1 | import { Inject, Injectable, InjectionToken, Optional } from './di';
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2 | import { isObservable, isPromise } from './util/lang';
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3 | import { noop } from './util/noop';
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4 | import * as i0 from "./r3_symbols";
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5 | /**
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6 | * A [DI token](guide/glossary#di-token "DI token definition") that you can use to provide
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7 | * one or more initialization functions.
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8 | *
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9 | * The provided functions are injected at application startup and executed during
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10 | * app initialization. If any of these functions returns a Promise or an Observable, initialization
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11 | * does not complete until the Promise is resolved or the Observable is completed.
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12 | *
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13 | * You can, for example, create a factory function that loads language data
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14 | * or an external configuration, and provide that function to the `APP_INITIALIZER` token.
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15 | * The function is executed during the application bootstrap process,
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16 | * and the needed data is available on startup.
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17 | *
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18 | * @see `ApplicationInitStatus`
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19 | *
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20 | * @usageNotes
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21 | *
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22 | * The following example illustrates how to configure a multi-provider using `APP_INITIALIZER` token
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23 | * and a function returning a promise.
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24 | *
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25 | * ```
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26 | * function initializeApp(): Promise<any> {
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27 | * return new Promise((resolve, reject) => {
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28 | * // Do some asynchronous stuff
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29 | * resolve();
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30 | * });
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31 | * }
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32 | *
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33 | * @NgModule({
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34 | * imports: [BrowserModule],
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35 | * declarations: [AppComponent],
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36 | * bootstrap: [AppComponent],
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37 | * providers: [{
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38 | * provide: APP_INITIALIZER,
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39 | * useFactory: () => initializeApp,
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40 | * multi: true
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41 | * }]
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42 | * })
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43 | * export class AppModule {}
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44 | * ```
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45 | *
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46 | * It's also possible to configure a multi-provider using `APP_INITIALIZER` token and a function
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47 | * returning an observable, see an example below. Note: the `HttpClient` in this example is used for
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48 | * demo purposes to illustrate how the factory function can work with other providers available
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49 | * through DI.
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50 | *
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51 | * ```
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52 | * function initializeAppFactory(httpClient: HttpClient): () => Observable<any> {
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53 | * return () => httpClient.get("https://someUrl.com/api/user")
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54 | * .pipe(
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55 | * tap(user => { ... })
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56 | * );
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57 | * }
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58 | *
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59 | * @NgModule({
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60 | * imports: [BrowserModule, HttpClientModule],
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61 | * declarations: [AppComponent],
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62 | * bootstrap: [AppComponent],
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63 | * providers: [{
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64 | * provide: APP_INITIALIZER,
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65 | * useFactory: initializeAppFactory,
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66 | * deps: [HttpClient],
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67 | * multi: true
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68 | * }]
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69 | * })
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70 | * export class AppModule {}
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71 | * ```
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72 | *
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73 | * @publicApi
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74 | */
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75 | export const APP_INITIALIZER = new InjectionToken('Application Initializer');
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76 | /**
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77 | * A class that reflects the state of running {@link APP_INITIALIZER} functions.
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78 | *
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79 | * @publicApi
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80 | */
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81 | export class ApplicationInitStatus {
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82 | constructor(appInits) {
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83 | this.appInits = appInits;
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84 | this.resolve = noop;
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85 | this.reject = noop;
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86 | this.initialized = false;
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87 | this.done = false;
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88 | this.donePromise = new Promise((res, rej) => {
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89 | this.resolve = res;
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90 | this.reject = rej;
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91 | });
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92 | }
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93 | /** @internal */
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94 | runInitializers() {
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95 | if (this.initialized) {
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96 | return;
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97 | }
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98 | const asyncInitPromises = [];
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99 | const complete = () => {
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100 | this.done = true;
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101 | this.resolve();
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102 | };
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103 | if (this.appInits) {
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104 | for (let i = 0; i < this.appInits.length; i++) {
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105 | const initResult = this.appInits[i]();
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106 | if (isPromise(initResult)) {
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107 | asyncInitPromises.push(initResult);
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108 | }
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109 | else if (isObservable(initResult)) {
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110 | const observableAsPromise = new Promise((resolve, reject) => {
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111 | initResult.subscribe({ complete: resolve, error: reject });
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112 | });
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113 | asyncInitPromises.push(observableAsPromise);
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114 | }
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115 | }
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116 | }
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117 | Promise.all(asyncInitPromises)
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118 | .then(() => {
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119 | complete();
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120 | })
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121 | .catch(e => {
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122 | this.reject(e);
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123 | });
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124 | if (asyncInitPromises.length === 0) {
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125 | complete();
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126 | }
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127 | this.initialized = true;
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128 | }
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129 | }
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130 | ApplicationInitStatus.ɵfac = function ApplicationInitStatus_Factory(t) { return new (t || ApplicationInitStatus)(i0.ɵɵinject(APP_INITIALIZER, 8)); };
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131 | ApplicationInitStatus.ɵprov = /*@__PURE__*/ i0.ɵɵdefineInjectable({ token: ApplicationInitStatus, factory: ApplicationInitStatus.ɵfac });
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132 | (function () { (typeof ngDevMode === "undefined" || ngDevMode) && i0.setClassMetadata(ApplicationInitStatus, [{
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133 | type: Injectable
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134 | }], function () { return [{ type: undefined, decorators: [{
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135 | type: Inject,
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136 | args: [APP_INITIALIZER]
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137 | }, {
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138 | type: Optional
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139 | }] }]; }, 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 `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 *\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 * 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 * ```\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 * @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()\nexport class ApplicationInitStatus {\n  private resolve = noop;\n  private reject = noop;\n  private initialized = false;\n  public readonly donePromise: Promise<any>;\n  public readonly done = false;\n\n  constructor(@Inject(APP_INITIALIZER) @Optional() private readonly appInits:\n                  ReadonlyArray<() => Observable<unknown>| Promise<unknown>| void>) {\n    this.donePromise = new Promise((res, rej) => {\n      this.resolve = res;\n      this.reject = rej;\n    });\n  }\n\n  /** @internal */\n  runInitializers() {\n    if (this.initialized) {\n      return;\n    }\n\n    const asyncInitPromises: Promise<any>[] = [];\n\n    const complete = () => {\n      (this as {done: boolean}).done = true;\n      this.resolve();\n    };\n\n    if (this.appInits) {\n      for (let i = 0; i < this.appInits.length; i++) {\n        const initResult = this.appInits[i]();\n        if (isPromise(initResult)) {\n          asyncInitPromises.push(initResult);\n        } else if (isObservable(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\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"]} |
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