woocommerce/plugins/woocommerce-admin/babel.config.js

module.exports = function ( api ) {
	api.cache( true );

	return {
		presets: [ '@wordpress/babel-preset-default' ],
		plugins: [
			/**
			 * This allows arrow functions as class methods so that binding
			 * methods to `this` in the constructor isn't required.
			 */
			'@babel/plugin-proposal-class-properties',
		],
		env: {
			production: {
				plugins: [
					[
						'@wordpress/babel-plugin-makepot',
						{
							output: 'languages/woocommerce-admin.po',
						},
					],
				],
			},
		},
	};
};