webpack错误中的多数./src/index.js ./dist/bundle.js

Question

在配置中警告尚未设置"模式"选项。将"模式"选项设置为"开发"或"生产"，以实现此环境的默认值。多数./src/index.js ./dist/bundle.js

Answer 1

以下是WebPack的帮助消息，通过在 WebPack 4

中键入webpack --help。

Usage without config file: webpack <entry> [<entry>] --output [-o] <output>

注意： - 输出需要明确指定

---

解决方案：

webpack src/index.js --output dist/bundle.js --mode development

---

，如果您使用的是webpack.config.js：

const path = require('path');
module.exports = {
  mode: 'development',     // set mode option, 'development' or 'production'
  entry: './src/index.js',
  output: {
    path: path.resolve(__dirname,'dist'),
    filename: "bundle.js"
  }
};

Answer 2

我不确定这里的确切问题是什么，但是我也有此警告并通过在 webpack配置文件中设置mode属性来解决它们

package.json

    {
      "name": "my-awesome-project",
      "version": "1.0.0",
      "description": "",
      "main": "index.js",
      "scripts": {
        "build": "NODE_ENV=production webpack",
      },
      ...
      "devDependencies": {
       ...
      },
      "dependencies": {
       ...
      }
    }

webpack.config.js

const path = require('path');
const HtmlWebPackPlugin = require('html-webpack-plugin');
const distDir = path.join(__dirname, 'dist');
const config = {
  mode: 'development',
  entry: ['./src/js/app.js'],
  output: {
    path: distDir,
    filename: 'js/[name].js',
  },
  module: {
    rules: [
      ...
    ]
  },
  plugins: [
    ...
  ],
  devtool: "eval-source-map", // Default development sourcemap
};
// Check if build is running in production mode, then change the sourcemap type
if (process.env.NODE_ENV === 'production') {
  config.devtool = ''; // No sourcemap for production
  config.mode = 'production';
  // Add more configuration for production here like
  // Uglify plugin
  // Offline plugin
  // Etc,
}
module.exports = config;

希望它有帮助。

Answer 3

配置文件中的设置模式有时不起作用。只是添加--mode=development才能正确。

"scripts": {
  "start": "webpack --config webpack.config.js --hot --mode=development",
}