Function expressions are not supported in decorators

In my case error was caused by:

export const listAnimation = ()...

instead of:

export function listAnimation()...

You need to refactor code like this:

{
  provide: APP_INITIALIZER,
  useFactory: loadStuff,
  deps: [InitRolesService],
  multi: true
}

and then export function

export function loadStuff(service: InitService) {
   return () => service.load().subscribe(data => { ... }));
}

As your error says, you need to export the function. Decorators don't accept function calls into their properties.

You can find more information on this github issue : https://github.com/angular/angular/issues/15587

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