webpack.common.js

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

module.exports = {
    entry: './src/app.js',
    output: {
        filename: 'bundle.js',
        path: path.resolve(__dirname, 'dist')
    },
    devServer: {
        static: path.resolve(__dirname, 'dist'),
        port: 8080,
        hot: true,
        client: {
            overlay: {
                errors: true,
                warnings: false,
            },
        }
    },
    module: {
        rules: [
            {
                test: /\.(css|scss)$/,
                use: [
                    {
                        loader: 'style-loader'
                    },
                    {
                        loader: 'css-loader'
                    },
                    {
                        loader: 'postcss-loader',
                        options: {
                            postcssOptions: {
                                plugins: () => [
                                    require('autoprefixer')
                                ]
                            }
                        }
                    },
                    {
                        loader: 'sass-loader'
                    }
                ]
            },
            {
                test: /\.(png|jpe?g|gif)$/i,
                use: [
                    {
                        loader: 'file-loader',
                    },
                ],
            },
        ]
    },
    plugins: [
        new HtmlWebpackPlugin({
            template: './src/template.html',
            filename: 'index.html'
        })
    ]
}