找不到模块@angular/core答案

【问题标题】：Cannot find module @angular/core找不到模块@angular/core
【发布时间】：2019-09-25 19:34:17
【问题描述】：

所以我正在尝试学习一些关于如何使用 Angular 并设置 Visual Studio 用于制作网站的基本配置。我正在试图弄清楚为什么我一直收到一条消息说没有 HTTP 提供程序，然后我开始在启动时收到一个错误，说明它如何找不到 @angular/core 模块。我回滚了我为解决 HTTP 提供程序消息所做的更改，但仍然收到有关 @angular/core 的错误。我敏锐地意识到所使用的 Angular 版本已经过时了，但由于我只是想感受一下，而且这不是供公众使用的，所以我并不担心。

如果有人有想法，将不胜感激。如果有人知道如何解决 HTTP Provider 的问题，那也将不胜感激。

这是我收到的完整例外情况：

Microsoft.AspNetCore.NodeServices.HostingModels.NodeInvocationException: 'Prerendering failed because of error: Error: Cannot find module "../../../node_modules/@angular/core"
    at Object.<anonymous> (C:\Users\MyName\source\Angular2Test\Angular2Test\ClientApp\dist\main-server.js:19316:7)
    at __webpack_require__ (C:\Users\MyName\source\Angular2Test\Angular2Test\ClientApp\dist\main-server.js:20:30)
    at Object.<anonymous> (C:\Users\MyName\source\Angular2Test\Angular2Test\ClientApp\dist\main-server.js:19199:87)
    at __webpack_require__ (C:\Users\MyName\source\Angular2Test\Angular2Test\ClientApp\dist\main-server.js:20:30)
    at Object.<anonymous> (C:\Users\MyName\source\Angular2Test\Angular2Test\ClientApp\dist\main-server.js:19141:92)
    at __webpack_require__ (C:\Users\MyName\source\Angular2Test\Angular2Test\ClientApp\dist\main-server.js:20:30)
    at Object.hasOwn (C:\Users\MyName\source\Angular2Test\Angular2Test\ClientApp\dist\main-server.js:17218:77)
    at __webpack_require__ (C:\Users\MyName\source\Angular2Test\Angular2Test\ClientApp\dist\main-server.js:20:30)
    at Object.<anonymous> (C:\Users\MyName\source\Angular2Test\Angular2Test\ClientApp\dist\main-server.js:19432:81)
    at __webpack_require__ (C:\Users\MyName\source\Angular2Test\Angular2Test\ClientApp\dist\main-server.js:20:30)
Current directory is: C:\Users\MyName\source\Angular2Test\Angular2Test
'

由于我不确定问题的根源是什么文件，所以我在这里列出我认为最有可能的候选人：

package.json

{
  "name": "Angular2Test",
  "private": true,
  "version": "0.0.0",
  "scripts": {
    "test": "karma start ClientApp/test/karma.conf.js"
  },
  "devDependencies": {
    "@angular/animations": "4.2.5",
    "@angular/common": "4.2.5",
    "@angular/compiler": "4.2.5",
    "@angular/compiler-cli": "4.2.5",
    "@angular/core": "4.2.5",
    "@angular/forms": "4.2.5",
    "@angular/http": "4.2.5",
    "@angular/platform-browser": "4.2.5",
    "@angular/platform-browser-dynamic": "4.2.5",
    "@angular/platform-server": "4.2.5",
    "@angular/router": "4.2.5",
    "@ngtools/webpack": "1.5.0",
    "@types/chai": "4.0.1",
    "@types/jasmine": "2.5.53",
    "@types/webpack-env": "1.13.0",
    "angular2-router-loader": "0.3.5",
    "angular2-template-loader": "0.6.2",
    "aspnet-prerendering": "^3.0.1",
    "aspnet-webpack": "^2.0.1",
    "awesome-typescript-loader": "3.2.1",
    "bootstrap": "3.3.7",
    "chai": "4.0.2",
    "css": "2.2.1",
    "css-loader": "0.28.4",
    "es6-shim": "0.35.3",
    "event-source-polyfill": "0.0.9",
    "expose-loader": "0.7.3",
    "extract-text-webpack-plugin": "2.1.2",
    "file-loader": "0.11.2",
    "html-loader": "0.4.5",
    "isomorphic-fetch": "2.2.1",
    "jasmine-core": "2.6.4",
    "jquery": "3.2.1",
    "json-loader": "0.5.4",
    "karma": "1.7.0",
    "karma-chai": "0.1.0",
    "karma-chrome-launcher": "2.2.0",
    "karma-cli": "1.0.1",
    "karma-jasmine": "1.1.0",
    "karma-webpack": "2.0.3",
    "preboot": "4.5.2",
    "raw-loader": "0.5.1",
    "reflect-metadata": "0.1.10",
    "rxjs": "5.4.2",
    "style-loader": "0.18.2",
    "to-string-loader": "1.1.5",
    "typescript": "2.4.1",
    "url-loader": "0.5.9",
    "webpack": "2.5.1",
    "webpack-hot-middleware": "2.18.2",
    "webpack-merge": "4.1.0",
    "zone.js": "0.8.12"
  },
  "dependencies": {}
}

app.component.ts

import { Component } from '@angular/core';

@Component({
    selector: 'app',
    templateUrl: './app.component.html',
    styleUrls: ['./app.component.css']
})
export class AppComponent {
}

app.server.module.ts

import { NgModule } from '@angular/core';
import { ServerModule } from '@angular/platform-server';
import { AppModuleShared } from './app.shared.module';
import { AppComponent } from './components/app/app.component';
import { HttpModule } from '@angular/http';

@NgModule({
    bootstrap: [ AppComponent ],
    imports: [
        ServerModule,
        AppModuleShared
    ]
})
export class AppModule {
}

app.shared.module.ts

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { FormsModule } from '@angular/forms';
import { HttpModule } from '@angular/http';
import { RouterModule } from '@angular/router';

import { AppComponent } from './components/app/app.component';
import { HomeComponent } from './components/home/home.component';
import { HeaderComponent } from './components/Shared/Header/header.component';
import { FooterComponent } from './components/Shared/Footer/footer.component';
import { LoginComponent } from './components/Login/login.component';

@NgModule({
    declarations: [
        AppComponent,
        HomeComponent,
        HeaderComponent,
        FooterComponent,
        LoginComponent
    ],
    imports: [
        CommonModule,
        HttpModule,
        FormsModule,
        RouterModule.forRoot([
            { path: 'login', component: LoginComponent },
            { path: '', redirectTo: 'login', pathMatch: 'full' },
            { path: 'home', component: HomeComponent },
            { path: '**', redirectTo: 'login' }
        ])
    ]
})
export class AppModuleShared {
}

以下是我为尝试解决此问题而查看的一些内容的列表：

【问题讨论】：

npm 安装在您的 ClientApp 文件夹中。
@penleychan - 刚刚尝试过，没有任何改变。 npm install 命令没有错误，但尝试启动站点备份产生了关于找不到@angular/core 的相同消息。
npm install --dev inside your project
node和npm版本是多少？
以防万一有人遇到这个问题 - Ranjit Patra 和我花了一些时间检查可能的原因，但无法解决问题。

标签： angular visual-studio-2017

【解决方案1】：

运行

npm 安装

在你的 Angular 项目中

【讨论】：

恐怕我的电脑上没有这个解决方案来测试这是否能解决问题。