page.
 *
 * @usageNotes
 *
 * {@a is-stable-examples}
 * ### isStable examples and caveats
 *
 * Note two important points about `isStable`, demonstrated in the examples below:
 * - the application will never be stable if you start any kind
 * of recurrent asynchronous task when the application starts
 * (for example for a polling process, started with a `setInterval`, a `setTimeout`
 * or using RxJS operators like `interval`);
 * - the `isStable` Observable runs outside of the Angular zone.
 *
 * Let's imagine that you start a recurrent task
 * (here incrementing a counter, using RxJS `interval`),
 * and at the same time subscribe to `isStable`.
 *
 * ```
 * constructor(appRef: ApplicationRef) {
 *   appRef.isStable.pipe(
 *      filter(stable => stable)
 *   ).subscribe(() => console.log('App is stable now');
 *   interval(1000).subscribe(counter => console.log(counter));
 * }
 * ```
 * In this example, `isStable` will never emit `true`,
 * and the trace "App is stable now" will never get logged.
 *
 * If you want to execute something when the app is stable,
 * you have to wait for the application to be stable
 * before starting your polling process.
 *
 * ```
 * constructor(appRef: ApplicationRef) {
 *   appRef.isStable.pipe(
 *     first(stable => stable),
 *     tap(stable => console.log('App is stable now')),
 *     switchMap(() => interval(1000))
 *   ).subscribe(counter => console.log(counter));
 * }
 * ```
 * In this example, the trace "App is stable now" will be logged
 * and then the counter starts incrementing every second.
 *
 * Note also that this Observable runs outside of the Angular zone,
 * which means that the code in the subscription
 * to this Observable will not trigger the change detection.
 *
 * Let's imagine that instead of logging the counter value,
 * you update a field of your component
 * and display it in its template.
 *
 * ```
 * constructor(appRef: ApplicationRef) {
 *   appRef.isStable.pipe(
 *     first(stable => stable),
 *     switchMap(() => interval(1000))
 *   ).subscribe(counter => this.value = counter);
 * }
 * ```
 * As the `isStable` Observable runs outside the zone,
 * the `value` field will be updated properly,
 * but the template will not be refreshed!
 *
 * You'll have to manually trigger the change detection to update the template.
 *
 * ```
 * constructor(appRef: ApplicationRef, cd: ChangeDetectorRef) {
 *   appRef.isStable.pipe(
 *     first(stable => stable),
 *     switchMap(() => interval(1000))
 *   ).subscribe(counter => {
 *     this.value = counter;
 *     cd.detectChanges();
 *   });
 * }
 * ```
 *
 * Or make the subscription callback run inside the zone.
 *
 * ```
 * constructor(appRef: ApplicationRef, zone: NgZone) {
 *   appRef.isStable.pipe(
 *     first(stable => stable),
 *     switchMap(() => interval(1000))
 *   ).subscribe(counter => zone.run(() => this.value = counter));
 * }
 * ```
 *
 * @publicApi
 */
export class ApplicationRef {
    /** @internal */
    constructor(_zone, _injector, _exceptionHandler) {
        this._zone = _zone;
        this._injector = _injector;
        this._exceptionHandler = _exceptionHandler;
        /** @internal */
        this._bootstrapListeners = [];
        this._views = [];
        this._runningTick = false;
        this._stable = true;
        this._destroyed = false;
        this._destroyListeners = [];
        /**
         * Get a list of component types registered to this application.
         * This list is populated even before the component is created.
         */
        this.componentTypes = [];
        /**
         * Get a list of components registered to this application.
         */
        this.components = [];
        this._onMicrotaskEmptySubscription = this._zone.onMicrotaskEmpty.subscribe({
            next: () => {
                this._zone.run(() => {
                    this.tick();
                });
            }
        });
        const isCurrentlyStable = new Observable((observer) => {
            this._stable = this._zone.isStable && !this._zone.hasPendingMacrotasks &&
                !this._zone.hasPendingMicrotasks;
            this._zone.runOutsideAngular(() => {
                observer.next(this._stable);
                observer.complete();
            });
        });
        const isStable = new Observable((observer) => {
            // Create the subscription to onStable outside the Angular Zone so that
            // the callback is run outside the Angular Zone.
            let stableSub;
            this._zone.runOutsideAngular(() => {
                stableSub = this._zone.onStable.subscribe(() => {
                    NgZone.assertNotInAngularZone();
                    // Check whether there are no pending macro/micro tasks in the next tick
                    // to allow for NgZone to update the state.
                    scheduleMicroTask(() => {
                        if (!this._stable && !this._zone.hasPendingMacrotasks &&
                            !this._zone.hasPendingMicrotasks) {
                            this._stable = true;
                            observer.next(true);
                        }
                    });
                });
            });
            const unstableSub = this._zone.onUnstable.subscribe(() => {
                NgZone.assertInAngularZone();
                if (this._stable) {
                    this._stable = false;
                    this._zone.runOutsideAngular(() => {
                        observer.next(false);
                    });
                }
            });
            return () => {
                stableSub.unsubscribe();
                unstableSub.unsubscribe();
            };
        });
        this.isStable =
            merge(isCurrentlyStable, isStable.pipe(share()));
    }
    /**
     * Indicates whether this instance was destroyed.
     */
    get destroyed() {
        return this._destroyed;
    }
    /**
     * The `EnvironmentInjector` used to create this application.
     */
    get injector() {
        return this._injector;
    }
    /**
     * Bootstrap a component onto the element identified by its selector or, optionally, to a
     * specified element.
     *
     * @usageNotes
     * ### Bootstrap process
     *
     * When bootstrapping a component, Angular mounts it onto a target DOM element
     * and kicks off automatic change detection. The target DOM element can be
     * provided using the `rootSelectorOrNode` argument.
     *
     * If the target DOM element is not provided, Angular tries to find one on a page
     * using the `selector` of the component that is being bootstrapped
     * (first matched element is used).
     *
     * ### Example
     *
     * Generally, we define the component to bootstrap in the `bootstrap` array of `NgModule`,
     * but it requires us to know the component while writing the application code.
     *
     * Imagine a situation where we have to wait for an API call to decide about the component to
     * bootstrap. We can use the `ngDoBootstrap` hook of the `NgModule` and call this method to
     * dynamically bootstrap a component.
     *
     * {@example core/ts/platform/platform.ts region='componentSelector'}
     *
     * Optionally, a component can be mounted onto a DOM element that does not match the
     * selector of the bootstrapped component.
     *
     * In the following example, we are providing a CSS selector to match the target element.
     *
     * {@example core/ts/platform/platform.ts region='cssSelector'}
     *
     * While in this example, we are providing reference to a DOM node.
     *
     * {@example core/ts/platform/platform.ts region='domNode'}
     */
    bootstrap(componentOrFactory, rootSelectorOrNode) {
        NG_DEV_MODE && this.warnIfDestroyed();
        const isComponentFactory = componentOrFactory instanceof ComponentFactory;
        const initStatus = this._injector.get(ApplicationInitStatus);
        if (!initStatus.done) {
            const standalone = !isComponentFactory && isStandalone(componentOrFactory);
            const errorMessage = 'Cannot bootstrap as there are still asynchronous initializers running.' +
                (standalone ? '' :
                    ' Bootstrap components in the `ngDoBootstrap` method of the root module.');
            throw new RuntimeError(405 /* RuntimeErrorCode.ASYNC_INITIALIZERS_STILL_RUNNING */, NG_DEV_MODE && errorMessage);
        }
        let componentFactory;
        if (isComponentFactory) {
            componentFactory = componentOrFactory;
        }
        else {
            const resolver = this._injector.get(ComponentFactoryResolver);
            componentFactory = resolver.resolveComponentFactory(componentOrFactory);
        }
        this.componentTypes.push(componentFactory.componentType);
        // Create a factory associated with the current module if it's not bound to some other
        const ngModule = isBoundToModule(componentFactory) ? undefined : this._injector.get(NgModuleRef);
        const selectorOrNode = rootSelectorOrNode || componentFactory.selector;
        const compRef = componentFactory.create(Injector.NULL, [], selectorOrNode, ngModule);
        const nativeElement = compRef.location.nativeElement;
        const testability = compRef.injector.get(TESTABILITY, null);
        testability?.registerApplication(nativeElement);
        compRef.onDestroy(() => {
            this.detachView(compRef.hostView);
            remove(this.components, compRef);
            testability?.unregisterApplication(nativeElement);
        });
        this._loadComponent(compRef);
        if (typeof ngDevMode === 'undefined' || ngDevMode) {
            const _console = this._injector.get(Console);
            _console.log(`Angular is running in development mode. Call enableProdMode() to enable production mode.`);
        }
        return compRef;
    }
    /**
     * Invoke this method to explicitly process change detection and its side-effects.
     *
     * In development mode, `tick()` also performs a second change detection cycle to ensure that no
     * further changes are detected. If additional changes are picked up during this second cycle,
     * bindings in the app have side-effects that cannot be resolved in a single change detection
     * pass.
     * In this case, Angular throws an error, since an Angular application can only have one change
     * detection pass during which all change detection must complete.
     */
    tick() {
        NG_DEV_MODE && this.warnIfDestroyed();
        if (this._runningTick) {
            throw new RuntimeError(101 /* RuntimeErrorCode.RECURSIVE_APPLICATION_REF_TICK */, ngDevMode && 'ApplicationRef.tick is called recursively');
        }
        try {
            this._runningTick = true;
            for (let view of this._views) {
                view.detectChanges();
            }
            if (typeof ngDevMode === 'undefined' || ngDevMode) {
                for (let view of this._views) {
                    view.checkNoChanges();
                }
            }
        }
        catch (e) {
            // Attention: Don't rethrow as it could cancel subscriptions to Observables!
            this._zone.runOutsideAngular(() => this._exceptionHandler.handleError(e));
        }
        finally {
            this._runningTick = false;
        }
    }
    /**
     * Attaches a view so that it will be dirty checked.
     * The view will be automatically detached when it is destroyed.
     * This will throw if the view is already attached to a ViewContainer.
     */
    attachView(viewRef) {
        NG_DEV_MODE && this.warnIfDestroyed();
        const view = viewRef;
        this._views.push(view);
        view.attachToAppRef(this);
    }
    /**
     * Detaches a view from dirty checking again.
     */
    detachView(viewRef) {
        NG_DEV_MODE && this.warnIfDestroyed();
        const view = viewRef;
        remove(this._views, view);
        view.detachFromAppRef();
    }
    _loadComponent(componentRef) {
        this.attachView(componentRef.hostView);
        this.tick();
        this.components.push(componentRef);
        // Get the listeners lazily to prevent DI cycles.
        const listeners = this._injector.get(APP_BOOTSTRAP_LISTENER, []).concat(this._bootstrapListeners);
        listeners.forEach((listener) => listener(componentRef));
    }
    /** @internal */
    ngOnDestroy() {
        if (this._destroyed)
            return;
        try {
            // Call all the lifecycle hooks.
            this._destroyListeners.forEach(listener => listener());
            // Destroy all registered views.
            this._views.slice().forEach((view) => view.destroy());
            this._onMicrotaskEmptySubscription.unsubscribe();
        }
        finally {
            // Indicate that this instance is destroyed.
            this._destroyed = true;
            // Release all references.
            this._views = [];
            this._bootstrapListeners = [];
            this._destroyListeners = [];
        }
    }
    /**
     * Registers a listener to be called when an instance is destroyed.
     *
     * @param callback A callback function to add as a listener.
     * @returns A function which unregisters a listener.
     *
     * @internal
     */
    onDestroy(callback) {
        NG_DEV_MODE && this.warnIfDestroyed();
        this._destroyListeners.push(callback);
        return () => remove(this._destroyListeners, callback);
    }
    /**
     * Destroys an Angular application represented by this `ApplicationRef`. Calling this function
     * will destroy the associated environment injectors as well as all the bootstrapped components
     * with their views.
     */
    destroy() {
        if (this._destroyed) {
            throw new RuntimeError(406 /* RuntimeErrorCode.APPLICATION_REF_ALREADY_DESTROYED */, ngDevMode && 'This instance of the `ApplicationRef` has already been destroyed.');
        }
        const injector = this._injector;
        // Check that this injector instance supports destroy operation.
        if (injector.destroy && !injector.destroyed) {
            // Destroying an underlying injector will trigger the `ngOnDestroy` lifecycle
            // hook, which invokes the remaining cleanup actions.
            injector.destroy();
        }
    }
    /**
     * Returns the number of attached views.
     */
    get viewCount() {
        return this._views.length;
    }
    warnIfDestroyed() {
        if (NG_DEV_MODE && this._destroyed) {
            console.warn(formatRuntimeError(406 /* RuntimeErrorCode.APPLICATION_REF_ALREADY_DESTROYED */, 'This instance of the `ApplicationRef` has already been destroyed.'));
        }
    }
}
ApplicationRef.ɵfac = function ApplicationRef_Factory(t) { return new (t || ApplicationRef)(i0.ɵɵinject(i2.NgZone), i0.ɵɵinject(i3.EnvironmentInjector), i0.ɵɵinject(i4.ErrorHandler)); };
ApplicationRef.ɵprov = /*@__PURE__*/ i0.ɵɵdefineInjectable({ token: ApplicationRef, factory: ApplicationRef.ɵfac, providedIn: 'root' });
(function () { (typeof ngDevMode === "undefined" || ngDevMode) && i0.setClassMetadata(ApplicationRef, [{
        type: Injectable,
        args: [{ providedIn: 'root' }]
    }], function () { return [{ type: i2.NgZone }, { type: i3.EnvironmentInjector }, { type: i4.ErrorHandler }]; }, null); })();
function remove(list, el) {
    const index = list.indexOf(el);
    if (index > -1) {
        list.splice(index, 1);
    }
}
function _lastDefined(args) {
    for (let i = args.length - 1; i >= 0; i--) {
        if (args[i] !== undefined) {
            return args[i];
        }
    }
    return undefined;
}
function _mergeArrays(parts) {
    const result = [];
    parts.forEach((part) => part && result.push(...part));
    return result;
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport './util/ng_jit_mode';\n\nimport {merge, Observable, Observer, Subscription} from 'rxjs';\nimport {share} from 'rxjs/operators';\n\nimport {ApplicationInitStatus} from './application_init';\nimport {APP_BOOTSTRAP_LISTENER, PLATFORM_INITIALIZER} from './application_tokens';\nimport {getCompilerFacade, JitCompilerUsage} from './compiler/compiler_facade';\nimport {Console} from './console';\nimport {Injectable} from './di/injectable';\nimport {InjectionToken} from './di/injection_token';\nimport {Injector} from './di/injector';\nimport {ImportedNgModuleProviders, Provider, StaticProvider} from './di/interface/provider';\nimport {EnvironmentInjector} from './di/r3_injector';\nimport {INJECTOR_SCOPE} from './di/scope';\nimport {ErrorHandler} from './error_handler';\nimport {formatRuntimeError, RuntimeError, RuntimeErrorCode} from './errors';\nimport {DEFAULT_LOCALE_ID} from './i18n/localization';\nimport {LOCALE_ID} from './i18n/tokens';\nimport {Type} from './interface/type';\nimport {COMPILER_OPTIONS, CompilerOptions} from './linker/compiler';\nimport {ComponentFactory, ComponentRef} from './linker/component_factory';\nimport {ComponentFactoryResolver} from './linker/component_factory_resolver';\nimport {InternalNgModuleRef, NgModuleFactory, NgModuleRef} from './linker/ng_module_factory';\nimport {InternalViewRef, ViewRef} from './linker/view_ref';\nimport {isComponentResourceResolutionQueueEmpty, resolveComponentResources} from './metadata/resource_loading';\nimport {assertNgModuleType} from './render3/assert';\nimport {ComponentFactory as R3ComponentFactory} from './render3/component_ref';\nimport {isStandalone} from './render3/definition';\nimport {assertStandaloneComponentType} from './render3/errors';\nimport {setLocaleId} from './render3/i18n/i18n_locale_id';\nimport {setJitOptions} from './render3/jit/jit_options';\nimport {createEnvironmentInjector, NgModuleFactory as R3NgModuleFactory} from './render3/ng_module_ref';\nimport {publishDefaultGlobalUtils as _publishDefaultGlobalUtils} from './render3/util/global_utils';\nimport {TESTABILITY} from './testability/testability';\nimport {isPromise} from './util/lang';\nimport {scheduleMicroTask} from './util/microtask';\nimport {stringify} from './util/stringify';\nimport {NgZone, NoopNgZone} from './zone/ng_zone';\n\nlet _platformInjector: Injector|null = null;\n\n/**\n * Internal token to indicate whether having multiple bootstrapped platform should be allowed (only\n * one bootstrapped platform is allowed by default). This token helps to support SSR scenarios.\n */\nexport const ALLOW_MULTIPLE_PLATFORMS = new InjectionToken<boolean>('AllowMultipleToken');\n\n/**\n * Internal token that allows to register extra callbacks that should be invoked during the\n * `PlatformRef.destroy` operation. This token is needed to avoid a direct reference to the\n * `PlatformRef` class (i.e. register the callback via `PlatformRef.onDestroy`), thus making the\n * entire class tree-shakeable.\n */\nconst PLATFORM_DESTROY_LISTENERS =\n    new InjectionToken<Set<VoidFunction>>('PlatformDestroyListeners');\n\nconst NG_DEV_MODE = typeof ngDevMode === 'undefined' || ngDevMode;\n\nexport function compileNgModuleFactory<M>(\n    injector: Injector, options: CompilerOptions,\n    moduleType: Type<M>): Promise<NgModuleFactory<M>> {\n  ngDevMode && assertNgModuleType(moduleType);\n\n  const moduleFactory = new R3NgModuleFactory(moduleType);\n\n  // All of the logic below is irrelevant for AOT-compiled code.\n  if (typeof ngJitMode !== 'undefined' && !ngJitMode) {\n    return Promise.resolve(moduleFactory);\n  }\n\n  const compilerOptions = injector.get(COMPILER_OPTIONS, []).concat(options);\n\n  // Configure the compiler to use the provided options. This call may fail when multiple modules\n  // are bootstrapped with incompatible options, as a component can only be compiled according to\n  // a single set of options.\n  setJitOptions({\n    defaultEncapsulation: _lastDefined(compilerOptions.map(opts => opts.defaultEncapsulation)),\n    preserveWhitespaces: _lastDefined(compilerOptions.map(opts => opts.preserveWhitespaces)),\n  });\n\n  if (isComponentResourceResolutionQueueEmpty()) {\n    return Promise.resolve(moduleFactory);\n  }\n\n  const compilerProviders = _mergeArrays(compilerOptions.map(o => o.providers!));\n\n  // In case there are no compiler providers, we just return the module factory as\n  // there won't be any resource loader. This can happen with Ivy, because AOT compiled\n  // modules can be still passed through \"bootstrapModule\". In that case we shouldn't\n  // unnecessarily require the JIT compiler.\n  if (compilerProviders.length === 0) {\n    return Promise.resolve(moduleFactory);\n  }\n\n  const compiler = getCompilerFacade({\n    usage: JitCompilerUsage.Decorator,\n    kind: 'NgModule',\n    type: moduleType,\n  });\n  const compilerInjector = Injector.create({providers: compilerProviders});\n  const resourceLoader = compilerInjector.get(compiler.ResourceLoader);\n  // The resource loader can also return a string while the \"resolveComponentResources\"\n  // always expects a promise. Therefore we need to wrap the returned value in a promise.\n  return resolveComponentResources(url => Promise.resolve(resourceLoader.get(url)))\n      .then(() => moduleFactory);\n}\n\nexport function publishDefaultGlobalUtils() {\n  ngDevMode && _publishDefaultGlobalUtils();\n}\n\nexport function isBoundToModule<C>(cf: ComponentFactory<C>): boolean {\n  return (cf as R3ComponentFactory<C>).isBoundToModule;\n}\n\n/**\n * A token for third-party components that can register themselves with NgProbe.\n *\n * @publicApi\n */\nexport class NgProbeToken {\n  constructor(public name: string, public token: any) {}\n}\n\n/**\n * Creates a platform.\n * Platforms must be created on launch using this function.\n *\n * @publicApi\n */\nexport function createPlatform(injector: Injector): PlatformRef {\n  if (_platformInjector && !_platformInjector.get(ALLOW_MULTIPLE_PLATFORMS, false)) {\n    throw new RuntimeError(\n        RuntimeErrorCode.MULTIPLE_PLATFORMS,\n        ngDevMode &&\n            'There can be only one platform. Destroy the previous one to create a new one.');\n  }\n  publishDefaultGlobalUtils();\n  _platformInjector = injector;\n  const platform = injector.get(PlatformRef);\n  runPlatformInitializers(injector);\n  return platform;\n}\n\n/**\n * The goal of this function is to bootstrap a platform injector,\n * but avoid referencing `PlatformRef` class.\n * This function is needed for bootstrapping a Standalone Component.\n */\nexport function createOrReusePlatformInjector(providers: StaticProvider[] = []): Injector {\n  // If a platform injector already exists, it means that the platform\n  // is already bootstrapped and no additional actions are required.\n  if (_platformInjector) return _platformInjector;\n\n  // Otherwise, setup a new platform injector and run platform initializers.\n  const injector = createPlatformInjector(providers);\n  _platformInjector = injector;\n  publishDefaultGlobalUtils();\n  runPlatformInitializers(injector);\n  return injector;\n}\n\nexport function runPlatformInitializers(injector: Injector): void {\n  const inits = injector.get(PLATFORM_INITIALIZER, null);\n  if (inits) {\n    inits.forEach((init: any) => init());\n  }\n}\n\n/**\n * Internal create application API that implements the core application creation logic and optional\n * bootstrap logic.\n *\n * Platforms (such as `platform-browser`) may require different set of application and platform\n * providers for an application to function correctly. As a result, platforms may use this function\n * internally and supply the necessary providers during the bootstrap, while exposing\n * platform-specific APIs as a part of their public API.\n *\n * @returns A promise that returns an `ApplicationRef` instance once resolved.\n */\nexport function internalCreateApplication(config: {\n  rootComponent?: Type<unknown>,\n  appProviders?: Array<Provider|ImportedNgModuleProviders>,\n  platformProviders?: Provider[],\n}): Promise<ApplicationRef> {\n  const {rootComponent, appProviders, platformProviders} = config;\n\n  if (NG_DEV_MODE && rootComponent !== undefined) {\n    assertStandaloneComponentType(rootComponent);\n  }\n\n  const platformInjector = createOrReusePlatformInjector(platformProviders as StaticProvider[]);\n\n  const ngZone = getNgZone('zone.js', getNgZoneOptions());\n\n  return ngZone.run(() => {\n    // Create root application injector based on a set of providers configured at the platform\n    // bootstrap level as well as providers passed to the bootstrap call by a user.\n    const allAppProviders = [\n      {provide: NgZone, useValue: ngZone},  //\n      ...(appProviders || []),              //\n    ];\n\n    const envInjector = createEnvironmentInjector(\n        allAppProviders, platformInjector as EnvironmentInjector, 'Environment Injector');\n\n    const exceptionHandler: ErrorHandler|null = envInjector.get(ErrorHandler, null);\n    if (NG_DEV_MODE && !exceptionHandler) {\n      throw new RuntimeError(\n          RuntimeErrorCode.ERROR_HANDLER_NOT_FOUND,\n          'No `ErrorHandler` found in the Dependency Injection tree.');\n    }\n\n    let onErrorSubscription: Subscription;\n    ngZone.runOutsideAngular(() => {\n      onErrorSubscription = ngZone.onError.subscribe({\n        next: (error: any) => {\n          exceptionHandler!.handleError(error);\n        }\n      });\n    });\n\n    // If the whole platform is destroyed, invoke the `destroy` method\n    // for all bootstrapped applications as well.\n    const destroyListener = () => envInjector.destroy();\n    const onPlatformDestroyListeners = platformInjector.get(PLATFORM_DESTROY_LISTENERS);\n    onPlatformDestroyListeners.add(destroyListener);\n\n    envInjector.onDestroy(() => {\n      onErrorSubscription.unsubscribe();\n      onPlatformDestroyListeners.delete(destroyListener);\n    });\n\n    return _callAndReportToErrorHandler(exceptionHandler!, ngZone, () => {\n      const initStatus = envInjector.get(ApplicationInitStatus);\n      initStatus.runInitializers();\n\n      return initStatus.donePromise.then(() => {\n        const localeId = envInjector.get(LOCALE_ID, DEFAULT_LOCALE_ID);\n        setLocaleId(localeId || DEFAULT_LOCALE_ID);\n\n        const appRef = envInjector.get(ApplicationRef);\n        if (rootComponent !== undefined) {\n          appRef.bootstrap(rootComponent);\n        }\n        return appRef;\n      });\n    });\n  });\n}\n\n/**\n * Creates a factory for a platform. Can be used to provide or override `Providers` specific to\n * your application's runtime needs, such as `PLATFORM_INITIALIZER` and `PLATFORM_ID`.\n * @param parentPlatformFactory Another platform factory to modify. Allows you to compose factories\n * to build up configurations that might be required by different libraries or parts of the\n * application.\n * @param name Identifies the new platform factory.\n * @param providers A set of dependency providers for platforms created with the new factory.\n *\n * @publicApi\n */\nexport function createPlatformFactory(\n    parentPlatformFactory: ((extraProviders?: StaticProvider[]) => PlatformRef)|null, name: string,\n    providers: StaticProvider[] = []): (extraProviders?: StaticProvider[]) => PlatformRef {\n  const desc = `Platform: ${name}`;\n  const marker = new InjectionToken(desc);\n  return (extraProviders: StaticProvider[] = []) => {\n    let platform = getPlatform();\n    if (!platform || platform.injector.get(ALLOW_MULTIPLE_PLATFORMS, false)) {\n      const platformProviders: StaticProvider[] = [\n        ...providers,       //\n        ...extraProviders,  //\n        {provide: marker, useValue: true}\n      ];\n      if (parentPlatformFactory) {\n        parentPlatformFactory(platformProviders);\n      } else {\n        createPlatform(createPlatformInjector(platformProviders, desc));\n      }\n    }\n    return assertPlatform(marker);\n  };\n}\n\n/**\n * Checks that there is currently a platform that contains the given token as a provider.\n *\n * @publicApi\n */\nexport function assertPlatform(requiredToken: any): PlatformRef {\n  const platform = getPlatform();\n\n  if (!platform) {\n    throw new RuntimeError(RuntimeErrorCode.PLATFORM_NOT_FOUND, ngDevMode && 'No platform exists!');\n  }\n\n  if ((typeof ngDevMode === 'undefined' || ngDevMode) &&\n      !platform.injector.get(requiredToken, null)) {\n    throw new RuntimeError(\n        RuntimeErrorCode.MULTIPLE_PLATFORMS,\n        'A platform with a different configuration has been created. Please destroy it first.');\n  }\n\n  return platform;\n}\n\n/**\n * Helper function to create an instance of a platform injector (that maintains the 'platform'\n * scope).\n */\nexport function createPlatformInjector(providers: StaticProvider[] = [], name?: string): Injector {\n  return Injector.create({\n    name,\n    providers: [\n      {provide: INJECTOR_SCOPE, useValue: 'platform'},\n      {provide: PLATFORM_DESTROY_LISTENERS, useValue: new Set([() => _platformInjector = null])},\n      ...providers\n    ],\n  });\n}\n\n/**\n * Destroys the current Angular platform and all Angular applications on the page.\n * Destroys all modules and listeners registered with the platform.\n *\n * @publicApi\n */\nexport function destroyPlatform(): void {\n  getPlatform()?.destroy();\n}\n\n/**\n * Returns the current platform.\n *\n * @publicApi\n */\nexport function getPlatform(): PlatformRef|null {\n  return _platformInjector?.get(PlatformRef) ?? null;\n}\n\n/**\n * Provides additional options to the bootstrapping process.\n *\n * @publicApi\n */\nexport interface BootstrapOptions {\n  /**\n   * Optionally specify which `NgZone` should be used.\n   *\n   * - Provide your own `NgZone` instance.\n   * - `zone.js` - Use default `NgZone` which requires `Zone.js`.\n   * - `noop` - Use `NoopNgZone` which does nothing.\n   */\n  ngZone?: NgZone|'zone.js'|'noop';\n\n  /**\n   * Optionally specify coalescing event change detections or not.\n   * Consider the following case.\n   *\n   * <div (click)=\"doSomething()\">\n   *   <button (click)=\"doSomethingElse()\"></button>\n   * </div>\n   *\n   * When button is clicked, because of the event bubbling, both\n   * event handlers will be called and 2 change detections will be\n   * triggered. We can coalesce such kind of events to only trigger\n   * change detection only once.\n   *\n   * By default, this option will be false. So the events will not be\n   * coalesced and the change detection will be triggered multiple times.\n   * And if this option be set to true, the change detection will be\n   * triggered async by scheduling a animation frame. So in the case above,\n   * the change detection will only be triggered once.\n   */\n  ngZoneEventCoalescing?: boolean;\n\n  /**\n   * Optionally specify if `NgZone#run()` method invocations should be coalesced\n   * into a single change detection.\n   *\n   * Consider the following case.\n   *\n   * for (let i = 0; i < 10; i ++) {\n   *   ngZone.run(() => {\n   *     // do something\n   *   });\n   * }\n   *\n   * This case triggers the change detection multiple times.\n   * With ngZoneRunCoalescing options, all change detections in an event loop trigger only once.\n   * In addition, the change detection executes in requestAnimation.\n   *\n   */\n  ngZoneRunCoalescing?: boolean;\n}\n\n/**\n * The Angular platform is the entry point for Angular on a web page.\n * Each page has exactly one platform. Services (such as reflection) which are common\n * to every Angular application running on the page are bound in its scope.\n * A page's platform is initialized implicitly when a platform is created using a platform\n * factory such as `PlatformBrowser`, or explicitly by calling the `createPlatform()` function.\n *\n * @publicApi\n */\n@Injectable({providedIn: 'platform'})\nexport class PlatformRef {\n  private _modules: NgModuleRef<any>[] = [];\n  private _destroyListeners: Array<() => void> = [];\n  private _destroyed: boolean = false;\n\n  /** @internal */\n  constructor(private _injector: Injector) {}\n\n  /**\n   * Creates an instance of an `@NgModule` for the given platform.\n   *\n   * @deprecated Passing NgModule factories as the `PlatformRef.bootstrapModuleFactory` function\n   *     argument is deprecated. Use the `PlatformRef.bootstrapModule` API instead.\n   */\n  bootstrapModuleFactory<M>(moduleFactory: NgModuleFactory<M>, options?: BootstrapOptions):\n      Promise<NgModuleRef<M>> {\n    // Note: We need to create the NgZone _before_ we instantiate the module,\n    // as instantiating the module creates some providers eagerly.\n    // So we create a mini parent injector that just contains the new NgZone and\n    // pass that as parent to the NgModuleFactory.\n    const ngZone = getNgZone(options?.ngZone, getNgZoneOptions(options));\n    const providers: StaticProvider[] = [{provide: NgZone, useValue: ngZone}];\n    // Note: Create ngZoneInjector within ngZone.run so that all of the instantiated services are\n    // created within the Angular zone\n    // Do not try to replace ngZone.run with ApplicationRef#run because ApplicationRef would then be\n    // created outside of the Angular zone.\n    return ngZone.run(() => {\n      const ngZoneInjector = Injector.create(\n          {providers: providers, parent: this.injector, name: moduleFactory.moduleType.name});\n      const moduleRef = <InternalNgModuleRef<M>>moduleFactory.create(ngZoneInjector);\n      const exceptionHandler: ErrorHandler|null = moduleRef.injector.get(ErrorHandler, null);\n      if (!exceptionHandler) {\n        throw new RuntimeError(\n            RuntimeErrorCode.ERROR_HANDLER_NOT_FOUND,\n            ngDevMode && 'No ErrorHandler. Is platform module (BrowserModule) included?');\n      }\n      ngZone!.runOutsideAngular(() => {\n        const subscription = ngZone!.onError.subscribe({\n          next: (error: any) => {\n            exceptionHandler.handleError(error);\n          }\n        });\n        moduleRef.onDestroy(() => {\n          remove(this._modules, moduleRef);\n          subscription.unsubscribe();\n        });\n      });\n      return _callAndReportToErrorHandler(exceptionHandler, ngZone!, () => {\n        const initStatus: ApplicationInitStatus = moduleRef.injector.get(ApplicationInitStatus);\n        initStatus.runInitializers();\n        return initStatus.donePromise.then(() => {\n          // If the `LOCALE_ID` provider is defined at bootstrap then we set the value for ivy\n          const localeId = moduleRef.injector.get(LOCALE_ID, DEFAULT_LOCALE_ID);\n          setLocaleId(localeId || DEFAULT_LOCALE_ID);\n          this._moduleDoBootstrap(moduleRef);\n          return moduleRef;\n        });\n      });\n    });\n  }\n\n  /**\n   * Creates an instance of an `@NgModule` for a given platform.\n   *\n   * @usageNotes\n   * ### Simple Example\n   *\n   * ```typescript\n   * @NgModule({\n   *   imports: [BrowserModule]\n   * })\n   * class MyModule {}\n   *\n   * let moduleRef = platformBrowser().bootstrapModule(MyModule);\n   * ```\n   *\n   */\n  bootstrapModule<M>(\n      moduleType: Type<M>,\n      compilerOptions: (CompilerOptions&BootstrapOptions)|\n      Array<CompilerOptions&BootstrapOptions> = []): Promise<NgModuleRef<M>> {\n    const options = optionsReducer({}, compilerOptions);\n    return compileNgModuleFactory(this.injector, options, moduleType)\n        .then(moduleFactory => this.bootstrapModuleFactory(moduleFactory, options));\n  }\n\n  private _moduleDoBootstrap(moduleRef: InternalNgModuleRef<any>): void {\n    const appRef = moduleRef.injector.get(ApplicationRef);\n    if (moduleRef._bootstrapComponents.length > 0) {\n      moduleRef._bootstrapComponents.forEach(f => appRef.bootstrap(f));\n    } else if (moduleRef.instance.ngDoBootstrap) {\n      moduleRef.instance.ngDoBootstrap(appRef);\n    } else {\n      throw new RuntimeError(\n          RuntimeErrorCode.BOOTSTRAP_COMPONENTS_NOT_FOUND,\n          ngDevMode &&\n              `The module ${stringify(moduleRef.instance.constructor)} was bootstrapped, ` +\n                  `but it does not declare \"@NgModule.bootstrap\" components nor a \"ngDoBootstrap\" method. ` +\n                  `Please define one of these.`);\n    }\n    this._modules.push(moduleRef);\n  }\n\n  /**\n   * Registers a listener to be called when the platform is destroyed.\n   */\n  onDestroy(callback: () => void): void {\n    this._destroyListeners.push(callback);\n  }\n\n  /**\n   * Retrieves the platform {@link Injector}, which is the parent injector for\n   * every Angular application on the page and provides singleton providers.\n   */\n  get injector(): Injector {\n    return this._injector;\n  }\n\n  /**\n   * Destroys the current Angular platform and all Angular applications on the page.\n   * Destroys all modules and listeners registered with the platform.\n   */\n  destroy() {\n    if (this._destroyed) {\n      throw new RuntimeError(\n          RuntimeErrorCode.PLATFORM_ALREADY_DESTROYED,\n          ngDevMode && 'The platform has already been destroyed!');\n    }\n    this._modules.slice().forEach(module => module.destroy());\n    this._destroyListeners.forEach(listener => listener());\n\n    const destroyListeners = this._injector.get(PLATFORM_DESTROY_LISTENERS, null);\n    if (destroyListeners) {\n      destroyListeners.forEach(listener => listener());\n      destroyListeners.clear();\n    }\n\n    this._destroyed = true;\n  }\n\n  /**\n   * Indicates whether this instance was destroyed.\n   */\n  get destroyed() {\n    return this._destroyed;\n  }\n}\n\n// Set of options recognized by the NgZone.\ninterface NgZoneOptions {\n  enableLongStackTrace: boolean;\n  shouldCoalesceEventChangeDetection: boolean;\n  shouldCoalesceRunChangeDetection: boolean;\n}\n\n// Transforms a set of `BootstrapOptions` (supported by the NgModule-based bootstrap APIs) ->\n// `NgZoneOptions` that are recognized by the NgZone constructor. Passing no options will result in\n// a set of default options returned.\nfunction getNgZoneOptions(options?: BootstrapOptions): NgZoneOptions {\n  return {\n    enableLongStackTrace: typeof ngDevMode === 'undefined' ? false : !!ngDevMode,\n    shouldCoalesceEventChangeDetection: !!(options && options.ngZoneEventCoalescing) || false,\n    shouldCoalesceRunChangeDetection: !!(options && options.ngZoneRunCoalescing) || false,\n  };\n}\n\nfunction getNgZone(ngZoneToUse: NgZone|'zone.js'|'noop'|undefined, options: NgZoneOptions): NgZone {\n  let ngZone: NgZone;\n\n  if (ngZoneToUse === 'noop') {\n    ngZone = new NoopNgZone();\n  } else {\n    ngZone = (ngZoneToUse === 'zone.js' ? undefined : ngZoneToUse) || new NgZone(options);\n  }\n  return ngZone;\n}\n\nfunction _callAndReportToErrorHandler(\n    errorHandler: ErrorHandler, ngZone: NgZone, callback: () => any): any {\n  try {\n    const result = callback();\n    if (isPromise(result)) {\n      return result.catch((e: any) => {\n        ngZone.runOutsideAngular(() => errorHandler.handleError(e));\n        // rethrow as the exception handler might not do it\n        throw e;\n      });\n    }\n\n    return result;\n  } catch (e) {\n    ngZone.runOutsideAngular(() => errorHandler.handleError(e));\n    // rethrow as the exception handler might not do it\n    throw e;\n  }\n}\n\nfunction optionsReducer<T extends Object>(dst: any, objs: T|T[]): T {\n  if (Array.isArray(objs)) {\n    dst = objs.reduce(optionsReducer, dst);\n  } else {\n    dst = {...dst, ...(objs as any)};\n  }\n  return dst;\n}\n\n/**\n * A reference to an Angular application running on a page.\n *\n * @usageNotes\n *\n * {@a is-stable-examples}\n * ### isStable examples and caveats\n *\n * Note two important points about `isStable`, demonstrated in the examples below:\n * - the application will never be stable if you start any kind\n * of recurrent asynchronous task when the application starts\n * (for example for a polling process, started with a `setInterval`, a `setTimeout`\n * or using RxJS operators like `interval`);\n * - the `isStable` Observable runs outside of the Angular zone.\n *\n * Let's imagine that you start a recurrent task\n * (here incrementing a counter, using RxJS `interval`),\n * and at the same time subscribe to `isStable`.\n *\n * ```\n * constructor(appRef: ApplicationRef) {\n *   appRef.isStable.pipe(\n *      filter(stable => stable)\n *   ).subscribe(() => console.log('App is stable now');\n *   interval(1000).subscribe(counter => console.log(counter));\n * }\n * ```\n * In this example, `isStable` will never emit `true`,\n * and the trace \"App is stable now\" will never get logged.\n *\n * If you want to execute something when the app is stable,\n * you have to wait for the application to be stable\n * before starting your polling process.\n *\n * ```\n * constructor(appRef: ApplicationRef) {\n *   appRef.isStable.pipe(\n *     first(stable => stable),\n *     tap(stable => console.log('App is stable now')),\n *     switchMap(() => interval(1000))\n *   ).subscribe(counter => console.log(counter));\n * }\n * ```\n * In this example, the trace \"App is stable now\" will be logged\n * and then the counter starts incrementing every second.\n *\n * Note also that this Observable runs outside of the Angular zone,\n * which means that the code in the subscription\n * to this Observable will not trigger the change detection.\n *\n * Let's imagine that instead of logging the counter value,\n * you update a field of your component\n * and display it in its template.\n *\n * ```\n * constructor(appRef: ApplicationRef) {\n *   appRef.isStable.pipe(\n *     first(stable => stable),\n *     switchMap(() => interval(1000))\n *   ).subscribe(counter => this.value = counter);\n * }\n * ```\n * As the `isStable` Observable runs outside the zone,\n * the `value` field will be updated properly,\n * but the template will not be refreshed!\n *\n * You'll have to manually trigger the change detection to update the template.\n *\n * ```\n * constructor(appRef: ApplicationRef, cd: ChangeDetectorRef) {\n *   appRef.isStable.pipe(\n *     first(stable => stable),\n *     switchMap(() => interval(1000))\n *   ).subscribe(counter => {\n *     this.value = counter;\n *     cd.detectChanges();\n *   });\n * }\n * ```\n *\n * Or make the subscription callback run inside the zone.\n *\n * ```\n * constructor(appRef: ApplicationRef, zone: NgZone) {\n *   appRef.isStable.pipe(\n *     first(stable => stable),\n *     switchMap(() => interval(1000))\n *   ).subscribe(counter => zone.run(() => this.value = counter));\n * }\n * ```\n *\n * @publicApi\n */\n@Injectable({providedIn: 'root'})\nexport class ApplicationRef {\n  /** @internal */\n  private _bootstrapListeners: ((compRef: ComponentRef<any>) => void)[] = [];\n  private _views: InternalViewRef[] = [];\n  private _runningTick: boolean = false;\n  private _stable = true;\n  private _onMicrotaskEmptySubscription: Subscription;\n  private _destroyed = false;\n  private _destroyListeners: Array<() => void> = [];\n\n  /**\n   * Indicates whether this instance was destroyed.\n   */\n  get destroyed() {\n    return this._destroyed;\n  }\n\n  /**\n   * Get a list of component types registered to this application.\n   * This list is populated even before the component is created.\n   */\n  public readonly componentTypes: Type<any>[] = [];\n\n  /**\n   * Get a list of components registered to this application.\n   */\n  public readonly components: ComponentRef<any>[] = [];\n\n  /**\n   * Returns an Observable that indicates when the application is stable or unstable.\n   *\n   * @see  [Usage notes](#is-stable-examples) for examples and caveats when using this API.\n   */\n  // TODO(issue/24571): remove '!'.\n  public readonly isStable!: Observable<boolean>;\n\n  /**\n   * The `EnvironmentInjector` used to create this application.\n   */\n  get injector(): EnvironmentInjector {\n    return this._injector;\n  }\n\n  /** @internal */\n  constructor(\n      private _zone: NgZone,\n      private _injector: EnvironmentInjector,\n      private _exceptionHandler: ErrorHandler,\n  ) {\n    this._onMicrotaskEmptySubscription = this._zone.onMicrotaskEmpty.subscribe({\n      next: () => {\n        this._zone.run(() => {\n          this.tick();\n        });\n      }\n    });\n\n    const isCurrentlyStable = new Observable<boolean>((observer: Observer<boolean>) => {\n      this._stable = this._zone.isStable && !this._zone.hasPendingMacrotasks &&\n          !this._zone.hasPendingMicrotasks;\n      this._zone.runOutsideAngular(() => {\n        observer.next(this._stable);\n        observer.complete();\n      });\n    });\n\n    const isStable = new Observable<boolean>((observer: Observer<boolean>) => {\n      // Create the subscription to onStable outside the Angular Zone so that\n      // the callback is run outside the Angular Zone.\n      let stableSub: Subscription;\n      this._zone.runOutsideAngular(() => {\n        stableSub = this._zone.onStable.subscribe(() => {\n          NgZone.assertNotInAngularZone();\n\n          // Check whether there are no pending macro/micro tasks in the next tick\n          // to allow for NgZone to update the state.\n          scheduleMicroTask(() => {\n            if (!this._stable && !this._zone.hasPendingMacrotasks &&\n                !this._zone.hasPendingMicrotasks) {\n              this._stable = true;\n              observer.next(true);\n            }\n          });\n        });\n      });\n\n      const unstableSub: Subscription = this._zone.onUnstable.subscribe(() => {\n        NgZone.assertInAngularZone();\n        if (this._stable) {\n          this._stable = false;\n          this._zone.runOutsideAngular(() => {\n            observer.next(false);\n          });\n        }\n      });\n\n      return () => {\n        stableSub.unsubscribe();\n        unstableSub.unsubscribe();\n      };\n    });\n\n    (this as {isStable: Observable<boolean>}).isStable =\n        merge(isCurrentlyStable, isStable.pipe(share()));\n  }\n\n  /**\n   * Bootstrap a component onto the element identified by its selector or, optionally, to a\n   * specified element.\n   *\n   * @usageNotes\n   * ### Bootstrap process\n   *\n   * When bootstrapping a component, Angular mounts it onto a target DOM element\n   * and kicks off automatic change detection. The target DOM element can be\n   * provided using the `rootSelectorOrNode` argument.\n   *\n   * If the target DOM element is not provided, Angular tries to find one on a page\n   * using the `selector` of the component that is being bootstrapped\n   * (first matched element is used).\n   *\n   * ### Example\n   *\n   * Generally, we define the component to bootstrap in the `bootstrap` array of `NgModule`,\n   * but it requires us to know the component while writing the application code.\n   *\n   * Imagine a situation where we have to wait for an API call to decide about the component to\n   * bootstrap. We can use the `ngDoBootstrap` hook of the `NgModule` and call this method to\n   * dynamically bootstrap a component.\n   *\n   * {@example core/ts/platform/platform.ts region='componentSelector'}\n   *\n   * Optionally, a component can be mounted onto a DOM element that does not match the\n   * selector of the bootstrapped component.\n   *\n   * In the following example, we are providing a CSS selector to match the target element.\n   *\n   * {@example core/ts/platform/platform.ts region='cssSelector'}\n   *\n   * While in this example, we are providing reference to a DOM node.\n   *\n   * {@example core/ts/platform/platform.ts region='domNode'}\n   */\n  bootstrap<C>(component: Type<C>, rootSelectorOrNode?: string|any): ComponentRef<C>;\n\n  /**\n   * Bootstrap a component onto the element identified by its selector or, optionally, to a\n   * specified element.\n   *\n   * @usageNotes\n   * ### Bootstrap process\n   *\n   * When bootstrapping a component, Angular mounts it onto a target DOM element\n   * and kicks off automatic change detection. The target DOM element can be\n   * provided using the `rootSelectorOrNode` argument.\n   *\n   * If the target DOM element is not provided, Angular tries to find one on a page\n   * using the `selector` of the component that is being bootstrapped\n   * (first matched element is used).\n   *\n   * ### Example\n   *\n   * Generally, we define the component to bootstrap in the `bootstrap` array of `NgModule`,\n   * but it requires us to know the component while writing the application code.\n   *\n   * Imagine a situation where we have to wait for an API call to decide about the component to\n   * bootstrap. We can use the `ngDoBootstrap` hook of the `NgModule` and call this method to\n   * dynamically bootstrap a component.\n   *\n   * {@example core/ts/platform/platform.ts region='componentSelector'}\n   *\n   * Optionally, a component can be mounted onto a DOM element that does not match the\n   * selector of the bootstrapped component.\n   *\n   * In the following example, we are providing a CSS selector to match the target element.\n   *\n   * {@example core/ts/platform/platform.ts region='cssSelector'}\n   *\n   * While in this example, we are providing reference to a DOM node.\n   *\n   * {@example core/ts/platform/platform.ts region='domNode'}\n   *\n   * @deprecated Passing Component factories as the `Application.bootstrap` function argument is\n   *     deprecated. Pass Component Types instead.\n   */\n  bootstrap<C>(componentFactory: ComponentFactory<C>, rootSelectorOrNode?: string|any):\n      ComponentRef<C>;\n\n  /**\n   * Bootstrap a component onto the element identified by its selector or, optionally, to a\n   * specified element.\n   *\n   * @usageNotes\n   * ### Bootstrap process\n   *\n   * When bootstrapping a component, Angular mounts it onto a target DOM element\n   * and kicks off automatic change detection. The target DOM element can be\n   * provided using the `rootSelectorOrNode` argument.\n   *\n   * If the target DOM element is not provided, Angular tries to find one on a page\n   * using the `selector` of the component that is being bootstrapped\n   * (first matched element is used).\n   *\n   * ### Example\n   *\n   * Generally, we define the component to bootstrap in the `bootstrap` array of `NgModule`,\n   * but it requires us to know the component while writing the application code.\n   *\n   * Imagine a situation where we have to wait for an API call to decide about the component to\n   * bootstrap. We can use the `ngDoBootstrap` hook of the `NgModule` and call this method to\n   * dynamically bootstrap a component.\n   *\n   * {@example core/ts/platform/platform.ts region='componentSelector'}\n   *\n   * Optionally, a component can be mounted onto a DOM element that does not match the\n   * selector of the bootstrapped component.\n   *\n   * In the following example, we are providing a CSS selector to match the target element.\n   *\n   * {@example core/ts/platform/platform.ts region='cssSelector'}\n   *\n   * While in this example, we are providing reference to a DOM node.\n   *\n   * {@example core/ts/platform/platform.ts region='domNode'}\n   */\n  bootstrap<C>(componentOrFactory: ComponentFactory<C>|Type<C>, rootSelectorOrNode?: string|any):\n      ComponentRef<C> {\n    NG_DEV_MODE && this.warnIfDestroyed();\n    const isComponentFactory = componentOrFactory instanceof ComponentFactory;\n    const initStatus = this._injector.get(ApplicationInitStatus);\n\n    if (!initStatus.done) {\n      const standalone = !isComponentFactory && isStandalone(componentOrFactory);\n      const errorMessage =\n          'Cannot bootstrap as there are still asynchronous initializers running.' +\n          (standalone ? '' :\n                        ' Bootstrap components in the `ngDoBootstrap` method of the root module.');\n      throw new RuntimeError(\n          RuntimeErrorCode.ASYNC_INITIALIZERS_STILL_RUNNING, NG_DEV_MODE && errorMessage);\n    }\n\n    let componentFactory: ComponentFactory<C>;\n    if (isComponentFactory) {\n      componentFactory = componentOrFactory;\n    } else {\n      const resolver = this._injector.get(ComponentFactoryResolver);\n      componentFactory = resolver.resolveComponentFactory(componentOrFactory)!;\n    }\n    this.componentTypes.push(componentFactory.componentType);\n\n    // Create a factory associated with the current module if it's not bound to some other\n    const ngModule =\n        isBoundToModule(componentFactory) ? undefined : this._injector.get(NgModuleRef);\n    const selectorOrNode = rootSelectorOrNode || componentFactory.selector;\n    const compRef = componentFactory.create(Injector.NULL, [], selectorOrNode, ngModule);\n    const nativeElement = compRef.location.nativeElement;\n    const testability = compRef.injector.get(TESTABILITY, null);\n    testability?.registerApplication(nativeElement);\n\n    compRef.onDestroy(() => {\n      this.detachView(compRef.hostView);\n      remove(this.components, compRef);\n      testability?.unregisterApplication(nativeElement);\n    });\n\n    this._loadComponent(compRef);\n    if (typeof ngDevMode === 'undefined' || ngDevMode) {\n      const _console = this._injector.get(Console);\n      _console.log(\n          `Angular is running in development mode. Call enableProdMode() to enable production mode.`);\n    }\n    return compRef;\n  }\n\n  /**\n   * Invoke this method to explicitly process change detection and its side-effects.\n   *\n   * In development mode, `tick()` also performs a second change detection cycle to ensure that no\n   * further changes are detected. If additional changes are picked up during this second cycle,\n   * bindings in the app have side-effects that cannot be resolved in a single change detection\n   * pass.\n   * In this case, Angular throws an error, since an Angular application can only have one change\n   * detection pass during which all change detection must complete.\n   */\n  tick(): void {\n    NG_DEV_MODE && this.warnIfDestroyed();\n    if (this._runningTick) {\n      throw new RuntimeError(\n          RuntimeErrorCode.RECURSIVE_APPLICATION_REF_TICK,\n          ngDevMode && 'ApplicationRef.tick is called recursively');\n    }\n\n    try {\n      this._runningTick = true;\n      for (let view of this._views) {\n        view.detectChanges();\n      }\n      if (typeof ngDevMode === 'undefined' || ngDevMode) {\n        for (let view of this._views) {\n          view.checkNoChanges();\n        }\n      }\n    } catch (e) {\n      // Attention: Don't rethrow as it could cancel subscriptions to Observables!\n      this._zone.runOutsideAngular(() => this._exceptionHandler.handleError(e));\n    } finally {\n      this._runningTick = false;\n    }\n  }\n\n  /**\n   * Attaches a view so that it will be dirty checked.\n   * The view will be automatically detached when it is destroyed.\n   * This will throw if the view is already attached to a ViewContainer.\n   */\n  attachView(viewRef: ViewRef): void {\n    NG_DEV_MODE && this.warnIfDestroyed();\n    const view = (viewRef as InternalViewRef);\n    this._views.push(view);\n    view.attachToAppRef(this);\n  }\n\n  /**\n   * Detaches a view from dirty checking again.\n   */\n  detachView(viewRef: ViewRef): void {\n    NG_DEV_MODE && this.warnIfDestroyed();\n    const view = (viewRef as InternalViewRef);\n    remove(this._views, view);\n    view.detachFromAppRef();\n  }\n\n  private _loadComponent(componentRef: ComponentRef<any>): void {\n    this.attachView(componentRef.hostView);\n    this.tick();\n    this.components.push(componentRef);\n    // Get the listeners lazily to prevent DI cycles.\n    const listeners =\n        this._injector.get(APP_BOOTSTRAP_LISTENER, []).concat(this._bootstrapListeners);\n    listeners.forEach((listener) => listener(componentRef));\n  }\n\n  /** @internal */\n  ngOnDestroy() {\n    if (this._destroyed) return;\n\n    try {\n      // Call all the lifecycle hooks.\n      this._destroyListeners.forEach(listener => listener());\n\n      // Destroy all registered views.\n      this._views.slice().forEach((view) => view.destroy());\n      this._onMicrotaskEmptySubscription.unsubscribe();\n    } finally {\n      // Indicate that this instance is destroyed.\n      this._destroyed = true;\n\n      // Release all references.\n      this._views = [];\n      this._bootstrapListeners = [];\n      this._destroyListeners = [];\n    }\n  }\n\n  /**\n   * Registers a listener to be called when an instance is destroyed.\n   *\n   * @param callback A callback function to add as a listener.\n   * @returns A function which unregisters a listener.\n   *\n   * @internal\n   */\n  onDestroy(callback: () => void): VoidFunction {\n    NG_DEV_MODE && this.warnIfDestroyed();\n    this._destroyListeners.push(callback);\n    return () => remove(this._destroyListeners, callback);\n  }\n\n  /**\n   * Destroys an Angular application represented by this `ApplicationRef`. Calling this function\n   * will destroy the associated environment injectors as well as all the bootstrapped components\n   * with their views.\n   */\n  destroy(): void {\n    if (this._destroyed) {\n      throw new RuntimeError(\n          RuntimeErrorCode.APPLICATION_REF_ALREADY_DESTROYED,\n          ngDevMode && 'This instance of the `ApplicationRef` has already been destroyed.');\n    }\n\n    // This is a temporary type to represent an instance of an R3Injector, which can be destroyed.\n    // The type will be replaced with a different one once destroyable injector type is available.\n    type DestroyableInjector = Injector&{destroy?: Function, destroyed?: boolean};\n\n    const injector = this._injector as DestroyableInjector;\n\n    // Check that this injector instance supports destroy operation.\n    if (injector.destroy && !injector.destroyed) {\n      // Destroying an underlying injector will trigger the `ngOnDestroy` lifecycle\n      // hook, which invokes the remaining cleanup actions.\n      injector.destroy();\n    }\n  }\n\n  /**\n   * Returns the number of attached views.\n   */\n  get viewCount() {\n    return this._views.length;\n  }\n\n  private warnIfDestroyed() {\n    if (NG_DEV_MODE && this._destroyed) {\n      console.warn(formatRuntimeError(\n          RuntimeErrorCode.APPLICATION_REF_ALREADY_DESTROYED,\n          'This instance of the `ApplicationRef` has already been destroyed.'));\n    }\n  }\n}\n\nfunction remove<T>(list: T[], el: T): void {\n  const index = list.indexOf(el);\n  if (index > -1) {\n    list.splice(index, 1);\n  }\n}\n\nfunction _lastDefined<T>(args: T[]): T|undefined {\n  for (let i = args.length - 1; i >= 0; i--) {\n    if (args[i] !== undefined) {\n      return args[i];\n    }\n  }\n  return undefined;\n}\n\nfunction _mergeArrays(parts: any[][]): any[] {\n  const result: any[] = [];\n  parts.forEach((part) => part && result.push(...part));\n  return result;\n}\n"]}