Edit file File name : webpack.config.js Content :const path = require( 'path' ); const jetpackWebpackConfig = require( '@automattic/jetpack-webpack-config/webpack' ); module.exports = [ { devtool: jetpackWebpackConfig.devtool, entry: { editor: './src/js/editor.js', }, externals: { ...jetpackWebpackConfig.externals, jetpackConfig: JSON.stringify( { consumer_slug: 'jetpack-blaze', } ), }, mode: jetpackWebpackConfig.mode, node: false, module: { strictExportPresence: true, rules: [ // Transpile JavaScript. jetpackWebpackConfig.TranspileRule( { exclude: /node_modules\//, } ), // Transpile @automattic/jetpack-* in node_modules too. jetpackWebpackConfig.TranspileRule( { includeNodeModules: [ '@automattic/jetpack-' ], } ), // Handle CSS. jetpackWebpackConfig.CssRule( { extensions: [ 'css', 'sass', 'scss' ], extraLoaders: [ 'sass-loader' ], } ), // Handle images. jetpackWebpackConfig.FileRule(), ], }, output: { ...jetpackWebpackConfig.output, path: path.join( __dirname, './build' ), }, optimization: { ...jetpackWebpackConfig.optimization, }, plugins: [ ...jetpackWebpackConfig.StandardPlugins() ], resolve: { ...jetpackWebpackConfig.resolve, }, }, ]; Save