webpack.config.js

// Generated using webpack-cli https://github.com/webpack/webpack-cli

const path = require('path');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const CopyPlugin = require("copy-webpack-plugin");

const isProduction = process.env.NODE_ENV == 'production';


const stylesHandler = MiniCssExtractPlugin.loader;

const config = {
    entry: {
        'jankx-gutenberg': './blocks/index.js',
    },
    output: {
        path: path.resolve(__dirname, 'build'),
        filename: '[name].js'
    },
    plugins: [
        new MiniCssExtractPlugin(),
        new CopyPlugin({
            patterns: [
                {
                    from: 'blocks/*/block.json',
                    to({ context, absoluteFilename }) {
                        const splitFileNames = absoluteFilename.split("/");
                        return splitFileNames[splitFileNames.length - 2] + '/block.json';
                    },
                }
            ]
          }),

        // Add your plugins here
        // Learn more about plugins from https://webpack.js.org/configuration/plugins/
    ],
    module: {
        rules: [
            {
                test: /\.(js|jsx)$/i,
                loader: 'babel-loader',
            },
            {
                test: /\.css$/i,
                use: [stylesHandler,'css-loader'],
            },
            {
                test: /\.s[ac]ss$/i,
                use: [stylesHandler, 'css-loader', 'sass-loader'],
            },
            {
                test: /\.(eot|svg|ttf|woff|woff2|png|jpg|gif)$/i,
                type: 'asset',
            },

            // Add your rules for custom modules here
            // Learn more about loaders from https://webpack.js.org/loaders/
        ],
    },
    externals: {
        '@wordpress/blocks': 'wp.blocks',
        '@wordpress/block-editor': 'wp.blockEditor',
        'react': 'React',
        'react-dom': 'react-dom'
    }
};

module.exports = () => {
    if (isProduction) {
        config.mode = 'production';


    } else {
        config.mode = 'development';
    }
    return config;
};