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如何将CSS文件导入webpack?

[英]How to import CSS files into webpack?

根据文档,应该只import CSS 文件。

我刚从webpack开始并尝试导入 CSS 文件,但我收到一条关于缺少模块的消息:

D:\Dropbox\dev\jekyll\blog>webpack --display-error-details
Hash: 0cabc1049cbcbdb8d134
Version: webpack 2.6.1
Time: 74ms
   Asset     Size  Chunks             Chunk Names
build.js  2.84 kB       0  [emitted]  main
   [0] ./webpack/entry.js 47 bytes {0} [built]

ERROR in ./webpack/entry.js
Module not found: Error: Can't resolve 'navbar.css' in 'D:\Dropbox\dev\jekyll\blog\webpack'
resolve 'navbar.css' in 'D:\Dropbox\dev\jekyll\blog\webpack'
  Parsed request is a module
  using description file: D:\Dropbox\dev\jekyll\blog\package.json (relative path: ./webpack)
    Field 'browser' doesn't contain a valid alias configuration
  after using description file: D:\Dropbox\dev\jekyll\blog\package.json (relative path: ./webpack)
    resolve as module
      D:\Dropbox\dev\jekyll\blog\webpack\node_modules doesn't exist or is not a directory
      D:\Dropbox\dev\jekyll\node_modules doesn't exist or is not a directory
      D:\Dropbox\dev\node_modules doesn't exist or is not a directory
      D:\Dropbox\node_modules doesn't exist or is not a directory
      D:\node_modules doesn't exist or is not a directory
      looking for modules in D:\Dropbox\dev\jekyll\blog\node_modules
        using description file: D:\Dropbox\dev\jekyll\blog\package.json (relative path: ./node_modules)
          Field 'browser' doesn't contain a valid alias configuration
        after using description file: D:\Dropbox\dev\jekyll\blog\package.json (relative path: ./node_modules)
          using description file: D:\Dropbox\dev\jekyll\blog\package.json (relative path: ./node_modules/navbar.css)
            as directory
              D:\Dropbox\dev\jekyll\blog\node_modules\navbar.css doesn't exist
            no extension
              Field 'browser' doesn't contain a valid alias configuration
              D:\Dropbox\dev\jekyll\blog\node_modules\navbar.css doesn't exist
            .js
              Field 'browser' doesn't contain a valid alias configuration
              D:\Dropbox\dev\jekyll\blog\node_modules\navbar.css.js doesn't exist
            .json
              Field 'browser' doesn't contain a valid alias configuration
              D:\Dropbox\dev\jekyll\blog\node_modules\navbar.css.json doesn't exist
[D:\Dropbox\dev\jekyll\blog\webpack\node_modules]
[D:\Dropbox\dev\jekyll\node_modules]
[D:\Dropbox\dev\node_modules]
[D:\Dropbox\node_modules]
[D:\node_modules]
[D:\Dropbox\dev\jekyll\blog\node_modules\navbar.css]
[D:\Dropbox\dev\jekyll\blog\node_modules\navbar.css]
[D:\Dropbox\dev\jekyll\blog\node_modules\navbar.css.js]
[D:\Dropbox\dev\jekyll\blog\node_modules\navbar.css.json]
 @ ./webpack/entry.js 1:0-21

webpack针对以下webpack.config.js

const path = require('path');

module.exports = {
  entry: path.join(__dirname, 'webpack/entry.js'),
  output: {
    path: path.join(__dirname, 'dist'),
    filename: 'build.js'
  },
  module: {
    loaders: [
      {
        test: /\.js$/,
        loader: 'babel-loader',
        exclude: /node_modules/
      }
    ],
    rules: [{
            test: /\.css$/,
            use: [ 'style-loader', 'css-loader' ]
        }]
  }
}

我最初认为(在使用--display-error-details之前)这是由于路径结构存在一些问题(特别是正斜杠与反斜杠),但随后将navbar.css移到了文件夹webpack的根目录中 - 同样的问题。

详细错误显示在 nodes_module 中查找nodes_module文件(通过所有目录树查找)。 为什么? 然后我应该如何导入webpack/static/css/myfile.css相对于webpack.config.js位置的文件?

注意:尝试require而不是import时存在同样的问题

您必须像任何JavaScript模块一样导入它们。 这意味着,当导入的文件既不是相对路径(以.././开头),也不是绝对路径(以/开头)时,它将被解析为模块。 默认情况下,webpack将在node_modules目录中查找模块(在当前目录和所有父目录中)。 这与Node.js使用的行为相同。

要在webpack/entry.js导入webpack/static/css/myfile.css ,您必须使用相对路径。

import './static/css/myfile.css';

如果你不想使用相对路径,您可以更改的WebPack用于查找与一个模块的目录resolve.modules也可以使用resolve.alias


在您的webpack配置中,您还定义了module.rulesmodule.loaders 当webpack看到module.rulesmodule.loaders完全忽略module.loaders ,因此不会使用你的babel-loader 你应该只使用module.rules

module: {
  rules: [
    {
      test: /\.js$/,
      loader: 'babel-loader',
      exclude: /node_modules/
    },
    {
      test: /\.css$/,
      use: ['style-loader', 'css-loader']
    }
  ]
}

因为某些原因; 对我没有任何作用,所以我将css文件添加到我的entry列表中:

// webpack.config.js
module.exports = {
  // ...
  entry: ["./src/style.css", "./src/index.js"]
  // ...
}

@Aakash 尝试将 sideEffects: true 添加到 css-loader 规则,如下所示:

test: /\.css$/
sideEffects: true,
use: [...]

看起来 webpack 将项目 css 文件视为无效代码。 在 cra config 找到了这个解决方法。

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