@angular/upgrade/esm2020/static/src/downgrade_module.mjs

/**
 * @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 { PlatformRef } from '@angular/core';
import { platformBrowser } from '@angular/platform-browser';
import { module_ as angularModule } from '../../src/common/src/angular1';
import { $INJECTOR, $PROVIDE, DOWNGRADED_MODULE_COUNT_KEY, INJECTOR_KEY, LAZY_MODULE_REF, UPGRADE_APP_TYPE_KEY, UPGRADE_MODULE_NAME } from '../../src/common/src/constants';
import { destroyApp, getDowngradedModuleCount, isFunction, isNgModuleType } from '../../src/common/src/util';
import { angular1Providers, setTempInjectorRef } from './angular1_providers';
import { NgAdapterInjector } from './util';
let moduleUid = 0;
/**
 * @description
 *
 * A helper function for creating an AngularJS module that can bootstrap an Angular module
 * "on-demand" (possibly lazily) when a {@link downgradeComponent downgraded component} needs to be
 * instantiated.
 *
 * *Part of the [upgrade/static](api?query=upgrade/static) library for hybrid upgrade apps that
 * support AOT compilation.*
 *
 * It allows loading/bootstrapping the Angular part of a hybrid application lazily and not having to
 * pay the cost up-front. For example, you can have an AngularJS application that uses Angular for
 * specific routes and only instantiate the Angular modules if/when the user visits one of these
 * routes.
 *
 * The Angular module will be bootstrapped once (when requested for the first time) and the same
 * reference will be used from that point onwards.
 *
 * `downgradeModule()` requires either an `NgModuleFactory`, `NgModule` class or a function:
 * - `NgModuleFactory`: If you pass an `NgModuleFactory`, it will be used to instantiate a module
 *   using `platformBrowser`'s {@link PlatformRef#bootstrapModuleFactory bootstrapModuleFactory()}.
 *   NOTE: this type of the argument is deprecated. Please either provide an `NgModule` class or a
 *   bootstrap function instead.
 * - `NgModule` class: If you pass an NgModule class, it will be used to instantiate a module
 *   using `platformBrowser`'s {@link PlatformRef#bootstrapModule bootstrapModule()}.
 * - `Function`: If you pass a function, it is expected to return a promise resolving to an
 *   `NgModuleRef`. The function is called with an array of extra {@link StaticProvider Providers}
 *   that are expected to be available from the returned `NgModuleRef`'s `Injector`.
 *
 * `downgradeModule()` returns the name of the created AngularJS wrapper module. You can use it to
 * declare a dependency in your main AngularJS module.
 *
 * {@example upgrade/static/ts/lite/module.ts region="basic-how-to"}
 *
 * For more details on how to use `downgradeModule()` see
 * [Upgrading for Performance](guide/upgrade-performance).
 *
 * @usageNotes
 *
 * Apart from `UpgradeModule`, you can use the rest of the `upgrade/static` helpers as usual to
 * build a hybrid application. Note that the Angular pieces (e.g. downgraded services) will not be
 * available until the downgraded module has been bootstrapped, i.e. by instantiating a downgraded
 * component.
 *
 * <div class="alert is-important">
 *
 *   You cannot use `downgradeModule()` and `UpgradeModule` in the same hybrid application.<br />
 *   Use one or the other.
 *
 * </div>
 *
 * ### Differences with `UpgradeModule`
 *
 * Besides their different API, there are two important internal differences between
 * `downgradeModule()` and `UpgradeModule` that affect the behavior of hybrid applications:
 *
 * 1. Unlike `UpgradeModule`, `downgradeModule()` does not bootstrap the main AngularJS module
 *    inside the {@link NgZone Angular zone}.
 * 2. Unlike `UpgradeModule`, `downgradeModule()` does not automatically run a
 *    [$digest()](https://docs.angularjs.org/api/ng/type/$rootScope.Scope#$digest) when changes are
 *    detected in the Angular part of the application.
 *
 * What this means is that applications using `UpgradeModule` will run change detection more
 * frequently in order to ensure that both frameworks are properly notified about possible changes.
 * This will inevitably result in more change detection runs than necessary.
 *
 * `downgradeModule()`, on the other side, does not try to tie the two change detection systems as
 * tightly, restricting the explicit change detection runs only to cases where it knows it is
 * necessary (e.g. when the inputs of a downgraded component change). This improves performance,
 * especially in change-detection-heavy applications, but leaves it up to the developer to manually
 * notify each framework as needed.
 *
 * For a more detailed discussion of the differences and their implications, see
 * [Upgrading for Performance](guide/upgrade-performance).
 *
 * <div class="alert is-helpful">
 *
 *   You can manually trigger a change detection run in AngularJS using
 *   [scope.$apply(...)](https://docs.angularjs.org/api/ng/type/$rootScope.Scope#$apply) or
 *   [$rootScope.$digest()](https://docs.angularjs.org/api/ng/type/$rootScope.Scope#$digest).
 *
 *   You can manually trigger a change detection run in Angular using {@link NgZone#run
 *   ngZone.run(...)}.
 *
 * </div>
 *
 * ### Downgrading multiple modules
 *
 * It is possible to downgrade multiple modules and include them in an AngularJS application. In
 * that case, each downgraded module will be bootstrapped when an associated downgraded component or
 * injectable needs to be instantiated.
 *
 * Things to keep in mind, when downgrading multiple modules:
 *
 * - Each downgraded component/injectable needs to be explicitly associated with a downgraded
 *   module. See `downgradeComponent()` and `downgradeInjectable()` for more details.
 *
 * - If you want some injectables to be shared among all downgraded modules, you can provide them as
 *   `StaticProvider`s, when creating the `PlatformRef` (e.g. via `platformBrowser` or
 *   `platformBrowserDynamic`).
 *
 * - When using {@link PlatformRef#bootstrapmodule `bootstrapModule()`} or
 *   {@link PlatformRef#bootstrapmodulefactory `bootstrapModuleFactory()`} to bootstrap the
 *   downgraded modules, each one is considered a "root" module. As a consequence, a new instance
 *   will be created for every injectable provided in `"root"` (via
 *   {@link Injectable#providedIn `providedIn`}).
 *   If this is not your intention, you can have a shared module (that will act as act as the "root"
 *   module) and create all downgraded modules using that module's injector:
 *
 *   {@example upgrade/static/ts/lite-multi-shared/module.ts region="shared-root-module"}
 *
 * @publicApi
 */
export function downgradeModule(moduleOrBootstrapFn) {
    const lazyModuleName = `${UPGRADE_MODULE_NAME}.lazy${++moduleUid}`;
    const lazyModuleRefKey = `${LAZY_MODULE_REF}${lazyModuleName}`;
    const lazyInjectorKey = `${INJECTOR_KEY}${lazyModuleName}`;
    let bootstrapFn;
    if (isNgModuleType(moduleOrBootstrapFn)) {
        // NgModule class
        bootstrapFn = (extraProviders) => platformBrowser(extraProviders).bootstrapModule(moduleOrBootstrapFn);
    }
    else if (!isFunction(moduleOrBootstrapFn)) {
        // NgModule factory
        bootstrapFn = (extraProviders) => platformBrowser(extraProviders).bootstrapModuleFactory(moduleOrBootstrapFn);
    }
    else {
        // bootstrap function
        bootstrapFn = moduleOrBootstrapFn;
    }
    let injector;
    // Create an ng1 module to bootstrap.
    angularModule(lazyModuleName, [])
        .constant(UPGRADE_APP_TYPE_KEY, 3 /* UpgradeAppType.Lite */)
        .factory(INJECTOR_KEY, [lazyInjectorKey, identity])
        .factory(lazyInjectorKey, () => {
        if (!injector) {
            throw new Error('Trying to get the Angular injector before bootstrapping the corresponding ' +
                'Angular module.');
        }
        return injector;
    })
        .factory(LAZY_MODULE_REF, [lazyModuleRefKey, identity])
        .factory(lazyModuleRefKey, [
        $INJECTOR,
        ($injector) => {
            setTempInjectorRef($injector);
            const result = {
                promise: bootstrapFn(angular1Providers).then(ref => {
                    injector = result.injector = new NgAdapterInjector(ref.injector);
                    injector.get($INJECTOR);
                    // Destroy the AngularJS app once the Angular `PlatformRef` is destroyed.
                    // This does not happen in a typical SPA scenario, but it might be useful for
                    // other use-cases where disposing of an Angular/AngularJS app is necessary
                    // (such as Hot Module Replacement (HMR)).
                    // See https://github.com/angular/angular/issues/39935.
                    injector.get(PlatformRef).onDestroy(() => destroyApp($injector));
                    return injector;
                })
            };
            return result;
        }
    ])
        .config([
        $INJECTOR, $PROVIDE,
        ($injector, $provide) => {
            $provide.constant(DOWNGRADED_MODULE_COUNT_KEY, getDowngradedModuleCount($injector) + 1);
        }
    ]);
    return lazyModuleName;
}
function identity(x) {
    return x;
}
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For example, you can have an AngularJS application that uses Angular for\n * specific routes and only instantiate the Angular modules if/when the user visits one of these\n * routes.\n *\n * The Angular module will be bootstrapped once (when requested for the first time) and the same\n * reference will be used from that point onwards.\n *\n * `downgradeModule()` requires either an `NgModuleFactory`, `NgModule` class or a function:\n * - `NgModuleFactory`: If you pass an `NgModuleFactory`, it will be used to instantiate a module\n *   using `platformBrowser`'s {@link PlatformRef#bootstrapModuleFactory bootstrapModuleFactory()}.\n *   NOTE: this type of the argument is deprecated. Please either provide an `NgModule` class or a\n *   bootstrap function instead.\n * - `NgModule` class: If you pass an NgModule class, it will be used to instantiate a module\n *   using `platformBrowser`'s {@link PlatformRef#bootstrapModule bootstrapModule()}.\n * - `Function`: If you pass a function, it is expected to return a promise resolving to an\n *   `NgModuleRef`. The function is called with an array of extra {@link StaticProvider Providers}\n *   that are expected to be available from the returned `NgModuleRef`'s `Injector`.\n *\n * `downgradeModule()` returns the name of the created AngularJS wrapper module. You can use it to\n * declare a dependency in your main AngularJS module.\n *\n * {@example upgrade/static/ts/lite/module.ts region=\"basic-how-to\"}\n *\n * For more details on how to use `downgradeModule()` see\n * [Upgrading for Performance](guide/upgrade-performance).\n *\n * @usageNotes\n *\n * Apart from `UpgradeModule`, you can use the rest of the `upgrade/static` helpers as usual to\n * build a hybrid application. Note that the Angular pieces (e.g. downgraded services) will not be\n * available until the downgraded module has been bootstrapped, i.e. by instantiating a downgraded\n * component.\n *\n * <div class=\"alert is-important\">\n *\n *   You cannot use `downgradeModule()` and `UpgradeModule` in the same hybrid application.<br />\n *   Use one or the other.\n *\n * </div>\n *\n * ### Differences with `UpgradeModule`\n *\n * Besides their different API, there are two important internal differences between\n * `downgradeModule()` and `UpgradeModule` that affect the behavior of hybrid applications:\n *\n * 1. Unlike `UpgradeModule`, `downgradeModule()` does not bootstrap the main AngularJS module\n *    inside the {@link NgZone Angular zone}.\n * 2. Unlike `UpgradeModule`, `downgradeModule()` does not automatically run a\n *    [$digest()](https://docs.angularjs.org/api/ng/type/$rootScope.Scope#$digest) when changes are\n *    detected in the Angular part of the application.\n *\n * What this means is that applications using `UpgradeModule` will run change detection more\n * frequently in order to ensure that both frameworks are properly notified about possible changes.\n * This will inevitably result in more change detection runs than necessary.\n *\n * `downgradeModule()`, on the other side, does not try to tie the two change detection systems as\n * tightly, restricting the explicit change detection runs only to cases where it knows it is\n * necessary (e.g. when the inputs of a downgraded component change). This improves performance,\n * especially in change-detection-heavy applications, but leaves it up to the developer to manually\n * notify each framework as needed.\n *\n * For a more detailed discussion of the differences and their implications, see\n * [Upgrading for Performance](guide/upgrade-performance).\n *\n * <div class=\"alert is-helpful\">\n *\n *   You can manually trigger a change detection run in AngularJS using\n *   [scope.$apply(...)](https://docs.angularjs.org/api/ng/type/$rootScope.Scope#$apply) or\n *   [$rootScope.$digest()](https://docs.angularjs.org/api/ng/type/$rootScope.Scope#$digest).\n *\n *   You can manually trigger a change detection run in Angular using {@link NgZone#run\n *   ngZone.run(...)}.\n *\n * </div>\n *\n * ### Downgrading multiple modules\n *\n * It is possible to downgrade multiple modules and include them in an AngularJS application. In\n * that case, each downgraded module will be bootstrapped when an associated downgraded component or\n * injectable needs to be instantiated.\n *\n * Things to keep in mind, when downgrading multiple modules:\n *\n * - Each downgraded component/injectable needs to be explicitly associated with a downgraded\n *   module. See `downgradeComponent()` and `downgradeInjectable()` for more details.\n *\n * - If you want some injectables to be shared among all downgraded modules, you can provide them as\n *   `StaticProvider`s, when creating the `PlatformRef` (e.g. via `platformBrowser` or\n *   `platformBrowserDynamic`).\n *\n * - When using {@link PlatformRef#bootstrapmodule `bootstrapModule()`} or\n *   {@link PlatformRef#bootstrapmodulefactory `bootstrapModuleFactory()`} to bootstrap the\n *   downgraded modules, each one is considered a \"root\" module. As a consequence, a new instance\n *   will be created for every injectable provided in `\"root\"` (via\n *   {@link Injectable#providedIn `providedIn`}).\n *   If this is not your intention, you can have a shared module (that will act as act as the \"root\"\n *   module) and create all downgraded modules using that module's injector:\n *\n *   {@example upgrade/static/ts/lite-multi-shared/module.ts region=\"shared-root-module\"}\n *\n * @publicApi\n */\nexport function downgradeModule<T>(moduleOrBootstrapFn: Type<T>|(\n    (extraProviders: StaticProvider[]) => Promise<NgModuleRef<T>>)): string;\n/**\n * @description\n *\n * A helper function for creating an AngularJS module that can bootstrap an Angular module\n * \"on-demand\" (possibly lazily) when a {@link downgradeComponent downgraded component} needs to be\n * instantiated.\n *\n * *Part of the [upgrade/static](api?query=upgrade/static) library for hybrid upgrade apps that\n * support AOT compilation.*\n *\n * It allows loading/bootstrapping the Angular part of a hybrid application lazily and not having to\n * pay the cost up-front. For example, you can have an AngularJS application that uses Angular for\n * specific routes and only instantiate the Angular modules if/when the user visits one of these\n * routes.\n *\n * The Angular module will be bootstrapped once (when requested for the first time) and the same\n * reference will be used from that point onwards.\n *\n * `downgradeModule()` requires either an `NgModuleFactory`, `NgModule` class or a function:\n * - `NgModuleFactory`: If you pass an `NgModuleFactory`, it will be used to instantiate a module\n *   using `platformBrowser`'s {@link PlatformRef#bootstrapModuleFactory bootstrapModuleFactory()}.\n *   NOTE: this type of the argument is deprecated. Please either provide an `NgModule` class or a\n *   bootstrap function instead.\n * - `NgModule` class: If you pass an NgModule class, it will be used to instantiate a module\n *   using `platformBrowser`'s {@link PlatformRef#bootstrapModule bootstrapModule()}.\n * - `Function`: If you pass a function, it is expected to return a promise resolving to an\n *   `NgModuleRef`. The function is called with an array of extra {@link StaticProvider Providers}\n *   that are expected to be available from the returned `NgModuleRef`'s `Injector`.\n *\n * `downgradeModule()` returns the name of the created AngularJS wrapper module. You can use it to\n * declare a dependency in your main AngularJS module.\n *\n * {@example upgrade/static/ts/lite/module.ts region=\"basic-how-to\"}\n *\n * For more details on how to use `downgradeModule()` see\n * [Upgrading for Performance](guide/upgrade-performance).\n *\n * @usageNotes\n *\n * Apart from `UpgradeModule`, you can use the rest of the `upgrade/static` helpers as usual to\n * build a hybrid application. Note that the Angular pieces (e.g. downgraded services) will not be\n * available until the downgraded module has been bootstrapped, i.e. by instantiating a downgraded\n * component.\n *\n * <div class=\"alert is-important\">\n *\n *   You cannot use `downgradeModule()` and `UpgradeModule` in the same hybrid application.<br />\n *   Use one or the other.\n *\n * </div>\n *\n * ### Differences with `UpgradeModule`\n *\n * Besides their different API, there are two important internal differences between\n * `downgradeModule()` and `UpgradeModule` that affect the behavior of hybrid applications:\n *\n * 1. Unlike `UpgradeModule`, `downgradeModule()` does not bootstrap the main AngularJS module\n *    inside the {@link NgZone Angular zone}.\n * 2. Unlike `UpgradeModule`, `downgradeModule()` does not automatically run a\n *    [$digest()](https://docs.angularjs.org/api/ng/type/$rootScope.Scope#$digest) when changes are\n *    detected in the Angular part of the application.\n *\n * What this means is that applications using `UpgradeModule` will run change detection more\n * frequently in order to ensure that both frameworks are properly notified about possible changes.\n * This will inevitably result in more change detection runs than necessary.\n *\n * `downgradeModule()`, on the other side, does not try to tie the two change detection systems as\n * tightly, restricting the explicit change detection runs only to cases where it knows it is\n * necessary (e.g. when the inputs of a downgraded component change). This improves performance,\n * especially in change-detection-heavy applications, but leaves it up to the developer to manually\n * notify each framework as needed.\n *\n * For a more detailed discussion of the differences and their implications, see\n * [Upgrading for Performance](guide/upgrade-performance).\n *\n * <div class=\"alert is-helpful\">\n *\n *   You can manually trigger a change detection run in AngularJS using\n *   [scope.$apply(...)](https://docs.angularjs.org/api/ng/type/$rootScope.Scope#$apply) or\n *   [$rootScope.$digest()](https://docs.angularjs.org/api/ng/type/$rootScope.Scope#$digest).\n *\n *   You can manually trigger a change detection run in Angular using {@link NgZone#run\n *   ngZone.run(...)}.\n *\n * </div>\n *\n * ### Downgrading multiple modules\n *\n * It is possible to downgrade multiple modules and include them in an AngularJS application. In\n * that case, each downgraded module will be bootstrapped when an associated downgraded component or\n * injectable needs to be instantiated.\n *\n * Things to keep in mind, when downgrading multiple modules:\n *\n * - Each downgraded component/injectable needs to be explicitly associated with a downgraded\n *   module. See `downgradeComponent()` and `downgradeInjectable()` for more details.\n *\n * - If you want some injectables to be shared among all downgraded modules, you can provide them as\n *   `StaticProvider`s, when creating the `PlatformRef` (e.g. via `platformBrowser` or\n *   `platformBrowserDynamic`).\n *\n * - When using {@link PlatformRef#bootstrapmodule `bootstrapModule()`} or\n *   {@link PlatformRef#bootstrapmodulefactory `bootstrapModuleFactory()`} to bootstrap the\n *   downgraded modules, each one is considered a \"root\" module. As a consequence, a new instance\n *   will be created for every injectable provided in `\"root\"` (via\n *   {@link Injectable#providedIn `providedIn`}).\n *   If this is not your intention, you can have a shared module (that will act as act as the \"root\"\n *   module) and create all downgraded modules using that module's injector:\n *\n *   {@example upgrade/static/ts/lite-multi-shared/module.ts region=\"shared-root-module\"}\n *\n * @publicApi\n *\n * @deprecated Passing `NgModuleFactory` as the `downgradeModule` function argument is deprecated,\n *     please pass an NgModule class reference instead.\n */\nexport function downgradeModule<T>(moduleOrBootstrapFn: NgModuleFactory<T>): string;\n/**\n * @description\n *\n * A helper function for creating an AngularJS module that can bootstrap an Angular module\n * \"on-demand\" (possibly lazily) when a {@link downgradeComponent downgraded component} needs to be\n * instantiated.\n *\n * *Part of the [upgrade/static](api?query=upgrade/static) library for hybrid upgrade apps that\n * support AOT compilation.*\n *\n * It allows loading/bootstrapping the Angular part of a hybrid application lazily and not having to\n * pay the cost up-front. For example, you can have an AngularJS application that uses Angular for\n * specific routes and only instantiate the Angular modules if/when the user visits one of these\n * routes.\n *\n * The Angular module will be bootstrapped once (when requested for the first time) and the same\n * reference will be used from that point onwards.\n *\n * `downgradeModule()` requires either an `NgModuleFactory`, `NgModule` class or a function:\n * - `NgModuleFactory`: If you pass an `NgModuleFactory`, it will be used to instantiate a module\n *   using `platformBrowser`'s {@link PlatformRef#bootstrapModuleFactory bootstrapModuleFactory()}.\n *   NOTE: this type of the argument is deprecated. Please either provide an `NgModule` class or a\n *   bootstrap function instead.\n * - `NgModule` class: If you pass an NgModule class, it will be used to instantiate a module\n *   using `platformBrowser`'s {@link PlatformRef#bootstrapModule bootstrapModule()}.\n * - `Function`: If you pass a function, it is expected to return a promise resolving to an\n *   `NgModuleRef`. The function is called with an array of extra {@link StaticProvider Providers}\n *   that are expected to be available from the returned `NgModuleRef`'s `Injector`.\n *\n * `downgradeModule()` returns the name of the created AngularJS wrapper module. You can use it to\n * declare a dependency in your main AngularJS module.\n *\n * {@example upgrade/static/ts/lite/module.ts region=\"basic-how-to\"}\n *\n * For more details on how to use `downgradeModule()` see\n * [Upgrading for Performance](guide/upgrade-performance).\n *\n * @usageNotes\n *\n * Apart from `UpgradeModule`, you can use the rest of the `upgrade/static` helpers as usual to\n * build a hybrid application. Note that the Angular pieces (e.g. downgraded services) will not be\n * available until the downgraded module has been bootstrapped, i.e. by instantiating a downgraded\n * component.\n *\n * <div class=\"alert is-important\">\n *\n *   You cannot use `downgradeModule()` and `UpgradeModule` in the same hybrid application.<br />\n *   Use one or the other.\n *\n * </div>\n *\n * ### Differences with `UpgradeModule`\n *\n * Besides their different API, there are two important internal differences between\n * `downgradeModule()` and `UpgradeModule` that affect the behavior of hybrid applications:\n *\n * 1. Unlike `UpgradeModule`, `downgradeModule()` does not bootstrap the main AngularJS module\n *    inside the {@link NgZone Angular zone}.\n * 2. Unlike `UpgradeModule`, `downgradeModule()` does not automatically run a\n *    [$digest()](https://docs.angularjs.org/api/ng/type/$rootScope.Scope#$digest) when changes are\n *    detected in the Angular part of the application.\n *\n * What this means is that applications using `UpgradeModule` will run change detection more\n * frequently in order to ensure that both frameworks are properly notified about possible changes.\n * This will inevitably result in more change detection runs than necessary.\n *\n * `downgradeModule()`, on the other side, does not try to tie the two change detection systems as\n * tightly, restricting the explicit change detection runs only to cases where it knows it is\n * necessary (e.g. when the inputs of a downgraded component change). This improves performance,\n * especially in change-detection-heavy applications, but leaves it up to the developer to manually\n * notify each framework as needed.\n *\n * For a more detailed discussion of the differences and their implications, see\n * [Upgrading for Performance](guide/upgrade-performance).\n *\n * <div class=\"alert is-helpful\">\n *\n *   You can manually trigger a change detection run in AngularJS using\n *   [scope.$apply(...)](https://docs.angularjs.org/api/ng/type/$rootScope.Scope#$apply) or\n *   [$rootScope.$digest()](https://docs.angularjs.org/api/ng/type/$rootScope.Scope#$digest).\n *\n *   You can manually trigger a change detection run in Angular using {@link NgZone#run\n *   ngZone.run(...)}.\n *\n * </div>\n *\n * ### Downgrading multiple modules\n *\n * It is possible to downgrade multiple modules and include them in an AngularJS application. In\n * that case, each downgraded module will be bootstrapped when an associated downgraded component or\n * injectable needs to be instantiated.\n *\n * Things to keep in mind, when downgrading multiple modules:\n *\n * - Each downgraded component/injectable needs to be explicitly associated with a downgraded\n *   module. See `downgradeComponent()` and `downgradeInjectable()` for more details.\n *\n * - If you want some injectables to be shared among all downgraded modules, you can provide them as\n *   `StaticProvider`s, when creating the `PlatformRef` (e.g. via `platformBrowser` or\n *   `platformBrowserDynamic`).\n *\n * - When using {@link PlatformRef#bootstrapmodule `bootstrapModule()`} or\n *   {@link PlatformRef#bootstrapmodulefactory `bootstrapModuleFactory()`} to bootstrap the\n *   downgraded modules, each one is considered a \"root\" module. As a consequence, a new instance\n *   will be created for every injectable provided in `\"root\"` (via\n *   {@link Injectable#providedIn `providedIn`}).\n *   If this is not your intention, you can have a shared module (that will act as act as the \"root\"\n *   module) and create all downgraded modules using that module's injector:\n *\n *   {@example upgrade/static/ts/lite-multi-shared/module.ts region=\"shared-root-module\"}\n *\n * @publicApi\n */\nexport function downgradeModule<T>(moduleOrBootstrapFn: Type<T>|NgModuleFactory<T>|(\n    (extraProviders: StaticProvider[]) => Promise<NgModuleRef<T>>)): string {\n  const lazyModuleName = `${UPGRADE_MODULE_NAME}.lazy${++moduleUid}`;\n  const lazyModuleRefKey = `${LAZY_MODULE_REF}${lazyModuleName}`;\n  const lazyInjectorKey = `${INJECTOR_KEY}${lazyModuleName}`;\n\n  let bootstrapFn: (extraProviders: StaticProvider[]) => Promise<NgModuleRef<T>>;\n  if (isNgModuleType(moduleOrBootstrapFn)) {\n    // NgModule class\n    bootstrapFn = (extraProviders: StaticProvider[]) =>\n        platformBrowser(extraProviders).bootstrapModule(moduleOrBootstrapFn);\n  } else if (!isFunction(moduleOrBootstrapFn)) {\n    // NgModule factory\n    bootstrapFn = (extraProviders: StaticProvider[]) =>\n        platformBrowser(extraProviders).bootstrapModuleFactory(moduleOrBootstrapFn);\n  } else {\n    // bootstrap function\n    bootstrapFn = moduleOrBootstrapFn;\n  }\n\n  let injector: Injector;\n\n  // Create an ng1 module to bootstrap.\n  angularModule(lazyModuleName, [])\n      .constant(UPGRADE_APP_TYPE_KEY, UpgradeAppType.Lite)\n      .factory(INJECTOR_KEY, [lazyInjectorKey, identity])\n      .factory(\n          lazyInjectorKey,\n          () => {\n            if (!injector) {\n              throw new Error(\n                  'Trying to get the Angular injector before bootstrapping the corresponding ' +\n                  'Angular module.');\n            }\n            return injector;\n          })\n      .factory(LAZY_MODULE_REF, [lazyModuleRefKey, identity])\n      .factory(\n          lazyModuleRefKey,\n          [\n            $INJECTOR,\n            ($injector: IInjectorService) => {\n              setTempInjectorRef($injector);\n              const result: LazyModuleRef = {\n                promise: bootstrapFn(angular1Providers).then(ref => {\n                  injector = result.injector = new NgAdapterInjector(ref.injector);\n                  injector.get($INJECTOR);\n\n                  // Destroy the AngularJS app once the Angular `PlatformRef` is destroyed.\n                  // This does not happen in a typical SPA scenario, but it might be useful for\n                  // other use-cases where disposing of an Angular/AngularJS app is necessary\n                  // (such as Hot Module Replacement (HMR)).\n                  // See https://github.com/angular/angular/issues/39935.\n                  injector.get(PlatformRef).onDestroy(() => destroyApp($injector));\n\n                  return injector;\n                })\n              };\n              return result;\n            }\n          ])\n      .config([\n        $INJECTOR, $PROVIDE,\n        ($injector: IInjectorService, $provide: IProvideService) => {\n          $provide.constant(DOWNGRADED_MODULE_COUNT_KEY, getDowngradedModuleCount($injector) + 1);\n        }\n      ]);\n\n  return lazyModuleName;\n}\n\nfunction identity<T = any>(x: T): T {\n  return x;\n}\n"]}