Webpack:node_modules/css/index.js没有返回函数

Question

我是第一次尝试webpack并使用本教程开始并包含react.js.

完成步骤并安装style和css模块后,我不断收到错误,即css模块没有返回函数.

这是我的index.jsx:

/** @jsx React.DOM */

'use strict';

require('../css/normalize.css');

var React = require('react');
var Hello = require('./Test/Hello');

React.render(<Hello />, document.getElementById('content'));

和我的webpack配置文件:

module.exports = {
    entry: './ui/src/index.jsx',
    output: {
        path: __dirname + '/build-ui',
        filename: 'app.js', //this is the default name, so you can skip it
        //at this directory our bundle file will be available
        //make sure port 8090 is used when launching webpack-dev-server
        publicPath: 'http://localhost:8090/assets'
    },
    module: {
        loaders: [
            {
                //tell webpack to use jsx-loader for all *.jsx files
                test: /\.jsx$/,
                loader: 'jsx-loader?insertPragma=React.DOM&harmony'
            },
            {
                test: /\.css$/,
                loader: "style!css"
            },
            {
                test: /\.scss$/,
                loader: "style!css!sass"
            }
        ]
    },
    externals: {
        //don't bundle the 'react' npm package with our bundle.js
        //but get it from a global 'React' variable
        'react': 'React'
    },
    resolve: {
        extensions: ['', '.js', '.jsx']
    }
};

当webpack尝试捆绑项目时,它总是指出以下错误:

ERROR in Loader /Users/Johannes/Documents/Development/holmes/node_modules/css/index.js didn't return a function
 @ ./ui/src/index.jsx 5:0-31

我不知道该怎么办.有没有人遇到过这个问题？我该如何解决？

编辑:我的目录如下所示:

holmes/
  ui/
    css/
      normalize.css
    src/
      Test/
        Hello.jsx
      index.jsx
    index.html
  package.json
  webpack.config.js

Answer 1

此错误是由css内部模块引起的node_modules.由于您已css在配置中指定了-loader,因此webpack会尝试在内部查找该加载器node_modules并找到另一个css看起来不像加载器的模块(因此出现错误消息).

为避免混淆,您只需将-loader后缀添加到每个加载器即可.省略-loader后缀只是webpack的一个便利功能,但不幸的是,这是你的情况下的错误的罪魁祸首.

    loaders: [
        {
            //tell webpack to use jsx-loader for all *.jsx files
            test: /\.jsx$/,
            loader: 'jsx-loader?insertPragma=React.DOM&harmony'
        },
        {
            test: /\.css$/,
            loader: "style-loader!css-loader"
        },
        {
            test: /\.scss$/,
            loader: "style-loader!css-loader!sass-loader"
        }

更新:从webpack 2开始,您不能再省略-loaderpostfix.我们决定这样做是为了防止这样的错误.

Answer 2

我有类似的问题react-flexbox-grid.就我而言,解决方案是安装css-loader和style-loadernpm模块:

npm install css-loader style-loader --save-dev