webpack.dev.js

const merge = require('webpack-merge');
const common = require('./webpack.common.js');
const webpack = require('webpack');

module.exports = merge(common, {
    mode: 'development',
    devtool: 'inline-source-map',
    devServer: {
        contentBase: './dist',
        port: 9080,
        hot: true
    },
    plugins:[
        new webpack.NamedModulesPlugin(),
        new webpack.HotModuleReplacementPlugin()
    ],
    module: {
        rules: [
            {
                test: /\.css$/,
                use: [
                    'style-loader',
                    {
                        loader: 'css-loader',
                        options: {
                            importLoaders: 1
                        }
                    },
                    'postcss-loader'
                ]
            },
            {
                test: /\.less$/,
                use: [
                    'style-loader',
                    {
                        loader: 'css-loader',
                        options: {
                            importLoaders: 1
                        }
                    },
                    'postcss-loader',
                    'less-loader'
                ]
            }
        ]
    }
});