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webpack+css module usage

Jun 13, 2018 am 11:34 AM
css module webpack

这次给大家带来webpack+css module使用,webpack+css module使用的注意事项有哪些,下面就是实战案例,一起来看一下。

前言

本文讲述css-loader开启css模块功能之后,如何与引用的npm包中样式文件不产生冲突。

比如antd-mobilenpm包的引入。在不做特殊处理的前提下,样式文件将会被转译成css module

一、产生问题的原因

{ 
  test: /\.css$/,
  use: [
    'style-loader',
    {
      loader: 'css-loader',
      options: {
        modules: true,
        localIdentName: '[hash:base64:6]'
      }
    },
    'postcss-loader'
  ] 
}
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以上代码片段,摘自webpack配置的module.rule。

可以看出wepack在编译过程中,遇到.css结尾的文件,都会交由postcss-loader、css-loader和style-loader依次处理。

因为css-loader开启了css模块功能,所以,所有经过处理的css文件,类名都将被改变。

二、初步改进

使用exclude和include进行区分

1.node_module文件夹内的文件,避免被当前rule处理

{ 
  test: /\.css$/,
  use: [
    {
      loader: 'style-loader'
    },
    {
      loader: 'css-loader',
      options: {
        modules: true,
        localIdentName: '[hash:base64:6]'
      }
    },
    {
      loader: 'postcss-loader'
    }
  ],
  exclude:[path.resolve(__dirname, '..', 'node_modules')]
}
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如上所示,将node_module文件夹内的文件,用exclude排除在外,不用当前rule进行处理。

2.单独处理node_module内的css文件

{ 
  test: /\.css$/,
  use: [
    {
      loader: 'style-loader'
    },
    {
      loader: 'css-loader'
    },
    {
      loader: 'postcss-loader'
    }
  ],
  include:[path.resolve(__dirname, '..', 'node_modules')]
}
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三、升级版,支持css module模式和普通模式混用

1.用文件名区分两种模式

  1. *.global.css 普通模式

  2. *.css css module模式

这里统一用 global 关键词进行识别。

2.用正则表达式匹配文件

// css module
{ 
  test: new RegExp(`^(?!.*\\.global).*\\.css`),
  use: [
    {
      loader: 'style-loader'
    },
    {
      loader: 'css-loader',
      options: {
        modules: true,
        localIdentName: '[hash:base64:6]'
      }
    },
    {
      loader: 'postcss-loader'
    }
  ],
  exclude:[path.resolve(__dirname, '..', 'node_modules')]
}
// 普通模式
{ 
  test: new RegExp(`^(.*\\.global).*\\.css`),
  use: [
    {
      loader: 'style-loader'
    },
    {
      loader: 'css-loader',
    },
    {
      loader: 'postcss-loader'
    }
  ],
  exclude:[path.resolve(__dirname, '..', 'node_modules')]
}
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四、其他问题

less在使用css module时,对url的解析存在冲突,可以用resolve-url-loader进行解决,直接上代码:

test: /\.less/,
use: [
  {
    loader: "style-loader"
  },
  {
    loader: "css-loader", 
    options: {
      sourceMap: true,
      importLoaders: 2
    }
  },
  {
    loader: "postcss-loader", 
    options: {
      sourceMap: true
    }
  },
  {
    loader: "resolve-url-loader", 
    options: {
      sourceMap: true
    }
  },
  {
    loader: "less-loader", 
    options: {
      sourceMap: true
    }
  }
]
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