forRoot 方法中的角度调用函数 [英] Angular call function inside forRoot method

问题描述

问题是我在 forRoot 方法中调用了一个函数，如下所示:

The problem is that I'm calling a function inside forRoot method like this:

app.module.ts

import {environment} from '../environments/environment';

...

@NgModule({
  imports: [
    BrowserModule,
    MyModule.forRoot({
      config: {
        sentryURL: environment.SENTRY_URL <-- This, calls the function
      }
    }),
    HttpClientModule,
    ...
 ]})

environemnt.ts

export function loadJSON(filePath) {
  const json = loadTextFileAjaxSync(filePath, 'application/json');
  return JSON.parse(json);
}

export function loadTextFileAjaxSync(filePath, mimeType) {
  const xmlhttp = new XMLHttpRequest();
  xmlhttp.open('GET', filePath, false);
  if (mimeType != null) {
    if (xmlhttp.overrideMimeType) {
      xmlhttp.overrideMimeType(mimeType);
    }
  }
  xmlhttp.send();
  if (xmlhttp.status === 200) {
    return xmlhttp.responseText;
  } else {
    return null;
  }
}

export const environment = loadJSON('/assets/config.json');

配置如下:

{
  "production": "false",
  "SENTRY_URL": "https://[e-mail]/whatever/1"
}

当我使用 aot 进行构建时，它说:

When I do the build with aot, it says:

src/app/app.module.ts(41,20) 中的错误:'AppModule' 的模板编译过程中出错装饰器不支持函数调用，但在环境"中调用了loadJSON"环境"调用loadJSON".

ERROR in src/app/app.module.ts(41,20): Error during template compile of 'AppModule' Function calls are not supported in decorators but 'loadJSON' was called in 'environment' 'environment' calls 'loadJSON'.

有什么想法吗??

:)

更新的解决方案:

我的最终解决方案是，在应用程序中，如 Suren Srapyan 所说，使用函数 getter.在库中，forRoot 方法应如下所示:

My final solution is, in the app, use function getters as Suren Srapyan said. In the library, the forRoot method should look like this:

export const OPTIONS = new InjectionToken<string>('OPTIONS');

export interface MyModuleOptions {
  config: {
    sentryURLGetter: () => string | Promise<string>;
  }
}

export function initialize(options: any) {
  console.log('sentryURL', options.config.sentryURLGetter());
  return function () {
  };
}

@NgModule({
  imports: [
    CommonModule
  ]
})
export class MyModule {
  static forRoot(options: MyModuleOptions): ModuleWithProviders {
    return {
      ngModule: MyModule,
      providers: [
        {provide: OPTIONS, useValue: options},
        {
          provide: APP_INITIALIZER,
          useFactory: initialize,
          deps: [OPTIONS],
          multi: true
        }
      ]
    };
  }
}

:D

推荐答案

@Decorators 不支持函数调用.或者，您可以在 @NgModule 之外获取值，然后使用它的值.

Function call is not supported in the @Decorators. Alternative you can get the value outside @NgModule and than use it's value.

export function getSentryUrl() {
   return environment.SENTRY_URL;
}

@NgModule({
   imports: [
      BrowserModule,
      MyModule.forRoot({
      config: {
        getSentryURL: getSentryUrl
      }
    }),
    HttpClientModule,
    ...
 ]})

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