Angular2延迟加载模块错误“找不到模块”

Question

我试图找到此错误的任何解决方案，但没有任何对我有用。我有一个简单的Angular2应用程序，使用Angulal-CLI创建。当我在浏览器中提供此应用程序时，我收到此错误：EXCEPTION：未捕获（promise）：错误：找不到模块'/app/test.module'。我正在尝试在加载中使用不同的路径儿童：

'/app/test.module'
'./app/test.module'
'./test.module'
'/src/app/test.module'

文件夹

src/
  app/
    app-routing.module.ts
    app.component.ts
    app.module.ts
    test.component.ts
    test.module.ts

应用程序模块

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { HttpModule } from '@angular/http';

import { RoutingModule } from './app-routing.module';

import { AppComponent } from './app.component';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    FormsModule,
    HttpModule,
    RoutingModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

app-routing.module.ts

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';


const routes: Routes = [
  { path: '', loadChildren: '/app/test.module' }
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule],
  providers: []
})
export class RoutingModule { }

test.module.ts

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { CommonModule } from '@angular/common';
import { TestComponent } from './test.component';

export const routes: Routes = [
    { path: '', component: TestComponent }
];

@NgModule({
  imports: [
    CommonModule,
    RouterModule.forChild(routes)
  ],
  exports: [TestComponent],
  declarations: [TestComponent]
})
export default class TestModule { }

堆栈跟踪

        error_handler.js:45EXCEPTION: Uncaught (in promise): Error: Cannot find module '/app/test.module'.ErrorHandler.handleError @ error_handler.js:45next @ application_ref.js:273schedulerFn @ async.js:82SafeSubscriber.__tryOrUnsub @ Subscriber.js:223SafeSubscriber.next @ Subscriber.js:172Subscriber._next @ Subscriber.js:125Subscriber.next @ Subscriber.js:89Subject.next @ Subject.js:55EventEmitter.emit @ async.js:74onError @ ng_zone.js:120onHandleError @ ng_zone_impl.js:64ZoneDelegate.handleError @ zone.js:207Zone.runGuarded @ zone.js:113_loop_1 @ zone.js:379drainMicroTaskQueue @ zone.js:386
    2016-10-08 14:22:50.612 error_handler.js:50ORIGINAL STACKTRACE:ErrorHandler.handleError @ error_handler.js:50next @ application_ref.js:273schedulerFn @ async.js:82SafeSubscriber.__tryOrUnsub @ Subscriber.js:223SafeSubscriber.next @ Subscriber.js:172Subscriber._next @ Subscriber.js:125Subscriber.next @ Subscriber.js:89Subject.next @ Subject.js:55EventEmitter.emit @ async.js:74onError @ ng_zone.js:120onHandleError @ ng_zone_impl.js:64ZoneDelegate.handleError @ zone.js:207Zone.runGuarded @ zone.js:113_loop_1 @ zone.js:379drainMicroTaskQueue @ zone.js:386
    2016-10-08 14:22:50.613 error_handler.js:51Error: Uncaught (in promise): Error: Cannot find module '/app/test.module'.
        at resolvePromise (zone.js:429)
        at zone.js:406
        at ZoneDelegate.invoke (zone.js:203)
        at Object.onInvoke (ng_zone_impl.js:43)
        at ZoneDelegate.invoke (zone.js:202)
        at Zone.run (zone.js:96)
        at zone.js:462
        at ZoneDelegate.invokeTask (zone.js:236)
        at Object.onInvokeTask (ng_zone_impl.js:34)
        at ZoneDelegate.invokeTask (zone.js:235)ErrorHandler.handleError @ error_handler.js:51next @ application_ref.js:273schedulerFn @ async.js:82SafeSubscriber.__tryOrUnsub @ Subscriber.js:223SafeSubscriber.next @ Subscriber.js:172Subscriber._next @ Subscriber.js:125Subscriber.next @ Subscriber.js:89Subject.next @ Subject.js:55EventEmitter.emit @ async.js:74onError @ ng_zone.js:120onHandleError @ ng_zone_impl.js:64ZoneDelegate.handleError @ zone.js:207Zone.runGuarded @ zone.js:113_loop_1 @ zone.js:379drainMicroTaskQueue @ zone.js:386
    2016-10-08 14:22:50.614 zone.js:355Unhandled Promise rejection: Cannot find module '/app/test.module'. ; Zone: angular ; Task: Promise.then ; Value: Error: Cannot find module '/app/test.module'.(…) Error: Cannot find module '/app/test.module'.
        at webpackEmptyContext (http://localhost:4200/main.bundle.js:49550:8)
        at SystemJsNgModuleLoader.loadAndCompile (http://localhost:4200/main.bundle.js:57952:40)
        at SystemJsNgModuleLoader.load (http://localhost:4200/main.bundle.js:57945:60)
        at RouterConfigLoader.loadModuleFactory (http://localhost:4200/main.bundle.js:22354:128)
        at RouterConfigLoader.load (http://localhost:4200/main.bundle.js:22346:81)
        at MergeMapSubscriber.project (http://localhost:4200/main.bundle.js:61105:111)
        at MergeMapSubscriber._tryNext (http://localhost:4200/main.bundle.js:32515:27)
        at MergeMapSubscriber._next (http://localhost:4200/main.bundle.js:32505:18)
        at MergeMapSubscriber.Subscriber.next (http://localhost:4200/main.bundle.js:7085:18)
        at ScalarObservable._subscribe (http://localhost:4200/main.bundle.js:48555:24)consoleError @ zone.js:355_loop_1 @ zone.js:382drainMicroTaskQueue @ zone.js:386
    2016-10-08 14:22:50.620 zone.js:357Error: Uncaught (in promise): Error: Cannot find module '/app/test.module'.(…)consoleError @ zone.js:357_loop_1 @ zone.js:382drainMicroTaskQueue @ zone.js:386

Answer 1

我也遇到过同样的问题。我通过做以下2件事解决了它：

在根模块的路由配置中，使用 loadChildren 与延迟加载的角度模块的相对路径。该字符串用 # 分隔，其中拆分的右侧是延迟加载模块的类名。

我已将 ./ 作为前缀添加到 loadChildren 字符串中。

{ path:'user', loadChildren:'./app/user/user.module#UserModule'}

我使用的是webpack 2，它需要Angular 2的加载器，该加载器可以使用AngularRouter加载基于字符串的模块。将其添加到项目中

yarn add angular-router-loader -D

然后将角度路由器加载器添加到打字脚本加载器

loaders: [
  {
    test: /\.ts$/,
    loaders: [
    'awesome-typescript-loader',
    'angular-router-loader'
    ]
  }
]

这对我很有效。

Answer 2

对于较新的角度版本(10？)延迟加载使用以下语法完成:

{ path: "foos", loadChildren: () => import ("./foos/foo.module").then(m => m.FooModule) },

我在使用Angular 4.4.5和webpack时遇到了类似的问题，并设法在不使用字符串的情况下修复了它，但模块类型引用（更容易编写且更不容易出错）：

const routes: Routes = [
  { path: '', loadChildren: () => TestModule }
];

我找不到支持此语法的Angular (loader)的最低版本。

一种可能适用于AOT的方法是用常规语法替换lambda语法：

export function getTestModule() { return TestModule; }

const routes: Routes = [
  { path: '', loadChildren: getTestModule }
];

还要检查此问题（多亏了rey_coder）。

Answer 3

重新启动ng服务对我有用