webpack.common.js

const path = require('path')
const HTMLWebpackPlugin = require('html-webpack-plugin')
const CopyWebpackPlugin = require('copy-webpack-plugin')
const DotEnv = require('dotenv-webpack')

module.exports = {
  entry: {
    app: path.resolve(__dirname, 'src/js/app.js'),
  },
  output: {
    path: path.resolve(__dirname, 'build'),
    filename: '[name].js',
    clean: true,
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          {
            loader: 'style-loader',
          },
          {
            loader: 'css-loader',
            options: { sourceMap: true },
          },
          {
            loader: 'postcss-loader',
            options: { sourceMap: true },
          },
        ],
      },
    ],
  },
  plugins: [
    new DotEnv(),
    new HTMLWebpackPlugin({
      filename: 'index.html',
      template: path.resolve(__dirname, 'src/templates/index.html'),
    }),
    new CopyWebpackPlugin({
      patterns: [
        {
          from: path.resolve(__dirname, 'public'),
          to: path.resolve(__dirname, 'build'),
        },
      ],
    }),
  ],
}