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"require is not defined" 使用webpack 2

javascriptwebpackbabeljs
11

我在使用Webpack打包我的应用时遇到了问题，虽然在网站上看到了类似的问题，并尝试了所有建议，但仍然无法确定问题出在哪里。

所有内容都被很好地打包。 但是当我打开浏览器时，会显示以下错误：
Uncaught ReferenceError: require is not defined

webpack-dist.conf.js

const webpack = require('webpack');
const conf = require('./gulp.conf');
const path = require('path');

const HtmlWebpackPlugin = require('html-webpack-plugin');
const FailPlugin = require('webpack-fail-plugin');
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const pkg = require('../package.json');
const autoprefixer = require('autoprefixer');
const nodeExternals = require('webpack-node-externals');

module.exports = {
  module: {
    loaders: [
      {
        test: /\.json$/,
        loaders: [
          'json-loader'
        ]
      },
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loader: 'eslint-loader',
        enforce: 'pre'
      },
      {
        test: /\.(css|scss)$/,
        loaders: ExtractTextPlugin.extract({
          fallback: 'style-loader',
          use: 'css-loader?minimize!sass-loader!postcss-loader'
        })
      },
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loaders: [
          'ng-annotate-loader',
          'babel-loader'
        ]
      },
      {
        test: /\.html$/,
        loaders: [
          'html-loader'
        ]
      }
    ]
  },
  plugins: [
    new webpack.optimize.OccurrenceOrderPlugin(),
    new webpack.NoEmitOnErrorsPlugin(),
    FailPlugin,
    new HtmlWebpackPlugin({
      template: conf.path.src('index.html')
    }),
    new webpack.optimize.UglifyJsPlugin({
      output: {comments: false},
      compress: {unused: true, dead_code: true, warnings: false} // eslint-disable-line camelcase
    }),
    new ExtractTextPlugin('index-[contenthash].css'),
    new webpack.optimize.CommonsChunkPlugin({name: 'vendor'}),
    new webpack.LoaderOptionsPlugin({
      options: {
        postcss: () => [autoprefixer]
      }
    })
  ],
  target: 'node',
  externals: [nodeExternals()],
  output: {
    path: path.join(process.cwd(), conf.paths.dist),
    filename: '[name]-[hash].js'
  },
  entry: {
    app: `./${conf.path.src('index')}`,
    vendor: Object.keys(pkg.dependencies)
  }
};

package.json

{
  "dependencies": {
  "angular": "^1.6.2",
  "angular-ui-router": "1.0.0-beta.3",
  "body-parser": "^1.17.2",
  "cookie-parser": "^1.4.3",
  "debug": "^2.6.8",
  "express": "^4.15.3",
  "morgan": "^1.8.2",
  "pug": "^2.0.0-rc.2"
},
"devDependencies": {
  "@types/angular": "^1.6.6",
  "@types/angular-mocks": "^1.5.9",
  "@types/angular-ui-router": "^1.1.36",
  "@types/jquery": "^2.0.40",
  "angular-mocks": "^1.6.2",
  "autoprefixer": "^6.7.3",
  "babel-core": "^6.23.1",
  "babel-eslint": "^7.1.1",
  "babel-loader": "^6.3.2",
  "babel-plugin-istanbul": "^4.0.0",
  "babel-polyfill": "^6.23.0",
  "babel-preset-es2015": "^6.22.0",
  "babel-preset-es2017": "^6.24.1",
  "bootstrap": "^4.0.0-alpha.6",
  "browser-sync": "^2.18.8",
  "browser-sync-spa": "^1.0.3",
  "css-loader": "^0.26.4",
  "del": "^2.2.2",
  "es6-shim": "^0.35.3",
  "eslint": "^3.15.0",
  "eslint-config-angular": "^0.5.0",
  "eslint-config-xo-space": "^0.15.0",
  "eslint-loader": "^1.6.1",
  "eslint-plugin-angular": "^1.6.1",
  "eslint-plugin-babel": "^4.0.1",
  "extract-text-webpack-plugin": "^2.0.0-rc.3",
  "file-loader": "^0.11.1",
  "font-awesome": "^4.7.0",
  "gulp": "gulpjs/gulp#4ed9a4a3275559c73a396eff7e1fde3824951ebb",
  "gulp-angular-filesort": "^1.1.1",
  "gulp-angular-templatecache": "^2.0.0",
  "gulp-filter": "^5.0.0",
  "gulp-htmlmin": "^3.0.0",
  "gulp-hub": "frankwallis/gulp-hub#d461b9c700df9010d0a8694e4af1fb96d9f38bf4",
  "gulp-insert": "^0.5.0",
  "gulp-ng-annotate": "^2.0.0",
  "gulp-sass": "^3.1.0",
  "gulp-util": "^3.0.8",
  "html-loader": "^0.4.4",
  "html-webpack-plugin": "^2.28.0",
  "jasmine": "^2.5.3",
  "jquery": "^3.2.1",
  "json-loader": "^0.5.4",
  "karma": "^1.4.1",
  "karma-angular-filesort": "^1.0.2",
  "karma-coverage": "^1.1.1",
  "karma-jasmine": "^1.1.0",
  "karma-junit-reporter": "^1.2.0",
  "karma-ng-html2js-preprocessor": "^1.0.0",
  "karma-phantomjs-launcher": "^1.0.2",
  "karma-phantomjs-shim": "^1.4.0",
  "karma-webpack": "^2.0.2",
  "mdbootstrap": "^4.3.2",
  "ng-annotate-loader": "^0.2.0",
  "node-sass": "^4.5.0",
  "phantomjs-prebuilt": "^2.1.14",
  "postcss-loader": "^1.3.1",
  "sass-loader": "^6.0.1",
  "style-loader": "^0.13.1",
  "tether": "^1.4.0",
  "url-loader": "^0.5.8",
  "webpack": "^2.2.1",
  "webpack-fail-plugin": "^1.0.5",
  "webpack-node-externals": "^1.6.0"
},
"scripts": {
"start": "node app.js",
"build": "gulp",
"serve": "gulp serve",
"serve:dist": "gulp serve:dist",
"test": "gulp test",
"test:auto": "gulp test:auto"
},
"eslintConfig": {
"globals": {
  "expect": true
},
"root": true,
"env": {
  "browser": true,
  "jasmine": true
},
"parser": "babel-eslint",
"extends": [
  "xo-space/esnext"
  ]
}
}

如果有人能帮忙，我将不胜感激。

3个回答
19
您正在使用错误的目标链接：target。
target: 'node'

这意味着该捆绑包旨在用于Node.js（服务器端）程序，而不是浏览器。您可以将其更改为 web，或者只需删除该行（因为 web 是默认设置）。

2
问题仍然存在。 - Cesar Jr Rodriguez
7
如果目标是浏览器，就不应该使用webpack-node-externals。它会将依赖项转换为单个require调用。在 target: 'node' 后面删除下一行代码。 - Evan Sebastian
1
target 应该设置为 web，而 externals 应该保持为空，除非您正在使用未被捆绑的库，例如来自 CDN 的 jQuery 等。 - Stijn de Witt
2
@StijndeWitt 如果你正在使用被捆绑的库，该怎么办？ - Kendall
问题已经解决了！非常感谢。 - Joseph Hajjar
15

需要更改一些配置:

target: 'web', // 默认是这个 // externals: [nodeExternals()]，移除它会导致问题

2
如果您删除它，那么您将如何添加所需的模块？ - Kendall
1
Webpack将在您的捆绑包中包含模块代码。因此，只需像往常一样使用require('some-lib')，您就会看到some-lib的源代码被提取出来并添加到您的bundle.js中。 - Stijn de Witt
6

在使用node + express构建后端和客户端使用的托管小部件时遇到了这个问题。我的webpack配置分为两部分，一部分用于后端，一部分用于前端。

const webpack = require('webpack');
const path = require('path');
const nodeExternals = require('webpack-node-externals');

const config = {
  // set to false because __dirname resolving to / instead of absolute path when
  // built using webpack
  node: {
    __dirname: false
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['es2015']
          }
        }
      }
    ]
  },
  // set to development to read .env.local variables
  mode: 'development'
};

const serverConfig = Object.assign({}, config, {
  // set target to node to fix build warnings
  target: 'node',
  name: 'server',
  entry: __dirname + '/src/index.js',
  output: {
    path: path.resolve(__dirname + '/dist'),
    filename: 'index.js'
  },
  // webpack-node-externals package used to exclude other packages like express
  // in the final bundle.js
  externals: [nodeExternals()]
});

// widget.js file served from dist/widget
const widgetConfig = Object.assign({}, config, {
  // set target to web for use in browsers
  target: 'web',
  name: 'widget',
  entry: __dirname + '/widget/index.js',
  output: {
    path: path.resolve(__dirname + '/dist/widget/js'),
    filename: 'widget.js'
  }
});

module.exports = [widgetConfig, serverConfig];
1
你救了我的一天！最终在你的提示下创建了一个完全功能的服务器和客户端渲染的网页。 - pczern
网页内容由stack overflow 提供, 点击上面的
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