title: "Module not found: Error: Can't resolve 'electron-is-dev'" in electron & typescript & webpack project
body: <p>I'm using Electron and Typescript with webpack.
  And I'm gonna add react.js.</p>
  
  <p>But I typed "npx webpack", I got an error.</p>
  
  <p>It says "electron-is-dev module is not found", but I already installed it.</p>
  
  <pre><code> ERROR in ./src/main/window.ts
      Module not found: Error: Can't resolve 'electron-is-dev' in 'project-path/src/main'
       @ ./src/main/window.ts 2:0-36 12:35-40
       @ ./src/main/app.ts
  </code></pre>
  
  <p>I can't find how to solve this error.</p>
  
  <p>window.ts</p>
  
  <pre><code>import { app, BrowserWindow } from 'electron';
  import isDev from 'electron-is-dev';
  
  (...)
  </code></pre>
  
  <p>webpack.config.js</p>
  
  <pre><code>const path = require('path');
  
  module.exports = [
      {
          target: 'electron-main',
          entry: path.join(__dirname, 'src/main/app.ts'),
          mode: 'development',
          module: {
              rules: [
                  {
                      test: /\.ts$/,
                      include: path.join(__dirname, 'src/main'),
                      use: 'ts-loader',
                      exclude: [
                          /node_modules/,
                          path.join(__dirname, 'src/renderer')
                      ]
                  }
              ]
          },
          output: {
              path: path.join(__dirname, 'build'),
              filename: 'electron.js'
          },
          resolve: {
              extensions: ['.tsx', '.ts', 'js']
          },
          node: {
              __dirname: false
          }
      }
  ];
  </code></pre>
  
  <p>And package.json:</p>
  
  <pre><code>{
      "name": "electron-react-typescript",
      "version": "0.0.1",
      "description": "",
      "main": "build/electron.js",
      "scripts": {
          "test": "echo \"Error: no test specified\" &amp;&amp; exit 1"
      },
      "keywords": [],
      "author": "",
      "license": "ISC",
      "devDependencies": {
          "@types/electron-devtools-installer": "^2.2.0",
          "@types/react": "^16.9.19",
          "@types/react-dom": "^16.9.5",
          "@typescript-eslint/eslint-plugin": "2.x",
          "@typescript-eslint/parser": "2.x",
          "babel-eslint": "10.x",
          "concurrently": "^5.1.0",
          "electron": "^8.0.0",
          "electron-builder": "^22.3.2",
          "eslint": "6.x",
          "eslint-config-prettier": "^6.10.0",
          "eslint-config-react-app": "^5.2.0",
          "eslint-plugin-flowtype": "3.x",
          "eslint-plugin-import": "2.x",
          "eslint-plugin-jsx-a11y": "6.x",
          "eslint-plugin-react": "7.x",
          "eslint-plugin-react-hooks": "1.x",
          "html-webpack-plugin": "^3.2.0",
          "prettier": "^1.19.1",
          "source-map-loader": "^0.2.4",
          "ts-loader": "^6.2.1",
          "typescript": "^3.7.5",
          "webpack": "^4.41.5",
          "webpack-cli": "^3.3.10",
          "webpack-dev-server": "^3.10.3"
      },
      "dependencies": {
          "electron-devtools-installer": "^2.2.4",
          "electron-is-dev": "^1.1.0",
          "react": "^16.12.0",
          "react-dom": "^16.12.0"
      }
  }
  </code></pre>
  
  <p>And I'm using eslint and prettier.</p>