const path = require('path')
const { CleanWebpackPlugin } = require('clean-webpack-plugin')
const HTMLWebpackPlugin = require('html-webpack-plugin')
const CopyPlugin = require('copy-webpack-plugin')
const MiniCssExtractPlugin = require('mini-css-extract-plugin')
const isProd = process.env.NODE_ENV === 'production'
const isDev = !isProd


const fileName = ext => isDev ? `bundle.${ext}` : `bundle.${ext}`

module.exports = {
    context: path.resolve(__dirname, 'src'),
    mode: 'development',
    entry: ['@babel/polyfill', './index.js',],
    output: {
        filename: fileName('js'),
        path: path.resolve(__dirname, 'dist')
    },
    resolve: {
        extensions: ['.js'],
        alias: {
            '@': path.resolve(__dirname, 'src'),
            "@core": path.resolve(__dirname, 'src/core')
        }
    },
    devtool: isDev ? 'source-map' : false,
    devServer: {
        contentBase: path.join(__dirname, 'dist'),
        compress: true,
        port: 3000,
        hot: isDev
    },
    plugins: [
        new CleanWebpackPlugin(),
        new HTMLWebpackPlugin({
            template: 'index.html',
            minify: {
                removeComments: isProd,
                collapseWhitespace: isProd
            }
        }),
        new CopyPlugin({
            patterns: [
                {
                    context: path.resolve(__dirname, 'src'),
                    from: path.resolve(__dirname, 'src/favicon.ico'),
                    to: path.resolve(__dirname, 'dist')
                }
            ]
        }),
        new MiniCssExtractPlugin({
            filename: fileName('css')
        })
    ],
    module: {
        rules: [
            {
                test: /\.s[ac]ss$/i,
                use: [
                    MiniCssExtractPlugin.loader,
                    'css-loader',
                    'sass-loader',
                ],
            },
            {
                test: /\.m?js$/,
                exclude: /node_modules/,
                use: {
                    loader: "babel-loader",
                    options: {
                        presets: ['@babel/preset-env']
                    }
                }
            },
        ],
    }
}