在imagemin-webp-webpack插件生成webp图像后，我如何加载这些图像

Question

我正在配置imagemin-webp-webpack插件，以便将src/assets/images中的所有.png和.jpg图像转换为dist/assets/images。当我运行build命令时，转换成功了。所有图像都已转换为webp并分发到dist/assets/images。我想"；这很简单"；是时候在我的src/index.html文件中创建<picture>标签来开始引用了

src/index.html:

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

当我再次npm run build时，这次我得到了：

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

这对我来说很有意义。src/assets/images/中不存在这些图像，因此Webpack无法解决这些问题。

所以现在我遇到了一个障碍：当imagemin-webp-webpack-plugin处理jpg和png后，这些图像只存在于dist/whateverpath上时，我如何在我的src/index.html中引用.web图像？

这是我的配置文件，以防有帮助：

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]',
}
}
},
]
},

};

Answer 1

您可以使用filemanager-webpack-plugin将转换后的图像复制回assets/images文件夹-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/',
},
],
},
}),
],
]

Answer 2

我也遇到了同样的问题，它从未得到解决，这很令人沮丧，所以这是我的解决方案。

正如您所说，如果webp图像仅由ImageminWebpWebpackPlugin在构建过程中生成，则无法在元素中引用它们。和你一样，我的html加载程序抛出错误，因为文件不存在。在我的案例中，我只是添加了一个预构建步骤，先将图像转换为webp，在构建过程中不使用ImageminWebpWebpackPlugin，而是单独使用imagemin-web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上运行了这个，但它不起作用，所以问题选项卡上的另一个用户通过将路径转换为unix样式来解决这个问题。

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);
})();

此处的问题页面链接

Answer 3

我也有同样的问题。经过两天的挣扎，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;
}