库模块中的Angular APP_INITIALIZER生成元数据编译时错误:不支持Lambda

Question

这是我的ng库模块代码

@NgModule({
imports: [NgIdleModule.forRoot()],
providers: [ {
provide: APP_INITIALIZER,
useFactory: (idleStateChangeHandlerService: IdleStateChangeHandlerService) =>  () => console.log(IdleStateChangeHandlerService),
multi: true,
deps: [IdleStateChangeHandlerService]
}]
})
export class IdleActivityModule {
static forRoot(config: IdleActivityConfig): ModuleWithProviders {
return {
ngModule: IdleActivityModule,
providers: [
{
provide: IdleActivityConfigInjectionToken,
useValue: config
}
]
};
}
}

在建：

> Compiling TypeScript sources through ngc ERROR:
> C:/_dev/seemis-workspace/projects/shared-modules/src/lib/idle-activity/idle-activity.module.ts:9:1:
> Error encountered in metadata generated for exported symbol
> 'IdleActivityModule':  
> C:/_dev/seemis-workspace/projects/shared-modules/src/lib/idle-activity/idle-activity.module.ts:13:17:
> Metadata collected contains an error that will be reported at runtime:
> Lambda not supported.   {"__symbolic":"error","message":"Lambda not
> supported","line":12,"character":16}

如果我将APP_INITIALIZER提供程序移到应用程序模块中，这是可以的，但我不希望应用程序必须具备这些知识。

Answer 1

这是用一些功夫黑魔法修复的：

添加带有@dynamic的代码注释

// @dynamic
@NgModule({ ...

请参阅Angular Compiler Options(角度编译器选项(，除了更加困惑之外，没有其他原因。