webpack+css module usage
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$/,
use: [
'style-loader',
{
loader: 'css-loader',
options: {
modules: true,
localIdentName: '[hash:base64:6]'
}
},
'postcss-loader'
]
}以上代码片段，摘自webpack配置的module.rule。
可以看出wepack在编译过程中，遇到.css结尾的文件，都会交由postcss-loader、css-loader和style-loader依次处理。
因为css-loader开启了css模块功能，所以，所有经过处理的css文件，类名都将被改变。
二、初步改进
使用exclude和include进行区分
1.node_module文件夹内的文件，避免被当前rule处理
{
test: /\.css$/,
use: [
{
loader: 'style-loader'
}，
{
loader: 'css-loader',
options: {
modules: true,
localIdentName: '[hash:base64:6]'
}
},
{
loader: 'postcss-loader'
}
],
exclude:[path.resolve(__dirname, '..', 'node_modules')]
}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')]
}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
*.global.css 普通模式
*.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')]
}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
}
}
]相信看了本文案例你已经掌握了方法，更多精彩请关注php中文网其它相关文章！
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