问webpack不工作的少装载机

EN

var webpack = require('webpack');
var ExtractTextPlugin = require('extract-text-webpack-plugin');
var HtmlWebpackPlugin = require('html-webpack-plugin');

module.exports = {
    entry: {
        'app': './src/scripts/app'
    },
    output: {
        path: './dist',
        filename: `/app.js`,
        chunkFilename: "[id].js"
    },
    resolve: {
        modulesDirectories: ['bower_components', 'node_modules', './src'],
        fallback: ['./public']
    },
    module: {
        loaders: [
            {
                test: /\.less$/,
                loader: ExtractTextPlugin.extract(
                    'css?sourceMap!' +
                    'less?sourceMap'
                )
            }
        ]
    },
    plugins: [
        new ExtractTextPlugin(`[name].css`, {
            allChunks: true
        }),
        new HtmlWebpackPlugin({
            template: './src/index.html'
        })
    ]
};

src
 |-index.html
 |--scripts
 | |-app.js
 |--styles
 | |-app.less