Angular2延迟加载模块错误'找不到模块'

Question

我试图找到这个错误的任何解决方案,但没有任何对我有用.我有使用Angular-CLI创建的简单Angular2应用程序.当我在浏览器中提供此应用程序时,我收到此错误:EXCEPTION: Uncaught (in promise): Error: Cannot find module '/app/test.module'. 我正在尝试在loadChildren中使用不同的路径:

'/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

app.module.ts

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

重启ng serve对我有用

Answer 2

我遇到过同样的问题.我通过做两件事来解决它:

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

我已将./添加为loadChildren字符串的前缀.

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

我正在使用webpack 2,它需要一个Angular 2的加载器,它可以使用Angular Router加载基于字符串的模块.将其添加到项目中

yarn add angular-router-loader -D

然后添加angular-router-loader到打字稿加载器

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

它为我工作.

Answer 3

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它,但是模块类型引用(更容易编写且不易出错):

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

我找不到Angular(loader)的最低版本支持这种语法.

可能与AOT一起使用的方法是用常规方法替换lambda语法:

export function getTestModule() { return TestModule; }

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

Answer 4

对于使用最新 Angular 版本（在我的情况下为 v9）的人，您可以使用以下语法声明设置您的路线：

import { TestModule } from './modules/test.module';
const appRoutes: Routes = [
  { path: 'blogs', loadChildren: () => import('./modules/test.module').then(m => m.TestModule) },
];

// NgModule
// declarations
// imports
// providers
// bootstrap

export class AppModule { }

另一种方式（无需在顶部进行导入）：

    const appRoutes: Routes = [
      { path: 'blogs', loadChildren: () => import('./modules/test.module').then(m => m.TestModule) },
    ];

Answer 5

最后我发现我需要以这种方式在路由配置中导入延迟加载的模块:

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

没有任何/或./在模块路径前面.