webpack打包项目报错：You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file.

错误截图：

 

错误原因：根据金山词霸翻译如下：

”您可能需要适当的加载程序来处理此文件类型，当前没有配置加载器来处理此文件“ 大致意思是程序在打包过程中会去webpack.config.js文件中查找相关css加载器，因为找到所以就报错了。

解决方法：

1.下载相关插件 style-loader和css-loader

PS D:\WEB前端\案例\前端工程化：ES6模块化和webpack打包\webpack_study> npm i style-loader css-loader -D
npm WARN webpack-cli@3.3.12 requires a peer of webpack@4.x.x but none is installed. You must install peer dependencies yourself.
npm WARN webpack_study@1.0.0 No description
npm WARN webpack_study@1.0.0 No repository field.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.13 (node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.13: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})

+ css-loader@5.2.6
+ style-loader@3.0.0
added 18 packages from 51 contributors in 3.847s

2.在webpack.config.js文件中加入module对象，对象中包含了rules数组，该数组内是个对象，专门存放各种加载器，

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

test属性值是个正则表达式，\. 表示匹配.号，$表示以css结尾，use属性中存放的就是加载器。

配置完保存重新运行npm run dev打包文件

至此问题解决。