Question

背景

我们的Web应用程序遵循基于组件的设计模式，每个组件都包含模板，Sass部分和JavaScript模块，如下所示：-

components/action_button/_action_button.html.erb
                        /_action_button.scss
                        /action_button.js

JavaScript模块import负责组件的Sass部分，并且模板通过Rails呈现。 Webpack配置了许多加载器和插件，以编译样式并将每个输入点的CSS提取（通过mini-css-extract-plugin提取到独立的样式表中，例如：-

home.js => home.js, home.css
search.js => search.js, search.css

根据使用情况将组件import放入入口点（例如，如果“ {home}上存在action_button，则将其呈现在视图中的某个位置，并且import '~/components/action_button/action_button.js';在{{1中被声明}}。

问题

为了改善页面加载体验，我们正在手动home.js将少数几个组件Sass局部输入@import入口点，然后将输出的CSS内联到critical.scss中该文档和完整的样式表是异步加载的。

理想情况下，我们希望动态地执行此操作，而我想到的一种方法是通过<head>语句表示组件的重要性。也许使用自定义加载程序？：-

import

问题在于，我对Webpack加载程序的工作方式一无所知。我本质上希望它保留所有现有规则，但是将提取的CSS从Sass局部import 'critical-loader!~/components/action_button/action_button.js'; ed 内的重定向到import。

有人知道现有的解决方案吗？或者不知道从哪里开始这样的问题？

Answer 1

您可以使用MiniCssExtractPlugin，因此当您在js文件中导入css文件时，webpack将提取到css文件中。下面是我的配置

const path = require("path");
const webpack = require("webpack");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const CompressionPlugin = require("compression-webpack-plugin");
const UglifyJsPlugin = require("uglifyjs-webpack-plugin");
const WebpackShellPlugin = require('webpack-shell-plugin');
const OptimizeCSSAssetsPlugin = require("optimize-css-assets-webpack-plugin");

process.traceDeprecation = true;

module.exports = {
    entry: {
        admin: "./React/js/App/Modules/Admin/admin.js",
        client: "./React/js/App/Modules/Client/client.js",
        login: "./React/js/EntryPoint/Modules/Admin/Account/Login/Login.js",
        password: "./React/js/EntryPoint/Modules/Admin/Account/Password/Password.js",
        manageaccount: "./React/js/EntryPoint/Modules/Admin/Account/Index.js",
        categories: "./React/js/EntryPoint/Modules/Admin/Categories/Categories.js",
        tag: "./React/js/EntryPoint/Modules/Admin/Tag/Tag.js",
        post: "./React/js/EntryPoint/Modules/Admin/Post/Post.js",
        comment: "./React/js/EntryPoint/Modules/Admin/Comment/Comment.js",
        portal: "./React/js/EntryPoint/Modules/Admin/Portal/PortalIndex.js",
        ClientIndex: "./React/js/EntryPoint/Modules/Client/Index/ClientIndex.js",
        adminSettings: "./React/js/EntryPoint/Modules/Admin/Settings/Settings.js",
        socialLinks: "./React/js/EntryPoint/Modules/Shared/SocialLinks.js"
    },
    output: {
        path: path.resolve(__dirname, "wwwroot/dist"),
        filename: "[name].js",
        publicPath: "/dist/"
    },
    optimization: {
        minimizer: [
            new UglifyJsPlugin({
                cache: true,
                parallel: true,
                sourceMap: false,
                extractComments: 'all',
                uglifyOptions: {
                    compress: true,
                    output: null
                }
            }),
            new OptimizeCSSAssetsPlugin({
                cssProcessorOptions: {
                    safe: true,
                    discardComments: {
                        removeAll: true,
                    },
                },
            })
        ]
    },
    plugins: [
        new webpack.ContextReplacementPlugin(/\.\/locale$/, 'empty-module', false, /jsx$/),
        new webpack.LoaderOptionsPlugin({
            options: {}
        }),
        new MiniCssExtractPlugin({
            filename: "[name].css",
            chunkFilename: "[id].css"
        }),
        new webpack.ProvidePlugin({
            $: "jquery",
            jQuery: "jquery",
            Popper: ['popper.js', 'default']
        }),
        new CompressionPlugin({
            test: /\.(js|css)/
        }),
        new UglifyJsPlugin(),
        new WebpackShellPlugin({
            onBuildStart: ['echo "Starting postcss command"'],
            onBuildEnd: ['postcss --dir wwwroot/dist wwwroot/dist/*.css']
        })
    ],
    resolve: {
        modules: [
            path.resolve('./React/js/App'),
            path.resolve('./React/js/App/Modules/Client'),
            path.resolve('./React/js/App/Modules/Adnmin'),
            path.resolve('./node_modules')
        ]
    },
    module: {
        rules: [{
                test: /\.scss$/,
                use: [
                    'style-loader',
                    MiniCssExtractPlugin.loader,
                    {
                        loader: "css-loader",
                        options: {
                            minimize: true,
                            sourceMap: true
                        }
                    },
                    {
                        loader: "sass-loader"
                    }
                ]
            },
            {
                test: /\.(js|jsx)$/,
                exclude: /node_modules/,
                loader: ["babel-loader", "eslint-loader"]
            },
            {
                test: /\.(jpe?g|png|gif)$/i,
                loader: "file-loader"
            },
            {
                test: /\.(woff|ttf|otf|eot|woff2|svg)$/i,
                loader: "file-loader"
            }
        ]
    }
};

如何通过Webpack的import语句将CSS提取到Critical.css样式表中？

背景

问题

1 个答案: