无法在 Angular 模块中加载动态参数 forRoot import while 运行 --aot flag

Question

我试图让我的代码在 --aot 标志期间编译，但是当我尝试将环境配置加载到我在 app.module.ts 文件中导入的日志记录服务时，它失败了。我的代码看起来像这样，在 "ng serve"

下运行良好

这是我想动态传递给我的单例日志服务的结构。

// In it's own ts file, not in the module
export interface AppConfiguration {   
  user: User;
  application: ApplicationConfig;
}

// In it's own ts file, not in the module
export const appConfig = (): AppConfiguration => {
  // ... logic happens here to set up the environment, load cookies etc that will result something like this
  const userConf: User = {username: 'ronnrak', name: 'Ronny Raketgevär', id: 1, location: 'a place'};
  const appConf: ApplicationConfig = {defaultLogLevel: 'debug', defaultLogType: 'console'};
  return {user: userConf, application: appConf};
}

logging.module.ts:

export const APP_CONFIG = new InjectionToken<AppConfiguration>('app_config');

@NgModule({
  imports: [CommonModule]
})
export class LoggingModule {
  constructor(@Optional() @SkipSelf() parentModule: LoggingModule) {
    if(parentModule) {
      throw new Error('LoggingModule is already loaded, import in AppModule only.');
    }
  }

  static forRoot(config: AppConfiguration): ModuleWithProviders {
    return {
      ngModule: LoggingModule,
      providers: [
        {provide: APP_CONFIG, useValue: config},
        {provide: LoggingService, useFactory: (conf: AppConfiguration) => {
          return conf.Application.defaultLogType === 'console' ? new ConsoleLoggingService(conf) : new RestLoggingService(conf);
        }, deps:[APP_CONFIG]}
      ]
    };
  }
}

app.module.ts错误发生的地方

const applicationConfigData: AppConfiguration = appConfig(); <-- error points here

@NgModule({
  declarations: [
    ...
  ],
  imports: [
    ...
    LoggingModule.forRoot(applicationConfigData),
    ...
  ],
  providers: [
    {provide: APP_CONFIG, useValue: applicationConfigData},
    {provide: StoreService, useFactory: (conf: AppConfiguration) => new StoreService(conf), deps: [APP_CONFIG]},
    ...
  ],
  schemas: [
    ...
  ],
  bootstrap: [
    ...
  ]
})
export class AppModule {}

这是我在运行 --aot

时得到的错误

ERROR in apps\project\src\app\app.module.ts(17,49): Error during template compile of 'AppModule'
  Function expressions are not supported in decorators in 'appConfig'
    'appConfig' references 'appConfig'
      'appConfig' contains the error at libs\environment\src\lib\init\app-init.ts(19,26)
        Consider changing the function expression into an exported function.

我试过在没有 lambda 表达式的情况下更改 appConfig，只是一个明确的导出函数，但它也没有用。

ERROR in apps\project\src\app\app.module.ts(17,49): Error during template compile of 'AppModule'
  Function calls are not supported in decorators but 'appConfig' was called.

如何从 app.module 将动态数据加载到我的单例服务中？

Answer 1

您应该导出 LoggingService 和 StoreService 的 useFactory 函数，因为，我引用了 trichetriche

You simply can't use function calls in decorators

日志服务

export function loggingFactory(conf: AppConfiguration) {
  return conf.Application.defaultLogType === 'console' ? 
    new ConsoleLoggingService(conf) : new RestLoggingService(conf);
}

{
  provide: LoggingService, 
  useFactory: loggingFactory, 
  deps:[APP_CONFIG]
}

商店服务：

export function storeFactory(conf: AppConfiguration) {
  return new StoreService(conf);
}

{
  provide: StoreService, 
  useFactory: storeFactory, 
  deps: [APP_CONFIG]
},

但是这个似乎有点过时了，因为你可以直接使用该服务并使用 @Inject()

注入 APP_CONFIG

@Injectable()
export class StoreService {
  constructor(@Inject(APP_CONFIG) appConfig: AppConfiguration) {}
}

无法在 Angular 模块中加载动态参数 forRoot import while 运行 --aot flag

Can't load dynamic arguments in an Angular module forRoot import while running with --aot flag

angular-module

angular-cli

angular

angular-aot

nrwl