如何在使用 imagemin-webp-webpack-plugin 生成 webp 图片后加载这些图片?

3
我正在配置 imagemin-webp-webpack-plugin,将我的 src/assets/images 中的所有 .png 和 .jpg 图像转换为 dist/assets/images 中的 webp 格式。当我运行构建命令时,转换成功了。所有图像都已转换为 webp 格式并分布到了 dist/assets/images 中。我认为 "这很简单",是时候在我的 src/index.html 文件中创建 <picture> 标签来引用 .webp 图像了:

src/index.html:

<picture>
    <source srcset="assets/images/img-hero-home-attorney.webp" type="image/webp">
    ...
    ... 
</picture>

当我再次运行 npm run build 时,这一次我得到了:
ERROR in ./src/index.html (./node_modules/html-webpack-plugin/lib/loader.js!./src/index.html)
    Module not found: Error: Can't resolve './assets/images/img-hero-home-attorney.webp' in '/Users/**/**/**/**/**/**/src'
     @ ./src/index.html (./node_modules/html-webpack-plugin/lib/loader.js!./src/index.html) 6:33-87

对我来说这是非常合理的。这些图像不存在于 src/assets/images/ 中,因此 Webpack 无法解析这些图像。

现在我遇到了一个障碍:当这些图像只能在imagemin-webp-webpack-plugin处理了 jpg 和 png 后才会存在于 dist/whateverpath 目录中时,我怎样在我的 src/index.html 中引用 .webp 图像呢?

以下是我的配置文件,如果有帮助的话:

webpack.config.js

module.exports = {
    entry: {
        app: [
            './src/index.js'
        ]
    },

    output: {
        path: path.resolve(__dirname, 'dist/'),
        filename: 'assets/js/[name].bundle.js',
    },
    
    devtool: 'source-map',

    plugins: [
        new CleanWebpackPlugin({
            dry: false,
            cleanOnceBeforeBuildPatterns: ['!index.html']
        }),
        new HtmlWebpackPlugin({
            template: './src/index.html',
            filename: './index.html',
            minify: false,
            chunks: ['app']
        }),
        new MiniCssExtractPlugin({
            filename: 'css/[name].css',
            chunkFilename: '[id].css'
        }),
        new HtmlCriticalWebpackPlugin({
            base: 'dist/',
            src: 'index.html',
            dest: 'index.html',
            inline: true,
            minify: true,
            extract: false,
            width: 1351,
            height: 1200,
            penthouse: {
                blockJSRequests: false,
            }
        }),
        new webpack.ProvidePlugin({
            $: "jquery",
            jQuery: "jquery"
        }),
        new ImageminWebpWebpackPlugin({
            config: [{
                test: /\.(jpe?g|png)/,
                options: {
                    quality: 85
                }
            }],
            overrideExtension: true,
            detailedLogs: true,
            silent: true,
            strict: true
        })
    ],

    module: {
        rules: [
            {
                test: /\.js$/,
                exclude: /node_modules/,
                use: {
                    loader: 'babel-loader'
                }
            },
            {
                test: /\.html$/,
                loader: 'html-loader',
                query: {
                    minimize: false
                }
            },
            {
                test: /\.(scss)$/,
                use: [ 
                    {
                        loader: MiniCssExtractPlugin.loader,
                        options: {
                            publicPath: '../'
                        }
                    },
                    {
                        loader: 'css-loader',
                        options: {
                            sourceMap: true,
                        }
                    }, 
                    {
                        loader: 'postcss-loader',
                        options: {
                            sourceMap: true,
                            plugins: function () {
                                return [
                                    require('autoprefixer')
                                ];
                            }
                        }
                    }, 
                    {
                        loader: 'sass-loader',
                        options: {
                            sourceMap: true
                        }
                    }
                ]
            },
            {
                test: /\.(png|svg|jpg|gif|webp)$/,
                use: {
                    loader: 'file-loader',
                    options: {
                        name: 'assets/images/[name].[ext]',
                    }
                }
            },
        ]
    },
    
};
3个回答

0

我也遇到了同样的问题,这真的很令人沮丧,因为它从未得到解决,所以这是我的解决方案。

正如你所说,如果ImageminWebpWebpackPlugin在构建过程中生成了webp图像,则无法在<img>元素中引用它们。和你一样,我的html-loader会因为文件不存在而抛出错误。在我的情况下,我只需添加一个预构建步骤来先将图像转换为webp,而不是在构建过程中使用ImageminWebpWebpackPlugin,而是仅使用imagemin-webp插件。

这是他们github页面上的默认配置 Site

const imagemin = require('imagemin');
const imageminWebp = require('imagemin-webp');
    
(async () => {
    await imagemin(['images/*.{jpg,png}'], {
        destination: 'build/images',
        plugins: [
            imageminWebp({quality: 50})
        ]
    });
    
    console.log('Images optimized');
})();

当然我在Windows 10上运行它时它没有工作,所以问题标签上的另一个用户通过将路径转换为Unix风格来解决了这个问题。

const path = require('path');
const imagemin = require('imagemin');
const imageminWebp = require('imagemin-webp');
    
(async () => {
    const img = await imagemin([path.resolve(__dirname, 'img/*.{jpg,png}').replace(/\\/g, '/')], {
    destination: path.resolve(__dirname, 'dist/webp').replace(/\\/g, '/'),
    plugins: [imageminWebp({ quality: 70 })],
    });
    
    console.log('Images optimized');
    console.log(img);
})();

这里链接到问题页面


0

我有同样的问题。经过两天的努力,我决定在运行时处理...

    import html from './content.html';
    
    const parser = new DOMParser();
    
    /**
      * @param {string} html
      */
    function replaceImgToPicture(html) {
      var dom = parser.parseFromString(html, 'text/html');
      var images = dom.querySelectorAll('img');
      function __setAttribute(source, img, attr, newAttr) {
        var value = img.getAttribute(attr);
        if (value) {
          source.setAttribute(
            newAttr || attr,
            value.replace(/\.(jpe?g|png|gif)/gi, '.webp')
          );
        }
      }
    
      for (var i = 0; i < images.length; i++) {
        var img = images[i];
        if (img.parentElement && img.parentElement.tagName === 'PICTURE') {
          continue;
        }
        var picture = document.createElement('picture');
        var source = document.createElement('source');
        source.setAttribute('type', 'image/webp');
        __setAttribute(source, img, 'sizes');
        __setAttribute(source, img, 'srcset');
        __setAttribute(source, img, 'media');
    
        if (!source.hasAttribute('srcset')) {
          __setAttribute(source, img, 'src', 'srcset');
        }
    
        img.parentElement.insertBefore(picture, img);
        picture.appendChild(source);
        picture.appendChild(img);
      }
    
      return dom.documentElement.outerHTML;
    }

0
你可以使用 filemanager-webpack-plugin 将转换后的图片复制回你的 assets/images 文件夹中 - https://github.com/gregnb/filemanager-webpack-plugin/
const FileManagerPlugin = require('filemanager-webpack-plugin');

plugins: [
    new ImageminWebpWebpackPlugin({
        config: [{
            test: /\.(jpe?g|png)/,
            options: {
                quality: 85
            }
        }],
        overrideExtension: true,
        detailedLogs: true,
        silent: true,
        strict: true
    }),
    new FileManagerPlugin({
      onEnd: {
        copy: [
          {
            source: './dist/**/*.webp',
            destination: './src/assets/images/',
          },
        ],
      },
    }),
  ],
]

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