Angular:收集的元数据包含将在运行时报告的错误:不支持 Lambda

Question

在我的 Angular 应用程序中，我尝试使用 factory provider在我的模块中:

export function getMyFactory(): () => Window {
  return () => window;
}

@NgModule({
  providers: [
    { provide: WindowRef, useFactory: getMyFactory() },
  ],
})
export class MyModule {}

但这失败了:

Error encountered in metadata generated for exported symbol 'MyModule':

Metadata collected contains an error that will be reported at runtime: Lambda not supported

Answer 1

我在 GitHub 的一个线程上发现了一个简单的解决方案:Arrow lambda not supported in static function发表者haochi

解决方案基本上是:

assigning the result to a variable, then return the variable

因此，就我而言，我通过替换解决了:

export function getMyFactory(): () => Window {
  return () => window;
}

和:

export function getMyFactory(): () => Window {
  const res = () => window;
  return res;
}