Angular 5延迟加载错误：找不到模块

问题描述 投票：4回答：5

我想使用延迟加载，但我不明白为什么它不起作用，它给我错误“找不到模块”。 这是我的环境： - Angular 5.2.1 - .NET Core 2 - Webpack 3.10.0 - angular-router-loader 0.8.2 - @ angular / cli 1.6.5 我在loadChildren尝试了不同的路径总是没有成功，我也暂时禁用了所有的守卫和子路由。我做错了什么？

FOLDERS

ClientApp
  app
    components
      users
        users-routing.module.ts
        users.module.ts
  app-routing.module.ts
  app.module.shared.ts

APP-routing.module.ts

const appRoutes: Routes = [
    {
        path: 'users',
        loadChildren: './components/users/users.module#UsersModule'/* ,
        canLoad: [AuthGuard] */
    },
    {
        path: '',
        redirectTo: '/login',
        pathMatch: 'full'
    },
    {
        path: '**',
        redirectTo: '/login'
    }
];

@NgModule({
    imports: [
        RouterModule.forRoot(
            appRoutes,
            { enableTracing: false }
        )
    ],
    exports: [
        RouterModule
    ],
    providers: [
        CanDeactivateGuard
    ]
})
export class AppRoutingModule { }

用户-routing.module.ts

const usersRoutes: Routes = [
    {
        path: '',
        component: UsersComponent/* ,
        //canActivate: [AuthGuard],
        children: [
            {
                path: 'detail',
                canActivateChild: [AuthGuard],
                children: [
                    {
                        path: ':id',
                        component: UserViewComponent
                    },
                    {
                        path: 'edit/:id',
                        component: UserFormComponent,
                        canDeactivate: [CanDeactivateGuard],
                        resolve: {
                            user: UsersResolver
                          }
                    },
                    {
                        path: '',
                        component: UserFormComponent,
                        canDeactivate: [CanDeactivateGuard]
                    }
                ]
            },
            {
                path: '',
                component: UsersListComponent
            }
        ] */
    }
];

@NgModule({
    imports: [
        RouterModule.forChild(
            usersRoutes
        )
    ],
    exports: [
        RouterModule
    ]
})
export class UsersRoutingModule { }

users.module.ts

@NgModule({
    imports: [
        CommonModule,
        FormsModule,
        UsersRoutingModule,
        RouterModule
    ],
    declarations: [
        UsersComponent,
        UserFormComponent,
        UsersListComponent,
        UserViewComponent
    ],
    providers: [
        UsersResolver,
        RouterModule
    ]
})
export class UsersModule { }

webpack.config.js

const path = require('path');
const webpack = require('webpack');
const merge = require('webpack-merge');
const AngularCompilerPlugin = require('@ngtools/webpack').AngularCompilerPlugin;
const CheckerPlugin = require('awesome-typescript-loader').CheckerPlugin;

module.exports = (env) => {
    // Configuration in common to both client-side and server-side bundles
    const isDevBuild = !(env && env.prod);
    const sharedConfig = {
        stats: {
            modules: false
        },
        context: __dirname,
        resolve: {
            extensions: ['.js', '.ts']
        },
        output: {
            filename: '[name].js',
            publicPath: 'dist/' // Webpack dev middleware, if enabled, handles requests for this URL prefix
        },
        module: {
            rules: [{
                    test: /\.ts$/,
                    include: /ClientApp/,
                    use: isDevBuild ? ['awesome-typescript-loader?silent=true', 'angular2-template-loader'] : '@ngtools/webpack'
                },
                {
                    test: /\.html$/,
                    use: 'html-loader?minimize=false'
                },
                {
                    test: /\.css$/,
                    use: ['to-string-loader', isDevBuild ? 'css-loader' : 'css-loader?minimize']
                },
                {
                    test: /\.(png|jpg|jpeg|gif|svg)$/,
                    use: 'url-loader?limit=25000'
                }
            ],
            loaders: [
                {
                  test: /\.ts$/,
                  loaders: [
                    'awesome-typescript-loader'
                  ]
                },
                {
                  test: /\.(ts|js)$/,
                  loaders: [
                    'angular-router-loader'
                  ]
                }
              ]
        },
        plugins: [new CheckerPlugin()]
    };

    // Configuration for client-side bundle suitable for running in browsers
    const clientBundleOutputDir = './wwwroot/dist';
    const clientBundleConfig = merge(sharedConfig, {
        entry: {
            'main-client': './ClientApp/boot.browser.ts'
        },
        output: {
            path: path.join(__dirname, clientBundleOutputDir)
        },
        plugins: [
            new webpack.DllReferencePlugin({
                context: __dirname,
                manifest: require('./wwwroot/dist/vendor-manifest.json')
            })
        ].concat(isDevBuild ? [
            // Plugins that apply in development builds only
            new webpack.SourceMapDevToolPlugin({
                filename: '[file].map', // Remove this line if you prefer inline source maps
                moduleFilenameTemplate: path.relative(clientBundleOutputDir, '[resourcePath]') // Point sourcemap entries to the original file locations on disk
            })
        ] : [
            // Plugins that apply in production builds only
            new webpack.optimize.UglifyJsPlugin(),
            new AngularCompilerPlugin({
                tsConfigPath: './tsconfig.json',
                entryModule: path.join(__dirname, 'ClientApp/app/app.module.browser#AppModule'),
                exclude: ['./**/*.server.ts']
            })
        ])
    });

    // Configuration for server-side (prerendering) bundle suitable for running in Node
    const serverBundleConfig = merge(sharedConfig, {
        resolve: {
            mainFields: ['main']
        },
        entry: {
            'main-server': './ClientApp/boot.server.ts'
        },
        plugins: [
            new webpack.DllReferencePlugin({
                context: __dirname,
                manifest: require('./ClientApp/dist/vendor-manifest.json'),
                sourceType: 'commonjs2',
                name: './vendor'
            })
        ].concat(isDevBuild ? [] : [
            // Plugins that apply in production builds only
            new AngularCompilerPlugin({
                tsConfigPath: './tsconfig.json',
                entryModule: path.join(__dirname, 'ClientApp/app/app.module.server#AppModule'),
                exclude: ['./**/*.browser.ts']
            })
        ]),
        output: {
            libraryTarget: 'commonjs',
            path: path.join(__dirname, './ClientApp/dist')
        },
        target: 'node',
        devtool: 'inline-source-map'
    });

    return [clientBundleConfig, serverBundleConfig];
};

tsconfig.json

{
  "compilerOptions": {
    "module": "es2015",
    "moduleResolution": "node",
    "target": "es5",
    "sourceMap": true,
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "skipDefaultLibCheck": true,
    "skipLibCheck": true, // Workaround for https://github.com/angular/angular/issues/17863. Remove this if you upgrade to a fixed version of Angular.
    "strict": true,
    "lib": [ "es6", "dom" ],
    "types": [ "webpack-env" ], 
    "typeRoots": [
      "node_modules/@types"
    ]
  },
  "exclude": [ "bin", "node_modules" ],
  "atom": { "rewriteTsconfig": false }
}

错误信息

未处理的Promise拒绝：找不到模块'./ClientApp/app/components/users/users.module'。 ;区域：角;任务：Promise.then;值：错误：找不到模块'./ClientApp/app/components/users/users.module'。在vendor.js V = AdjSBPSITyauSY4VQBBoZmJ6NdWqor7MEuHgdi2Dgko：34015在ZoneDelegate.invoke（vendor.js V = AdjSBPSITyauSY4VQBBoZmJ6NdWqor7MEuHgdi2Dgko：117428）在Object.onInvoke（vendor.js V = AdjSBPSITyauSY4VQBBoZmJ6NdWqor7MEuHgdi2Dgko：5604）？在ZoneDelegate.invoke（vendor.js v = AdjSBPSITyauSY4VQBBoZmJ6NdWqor7MEuHgdi2Dgko：117427）在Zone.run（vendor.js v = AdjSBPSITyauSY4VQBBoZmJ6NdWqor7MEuHgdi2Dgko：117178）在vendor.js v = AdjSBPSITyauSY4VQBBoZmJ6NdWqor7MEuHgdi2Dgko：？117898在ZoneDelegate.invokeTask（vendor.js v = AdjSBPSITyauSY4VQBBoZmJ6NdWqor7MEuHgdi2Dgko：117461）在Object.onInvokeTask（在ZoneDelegate.invokeTask 5595）（vendor.js v = AdjSBPSITyauSY4VQBBoZmJ6NdWqor7MEuHgdi2Dgko：？vendor.js v = AdjSBPSITyauSY4VQBBoZmJ6NdWqor7MEuHgdi2Dgko？117460）在Zone.runTask（vendor.js v = AdjSBPSITyauSY4VQBBoZmJ6NdWqor7MEuHgdi2Dgko：117228）错误：无法找到模块” ./ClientApp/应用/组件/用户/ users.module”。在http://localhost:5000/dist/vendor.js?v=AdjSBPSITyauSY4VQBBoZmJ6NdWqor7MEuHgdi2Dgko:34015:9 ... [截断]

编辑

link to stackblitz for testing

angular webpack lazy-loading angular-router-loader
5个回答
15
投票

我找到了两个解决方案（通过编辑VIA OP）：

1）在使用import语句解析之后对模块的引用：

import { UsersModule } from './components/users/users.module';

然后引用这种方式：

{
        path: 'users',
        loadChildren: () => UsersModule,
        canLoad: [AuthGuard]
}

2）我已经在应用程序中添加了ng-router-loader（npm install ng-router-loader --save-dev），我以这种方式设置了webpack：

        rules: [{
                test: /\.ts$/,
                include: /ClientApp/,
                //use: isDevBuild ? ['awesome-typescript-loader?silent=true', 'angular2-template-loader'] : '@ngtools/webpack'
                use: isDevBuild ? [{ loader: 'ng-router-loader' }, 'awesome-typescript-loader?silent=true', 'angular2-template-loader'] : '@ngtools/webpack'
            },
            {
                test: /\.html$/,
                use: 'html-loader?minimize=false'
            },
            {
                test: /\.css$/,
                use: ['to-string-loader', isDevBuild ? 'css-loader' : 'css-loader?minimize']
            },
            {
                test: /\.(png|jpg|jpeg|gif|svg)$/,
                use: 'url-loader?limit=25000'
            }
        ],

然后按路径引用模块：

    {
        path: 'users',
        loadChildren: './components/users/users.module#UsersModule',
        canLoad: [AuthGuard]
    }
1
投票

目前接受的答案是建议将loadChildren的值从字符串交换为函数，这样就无法在进行生产构建时进行AOT编译。

对我有用的是：1）使用绝对路径2）在项目>'projectname'>架构师>构建>选项> lazyModules下的angular.json中添加延迟加载的模块作为字符串数组。路径应与loadChildren中定义的路径相同。

因此，在您的情况下，我认为这应该在您的路由模块中工作：

loadChildren: 'app/components/users/users.module#UsersModule'

在angular.json中，在上面指定的位置添加：

lazyModules: ["app/components/users/users.module"]
0
投票

它的拼写文件夹名称是Users而不是users：

更改

'./components/users/users.module#UsersModule'

至

'./components/Users/users.module#UsersModule'
0
投票

尝试在你的user.module.ts中做：

import {UserRoutes } from './User.routing'

@NgModule({
    imports: [
        CommonModule,
        FormsModule,
        UsersRoutingModule.forChild(UserRoutes), //<-- for child
        RouterModule
    ],
    declarations: [
        UsersComponent,
        UserFormComponent,
        UsersListComponent,
        UserViewComponent
    ],
    providers: [
        UsersResolver,
        RouterModule
    ]
})
export class UsersModule { }
0
投票

通常，路径是错误的。改变路径。

例如，这个解决方案对我有用::

loadChildren: '../changelog/changelog.module#ChangelogModule'

./folder或../folder或folder

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