webpack如何压缩图片,请写一下配置

Webpack可以使用插件来压缩图片，最常用的插件是`image-webpack-loader`和`imagemin-webpack-plugin`。下面是一个简单的示例配置：

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');
const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
const ImageminPlugin = require('imagemin-webpack-plugin').default;

module.exports = {
  mode: 'production',
  entry: './src/index.js',
  output: {
    filename: 'bundle.[contenthash].js',
    path: path.resolve(__dirname, 'dist')
  },
  optimization: {
    minimizer: [
      new OptimizeCSSAssetsPlugin(),
      new UglifyJsPlugin()
    ]
  },
  module: {
    rules: [
      {
        test: /\.(png|jpg|jpeg|gif|svg)$/i,
        use: [
          'file-loader',
          {
            loader: 'image-webpack-loader',
            options: {
              mozjpeg: {
                progressive: true,
                quality: 65
              },
              optipng: {
                enabled: false,
              },
              pngquant: {
                quality: '65-90',
                speed: 4
              },
              gifsicle: {
                interlaced: false,
              },
              webp: {
                quality: 75
              }
            },
          },
        ],
      },
      {
        test: /\.css$/,
        use: [
          MiniCssExtractPlugin.loader,
          'css-loader'
        ]
      }
    ]
  },
  plugins: [
    new CleanWebpackPlugin(),
    new HtmlWebpackPlugin({
      template: './src/index.html'
    }),
    new MiniCssExtractPlugin({
      filename: '[name].[contenthash].css',
    }),
    new ImageminPlugin({
      pngquant: {
        quality: '65-90'
      }
    })
  ]
};

其中，`image-webpack-loader`在处理图片文件时使用了一些其他优化工具（如`mozjpeg`、`pngquant`、`gifsicle`等），而`imagemin-webpack-plugin`则可以对压缩后的图片再进行一些优化。这样配置后，Webpack在打包时会自动将图片文件进行压缩和优化。