如何将CSS文件导入webpack？ [英] How to import CSS files into webpack?

问题描述

根据文档，CSS文件应该只是是 import ed。

According to the documentation, CSS file should just be imported.

我刚开始使用 webpack 并试图导入一个CSS文件，但我收到一条关于模块丢失的消息：

I am just starting with webpack and tried to import a CSS file but I get a message about a module missing:

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 运行：

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' ]
        }]
  }
}

我最初想过（在使用之前 - display-error-details ）这是由于路径结构的某些问题（特别是前向和后向斜杠），但随后将 navbar.css 移动到文件夹的根目录 webpack - 同样的问题。

I initially thought (before using --display-error-details) that this was due to some problems with the path structure (specifically forward vs. backward slashes) but then moved navbar.css into the root of the folder webpack - same issue.

详细错误显示在 nodes_module <中寻找CSS文件/ code>（尽管所有导演都被追捕了ies树）。为什么？ 我应该如何导入相对于 webpack.config位置的 webpack / static / css / myfile.css 中的文件。 js ？

The detailed error shows that the CSS file is sought after in nodes_module (which is hunted down though all the directories tree). Why? How should I then import a file which is in webpack/static/css/myfile.css relative to the location of webpack.config.js?

注意：尝试 require 时存在同样的问题而不是 import

Note: the same issue exists when trying require instead of import

推荐答案

你必须像任何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 ../ 或 ./ 开头），也不是绝对路径（从 / 开始），它被解析为模块。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。

You have to import them like any JavaScript module. That means, when the imported file is neither a relative path (starting with ../ or ./), nor an absolute path (starting with /), it is resolved as a module. By default webpack will look for modules in the node_modules directory (in the current directory and all parent directories). This is the same behaviour that Node.js uses.

在 webpack / entry.js 中导入 webpack / static / css / myfile.css 你必须使用相对路径。

To import webpack/static/css/myfile.css in webpack/entry.js you have to use a relative path.

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

如果您不想使用相对路径，可以更改webpack使用的目录找到一个包含 resolve.modules 或者您可以使用 resolve.alias 。

If you don't want to use a relative path, you can change the directories that webpack uses to find a module with the resolve.modules or you can use resolve.alias.

在您的webpack配置中，您还定义了 module.rules 和 module.loaders 。当webpack看到 module.rules 时，它会完全忽略 module.loaders ，所以你的 babel-loader 将不会被使用。你应该只使用 module.rules 。

In your webpack config you also defined both module.rules and module.loaders. When webpack sees module.rules it ignores module.loaders completely, so your babel-loader wouldn't be used. You should only use module.rules.

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

这篇关于如何将CSS文件导入webpack？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！