title: Cannot find module "popper.js" Angular 5 Visual Studio 2017 asp.net core
body: <p>I updated my Angular's verision from 4 to 5. Below is the screenshot, I followed the instruction as per the link <a href="http://www.talkingdotnet.com/upgrade-angular-4-app-angular-5-visual-studio-2017/" rel="nofollow noreferrer">http://www.talkingdotnet.com/upgrade-angular-4-app-angular-5-visual-studio-2017/</a></p>
  
  <p><a href="https://i.stack.imgur.com/VJ8tQ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/VJ8tQ.png" alt="screen shot"></a></p>
  
  <p><code>package.json</code> file</p>
  
  <pre><code>{
    "name": "VotingWebsite",
    "private": true,
    "version": "0.0.0",
    "scripts": {
      "test": "karma start ClientApp/test/karma.conf.js"
    },
    "devDependencies": {
      "@angular/animations": "5.2.1",
      "@angular/common": "5.2.1",
      "@angular/compiler": "5.2.1",
      "@angular/compiler-cli": "5.2.1",
      "@angular/core": "5.2.1",
      "@angular/forms": "5.2.1",
      "@angular/http": "5.2.1",
      "@angular/platform-browser": "5.2.1",
      "@angular/platform-browser-dynamic": "5.2.1",
      "@angular/platform-server": "5.2.1",
      "@angular/router": "5.2.1",
      "@ngtools/webpack": "1.9.5",
      "@types/chai": "4.1.1",
      "@types/jasmine": "2.8.5",
      "@types/webpack-env": "1.13.3",
      "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": "3.4.1",
      "popper.js": "^1.12.5",
      "bootstrap": "4.0.0",
      "chai": "4.1.2",
      "css": "2.2.1",
      "css-loader": "0.28.9",
      "es6-shim": "0.35.3",
      "event-source-polyfill": "0.0.12",
      "expose-loader": "0.7.4",
      "extract-text-webpack-plugin": "3.0.2",
      "file-loader": "1.1.6",
      "html-loader": "0.5.5",
      "isomorphic-fetch": "2.2.1",
      "jasmine-core": "2.9.1",
      "jquery": "3.3.1",
      "json-loader": "0.5.7",
      "karma": "2.0.0",
      "karma-chai": "0.1.0",
      "karma-chrome-launcher": "2.2.0",
      "karma-cli": "1.0.1",
      "karma-jasmine": "1.1.1",
      "karma-webpack": "2.0.9",
      "preboot": "6.0.0-beta.1",
      "raw-loader": "0.5.1",
      "reflect-metadata": "0.1.12",
      "rxjs": "5.5.6",
      "style-loader": "0.19.1",
      "to-string-loader": "1.1.5",
      "typescript": "2.6.2",
      "url-loader": "0.6.2",
      "webpack": "3.10.0",
      "webpack-hot-middleware": "2.21.0",
      "webpack-merge": "4.1.1",
      "zone.js": "0.8.20"
    }
  }
  </code></pre>
  
  <p>I am getting an error as </p>
  
  <pre><code>Uncaught Error: Cannot find module "popper.js"
      at webpackMissingModule (vendor.js?v=g866IhqI_4JvgibiHgn9GiAXKfG42-s7C9LGGfxA0Tk:sourcemap:82252)
      at vendor.js?v=g866IhqI_4JvgibiHgn9GiAXKfG42-s7C9LGGfxA0Tk:sourcemap:82252
      at Object.&lt;anonymous&gt; (vendor.js?v=g866IhqI_4JvgibiHgn9GiAXKfG42-s7C9LGGfxA0Tk:sourcemap:82255)
      at __webpack_require__ (vendor.js?v=g866IhqI_4JvgibiHgn9GiAXKfG42-s7C9LGGfxA0Tk:sourcemap:21)
      at Object.&lt;anonymous&gt; (bootstrap.js from dll-reference vendor_19596f3f8868cecda14a:1)
      at __webpack_require__ (bootstrap acba0f7e8b1985fd75ba:678)
      at fn (bootstrap acba0f7e8b1985fd75ba:88)
      at Object.&lt;anonymous&gt; (process-update.js:146)
      at __webpack_require__ (bootstrap acba0f7e8b1985fd75ba:678)
      at fn (bootstrap acba0f7e8b1985fd75ba:88)
  </code></pre>
  
  <p>Webpack.config.js</p>
  
  <pre><code>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) =&gt; {
      // Configuration in common to both client-side and server-side bundles
      const isDevBuild = !(env &amp;&amp; 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$/, use: isDevBuild ? ['awesome-typescript-loader?silent=true', 'angular2-template-loader', 'angular2-router-loader'] : '@ngtools/webpack' },
                  { test: /\.html$/, 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' }
              ]
          },
          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.browser.module#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.server.module#AppModule'),
                  exclude: ['./**/*.browser.ts']
              })
          ]),
          output: {
              libraryTarget: 'commonjs',
              path: path.join(__dirname, './ClientApp/dist')
          },
          target: 'node',
          devtool: 'inline-source-map'
      });
  
      return [clientBundleConfig, serverBundleConfig];
  };
  </code></pre>
  
  <p>It was working perfectly with angular 4 template in asp.net core Visual Studio 2017. When I update the package to Angular 5, I'm getting an error as described above.</p>
  
  <p>I tried to google the solution, but not able to find the solution. </p>