title: Unable to run npm start: "this.htmlWebpackPlugin.getHooks is not a function"
body: <p>I'm in a bit of a bind and have a very weak background in web development. Recently, I've had to take over the work of a colleague who left and have been studying web development and learning all of the tools while trying to finish the site we were working on. The project uses webpack and react, and I was trying to add in redux when everything went wrong. I updated webpack and some plugins to the most recent versions to be up to date and function with redux. Upon updating, I have run into problem after problem trying to just npm start. I should note that previously, I had been working on the project (without redux) and had made some changes to the website and had everything functional. Since trying to update, I can't even run a dev sever. I've been researching this problem for a week or so, and trying to learn as much as I can about how all of the start-up files actually function, but have yet to find a solution. Any suggestions?</p>
  
  <p>Here's the exact error: </p>
  
  <pre><code>this.htmlWebpackPlugin.getHooks is not a function
  npm ERR! code ELIFECYCLE
  npm ERR! errno 1
  </code></pre>
  
  <p>I'm not sure if including my webpack config and npm start will help or not, but here they are as well</p>
  
  <p>Here's my webpack.config.dev</p>
  
  <pre><code>    'use strict';
  
  const autoprefixer = require('autoprefixer');
  const path = require('path');
  const webpack = require('webpack');
  const HtmlWebpackPlugin = require('html-webpack-plugin');
  const CaseSensitivePathsPlugin = require('case-sensitive-paths-webpack-plugin');
  const InterpolateHtmlPlugin = require('react-dev-utils/InterpolateHtmlPlugin');
  const WatchMissingNodeModulesPlugin = require('react-dev-utils/WatchMissingNodeModulesPlugin');
  const eslintFormatter = require('react-dev-utils/eslintFormatter');
  const ModuleScopePlugin = require('react-dev-utils/ModuleScopePlugin');
  const getClientEnvironment = require('./env');
  const paths = require('./paths');
  
  // Webpack uses `publicPath` to determine where the app is being served from.
  // In development, we always serve from the root. This makes config easier.
  const publicPath = '/';
  // `publicUrl` is just like `publicPath`, but we will provide it to our app
  // as %PUBLIC_URL% in `index.html` and `process.env.PUBLIC_URL` in JavaScript.
  // Omit trailing slash as %PUBLIC_PATH%/xyz looks better than %PUBLIC_PATH%xyz.
  const publicUrl = '';
  // Get environment variables to inject into our app.
  const env = getClientEnvironment(publicUrl);
  
  // This is the development configuration.
  // It is focused on developer experience and fast rebuilds.
  // The production configuration is different and lives in a separate file.
  module.exports = {
    mode: 'production',
    // You may want 'eval' instead if you prefer to see the compiled output in DevTools.
    // See the discussion in https://github.com/facebookincubator/create-react-app/issues/343.
    devtool: 'cheap-module-source-map',
    // These are the "entry points" to our application.
    // This means they will be the "root" imports that are included in JS bundle.
    // The first two entry points enable "hot" CSS and auto-refreshes for JS.
    entry: [
      // We ship a few polyfills by default:
      require.resolve('./polyfills'),
      // Include an alternative client for WebpackDevServer. A client's job is to
      // connect to WebpackDevServer by a socket and get notified about changes.
      // When you save a file, the client will either apply hot updates (in case
      // of CSS changes), or refresh the page (in case of JS changes). When you
      // make a syntax error, this client will display a syntax error overlay.
      // Note: instead of the default WebpackDevServer client, we use a custom one
      // to bring better experience for Create React App users. You can replace
      // the line below with these two lines if you prefer the stock client:
      // require.resolve('webpack-dev-server/client') + '?/',
      // require.resolve('webpack/hot/dev-server'),
      require.resolve('react-dev-utils/webpackHotDevClient'),
      // Finally, this is your app's code:
      paths.appIndexJs,
      // We include the app code last so that if there is a runtime error during
      // initialization, it doesn't blow up the WebpackDevServer client, and
      // changing JS code would still trigger a refresh.
    ],
    output: {
      // Add /* filename */ comments to generated require()s in the output.
      pathinfo: true,
      // This does not produce a real file. It's just the virtual path that is
      // served by WebpackDevServer in development. This is the JS bundle
      // containing code from all our entry points, and the Webpack runtime.
      filename: 'static/js/bundle.js',
      // There are also additional JS chunk files if you use code splitting.
      chunkFilename: 'static/js/[name].chunk.js',
      // This is the URL that app is served from. We use "/" in development.
      publicPath: publicPath,
      // Point sourcemap entries to original disk location (format as URL on Windows)
      devtoolModuleFilenameTemplate: info =&gt;
        path.resolve(info.absoluteResourcePath).replace(/\\/g, '/'),
    },
    resolve: {
      // This allows you to set a fallback for where Webpack should look for modules.
      // We placed these paths second because we want `node_modules` to "win"
      // if there are any conflicts. This matches Node resolution mechanism.
      // https://github.com/facebookincubator/create-react-app/issues/253
      modules: ['node_modules', paths.appNodeModules].concat(
        // It is guaranteed to exist because we tweak it in `env.js`
        process.env.NODE_PATH.split(path.delimiter).filter(Boolean)
      ),
      // These are the reasonable defaults supported by the Node ecosystem.
      // We also include JSX as a common component filename extension to support
      // some tools, although we do not recommend using it, see:
      // https://github.com/facebookincubator/create-react-app/issues/290
      // `web` extension prefixes have been added for better support
      // for React Native Web.
      extensions: ['.web.js', '.mjs', '.js', '.json', '.web.jsx', '.jsx'],
      alias: {
  
        // Support React Native Web
        // https://www.smashingmagazine.com/2016/08/a-glimpse-into-the-future-with-react-native-for-web/
        'react-native': 'react-native-web',
      },
      plugins: [
        //new HtmlWebpackPlugin(),
        // Prevents users from importing files from outside of src/ (or node_modules/).
        // This often causes confusion because we only process files within src/ with babel.
        // To fix this, we prevent you from importing files out of src/ -- if you'd like to,
        // please link the files into your node_modules/ and let module-resolution kick in.
        // Make sure your source files are compiled, as they will not be processed in any way.
        new ModuleScopePlugin(paths.appSrc, [paths.appPackageJson]),
      ],
    },
    module: {
      strictExportPresence: true,
      rules: [
        // TODO: Disable require.ensure as it's not a standard language feature.
        // We are waiting for https://github.com/facebookincubator/create-react-app/issues/2176.
        // { parser: { requireEnsure: false } },
  
        // First, run the linter.
        // It's important to do this before Babel processes the JS.
        {
          test: /\.(js|jsx|mjs)$/,
          enforce: 'pre',
          use: [
            {
              options: {
                formatter: eslintFormatter,
                eslintPath: require.resolve('eslint'),
  
              },
              loader: require.resolve('eslint-loader'),
            },
          ],
          include: paths.appSrc,
        },
        {
          // "oneOf" will traverse all following loaders until one will
          // match the requirements. When no loader matches it will fall
          // back to the "file" loader at the end of the loader list.
          oneOf: [
            // "url" loader works like "file" loader except that it embeds assets
            // smaller than specified limit in bytes as data URLs to avoid requests.
            // A missing `test` is equivalent to a match.
            {
              test: [/\.bmp$/, /\.gif$/, /\.jpe?g$/, /\.png$/],
              loader: require.resolve('url-loader'),
              options: {
                limit: 10000,
                name: 'static/media/[name].[hash:8].[ext]',
              },
            },
            // Process JS with Babel.
            {
              test: /\.(js|jsx|mjs)$/,
              include: paths.appSrc,
              loader: require.resolve('babel-loader'),
              options: {
  
                // This is a feature of `babel-loader` for webpack (not Babel itself).
                // It enables caching results in ./node_modules/.cache/babel-loader/
                // directory for faster rebuilds.
                cacheDirectory: true,
              },
            },
  
            //scss
            {
              test: /\.scss$/,
              include: paths.appSrc,
              loaders: [require.resolve('style-loader'), require.resolve('css-loader'), require.resolve('sass-loader')]
            },
  
            // "postcss" loader applies autoprefixer to our CSS.
            // "css" loader resolves paths in CSS and adds assets as dependencies.
            // "style" loader turns CSS into JS modules that inject &lt;style&gt; tags.
            // In production, we use a plugin to extract that CSS to a file, but
            // in development "style" loader enables hot editing of CSS.
            {
              test: /\.css$/,
              use: [
                require.resolve('style-loader'),
                {
                  loader: require.resolve('css-loader'),
                  options: {
                    importLoaders: 1,
                  },
                },
                {
                  loader: require.resolve('postcss-loader'),
                  options: {
                    // Necessary for external CSS imports to work
                    // https://github.com/facebookincubator/create-react-app/issues/2677
                    ident: 'postcss',
                    plugins: () =&gt; [
                      require('postcss-flexbugs-fixes'),
                      autoprefixer({
                        browsers: [
                          '&gt;1%',
                          'last 4 versions',
                          'Firefox ESR',
                          'not ie &lt; 9', // React doesn't support IE8 anyway
                        ],
                        flexbox: 'no-2009',
                      }),
                    ],
                  },
                },
              ],
            },
            // "file" loader makes sure those assets get served by WebpackDevServer.
            // When you `import` an asset, you get its (virtual) filename.
            // In production, they would get copied to the `build` folder.
            // This loader doesn't use a "test" so it will catch all modules
            // that fall through the other loaders.
            {
              // Exclude `js` files to keep "css" loader working as it injects
              // its runtime that would otherwise processed through "file" loader.
              // Also exclude `html` and `json` extensions so they get processed
              // by webpacks internal loaders.
              exclude: [/\.sass$/,
                        /\.(js|jsx|mjs)$/,
                        /\.html$/,
                        /\.json$/],
              loader: require.resolve('file-loader'),
              options: {
                name: 'static/media/[name].[hash:8].[ext]',
              },
            },
          ],
        },
        // ** STOP ** Are you adding a new loader?
        // Make sure to add the new loader(s) before the "file" loader.
      ],
    },
    plugins: [
      // Makes some environment variables available in index.html.
      // The public URL is available as %PUBLIC_URL% in index.html, e.g.:
      // &lt;link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico"&gt;
      // In development, this will be an empty string.
  
      // Generates an `index.html` file with the &lt;script&gt; injected.
      new HtmlWebpackPlugin({
        inject: true,
        template: paths.appHtml,
      }),
      new InterpolateHtmlPlugin(env.raw),
      // Add module names to factory functions so they appear in browser profiler.
      new webpack.NamedModulesPlugin(),
      // Makes some environment variables available to the JS code, for example:
      // if (process.env.NODE_ENV === 'development') { ... }. See `./env.js`.
      new webpack.DefinePlugin(env.stringified),
      // This is necessary to emit hot updates (currently CSS only):
      new webpack.HotModuleReplacementPlugin(),
      // Watcher doesn't work well if you mistype casing in a path so we use
      // a plugin that prints an error when you attempt to do this.
      // See https://github.com/facebookincubator/create-react-app/issues/240
      new CaseSensitivePathsPlugin(),
      // If you require a missing module and then `npm install` it, you still have
      // to restart the development server for Webpack to discover it. This plugin
      // makes the discovery automatic so you don't have to restart.
      // See https://github.com/facebookincubator/create-react-app/issues/186
      new WatchMissingNodeModulesPlugin(paths.appNodeModules),
      // Moment.js is an extremely popular library that bundles large locale files
      // by default due to how Webpack interprets its code. This is a practical
      // solution that requires the user to opt into importing specific locales.
      // https://github.com/jmblog/how-to-optimize-momentjs-with-webpack
      // You can remove this if you don't use Moment.js:
      new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/),
    ],
    // Some libraries import Node modules but don't use them in the browser.
    // Tell Webpack to provide empty mocks for them so importing them works.
    node: {
      dgram: 'empty',
      fs: 'empty',
      net: 'empty',
      tls: 'empty',
      child_process: 'empty',
    },
    // Turn off performance hints during development because we don't do any
    // splitting or minification in interest of speed. These warnings become
    // cumbersome.
    performance: {
      hints: false,
    },
  };
  </code></pre>
  
  <p>Here's the start.js</p>
  
  <pre><code>'use strict';
  
  // Do this as the first thing so that any code reading it knows the right env.
  process.env.BABEL_ENV = 'development';
  process.env.NODE_ENV = 'development';
  
  // Makes the script crash on unhandled rejections instead of silently
  // ignoring them. In the future, promise rejections that are not handled will
  // terminate the Node.js process with a non-zero exit code.
  process.on('unhandledRejection', err =&gt; {
    throw err;
  });
  
  // Ensure environment variables are read.
  require('../config/env');
  const fs = require('fs');
  const chalk = require('chalk');
  const webpack = require('webpack');
  const WebpackDevServer = require('webpack-dev-server');
  const clearConsole = require('react-dev-utils/clearConsole');
  const checkRequiredFiles = require('react-dev-utils/checkRequiredFiles');
  const {
    choosePort,
    createCompiler,
    prepareProxy,
    prepareUrls,
  } = require('react-dev-utils/WebpackDevServerUtils');
  const openBrowser = require('react-dev-utils/openBrowser');
  const paths = require('../config/paths');
  const config = require('../config/webpack.config.dev');
  const createDevServerConfig = require('../config/webpackDevServer.config');
  
  const useYarn = fs.existsSync(paths.yarnLockFile);
  const isInteractive = process.stdout.isTTY;
  
  // Warn and crash if required files are missing
  if (!checkRequiredFiles([paths.appHtml, paths.appIndexJs])) {
    process.exit(1);
  }
  
  // Tools like Cloud9 rely on this.
  const DEFAULT_PORT = parseInt(process.env.PORT, 10) || 3000;
  const HOST = process.env.HOST || '0.0.0.0';
  
  if (process.env.HOST) {
    console.log(
      chalk.cyan(
        `Attempting to bind to HOST environment variable: ${chalk.yellow(
          chalk.bold(process.env.HOST)
        )}`
      )
    );
    console.log(
      `If this was unintentional, check that you haven't mistakenly set it in your shell.`
    );
  
    console.log();
  }
  
  // We attempt to use the default port but if it is busy, we offer the user to
  // run on a different port. `choosePort()` Promise resolves to the next free port.
  choosePort(HOST, DEFAULT_PORT)
    .then(port =&gt; {
      if (port == null) {
        // We have not found a port.
        return;
      }
      const protocol = process.env.HTTPS === 'true' ? 'https' : 'http';
      const appName = require(paths.appPackageJson).name;
      const urls = prepareUrls(protocol, HOST, port);
      // Create a webpack compiler that is configured with custom messages.
      const compiler = createCompiler(webpack, config, appName, urls, useYarn);
      // Load proxy config
      const proxySetting = require(paths.appPackageJson).proxy;
      const proxyConfig = prepareProxy(proxySetting, paths.appPublic);
      // Serve webpack assets generated by the compiler over a web sever.
      const serverConfig = createDevServerConfig(
        proxyConfig,
        urls.lanUrlForConfig
      );
      const devServer = new WebpackDevServer(compiler, serverConfig);
      // Launch WebpackDevServer.
      devServer.listen(port, HOST, err =&gt; {
        if (err) {
          return console.log(err);
        }
        if (isInteractive) {
          clearConsole();
        }
        console.log(chalk.cyan('Starting the development server...\n'));
        openBrowser(urls.localUrlForBrowser);
      });
  
      ['SIGINT', 'SIGTERM'].forEach(function(sig) {
        process.on(sig, function() {
          devServer.close();
          process.exit();
        });
      });
    })
    .catch(err =&gt; {
      if (err &amp;&amp; err.message) {
        console.log(err.message);
      }
      process.exit(1);
    });
  </code></pre>
  
  <p>Here's the package.json</p>
  
  <pre><code>{
    "name": "test-site",
    "version": "0.1.0",
    "private": true,
    "dependencies": {
      "@babel/cli": "^7.1.5",
      "@babel/preset-react": "^7.0.0",
      "@fortawesome/fontawesome-svg-core": "^1.2.8",
      "@fortawesome/react-fontawesome": "^0.1.3",
      "ajv": "^6.5.5",
      "ajv-keywords": "^3.2.0",
      "autoprefixer": "7.1.6",
      "babel-eslint": "7.2.3",
      "babel-jest": "20.0.3",
      "babel-plugin-lodash": "^3.3.4",
      "babel-plugin-react-transform": "^3.0.0",
      "babel-preset-react-app": "^3.1.2",
      "babel-runtime": "6.26.0",
      "case-sensitive-paths-webpack-plugin": "2.1.1",
      "chalk": "1.1.3",
      "css-loader": "0.28.7",
      "dotenv": "4.0.0",
      "dotenv-expand": "4.2.0",
      "eslint-config-react-app": "^2.1.0",
      "eslint-plugin-flowtype": "2.39.1",
      "eslint-plugin-import": "2.8.0",
      "eslint-plugin-jsx-a11y": "5.1.1",
      "eslint-plugin-react": "7.4.0",
      "extract-text-webpack-plugin": "3.0.2",
      "fs-extra": "3.0.1",
      "interpolate-html-plugin": "^3.0.0",
      "jest": "20.0.4",
      "jquery": "^3.3.1",
      "nodejs-latest": "^1.1.0",
      "object-assign": "4.1.1",
      "postcss-flexbugs-fixes": "3.2.0",
      "postcss-loader": "2.0.8",
      "promise": "8.0.1",
      "raf": "3.4.0",
      "react": "^16.6.3",
      "react-addons-css-transition-group": "^15.6.2",
      "react-addons-transition-group": "^15.6.2",
      "react-art": "^16.6.0",
      "react-dev-utils": "^6.1.1",
      "react-dom": "^16.6.3",
      "react-native": "^0.57.4",
      "react-native-web": "^0.9.6",
      "react-player": "^1.6.6",
      "react-redux": "^5.1.1",
      "react-reveal": "^1.2.2",
      "react-router": "^4.3.1",
      "react-router-dom": "^4.3.1",
      "react-router-native": "^4.3.0",
      "react-scripts": "^2.1.1",
      "react-scrollable-anchor": "^0.6.1",
      "react-slick": "^0.23.1",
      "react-sticky": "^6.0.3",
      "react-toastify": "^4.3.1",
      "react-transition-group": "^1.2.1",
      "react-unity-webgl": "^7.0.6",
      "redux": "^4.0.1",
      "redux-thunk": "^2.3.0",
      "resolve": "1.6.0",
      "serve": "^10.0.2",
      "slick-carousel": "^1.8.1",
      "style-loader": "0.19.0",
      "sw-precache-webpack-plugin": "^0.11.5",
      "url-loader": "0.6.2",
      "video-react": "^0.13.0",
      "whatwg-fetch": "2.0.3",
      "x": "^0.1.2"
    },
    "scripts": {
      "start": "node scripts/start.js",
      "build": "node scripts/build.js",
      "test": "node scripts/test.js --env=jsdom"
    },
    "babel": {
      "presets": [
        "es2015",
        "@babel/env",
        "@babel/react"
      ],
      "plugins": [
        "@babel/plugin-proposal-class-properties"
      ]
    },
    "devDependencies": {
      "@babel/core": "^7.1.6",
      "@babel/preset-env": "^7.1.6",
      "babel-core": "^6.26.3",
      "babel-loader": "^8.0.4",
      "babel-preset-env": "^1.7.0",
      "babel-preset-react": "^6.24.1",
      "eslint": "^4.10.0",
      "eslint-loader": "^2.1.1",
      "file-loader": "^2.0.0",
      "html-webpack-plugin": "^4.0.0-beta.4",
      "node-sass": "^4.9.3",
      "sass-loader": "^7.1.0",
      "webpack": "^4.25.1",
      "webpack-cli": "^3.1.2",
      "webpack-dev-server": "^3.1.10",
      "webpack-manifest-plugin": "^2.0.4"
    },
    "jest": {
      "collectCoverageFrom": [
        "src/**/*.{js,jsx,mjs}"
      ],
      "setupFiles": [
        "&lt;rootDir&gt;/config/polyfills.js"
      ],
      "testMatch": [
        "&lt;rootDir&gt;/src/**/__tests__/**/*.{js,jsx,mjs}",
        "&lt;rootDir&gt;/src/**/?(*.)(spec|test).{js,jsx,mjs}"
      ],
      "testEnvironment": "node",
      "testURL": "http://localhost",
      "transform": {
        "^.+\\.(js|jsx|mjs)$": "&lt;rootDir&gt;/node_modules/babel-jest",
        "^.+\\.css$": "&lt;rootDir&gt;/config/jest/cssTransform.js",
        "^(?!.*\\.(js|jsx|mjs|css|json)$)": "&lt;rootDir&gt;/config/jest/fileTransform.js"
      },
      "transformIgnorePatterns": [
        "[/\\\\]node_modules[/\\\\].+\\.(js|jsx|mjs)$"
      ],
      "moduleNameMapper": {
        "^react-native$": "react-native-web"
      },
      "moduleFileExtensions": [
        "web.js",
        "js",
        "json",
        "web.jsx",
        "jsx",
        "node",
        "mjs"
      ]
    },
    "eslintConfig": {
      "extends": "react-app",
      "globals": {
        "gamesparks": true
      }
    }
  }
  </code></pre>
  
  <p>Sorry for the mountains of code but any help would be great!</p>