webpack.config.js

var path = require('path');
var webpack = require('webpack');
var HtmlWebpackPlugin = require('html-webpack-plugin');

module.exports = {
    entry: './src/demo/main.js',
    output: {
        path: path.resolve(__dirname, 'demo'),
        filename: "main.js",
    },

    module: {
        rules: [
            {
                test: /\.vue$/,
                loader: 'vue-loader',
            },
            {
                test: /\.js$/,
                loader: 'babel-loader',
                exclude: /node_modules/,
            },
            {
                test: /\.html$/,
                loader: 'vue-html-loader'
            }
        ]
    },
    devtool: '#eval-source-map',
    plugins: [
        new HtmlWebpackPlugin({
            filename: 'index.html',
            template: 'src/demo/index.html'
        }),
    ]
};

if (process.env.NODE_ENV === 'production') {
    module.exports.output = {
        path: path.resolve(__dirname, 'docs'),
        filename: "main.js",
    };
    module.exports.devtool = '#source-map';
    module.exports.plugins = [
        new HtmlWebpackPlugin({
            filename: 'index.html',
            template: 'src/demo/index.html',
            inject: true,
            minify: {
                removeComments: true,
                collapseWhitespace: true,
                removeAttributeQuotes: true
            },
            chunksSortMode: 'dependency'
        }),
        new webpack.DefinePlugin({
            'process.env': {
                NODE_ENV: '"production"'
            }
        }),

        new webpack.optimize.UglifyJsPlugin({
            compress: {
                warnings: false
            },
        })
    ]
}