import { inject, Injectable, InjectionToken } from './di';
import { RuntimeError } from './errors';
import { isPromise, isSubscribable } from './util/lang';
import * as i0 from "./r3_symbols";
/**
 * A [DI token](guide/glossary#di-token "DI token definition") that you can use to provide
 * one or more initialization functions.
 *
 * The provided functions are injected at application startup and executed during
 * app initialization. If any of these functions returns a Promise or an Observable, initialization
 * does not complete until the Promise is resolved or the Observable is completed.
 *
 * You can, for example, create a factory function that loads language data
 * or an external configuration, and provide that function to the `APP_INITIALIZER` token.
 * The function is executed during the application bootstrap process,
 * and the needed data is available on startup.
 *
 * @see {@link ApplicationInitStatus}
 *
 * @usageNotes
 *
 * The following example illustrates how to configure a multi-provider using `APP_INITIALIZER` token
 * and a function returning a promise.
 * ### Example with NgModule-based application
 * ```
 *  function initializeApp(): Promise<any> {
 *    return new Promise((resolve, reject) => {
 *      // Do some asynchronous stuff
 *      resolve();
 *    });
 *  }
 *
 *  @NgModule({
 *   imports: [BrowserModule],
 *   declarations: [AppComponent],
 *   bootstrap: [AppComponent],
 *   providers: [{
 *     provide: APP_INITIALIZER,
 *     useFactory: () => initializeApp,
 *     multi: true
 *    }]
 *   })
 *  export class AppModule {}
 * ```
 *
 * ### Example with standalone application
 * ```
 * export function initializeApp(http: HttpClient) {
 *   return (): Promise<any> =>
 *     firstValueFrom(
 *       http
 *         .get("https://someUrl.com/api/user")
 *         .pipe(tap(user => { ... }))
 *     );
 * }
 *
 * bootstrapApplication(App, {
 *   providers: [
 *     provideHttpClient(),
 *     {
 *       provide: APP_INITIALIZER,
 *       useFactory: initializeApp,
 *       multi: true,
 *       deps: [HttpClient],
 *     },
 *   ],
 * });

 * ```
 *
 *
 * It's also possible to configure a multi-provider using `APP_INITIALIZER` token and a function
 * returning an observable, see an example below. Note: the `HttpClient` in this example is used for
 * demo purposes to illustrate how the factory function can work with other providers available
 * through DI.
 *
 * ### Example with NgModule-based application
 * ```
 *  function initializeAppFactory(httpClient: HttpClient): () => Observable<any> {
 *   return () => httpClient.get("https://someUrl.com/api/user")
 *     .pipe(
 *        tap(user => { ... })
 *     );
 *  }
 *
 *  @NgModule({
 *    imports: [BrowserModule, HttpClientModule],
 *    declarations: [AppComponent],
 *    bootstrap: [AppComponent],
 *    providers: [{
 *      provide: APP_INITIALIZER,
 *      useFactory: initializeAppFactory,
 *      deps: [HttpClient],
 *      multi: true
 *    }]
 *  })
 *  export class AppModule {}
 * ```
 *
 * ### Example with standalone application
 * ```
 *  function initializeAppFactory(httpClient: HttpClient): () => Observable<any> {
 *   return () => httpClient.get("https://someUrl.com/api/user")
 *     .pipe(
 *        tap(user => { ... })
 *     );
 *  }
 *
 * bootstrapApplication(App, {
 *   providers: [
 *     provideHttpClient(),
 *     {
 *       provide: APP_INITIALIZER,
 *       useFactory: initializeApp,
 *       multi: true,
 *       deps: [HttpClient],
 *     },
 *   ],
 * });
 * ```
 *
 * @publicApi
 */
export const APP_INITIALIZER = new InjectionToken('Application Initializer');
/**
 * A class that reflects the state of running {@link APP_INITIALIZER} functions.
 *
 * @publicApi
 */
export class ApplicationInitStatus {
    constructor() {
        this.initialized = false;
        this.done = false;
        this.donePromise = new Promise((res, rej) => {
            this.resolve = res;
            this.reject = rej;
        });
        this.appInits = inject(APP_INITIALIZER, { optional: true }) ?? [];
        if ((typeof ngDevMode === 'undefined' || ngDevMode) && !Array.isArray(this.appInits)) {
            throw new RuntimeError(-209 /* RuntimeErrorCode.INVALID_MULTI_PROVIDER */, 'Unexpected type of the `APP_INITIALIZER` token value ' +
                `(expected an array, but got ${typeof this.appInits}). ` +
                'Please check that the `APP_INITIALIZER` token is configured as a ' +
                '`multi: true` provider.');
        }
    }
    /** @internal */
    runInitializers() {
        if (this.initialized) {
            return;
        }
        const asyncInitPromises = [];
        for (const appInits of this.appInits) {
            const initResult = appInits();
            if (isPromise(initResult)) {
                asyncInitPromises.push(initResult);
            }
            else if (isSubscribable(initResult)) {
                const observableAsPromise = new Promise((resolve, reject) => {
                    initResult.subscribe({ complete: resolve, error: reject });
                });
                asyncInitPromises.push(observableAsPromise);
            }
        }
        const complete = () => {
            // @ts-expect-error overwriting a readonly
            this.done = true;
            this.resolve();
        };
        Promise.all(asyncInitPromises)
            .then(() => {
            complete();
        })
            .catch(e => {
            this.reject(e);
        });
        if (asyncInitPromises.length === 0) {
            complete();
        }
        this.initialized = true;
    }
    static { this.ɵfac = function ApplicationInitStatus_Factory(t) { return new (t || ApplicationInitStatus)(); }; }
    static { this.ɵprov = /*@__PURE__*/ i0.ɵɵdefineInjectable({ token: ApplicationInitStatus, factory: ApplicationInitStatus.ɵfac, providedIn: 'root' }); }
}
(function () { (typeof ngDevMode === "undefined" || ngDevMode) && i0.setClassMetadata(ApplicationInitStatus, [{
        type: Injectable,
        args: [{ providedIn: 'root' }]
    }], function () { return []; }, null); })();
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If any of these functions returns a Promise or an Observable, initialization\n * does not complete until the Promise is resolved or the Observable is completed.\n *\n * You can, for example, create a factory function that loads language data\n * or an external configuration, and provide that function to the `APP_INITIALIZER` token.\n * The function is executed during the application bootstrap process,\n * and the needed data is available on startup.\n *\n * @see {@link ApplicationInitStatus}\n *\n * @usageNotes\n *\n * The following example illustrates how to configure a multi-provider using `APP_INITIALIZER` token\n * and a function returning a promise.\n * ### Example with NgModule-based application\n * ```\n *  function initializeApp(): Promise<any> {\n *    return new Promise((resolve, reject) => {\n *      // Do some asynchronous stuff\n *      resolve();\n *    });\n *  }\n *\n *  @NgModule({\n *   imports: [BrowserModule],\n *   declarations: [AppComponent],\n *   bootstrap: [AppComponent],\n *   providers: [{\n *     provide: APP_INITIALIZER,\n *     useFactory: () => initializeApp,\n *     multi: true\n *    }]\n *   })\n *  export class AppModule {}\n * ```\n *\n * ### Example with standalone application\n * ```\n * export function initializeApp(http: HttpClient) {\n *   return (): Promise<any> =>\n *     firstValueFrom(\n *       http\n *         .get(\"https://someUrl.com/api/user\")\n *         .pipe(tap(user => { ... }))\n *     );\n * }\n *\n * bootstrapApplication(App, {\n *   providers: [\n *     provideHttpClient(),\n *     {\n *       provide: APP_INITIALIZER,\n *       useFactory: initializeApp,\n *       multi: true,\n *       deps: [HttpClient],\n *     },\n *   ],\n * });\n\n * ```\n *\n *\n * It's also possible to configure a multi-provider using `APP_INITIALIZER` token and a function\n * returning an observable, see an example below. Note: the `HttpClient` in this example is used for\n * demo purposes to illustrate how the factory function can work with other providers available\n * through DI.\n *\n * ### Example with NgModule-based application\n * ```\n *  function initializeAppFactory(httpClient: HttpClient): () => Observable<any> {\n *   return () => httpClient.get(\"https://someUrl.com/api/user\")\n *     .pipe(\n *        tap(user => { ... })\n *     );\n *  }\n *\n *  @NgModule({\n *    imports: [BrowserModule, HttpClientModule],\n *    declarations: [AppComponent],\n *    bootstrap: [AppComponent],\n *    providers: [{\n *      provide: APP_INITIALIZER,\n *      useFactory: initializeAppFactory,\n *      deps: [HttpClient],\n *      multi: true\n *    }]\n *  })\n *  export class AppModule {}\n * ```\n *\n * ### Example with standalone application\n * ```\n *  function initializeAppFactory(httpClient: HttpClient): () => Observable<any> {\n *   return () => httpClient.get(\"https://someUrl.com/api/user\")\n *     .pipe(\n *        tap(user => { ... })\n *     );\n *  }\n *\n * bootstrapApplication(App, {\n *   providers: [\n *     provideHttpClient(),\n *     {\n *       provide: APP_INITIALIZER,\n *       useFactory: initializeApp,\n *       multi: true,\n *       deps: [HttpClient],\n *     },\n *   ],\n * });\n * ```\n *\n * @publicApi\n */\nexport const APP_INITIALIZER =\n    new InjectionToken<ReadonlyArray<() => Observable<unknown>| Promise<unknown>| void>>(\n        'Application Initializer');\n\n/**\n * A class that reflects the state of running {@link APP_INITIALIZER} functions.\n *\n * @publicApi\n */\n@Injectable({providedIn: 'root'})\nexport class ApplicationInitStatus {\n  // Using non null assertion, these fields are defined below\n  // within the `new Promise` callback (synchronously).\n  private resolve!: (...args: any[]) => void;\n  private reject!: (...args: any[]) => void;\n\n  private initialized = false;\n  public readonly done = false;\n  public readonly donePromise: Promise<any> = new Promise((res, rej) => {\n    this.resolve = res;\n    this.reject = rej;\n  });\n\n  private readonly appInits = inject(APP_INITIALIZER, {optional: true}) ?? [];\n\n  constructor() {\n    if ((typeof ngDevMode === 'undefined' || ngDevMode) && !Array.isArray(this.appInits)) {\n      throw new RuntimeError(\n          RuntimeErrorCode.INVALID_MULTI_PROVIDER,\n          'Unexpected type of the `APP_INITIALIZER` token value ' +\n              `(expected an array, but got ${typeof this.appInits}). ` +\n              'Please check that the `APP_INITIALIZER` token is configured as a ' +\n              '`multi: true` provider.');\n    }\n  }\n\n  /** @internal */\n  runInitializers() {\n    if (this.initialized) {\n      return;\n    }\n\n    const asyncInitPromises = [];\n    for (const appInits of this.appInits) {\n      const initResult = appInits();\n      if (isPromise(initResult)) {\n        asyncInitPromises.push(initResult);\n      } else if (isSubscribable(initResult)) {\n        const observableAsPromise = new Promise<void>((resolve, reject) => {\n          initResult.subscribe({complete: resolve, error: reject});\n        });\n        asyncInitPromises.push(observableAsPromise);\n      }\n    }\n\n    const complete = () => {\n      // @ts-expect-error overwriting a readonly\n      this.done = true;\n      this.resolve();\n    };\n\n    Promise.all(asyncInitPromises)\n        .then(() => {\n          complete();\n        })\n        .catch(e => {\n          this.reject(e);\n        });\n\n    if (asyncInitPromises.length === 0) {\n      complete();\n    }\n    this.initialized = true;\n  }\n}\n"]}