Angular 2扩展RouterModule抛出Uncaught Error：Type RouterOutlet是2个模块声明的一部分

Question

为什么我扩展了RouterModule我得到了RouterOutlet声明的重复：

metadata_resolver.js:505Uncaught Error: Type RouterOutlet is part of the declarations of 2 modules: RouterModule and CustomRouterModule! Please consider moving RouterOutlet to a higher module that imports RouterModule and CustomRouterModule. You can also create a new NgModule that exports and includes RouterOutlet then import that NgModule in RouterModule and CustomRouterModule.
    at CompileMetadataResolver._addTypeToModule (http://localhost:4200/main.bundle.js:22259:19)
    at http://localhost:4200/main.bundle.js:22169:27
    at Array.forEach (native)
    at CompileMetadataResolver._loadNgModuleMetadata (http://localhost:4200/main.bundle.js:22160:54)
    at CompileMetadataResolver._loadNgModuleSummary (http://localhost:4200/main.bundle.js:22073:31)
    at http://localhost:4200/main.bundle.js:22147:51
    at Array.forEach (native)
    at CompileMetadataResolver._loadNgModuleMetadata (http://localhost:4200/main.bundle.js:22143:49)
    at CompileMetadataResolver._loadNgModuleSummary (http://localhost:4200/main.bundle.js:22073:31)

以下是我如何扩展RouterModule。

import {RouterModule, Routes, ExtraOptions, Router} from "@angular/router";

export class CustomRouterModule extends RouterModule{

    public static forRoot(routes: Routes, config?: ExtraOptions)
    {
        // Do something with routes here ...
        return super.forRoot(routes, config);
    }

    public static forChild(routes: Routes, router?: Router)
    {
        // Do something with routes here ....
        return super.forChild(routes);
    }

}

我是否也获得了ngModule装饰器元数据＆＃39;扩展＆＃39; ？我想要实现的是在将路由添加到路由器时进行一些路由处理。在我将它们添加到路由器之前，我无法访问路由，因为我是懒惰加载模块。