Reservair/webpack.config.js

const defaultConfig = require('@wordpress/scripts/config/webpack.config');

const defaultEntry = defaultConfig.entry;

module.exports = {
    ...defaultConfig,
    entry: async () => {
        const entries = typeof defaultEntry === 'function'
            ? await defaultEntry()
            : defaultEntry;
        return {
            ...entries,
            client: './src/client.js',
            admin:  './src/admin.js',
        };
    },
};