Spookie/webpack.config.js

const Encore = require('@symfony/webpack-encore')
const path = require('path')
//const ManifestPlugin = require('webpack-manifest-plugin')

if (!Encore.isRuntimeEnvironmentConfigured()) {
	Encore.configureRuntimeEnvironment(process.env.NODE_ENV || 'dev')
}

Encore
	.setOutputPath('public/build/')
	.setPublicPath('/build')
	.copyFiles({
		from: './assets/images',
		to: 'images/[path][name].[ext]'
	})
	.addEntry('app', './assets/js/index.js')
	.splitEntryChunks()
	// will require an extra script tag for runtime.js
	// but, you probably want this, unless you're building a single-page app
	.enableSingleRuntimeChunk()
	.cleanupOutputBeforeBuild()
	.enableBuildNotifications()
	.enableSourceMaps(!Encore.isProduction())
	.enableVersioning(Encore.isProduction())
	.configureBabel((config) => {
		config.plugins.push('@babel/plugin-proposal-class-properties')
	})
	// enables @babel/preset-env polyfills
	.configureBabelPresetEnv((config) => {
		config.useBuiltIns = 'usage'
		config.corejs = 3
	})
	.addAliases({
		'@': path.resolve(__dirname, 'assets', 'js'),
		styles: path.resolve(__dirname, 'assets', 'styles')
	})
	.enableSassLoader()
	.enableTypeScriptLoader()
	.enablePostCssLoader((options) => {
		options.postcssOptions = {
			// directory where the postcss.config.js file is stored
			path: './postcss.config.js'
		}
	})
	.autoProvidejQuery()

module.exports = Encore.getWebpackConfig()