Webpack 3：使用 sass-loader 和 ExtractTextPlugin 不起作用

Question

我一直在尝试在 webpack 中使用 sass-loader 并且我按照此说明进行操作 -> https://github.com/webpack-contrib/extract-text-webpack-plugin#extracting-sass-or-less 但这不起作用。

有人可以帮我吗？

存储库

https://github.com/gpincheiraa/boolean-html-js-exercises/tree/dev

错误

ERROR in   Error: Child compilation failed:
  Module build failed: Error: "extract-text-webpack-plugin" loader is used without the corresponding plugin, refer to https://github.com/webpack/extract-text-webpack-plugin for the usage example

  - Error: "extract-text-webpack-plugin" loader is used without the corresponding plugin, refer to https://github.com/webpack/extract-text-webpack-plugin for the usage example

依赖项

node v6.11.1
npm 5.3.0

├── babel-cli@6.26.0
├── babel-loader@7.1.2
├── babel-plugin-transform-class-properties@6.24.1
├── babel-polyfill@6.26.0
├── babel-preset-es2015@6.24.1
├── babel-preset-stage-3@6.24.1
├── css-loader@0.28.7
├── extract-text-webpack-plugin@3.0.0
├── html-loader@0.5.1
├── html-webpack-plugin@2.30.1
├── markdown-loader@2.0.1
├── node-sass@4.5.3
├── sass-loader@6.0.6
├── style-loader@0.18.2
├── webpack@3.5.6
└── webpack-dev-server@2.7.1

webpack.config.js

const HtmlWebpackPlugin = require('html-webpack-plugin');
const ExtractTextPlugin = require('extract-text-webpack-plugin');

module.exports = {
    entry: [
      "./index.js"
    ],
    output: {
        path: __dirname + "/dist",
        filename: "index.bundle.js"
    },
    module: {
        rules: [
            { test: /\.js$/, exclude: /node_modules/, loader: "babel-loader" },
            { test: /\.md$/, loaders: [ "html-loader", "markdown-loader" ] },
            { test: /\.scss$/,
              use: ExtractTextPlugin.extract({
                  fallback: 'style-loader',
                  use: ['css-loader', 'sass-loader']
              })
            }
        ]
    },
    plugins: [
        new ExtractTextPlugin('style.css'),
        new HtmlWebpackPlugin({
          template: 'index.html',
          inject: 'body'
        })
    ],
    devtool: "eval-source-map",
    devServer: {
        filename: "index.bundle.js",
        contentBase: "./",
        port: 3000,
        publicPath: "/",
        stats: {
            colors: true
        }
    }
};

Answer 1

问题来自 commented style code in your index.html. The index.html is processed by the html-webpack-plugin and for some reason it still tries to process the require calls (line 9 and line 11)。原因可能是 html-webpack-plugin.

的自定义 EJS 加载器

最简单的解决方案是完全删除 index.html 中的注释代码。

通过导入 .scss 文件，您配置的规则将应用于它。但似乎实际的 extract-text-webpack-plugin 实例在该过程中不可用。您在这些 require 调用中使用了内联加载程序，但您配置的规则仍将应用于该加载程序。为了防止应用其他加载器，您可以在导入前加上 !.

来自webpack documentation - Rule.enforce:

All normal loaders can be omitted (overridden) by prefixing ! in the request.

All normal and pre loaders can be omitted (overridden) by prefixing -! in the request.

All normal, post and pre loaders can be omitted (overridden) by prefixing !! in the request.

为了能够在 HTML 中正确使用 CSS，您还需要在 sass-loader 之后使用 css-loader，因为 EJS 需要 JavaScript在这个地方，不是裸CSS。要求将变为：

<%= require("!css-loader!sass-loader!\./sass/index.scss") %>

最好在您的实际应用程序中导入 index.scss 而不是 html-webpack-plugin 使用的模板。

Answer 2

我来这里是因为我使用 Webpack 3 + Sass + React 的配置也不起作用。

但是，就我而言，问题非常愚蠢。我必须说我使用 create-react-app 工具创建了项目，它设置了一个 webpack.config.dev.js 文件，其中包含一个安静的 complex/complete 配置。

问题是我添加了 sass 规则 AFTER exclude 并且它在评论中清楚地表明（哈哈）每个装载机之后一个就不行了。

所以它现在看起来像这样并且有效：

      {
        test: /\.scss$/,
        use: ExtractTextPlugin.extract({
          fallback: 'style-loader',
          use: [require.resolve('css-loader'), require.resolve('sass-loader')],
        })
      },
      {
        exclude: [/\.js$/, /\.html$/, /\.json$/],
        loader: require.resolve('file-loader'),
        options: {
          name: 'static/media/[name].[hash:8].[ext]',
        },
      },

希望这对以后的人有所帮助。

Webpack 3：使用 sass-loader 和 ExtractTextPlugin 不起作用

Webpack 3: Use sass-loader and ExtractTextPlugin doesn't work

webpack

sass

sass-loader

extract-text-plugin