Edit file File name : webpack.config.js Content :const defaultConfig = require("@wordpress/scripts/config/webpack.config"); const path = require('path'); module.exports = { ...defaultConfig, entry: { 'block-tenwebspeedoptimizer-sidebarpluginblock': './assets/js/sidebar-plugin.js' }, output: { path: path.join(__dirname, './assets/js/gutenberg'), filename: 'sidebar-plugin-compiled.js' }, } Save