如何在 Webpack 插件中指定多个加载器? [英] How to specify multiple loaders in Webpack plugin?

问题描述

我的 Webpack 配置包含以下加载器.

模块:{装载机: [{ 测试:/\.js$/, 加载器: "babel", 排除:/node_modules/},{ test:/\.sass$/, loaders: ["style-loader", "css-loader", "sass-loader"], 排除:/node_modules/}]},

然后，我希望将 CSS 提取到一个单独的文件中，并尝试使用 提取文本webpack插件，像这样交替我的配置.

var ExtractTextPlugin = require("extract-text-webpack-plugin");模块: {装载机: [{ 测试:/\.js$/, 加载器: "babel", 排除:/node_modules/},//{ test:/\.sass$/, loaders: ["style-loader", "css-loader", "sass-loader"], exclude:/node_modules/}{测试:/\.sass$/,加载器:ExtractTextPlugin.extract({加载器:[css-loader"，sass-loader"]，fallbackLoader:样式加载器"}),排除:/node_modules/}]},插件:[new ExtractTextPlugin("global.css")],...

然而，它失败了.可能是因为我没有正确指定装载机.如何指定多个加载器(一个用于 SASS，一个用于 CSS)?

<块引用>

未找到模块:错误:无法解析 C:\Source\Poc\TestProj 中的模块[object Object]"
@ ./index.js 7:14-38

我已经检查了 index.js 文件，但我看不出有什么问题.它实际上是空导出，如下所示.对 7:14-38 的引用对我来说毫无意义.文件中没有那么多行，甚至......

从./global.sass"导入CssGlobal；//document.write("香蕉！");导出默认{}

解决方案

ExtractTextPlugin.extract() 的这种语法显然只适用于 webpack2 及更高版本(一个对象作为参数).检查这个问题.

为了让它与webpack1一起工作，语法是:

<块引用><块引用>

ExtractTextPlugin.extract([notExtractLoader], loader, [options])`

notExtractLoader(可选)当未提取 css 时应使用的加载器(即在 allChunks 时在附加块中:假)

loader 用于将资源转换为 css 导出模块的加载器.

来源:https://github.com/webpack/extract-text-webpack-plugin/blob/webpack-1/README.md

因此，一个有效的配置文件将是:

var ExtractTextPlugin = require("extract-text-webpack-plugin");模块.出口 = {/* ... */模块 : {装载机: [{ 测试:/\.js$/, 加载器: "babel", 排除:/node_modules/},{测试:/\.sass$/,排除:/node_modules/，loader: ExtractTextPlugin.extract("style-loader", "css-loader!sass-loader")/* 使用 ExtractTextPlugin.extract(["css","sass"]) 也可以 */}]},插件: [新的 ExtractTextPlugin("styles.css")]}

这将生成一个 styles.css 文件.

My Webpack config contains the following loaders.

module: {
  loaders: [
    { test: /\.js$/, loader: "babel", exclude: /node_modules/ },
    { test: /\.sass$/, loaders: ["style-loader", "css-loader", "sass-loader"], exclude: /node_modules/ }
  ]
},

Then, I wished to pull out the CSS to a separate file and I tried using the extract text webpack plugin, alternating my config like this.

var ExtractTextPlugin = require("extract-text-webpack-plugin");

module: {
  loaders: [
    { test: /\.js$/, loader: "babel", exclude: /node_modules/ },
    // { test: /\.sass$/, loaders: ["style-loader", "css-loader", "sass-loader"], exclude: /node_modules/ }
    {
      test: /\.sass$/,
      loader: ExtractTextPlugin.extract(
        {
          loaders: ["css-loader", "sass-loader"],
          fallbackLoader: "style-loader"
        }
      ),
      exclude: /node_modules/
    }
  ]
},
plugins: [new ExtractTextPlugin("global.css")],...

However, it fails with. Probably due me not specifying the loaders correctly. How can I specify multiple loaders (one for SASS and one for CSS)?

Module not found: Error: Cannot resolve module '[object Object]' in C:\Source\Poc\TestProj
@ ./index.js 7:14-38

I've checked the file index.js but I can't see anything wrong there. It's literally empty export, as shown below. And the reference to 7:14-38 says nothing to me. There aren't that many lines in the file, even...

import CssGlobal from "./global.sass";
//document.write("Banana!");
export default {}

解决方案

This syntax for ExtractTextPlugin.extract() only works in webpack2 and above, apparently (an object as argument). Check this issue.

In order to make it work with webpack1, the syntax is:

ExtractTextPlugin.extract([notExtractLoader], loader, [options])`

notExtractLoader (optional) the loader(s) that should be used when the css is not extracted (i.e. in an additional chunk when allChunks: false)

loader the loader(s) that should be used for converting the resource to a css exporting module.

Source: https://github.com/webpack/extract-text-webpack-plugin/blob/webpack-1/README.md

So, a working config file would be:

var ExtractTextPlugin = require("extract-text-webpack-plugin");

module.exports = {
    /* ... */
    module : {
          loaders: [
            { test: /\.js$/, loader: "babel", exclude: /node_modules/ },
            { 
                test: /\.sass$/, 
                exclude: /node_modules/,
                loader: ExtractTextPlugin.extract("style-loader", "css-loader!sass-loader")
               /* using ExtractTextPlugin.extract(["css","sass"]) works too */

            }
          ]
    },
    plugins: [
        new ExtractTextPlugin("styles.css")
    ]   
}

This will genereate a styles.css file.

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