webpack.shared.js

const production = process.env.NODE_ENV === 'production';
const TerserPlugin = require('terser-webpack-plugin');
const nodeExternals = require('webpack-node-externals');
const path = require('path');

module.exports = (directory) => {
	return {
		entry: path.join(directory, './dist/index.js'),
		output: {
			filename: 'index.umd.js',
			path: path.join(directory, 'dist'),
			libraryTarget: 'umd'
		},
		externals: [
			nodeExternals({ modulesDir: path.join(directory, 'node_modules') }),
			nodeExternals({ modulesDir: path.join(__dirname, 'node_modules') })
		],
		module: {
			rules: [
				{
					enforce: 'pre',
					test: /\.js$/,
					loader: 'source-map-loader'
				}
			]
		},
		resolve: {
			extensions: ['.tsx', '.ts', '.js']
		},
		devtool: production ? 'source-map' : 'cheap-module-source-map',
		mode: production ? 'production' : 'development',
		optimization: {
			minimizer: [new TerserPlugin()]
		}
	};
};